CN113514336A - Biaxial-loading weldment fatigue performance testing device and method - Google Patents
Biaxial-loading weldment fatigue performance testing device and method Download PDFInfo
- Publication number
- CN113514336A CN113514336A CN202110827847.7A CN202110827847A CN113514336A CN 113514336 A CN113514336 A CN 113514336A CN 202110827847 A CN202110827847 A CN 202110827847A CN 113514336 A CN113514336 A CN 113514336A
- Authority
- CN
- China
- Prior art keywords
- fatigue
- sample
- hydraulic
- transverse
- cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0411—Chucks, fixtures, jaws, holders or anvils using pneumatic or hydraulic pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a device and a method for testing fatigue performance of a biaxial-loaded weldment, and belongs to the field of testing of welding mechanical properties. The device is integrally composed of a hydraulic clamping system, a mechanical fastening device, a cylinder loading mechanism and a pulsation fatigue testing machine in a matching mode. Determining the form of the clamping block according to the surface shape and the size of the tested fatigue sample, and loading and simulating the actual transverse stress of the part by using the cylinder loading mechanism according to the actual working condition. A hydraulic clamping system is utilized to fix one transverse end of a sample, a J-shaped clamp and a clamping block are matched to form a mechanical fastening device and are connected with a cylinder piston rod, so that the sample is transversely positioned and loaded, and a fatigue sample in the vertical direction is clamped on a pulsation fatigue testing machine. Has the advantages that: on the basis of the uniaxial loading of the pulsation fatigue testing machine, the transverse constant force is introduced, and the actual stress state of the part is reproduced to the maximum extent. Aiming at the working condition that the large pressure container generates biaxial load stress on the internal pressure acting surface, the device can be used for obtaining more accurate surface weld fatigue data.
Description
Technical Field
The invention relates to the field of welding mechanical property testing, in particular to a device and a method for testing fatigue property of a weldment subjected to double-shaft loading, which are mainly suitable for testing surface weld fatigue caused by double-shaft stress due to internal pressure of a pressure container and the like.
Background
In the coal industry, a hydraulic support is the most main support equipment of a fully mechanized mining face and plays an important role in protecting underground safety, because high-pressure emulsion exists in a cylinder barrel, a hydraulic jack of a support system is under the action of cyclic load in the service process, fatigue cracks are easily generated at weak positions such as surface welding seams, once a fatigue failure phenomenon occurs in use, huge economic loss and personnel injury can be caused, and therefore obtaining fatigue data of the welding seam position which is easy to fail is particularly important. The stress of the hydraulic support under the actual working condition is complex, the welding seam position on the surface of the vertical column jack is under the action of biaxial stress, the stress of the actual working condition is simulated as much as possible, the accurate fatigue life of the equipment is obtained, the important reference function is provided for the prediction and the protection of the safety of the equipment, and the method has practical significance for the fatigue performance research of the structural member.
At present, a theoretical calculation method, a finite element simulation method and a method for achieving the aim of multi-axis testing by changing the structural form of a fatigue sample under a single-axis loading condition are mainly used for the fatigue testing of a workpiece under the double-axis loading condition. The theoretical calculation method is generally suitable for simple calculation of workpiece structures and stress conditions, and because the theoretical calculation usually needs an idealized model and working conditions, the calculation result and the actual conditions of workpieces under complex load conditions generally have larger errors; the finite element simulation method can be suitable for complex structures and multi-axis load stress, the fatigue weak point data obtained by the method are generally relative, but not real data, the result obtained by a fatigue test is real and accurate, and the result of the finite element simulation is often used as a design reference; under the condition of uniaxial loading, the structural form of the fatigue sample is changed, the effect of multiaxial stress can be achieved, corresponding fatigue data can be obtained, but the requirement of actual working conditions can not be met only by changing the structural form of the fatigue sample under the working conditions of large transverse load or complex transverse load, if the structural form and the stress state of an actual workpiece are damaged by processing and changing the fatigue sample to a large extent, the method is suitable for fatigue testing under the condition of small stress.
Disclosure of Invention
The invention aims to provide a device and a method for testing fatigue performance of a weldment loaded in a double shaft, which solve the problems that the fatigue performance of a workpiece under the condition of multi-shaft stress cannot be accurately obtained, the safety reliability and the service life of equipment in service under the actual working condition cannot be accurately estimated and the like in the prior art, and reduce errors caused by obtaining the fatigue performance of the equipment through stress condition theoretical calculation or finite element simulation. The fatigue performance of the required sample is obtained by a more intuitive and accurate test method. The device for providing the transverse constant force is added on the basis of the tension-compression pulsation fatigue testing machine, the device is fixed on a transverse fixed fatigue sample through hydraulic clamping and mechanical fastening, the stable transverse constant force is provided through the cylinder loading mechanism, and the device is integrally matched to keep the sample to be uniformly stressed and not to slip in the testing process. The device is suitable for the working condition that the alternating load is borne in the vertical direction and the load stress with constant magnitude exists in the transverse direction, and is particularly suitable for positions such as welding seams and the like which are complex in load bearing and serious in stress concentration and are easy to fail. The double-shaft-loaded weldment fatigue testing device and method are high in applicability, simple and convenient to operate, accurate in result, based on a pulse fatigue testing machine, and commonly used for obtaining fatigue data of a multi-shaft stress sample in a laboratory.
The above object of the present invention is achieved by the following technical solutions:
biax loaded weldment fatigue performance testing arrangement includes:
a hydraulic clamping system for fixing one transverse end of the fatigue test sample 10;
the cylinder loading mechanism is used for providing a transverse constant force required by the test for the fatigue test sample 10;
the mechanical fastening device is matched with the cylinder piston rod 13 and the fatigue sample 10 and clamps the transverse other end of the fatigue sample 10;
the fatigue test sample 10 is vertically clamped on a chuck 11 of the pulsation fatigue test machine, a control system of the test machine is started and loads a tension-compression pulsation load, and the tension-compression pulsation load is matched with a transverse constant force loaded by the cylinder loading mechanism to jointly act on the fatigue test sample 10 until the fatigue test sample 10 is subjected to fatigue failure, so that corresponding fatigue data are obtained.
The hydraulic clamping system adjusts the flow of high-pressure emulsion through a hydraulic workstation to change the liquid pressure in a cylinder 5 of the hydraulic cylinder, controls a piston rod 6 of the hydraulic cylinder to move, and further drives a link mechanism hydraulic clamp 7 connected with the piston rod to clamp and release; the clamping force of the hydraulic clamp is adjusted according to the shape and the material difference of the fatigue test sample, so that extra damage to the surface of the test sample is avoided in the test process, the accuracy of fatigue data is further influenced, and the effect of fixing one transverse end of the test sample is achieved in the vibration starting process of the fatigue machine.
The hydraulic clamping system is as follows: cylindrical openings are arranged on the hydraulic workstation box body and the hydraulic cylinder barrel 5 to fix the hydraulic liquid through pipe 2, the hydraulic liquid through pipe 2 is connected and filled with high-pressure emulsion, the pressure in the hydraulic cylinder body is controlled to drive the hydraulic cylinder piston rod 6 to move, and the clamping force is adjusted by changing the internal pressure of the hydraulic cylinder barrel 5; an oval through hole is processed in the piston rod 6 of the hydraulic cylinder, one end of the piston rod is a cylindrical head with the diameter larger than the rod diameter, and the piston rod is matched with a connecting rod mechanism hydraulic clamp 7 to fix one transverse end of a fatigue sample; the connecting rod mechanism hydraulic tong 7 is composed of a plurality of oval and dart-shaped connecting rods, pins are placed at the moving joints in a connecting mode, the connecting rods of all parts are driven to move through the movement of the hydraulic piston rods 6, the effect of clamping the fatigue sample 10 is achieved, the freedom degree of the connecting rod mechanism in the clamping direction is large, the connecting rod mechanism can adapt to clamping of objects in different angles and directions, different hydraulic tong heads can be replaced according to the shapes of the clamped objects, and the adaptability is high.
The cylinder loading mechanism takes a cylinder as a main body to output transverse constant force, a cylinder piston rod 13 is connected with a clamping block 8 of the mechanical fastening device through threads, the mechanical fastening device is connected with the cylinder loading mechanism, the air pressure in a cylinder barrel 15 of the cylinder is controlled through an air pump 17, and then the cylinder piston rod 13 is driven to do push-pull movement to output transverse load stress required by a test. According to different working conditions of specific tests, the gas pressure or the diameter of the piston rod of the cylinder is changed to control the output force.
The mechanical fastening device consists of a clamping block 8, a J-shaped clamp 12 and other manual clamps, and aims to fix one transverse end of the fatigue test sample 10 and connect with the cylinder loading mechanism. The whole clamp splice 8 contacts with the cylindrical clamping position in J-shaped clamp bottom, compresses tightly screw thread central depression bar clamp tightly fixedly downwards through rotatory tip swing arm, and clamp splice 8 and cylinder piston rod 13 threaded connection export required horizontal constant force, and mechanical fastening device plays the effect of fixing, connection transition, can not produce relative slip with the clamp splice when making tired sample 10 receive the loaded horizontal constant force of cylinder, and the atress is even.
The transverse clamping end of the fatigue sample 10 is processed into a cross shape, the length of the transverse clamping end corresponds to the size of a welding seam, the welding seam is guaranteed to be always under the action of transverse constant force and is evenly stressed in the test process, and different forms of clamping blocks 8 are selected to be connected with the transverse clamping end of the fatigue sample according to the surface shape and size of the sample.
The fatigue test piece 10 is longitudinally clamped on the pulsation fatigue testing machine, vertical direction load stress is loaded on the fatigue test piece 10 through the control system, the purpose of double-shaft loading is achieved by matching with transverse constant force output by the cylinder loading mechanism, and loading load is changed according to testing requirements.
Based on the fatigue performance design of testing the flying ring buckle welding line on the surface of the cylinder barrel of the high-pressure hydraulic cylinder, due to the effect of internal pressure of high-pressure emulsion in the cylinder body, the welding line on the surface of the cylinder barrel is under the action of axial and tangential biaxial load stress, and in order to meet the actual working condition of a fatigue test, an air cylinder is added on the basis of the original tension and compression pulsation load to provide tangential stress, so that the stress characteristic of the welding line on the surface of an actual pressure container is simulated.
The invention also aims to provide a biaxial loading weldment fatigue performance testing method, which comprises the following steps of:
designing a fatigue sample 10 according to the national standard of a fatigue test, correspondingly extending a transverse clamping end at the position of a welding seam, wherein the size of the transverse clamping end is determined by the physical properties of materials and the required loading force level, acquiring the required fatigue sample from an actual component according to the size of the designed fatigue sample, and determining the form of a clamping block 8 according to the surface shape and size of the transverse clamping end;
polishing each surface of the fatigue sample to meet the requirement of surface roughness of a fatigue test, processing a transition arc in the longitudinal integral area of the transverse clamping end and the fatigue sample, and removing factors influencing a fatigue data result, such as linear cutting traces, a surface oxide layer and the like;
fixing the sample on a chuck 11 of the pulse fatigue testing machine, ensuring the centering property of the sample, determining the clamping force of a hydraulic clamping system according to the property of the tested material and the shape of the sample, matching a clamping block 8 with the sample and fastening the sample through a hydraulic clamp 7 of a link mechanism; determining the diameter of a piston rod of the cylinder and the pressure of the loaded gas according to the transverse constant force required by the actual working condition;
connecting the cylinder loading mechanism with a mechanical fastening device, fixing the fatigue sample 10 under the combined action of the cylinder loading mechanism and a hydraulic clamping system, and outputting a transverse constant force;
and step five, determining the vertical pulsating load and test parameters, starting the testing machine through the control system, and starting the test.
The invention has the beneficial effects that: different from the traditional uniaxial pulsation fatigue test, the stress of the actual working condition of the part is generally complex, the complex stress condition is generally difficult to estimate and predict, and the stress condition is often corresponding to severe fatigue failure. For the biaxial stress condition of the high-pressure oil pipe, the biaxial loading weldment fatigue testing device can better simulate the actual working condition to obtain the data close to the real fatigue life, and has great benefit for predicting and preventing the harm caused by fatigue failure. The fatigue data model of theoretical calculation and finite element simulation prediction theoretically determines that the fatigue life of a part has uncertainty and deviation, the fatigue performance of the part can be known more visually and clearly through actual fatigue testing, and the fracture mechanism of the part and a life prolonging method can be further known and formulated by observing and analyzing the positions of a fatigue sample fracture and the like at microscopic angles after testing, so that the device has stronger practicability. For fatigue samples of different sizes, the form of the clamp, the clamping force of the hydraulic clamping system and the transverse constant force provided by the cylinder loading mechanism are changed, so that the test can be flexibly carried out on different mechanical parts.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a schematic structural view of a biaxial loading weldment fatigue testing apparatus of the present invention;
FIG. 2 is a schematic view of the hydraulic clamping system of the present invention;
FIG. 3 is a schematic view of the cylinder loading mechanism of the present invention;
FIG. 4 is a schematic view of a mechanical fastening device of the present invention;
FIG. 5 is a diagram illustrating the explosion effect of the intermediate connection location of the present invention;
FIG. 6 is a schematic view of a fatigue test specimen for performing a fatigue test according to the present invention;
FIG. 7 is a schematic flow chart of a biaxial loading weldment fatigue testing method of the present invention.
In the figure: 1. a hydraulic control cabinet; 2. a hydraulic liquid through pipe; 3. a hydraulic pressure gauge; 4. a hydraulic pump; 5. a hydraulic cylinder barrel; 6. a hydraulic cylinder piston rod; 7. a link mechanism hydraulic tong; 8. a clamping block; 9. fastening a bolt; 10. fatigue test samples; 11. a pulsation fatigue testing machine chuck; 12. j-shaped clips; 13. a cylinder piston rod; 14. a cylinder support; 15. a cylinder barrel; 16. a cylinder vent pipe; 17. an air pump; 18. a cylinder base; 19. a hydraulic tong holder.
Detailed Description
The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.
Referring to fig. 1 to 7, the fatigue performance testing device for the biaxial loading weldment of the invention is integrally composed of a hydraulic clamping system, a mechanical fastening device, a cylinder loading mechanism and a pulsation fatigue testing machine in a matching manner. Determining the form of the clamping block according to the surface shape and the size of the tested fatigue sample, and loading and simulating the actual transverse stress of the part by using the cylinder loading mechanism according to the actual working condition. A hydraulic clamping system is utilized to fix one transverse end of a sample, a J-shaped clamp and a clamping block are matched to form a mechanical fastening device and are connected with a cylinder piston rod, so that the sample is transversely positioned and loaded, and a fatigue sample in the vertical direction is clamped on a pulsation fatigue testing machine. The device introduces transverse constant force on the basis of single-shaft loading of the pulsation fatigue testing machine, and the actual stress state of the part is reproduced to the maximum extent. Aiming at the working condition that the large pressure container generates biaxial load stress on the internal pressure acting surface, the device can be used for obtaining more accurate surface weld fatigue data. The invention is different from the traditional uniaxial pulsation fatigue test, the stress of the actual working condition of the part is generally complex, the complex stress condition is generally difficult to estimate and predict, and the stress condition is often corresponding to serious fatigue failure. For the biaxial stress condition of the high-pressure oil pipe, the biaxial loading weldment fatigue testing device can better simulate the actual working condition to obtain the data close to the real fatigue life, and has great benefit for predicting and preventing the harm caused by fatigue failure.
Referring to fig. 1 to 7, the fatigue performance testing apparatus for a biaxial loading weldment of the present invention includes: the hydraulic clamping system of the horizontal one end of centre gripping fatigue sample 10, connect with fatigue sample 10 and cylinder loading device and play fixed and transition mechanical fastening device and the pulsation fatigue test machine chuck 11 of vertical fixed fatigue sample 10 of effect, link mechanism hydraulic tong 7 in carrying out the biaxial loading fatigue test process, the horizontal one end of fatigue sample 10 is fixed to clamp splice 8, play the effect of keeping fatigue sample stability in the test process, the one end that fatigue sample 10 is located cylinder loading mechanism guarantees through mechanical fastening device and the mutual connection of cylinder piston rod 13 that the clamping position does not appear skidding phenomenon and provide stable loading power in the test process. The magnitude of each axial force required by the test is set according to the actual working condition, the transverse constant forces with different magnitudes are output by changing the diameter of the piston rod of the air cylinder and the pressure in the cylinder barrel 15 of the air cylinder, and the longitudinal alternating load is loaded by the control cabinet of the tension-compression pulsation fatigue testing machine and the start and the end of the test are controlled to obtain corresponding fatigue life data.
Referring to fig. 2, the hydraulic clamping system mainly uses a hydraulic cylinder piston rod 6 to drive a link mechanism hydraulic tong 7 to move, so as to control the clamping and loosening of a hydraulic tong head 19 and clamp and fix a clamping block 8 matched with a fatigue sample 10. The hydraulic pump 4 and the hydraulic pressure gauge 3 are used for adjusting and displaying the internal hydraulic pressure of the hydraulic workstation, accurately controlling the clamping force of the hydraulic clamp 7 of the link mechanism, the hydraulic clamp is fixed on a hydraulic control cabinet 1 through fastening bolts, a cylindrical opening fixed hydraulic liquid passing pipe 2 is arranged on the hydraulic control cabinet 1 and a hydraulic cylinder barrel 5, all parts of a hydraulic workstation are connected through the hydraulic liquid passing pipe 2, a hydraulic cylinder piston rod 6 inside the hydraulic cylinder barrel 5 is connected with the cylinder barrel and a link mechanism hydraulic clamp 7, an oval through hole is machined inside the hydraulic cylinder piston rod 6, one end of the cylindrical head is a cylindrical head with the diameter larger than the rod diameter, the whole body is matched with a middle connecting rod of the link mechanism hydraulic clamp, the opening and closing of a hydraulic clamp chuck 19 are controlled by changing the liquid pressure, the hydraulic clamp chuck 19 is connected with a connecting rod movement joint through a pin, and the hydraulic clamp chuck can be changed according to a tested fatigue sample form. The hydraulic pressure in the hydraulic cylinder 5 can be adjusted to the hydraulic pressure workstation, and the equivalence is the centre gripping direction and the dynamics of adjusting link mechanism hydraulic tong 7, and the clamping-force of accurate control hydraulic tong chuck 19 takes different direction and angle centre gripping to the sample of different shapes, adopts different clamping-force to different processing technology or different material samples to avoid producing extra injury to the sample surface in the process of the test, and then influence the fatigue data accuracy.
Referring to fig. 4, the clamping block 8 and the fatigue test sample 10 are fixed by the mechanical fastening device through a manual clamp such as a J-shaped clamp 12, a threaded hole is formed in the side direction of the clamping block 8 and is connected with a cylinder piston rod 13 with an external thread machined at the head, the transverse constant force output stability and the centering property in the test process are guaranteed, the inner surface of the clamping block 8 is machined into a fine convex point pattern, the friction force between the clamping block and the test sample is increased, and the clamping block is not easy to slip in the loading process. Use manual fixture such as J word clamp 12 in order to satisfy the not equidimension clamp splice 8 that different grade type samples correspond, improve the device's suitability, the J word clamp 12 designs into the cylindrical centre gripping position of parallel from top to bottom, has the central depression bar connection of external screw thread with the centre, screws up the centre gripping through the tip swing arm during the use. The manual clamp of the mechanical fastening device is similar to the manual fastening of the fatigue testing machine chuck 11 by the fastening bolt 9, and can meet the clamping force and fixing requirements in the actual test.
Referring to fig. 3, the cylinder loading mechanism is in threaded connection with the clamping block 8 through a cylinder piston rod 13 and is locked, and transmits a transverse constant force, and according to different test conditions, an air pump 17 is used for changing the pressure in the cylinder barrel 15 of the cylinder to provide transverse constant forces with different magnitudes. Open on cylinder support 14 and have the square groove corresponding with 15 head sizes of cylinder section of thick bamboo, it is fixed to mutually support, cylinder support 14 bottom links firmly as an organic whole with cylinder base 18 welding, air pump 17 passes through fastening bolt to be fixed on cylinder base 18, each part of cylinder base 18 upper surface connection, the lower surface is level and smooth, place on horizontal desktop when testing, guarantee whole loading in-process cylinder loading mechanism's stability and the even of the horizontal constant force of output, connect transmission high-pressure gas through cylinder breather pipe 16 between air pump 17 and cylinder section of thick bamboo 15, the inside gas pressure size of control cylinder section of thick bamboo, it provides horizontal constant force to drive the motion of the inside piston rod 13 of cylinder section of thick bamboo 15. The device is mainly applied to fatigue testing of double-shaft stress parts caused by internal pressure of a pressure container and the like, constant transverse constant force is generally provided, and the output force of the air cylinder does not need to be changed in the test process. The cylinder support 14 ensures the stability of the cylinder loading mechanism in the experimental process, and avoids the test errors caused by the problems of machine vibration, eccentricity and the like.
The core position of the biaxial loading weldment fatigue testing device is the fatigue test sample 10, and the fatigue test under special working conditions is completed by loading stress on the fatigue test sample 10 in the biaxial direction. The fatigue test sample 10 is fixed on a chuck 11 of the pulsation fatigue test machine, is manually clamped by using a fastening bolt 9, outputs alternating load in the vertical direction by a control system, and is assisted by a transverse constant force provided by a hydraulic clamping system and a cylinder loading mechanism to realize the whole fatigue test process.
Referring to fig. 1 to 7, the method for testing the fatigue performance of the biaxial loading weldment, disclosed by the invention, comprises the following steps of:
step (1): designing a fatigue sample 10 according to the national standard of fatigue test, correspondingly extending a transverse clamping end at the position of a welding seam, wherein the size of the transverse clamping end is determined by the physical property of the material and the required loading force level, acquiring the required fatigue sample from an actual component according to the size of the designed fatigue sample, and determining the form of a clamping block 8 according to the surface shape and size of the transverse clamping end;
step (2): polishing each surface of the fatigue sample to meet the requirement of surface roughness of a fatigue test, processing a transition arc in the longitudinal integral area of the transverse clamping end and the fatigue sample, and removing factors influencing a fatigue data result, such as linear cutting traces, a surface oxidation layer and the like;
and (3): fixing a sample on a chuck 11 of a pulse fatigue testing machine, ensuring the centering property of the sample, determining the clamping force of a hydraulic clamping system according to the property of a tested material and the shape of the sample, matching a clamping block 8 with the sample and fastening the clamping block by a hydraulic clamp 7 of a link mechanism; determining the diameter of a piston rod of the cylinder and the pressure of the loaded gas according to the transverse constant force required by the actual working condition;
and (4): connecting the cylinder loading mechanism with a mechanical fastening device, fixing the fatigue test sample 10 under the combined action of the cylinder loading mechanism and a hydraulic clamping system, and outputting a transverse constant force;
and (5) determining the vertical pulsating load and test parameters, starting the testing machine through the control system, and starting the test.
Example (b):
referring to fig. 1, the fatigue performance testing device for the biaxial loading weldment comprises a hydraulic clamping system for transversely clamping one end 10 of a fatigue sample, a cylinder loading mechanism for providing transverse constant force, and a mechanical fastening device which is matched with the cylinder loading mechanism for fixing and transferring force, and integrally acts on the fatigue sample 10 and is matched with a pulsation fatigue testing machine for testing. Through the atress analysis to multiaxis loaded part, utilize the actual operating mode of this device reappearing part to carry out fatigue test, obtain more directly perceived, accurate fatigue data, especially for positions that the loading is complicated and stress concentration is serious and easily takes place the danger of inefficacy such as welding seam, this device not only is to the fatigue sample of fixed shape, can change corresponding anchor clamps and change the fatigue sample 10 of big or small test different shapes and the atress condition of output power, through the start and the end of pulsation fatigue test machine switch board loading vertical direction load and control test, obtain corresponding fatigue life data.
Referring to fig. 2 to 6, the fatigue testing device for the biaxial loading weldment is in a form of a fatigue test specimen 10, wherein the fatigue test specimen corresponds to a hydraulic clamping system and a mechanical fastening device for fixing a transverse clamping end of a fatigue test specimen, and a cylinder loading mechanism for outputting transverse constant force is connected through threads, a chuck 11 of a pulsating fatigue testing machine for fixing the whole fatigue test specimen, and the fatigue test specimen is subjected to the biaxial loading weldment fatigue test. During the process of carrying out double-shaft loading fatigue testing, a designed and processed fatigue sample is fixed on a chuck of a pulsation fatigue testing machine, a clamping block in a determined form is taken, a link mechanism hydraulic clamp 7 and the clamping block 8 are matched with each other to fix one transverse end of the fatigue sample, the effect of keeping the stability of the sample in the testing process is achieved, the sample is located at one end of an air cylinder loading system and is fixed through the clamping block 8 and a J-shaped clamp 12 in a mechanical fastening device, an air cylinder piston rod 13 is in threaded connection with the clamping block 8 and is locked to achieve the integral connection of the air cylinder loading mechanism and the device, the phenomenon that the clamp slips is avoided in the testing process, and stable loading force is provided. The device is integrally matched, so that the uniformity and accuracy of the double-shaft load borne and stress of the fatigue sample 10 are ensured, the centering property of the sample in the clamping process is ensured, the clamping stability of the fatigue sample in the vibration starting process of the fatigue test is ensured, and the fatigue data which are in line with the actual accuracy are obtained.
The hydraulic pressure clamping system, hydraulic control cabinet 1, hydraulic cylinder 5, the cylindrical opening that fixed hydraulic pressure leads to the liquid pipe is played in the processing of 4 each parts of hydraulic pump, and lead to liquid pipe 2 interconnect through hydraulic pressure, the pressure variation of the inside high-pressure emulsion of control drives the motion of hydraulic cylinder piston rod 6, 6 front ends of hydraulic cylinder piston rod are link mechanism hydraulic tong 7, the oval through-hole of 6 inside processing of hydraulic cylinder piston rod, the link mechanism motion of mutually supporting in the middle of with the hydraulic tong, drive link mechanism back-and-forth movement, make the opening and shutting of hydraulic tong keep silent, press from both sides and relax arbitrary angle, hydraulic tong chuck 19 etc. are equipped with the axis of rotation, do benefit to rotary motion and sample stable cooperation between each part, and provide the clamp force of corresponding size, play the effect of fixed fatigue sample 10. The connecting rod mechanism has larger degree of freedom in the clamping direction, so that the clamping mechanism can be suitable for clamping objects at different angles and directions. The hydraulic pressure in the reaction cylinder of the hydraulic workstation pressure gauge 3 adopts different clamping forces aiming at different materials or materials of different processing techniques through calculation, clamping blocks 8 of corresponding sizes are adopted for clamping ends of different sizes, and the hydraulic clamp head 19 can also be replaced according to actual conditions so as to avoid generating additional damage to the surface of a sample in the test process and further influence the accuracy of fatigue data.
Mechanical fastening device is pressed from both sides 12 and clamp splice 8 by the J word and is mutually supported fixed tired sample 10 to with the horizontal constant force of cylinder piston rod 13 threaded connection loading, tired sample 10 and clamp splice 8 are whole to be pressed from both sides cylindrical clamping part fastening by the J word, compress tightly screw thread central depression bar downwards through rotatory tip swing arm and reach the tight fixed effect of mechanical fastening device clamp, guarantee that the output of transverse force is stable and even among the test process. The manual clamp such as the J-shaped clamp 12 is applied to adapt to samples of different sizes, the applicability of the device is improved, and the manual clamp is similar to the fatigue testing machine chuck 11 in manual fastening through bolts, so that the clamping force and the fixing requirements in actual testing can be met.
According to the form of the fatigue sample 10, according to the position of a welding line, the structure of the welding line and the size of a part, a standard part or a non-standard part is designed by referring to national standards of a pulsating fatigue tensile test, a transverse clamping end extends out of the corresponding position of the welding line, the whole fatigue sample is in a longitudinal long and transverse short cross shape, at least one side of the fatigue sample 10 is a plane for facilitating clamping, the whole fatigue sample can be adopted for testing an actual component, and the required loading condition and the sample form of the device can be met.
The clamping sample part is used for carrying out fatigue test by applying a biaxial loading weldment fatigue testing device, the longitudinal end of the fatigue sample is clamped by a pulsation fatigue machine chuck 11, a link mechanism hydraulic clamp 7 drives a piston rod to carry out push-pull motion by pressing in a hydraulic cylinder 5 to fixedly clamp one transverse end of the fatigue sample, and the other transverse end of the sample is clamped by applying manual clamps such as a mechanical fastening device and the like, so that the phenomenon of slipping along with the increase of stress in the loading process is avoided; the device is fixed transversely through a hydraulic clamping system, a cylinder loading mechanism outputs transverse constant force, a clamping block 8 is applied to be clamped and matched with a fatigue sample 10, the inner surface of the clamping block 8 is processed into a fine convex point form, the friction force between the clamping block and the sample is increased, and the clamping block is not easy to slip and deviate from the loading direction in the loading process; when the pulse fatigue testing machine works for testing, the stability and consistency of the fatigue test sample 10 and the biaxial-loading welding line fatigue testing device are ensured, and accurate fatigue performance data are obtained.
Referring to fig. 7, a method for testing fatigue performance of a biaxially loaded weldment comprising the steps of:
step (1): designing a fatigue sample 10 according to the national standard of fatigue test, correspondingly extending a transverse clamping end at the position of a welding seam, wherein the size of the transverse clamping end is determined by the physical property of the material and the required loading force level, acquiring the required fatigue sample from an actual component according to the size of the designed fatigue sample, and determining the form of a clamping block 8 according to the surface shape and size of the transverse clamping end;
step (2): polishing each surface of the fatigue sample to meet the requirement of surface roughness of a fatigue test, processing a transition arc in the longitudinal integral area of the transverse clamping end and the fatigue sample, and removing factors influencing a fatigue data result, such as linear cutting traces, a surface oxidation layer and the like;
and (3): fixing a sample on a chuck 11 of a pulse fatigue testing machine, ensuring the centering property of the sample, determining the clamping force of a hydraulic clamping system according to the property of a tested material and the shape of the sample, matching a clamping block 8 with the sample and fastening the clamping block by a hydraulic clamp 7 of a link mechanism; determining the diameter of a piston rod of the cylinder and the pressure of the loaded gas according to the transverse constant force required by the actual working condition;
and (4): connecting the cylinder loading mechanism with a mechanical fastening device, fixing the fatigue test sample 10 under the combined action of the cylinder loading mechanism and a hydraulic clamping system, and outputting a transverse constant force;
and (5) determining the vertical pulsating load and test parameters, starting the testing machine through the control system, and starting the test.
The technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments, wherein the specific embodiments and descriptions are only used for explaining the present invention, but not for limiting the present invention.
The parts related to the embodiment are hanging ring buckle welding seam structures of the hydraulic support upright cylinder barrel for the mine, the materials are 27SiMn low-carbon alloy steel, fillet weld joints are connected by adopting a carbon dioxide arc welding method, the type of a welding wire is ER50-6, in an actual component, fatigue samples with required sizes are taken, and according to the working rated pressure of the hydraulic support upright cylinder barrel under the actual working condition, the transverse constant force borne by a surface welding seam is converted by a formula. The fatigue test piece is clamped on the double-shaft loaded weldment fatigue testing device, the clamping is stable, the centering performance of the fatigue test piece is guaranteed, the slippage phenomenon does not occur in the loading process, the stress is uniform, and the required test parameters are set to start the test.
The method mainly comprises the following steps:
designing a fatigue sample according to the structural size of a part to be subjected to a fatigue test and parameters of a pulsating fatigue testing machine, wherein the size of the fatigue sample is 350mm multiplied by 60mm multiplied by 5mm, the size of a transverse clamping end is 50mm multiplied by 20mm, a clamping block 8 with an arc-shaped inner surface and a size of 70mm multiplied by 40mm multiplied by 25mm is designed according to the surface shape and the size of the tested fatigue sample, and the clamping block can be tightly matched with the clamping end of the fatigue sample;
secondly, carrying out abrasive paper grinding treatment on the fatigue test sample 10 taken down from the actual component, removing factors influencing the fatigue data result, such as linear cutting marks, surface oxidation layers and the like, continuing grinding until the surface roughness requirement (generally less than 0.2 mu m) of the fatigue test is met, and reducing the influence of the surface factors on fatigue cracks;
and thirdly, setting a pulsating load parameter according to the physical property of the fatigue test sample, loading a sinusoidal cyclic stress, converting the rated working pressure of the cylinder barrel of the hydraulic support under the actual working condition to 47MPa according to a formula, and converting the transverse constant force applied to the surface welding seam to 245MPa according to a formula.
And fourthly, clamping the polished fatigue sample on a biaxial loading weldment fatigue testing device, and ensuring that the sample is clamped vertically, stably and centrally. The loading system outputs 245MPa of transverse force, and the loading force is stable and uniform.
And fifthly, inputting sinusoidal cyclic load parameters into the pulsating fatigue testing machine, starting the testing machine through the control cabinet, and starting testing. And stopping the machine when the fatigue test sample cracks, and recording the cycle number of the fatigue test sample under a certain stress level, namely the fatigue life.
The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like of the present invention shall be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a biax loaded weldment fatigue performance testing arrangement which characterized in that: the method comprises the following steps:
the hydraulic clamping system is used for fixing one transverse end of the fatigue test sample (10);
the cylinder loading mechanism is used for providing a transverse constant force required by the test for the fatigue test sample (10);
the mechanical fastening device is matched with the cylinder piston rod (13) and the fatigue test sample (10) and clamps the transverse other end of the fatigue test sample (10);
the fatigue test piece (10) is vertically clamped on a chuck (11) of the pulsation fatigue test machine, a control system of the test machine is started and loads a tension-compression pulsation load, and the tension-compression pulsation load is matched with a transverse constant force loaded by the cylinder loading mechanism to jointly act on the fatigue test piece (10) until the fatigue test piece (10) is subjected to fatigue failure, so that fatigue data are obtained.
2. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the hydraulic clamping system adjusts the flow of high-pressure emulsion through a hydraulic workstation to change the liquid pressure in the hydraulic cylinder barrel (5), controls the movement of a piston rod (6) of the hydraulic cylinder and further drives a hydraulic clamp (7) of a link mechanism connected with the piston rod to clamp and release.
3. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the hydraulic clamping system is as follows: cylindrical openings are arranged on the hydraulic workstation box body and the hydraulic cylinder barrel (5) to fix the hydraulic liquid through pipe (2), the hydraulic liquid through pipe (2) is connected and filled with high-pressure emulsion, the pressure in the hydraulic cylinder body is controlled to drive the hydraulic cylinder piston rod (6) to move, and the clamping force is adjusted by changing the internal pressure of the hydraulic cylinder barrel (5); an oval through hole is processed in a piston rod (6) of the hydraulic cylinder, one end of the piston rod is a cylindrical head part with the diameter larger than the rod diameter, and the piston rod is matched with a hydraulic clamp (7) of a link mechanism to fix one transverse end of a fatigue sample; the connecting rod mechanism hydraulic clamp (7) is composed of a plurality of oval and dart-shaped connecting rods, pins are placed at the moving joints in a connecting mode, and the connecting rods of all parts are driven to move through the movement of the hydraulic piston rod (6), so that the effect of clamping the fatigue sample (10) is achieved.
4. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the air cylinder loading mechanism takes an air cylinder as a main body to output transverse constant force, an air cylinder piston rod (13) is connected with a clamping block (8) of the mechanical fastening device through threads, the mechanical fastening device is connected with the air cylinder loading mechanism, air pressure in an air cylinder barrel (15) is controlled through an air pump (17), and then the air cylinder piston rod (13) is driven to do push-pull movement to output transverse load stress required by a test.
5. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the mechanical fastening device consists of a manual clamp clamping block (8) and a J-shaped clamp (12) and aims to fix one transverse end of the fatigue test sample (10) and connect with the cylinder loading mechanism; the whole clamping block (8) contacts with a cylindrical clamping part at the bottom of the J-shaped clamp, a screw thread central pressure rod is pressed downwards through a rotating end rotating rod to be clamped and fixed, the clamping block (8) is in threaded connection with a cylinder piston rod (13), required transverse constant force is output, a mechanical fastening device plays a role in fixing and connection transition, the fatigue test sample (10) cannot slide relative to the clamping block when being subjected to transverse constant force loaded by a cylinder, and the stress is uniform.
6. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the transverse clamping end of the fatigue sample (10) is processed into a cross shape, the length of the transverse clamping end corresponds to the size of the welding seam, the welding seam is guaranteed to be always acted by transverse constant force and stressed uniformly in the test process, and different forms of clamping blocks (8) are selected to be connected with the transverse clamping end of the fatigue sample according to the surface shape and size of the sample.
7. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: the fatigue test piece (10) is longitudinally clamped on the pulsation fatigue testing machine, the fatigue test piece (10) is loaded with load stress in the vertical direction through the control system, the purpose of double-shaft loading is achieved by matching the transverse constant force output by the cylinder loading mechanism, and the loading load is changed according to the testing requirement.
8. The biaxial loading weldment fatigue performance testing apparatus of claim 1 further comprising: based on the fatigue performance design of testing the flying ring buckle welding line on the surface of the cylinder barrel of the high-pressure hydraulic cylinder, due to the effect of internal pressure of high-pressure emulsion in the cylinder body, the welding line on the surface of the cylinder barrel is under the action of axial and tangential biaxial load stress, and in order to meet the actual working condition of a fatigue test, an air cylinder is added on the basis of the original tension and compression pulsation load to provide tangential stress, so that the stress characteristic of the welding line on the surface of an actual pressure container is simulated.
9. A biaxial loading weldment fatigue performance testing method is characterized by comprising the following steps: the method comprises the following steps:
designing a fatigue sample (10) according to the national standard of a fatigue test, correspondingly extending a transverse clamping end at the position of a welding seam, determining the size of the transverse clamping end by the physical property of a material and the required loading force level, acquiring the required fatigue sample from an actual component according to the size of the designed fatigue sample, and determining the form of a clamping block (8) according to the surface shape and size of the transverse clamping end;
polishing each surface of the fatigue sample to meet the requirement of surface roughness of a fatigue test, processing a transition arc in the longitudinal integral area of the transverse clamping end and the fatigue sample, and removing factors of linear cutting traces and a surface oxidation layer which influence the fatigue data result;
fixing the sample on a chuck (11) of the pulse fatigue testing machine, ensuring the centering property of the sample, determining the clamping force of a hydraulic clamping system according to the property of a tested material and the shape of the sample, matching a clamping block (8) with the sample and fastening the clamping block and the sample through a hydraulic clamp (7) of a link mechanism; determining the diameter of a piston rod of the cylinder and the pressure of the loaded gas according to the transverse constant force required by the actual working condition;
connecting the cylinder loading mechanism with a mechanical fastening device, fixing the fatigue test sample (10) under the combined action of the cylinder loading mechanism and a hydraulic clamping system, and outputting a transverse constant force;
and step five, determining the vertical pulsating load and test parameters, starting the testing machine through the control system, and starting the test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110827847.7A CN113514336A (en) | 2021-07-22 | 2021-07-22 | Biaxial-loading weldment fatigue performance testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110827847.7A CN113514336A (en) | 2021-07-22 | 2021-07-22 | Biaxial-loading weldment fatigue performance testing device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113514336A true CN113514336A (en) | 2021-10-19 |
Family
ID=78068541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110827847.7A Pending CN113514336A (en) | 2021-07-22 | 2021-07-22 | Biaxial-loading weldment fatigue performance testing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113514336A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279838A (en) * | 2021-12-20 | 2022-04-05 | 扬州大学 | Tensile test manufacturing method for filament fibers |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020162400A1 (en) * | 2001-03-05 | 2002-11-07 | Ming Xie | Multiaxial high cycle fatigue test system |
| US20120222491A1 (en) * | 2011-03-01 | 2012-09-06 | Bell Helicopter Textron Inc. | Short Beam Shear Test Fixture |
| CN102778393A (en) * | 2012-06-06 | 2012-11-14 | 美特斯工业系统（中国）有限公司 | Full-automatic tension testing machine |
| US20130081476A1 (en) * | 2008-03-12 | 2013-04-04 | Rolls-Royce Plc | Fatigue test arrangement |
| CN104297079A (en) * | 2014-09-16 | 2015-01-21 | 南京航空航天大学 | Testing device and testing method for fretting fatigue of end-tooth structure |
| CN107389440A (en) * | 2017-06-29 | 2017-11-24 | 中车长春轨道客车股份有限公司 | A kind of biaxial fatigue test fixture |
| CN107727523A (en) * | 2017-10-18 | 2018-02-23 | 浙江工业大学 | A kind of multifunction manual hip joint abrasion tester |
| CN207396253U (en) * | 2017-10-18 | 2018-05-22 | 浙江工业大学 | A kind of multifunction manual hip joint abrasion tester |
| CN108562506A (en) * | 2018-03-08 | 2018-09-21 | 西南交通大学 | High frequency in situ imaging fatigue tester |
| CN208588629U (en) * | 2018-06-26 | 2019-03-08 | 蒋继恒 | A kind of reinforcing bar detection device of the hydraulic engineering convenient for adjusting |
| CN110579404A (en) * | 2019-09-12 | 2019-12-17 | 吉林大学 | In-situ test instrument and method for mechanical property of material under high-temperature complex mechanical load |
| CN110907298A (en) * | 2019-11-20 | 2020-03-24 | 北京建筑大学 | Biaxial loading fretting fatigue test system and method |
| CN112595613A (en) * | 2020-11-24 | 2021-04-02 | 江苏徐工工程机械研究院有限公司 | Device and method for testing bending fatigue performance of coating of piston rod of hydraulic cylinder |
-
2021
- 2021-07-22 CN CN202110827847.7A patent/CN113514336A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020162400A1 (en) * | 2001-03-05 | 2002-11-07 | Ming Xie | Multiaxial high cycle fatigue test system |
| US20130081476A1 (en) * | 2008-03-12 | 2013-04-04 | Rolls-Royce Plc | Fatigue test arrangement |
| US20120222491A1 (en) * | 2011-03-01 | 2012-09-06 | Bell Helicopter Textron Inc. | Short Beam Shear Test Fixture |
| CN102778393A (en) * | 2012-06-06 | 2012-11-14 | 美特斯工业系统（中国）有限公司 | Full-automatic tension testing machine |
| CN104297079A (en) * | 2014-09-16 | 2015-01-21 | 南京航空航天大学 | Testing device and testing method for fretting fatigue of end-tooth structure |
| CN107389440A (en) * | 2017-06-29 | 2017-11-24 | 中车长春轨道客车股份有限公司 | A kind of biaxial fatigue test fixture |
| CN107727523A (en) * | 2017-10-18 | 2018-02-23 | 浙江工业大学 | A kind of multifunction manual hip joint abrasion tester |
| CN207396253U (en) * | 2017-10-18 | 2018-05-22 | 浙江工业大学 | A kind of multifunction manual hip joint abrasion tester |
| CN108562506A (en) * | 2018-03-08 | 2018-09-21 | 西南交通大学 | High frequency in situ imaging fatigue tester |
| CN208588629U (en) * | 2018-06-26 | 2019-03-08 | 蒋继恒 | A kind of reinforcing bar detection device of the hydraulic engineering convenient for adjusting |
| CN110579404A (en) * | 2019-09-12 | 2019-12-17 | 吉林大学 | In-situ test instrument and method for mechanical property of material under high-temperature complex mechanical load |
| CN110907298A (en) * | 2019-11-20 | 2020-03-24 | 北京建筑大学 | Biaxial loading fretting fatigue test system and method |
| CN112595613A (en) * | 2020-11-24 | 2021-04-02 | 江苏徐工工程机械研究院有限公司 | Device and method for testing bending fatigue performance of coating of piston rod of hydraulic cylinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114279838A (en) * | 2021-12-20 | 2022-04-05 | 扬州大学 | Tensile test manufacturing method for filament fibers |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108709793B (en) | Loading device and method for bending-torsion vibration fatigue test | |
| CN109883833B (en) | Device and method for testing fatigue mechanical properties of material under tensile-bending composite load | |
| CN101598647B (en) | Steel wire fretting fatigue testing machine and method | |
| CN102353590B (en) | Test method and device for monitoring steel wire fretting fatigue state | |
| CN109507037A (en) | A kind of small drill drift creepage experimental rig and method that can be achieved precisely continuously to load | |
| CN201497672U (en) | Steel wire micro-motion fatigue tester | |
| CN209878482U (en) | Device for testing fatigue mechanical properties of material under tensile-bending composite load | |
| CN108362554A (en) | A kind of three-point bending vibrating fatigue device with axial tension function | |
| CN206876479U (en) | A kind of fixture for being used to test reinforced plastics interlayer shear strength | |
| CN106017959A (en) | Lead screw guide rail reliability testing stand based on electro-hydraulic servo loading | |
| CN113514336A (en) | Biaxial-loading weldment fatigue performance testing device and method | |
| CN106918417B (en) | Steel plate membrane stress tests force application apparatus | |
| CN109556944B (en) | High-flux mechanical test device | |
| CN113405922A (en) | Device and method for testing pure shear creep property of energetic material | |
| CN107063538B (en) | Clamping device for testing residual stress of sample by blind hole method | |
| CN208254934U (en) | A kind of three-point bending vibrating fatigue device with axial tension function | |
| CN108469380A (en) | A kind of device for realizing rock tensile shear testing using universal testing machine | |
| CN105466773B (en) | Material testing machine | |
| CN105928783A (en) | Multiaxial fatigue performance test fixture for round bar specimen | |
| CN114136780A (en) | Marine stud welding joint tensile test device and method | |
| CN113405910A (en) | Biaxial tensile mechanical property testing device and method for multi-configuration test piece | |
| CN206095662U (en) | Furniture structure joint endurance bending strength testing arrangement | |
| CN204286930U (en) | For the loading fixture of track testing fatigue | |
| CN210269445U (en) | Multidimensional loading comprehensive test system | |
| CN220508686U (en) | Horizontal impact test equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20211019 |