CN104596695A - Loading device for accurately controlling rivet preload of riveting member - Google Patents
Loading device for accurately controlling rivet preload of riveting member Download PDFInfo
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- CN104596695A CN104596695A CN201510041283.9A CN201510041283A CN104596695A CN 104596695 A CN104596695 A CN 104596695A CN 201510041283 A CN201510041283 A CN 201510041283A CN 104596695 A CN104596695 A CN 104596695A
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- pin
- riveting
- preload
- bolt
- rivet
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- 230000036316 preload Effects 0.000 title abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 239000011888 foil Substances 0.000 claims 1
- 238000009661 fatigue test Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 238000010998 test method Methods 0.000 abstract description 6
- 230000003068 static effect Effects 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a loading device for accurately controlling rivet preload of a riveting member. The device is composed of a bolt (1), a ring clamp (2), a strain gauge (6) attached to the outside of the ring clamp, a pin (3) and a press block (7). The strain gauge is in the vertical direction. The tightening load of the bolt is applied to the pin (3). A test method includes the steps of pressing the press block (7) by tightening the bolt (1), measuring the strain of the preload exerted by the bolt through a static strain indicator connected to the strain gauge attached to ring clamp (2) and accurately calculating the preload required by a test according to a corresponding preload formula. The loading device for accurately controlling rivet preload of the riveting member is reliable in method principle, uniform in loading force, high in test accuracy, accurate in data recording and result analysis, capable of avoiding negative factors on a riveting fretting fatigue test under the premise of not knowing how much the preload is and especially suitable for the research of the influence of riveting structure preload on the fatigue life.
Description
Technical Field
The invention relates to a test method, in particular to a loading device for accurately controlling the pretightening force of a rivet in a riveting structure.
Background
Fretting fatigue is widely present in a variety of mechanical components, particularly connections with rivets, bolts, pins, and other interference means. Riveting is widely used in structural connections due to its reliable connection, light weight, low cost, etc. The fatigue performance of the riveted member is affected by various factors such as riveting process, structural member material, external load and the like. In the riveting process, the micro fatigue damage of the riveted structure is greatly influenced by the rivet pressing force: the large riveting force can lead to large pretightening force of the rivet, and fretting fatigue cracks can be initiated at the edge of the rivet head; the small riveting force can cause the small pretightening force of the rivet, and the fretting fatigue crack can be initiated at the edge of the rivet hole. Therefore, the control of the pretightening force of the riveting fretting fatigue test is very important.
At present, there are several riveting fretting fatigue test methods, and the most common method is a test method for simulating riveting by designing a reasonable bolt, a test method for performing pressure riveting directly by a rivet, and the like. However, the methods cannot effectively measure the pretightening force of the riveting fretting fatigue test. For example, a method for simulating a riveting fretting fatigue test by using a bolt with reasonable design can measure the pretightening force in a manner of wrench torque, but the pretightening force of the riveting fretting fatigue test cannot be known and mastered in time along with the continuous change of test load and times, so that the test result can be changed greatly, and accurate test data and result cannot be obtained; the test method of directly performing rivet pressing through the rivet can generate great plastic deformation in the process of performing rivet pressing, so that the accurate pre-tightening force of the test cannot be known. Therefore, it is necessary to design a loading device for accurately controlling the rivet preload.
Disclosure of Invention
The invention aims to provide a loading device for accurately controlling the rivet pretightening force in a riveting structure, which is an improvement on a method for simulating a riveting fretting fatigue test based on a pin.
The loading device for accurately controlling the pretightening force of the rivet comprises a bolt 1, a circular ring clamp 2 and a strain gauge 6 attached to the outer part of the circular ring clamp, wherein the strain gauge is in the vertical direction, the bolt on the upper wall and the bolt on the lower wall can be screwed, pressure is applied to a pressing block 7, and therefore a load is applied to a pin 3.
The invention has the beneficial effects that the test method for measuring the riveting fretting fatigue test pretightening force is provided, the pretightening force at the riveting interface can be effectively controlled, and unpredictable cracks at the riveting joint caused by the influence of the pretightening force are avoided. The testing method has the advantages of reliable principle, uniform loading force, high testing accuracy, accurate data recording and analysis, and great significance for researching the fatigue life of the riveting micro-motion test under the influence of the pretightening force.
Drawings
FIG. 1 is a front view of a test device for measuring the pretightening force of a riveting fretting fatigue test specimen in the invention. The riveting test piece is formed by connecting a plate 4 and a plate 5 together through a pin 3. The riveting test piece is placed in the middle of the circular ring clamp 2, and the test piece is clamped up and down along the axis of the pin 3 through the two bolts 1 and the pressing block 7. The outer side wall of the ring clamp is pasted with a strain gauge 6.
FIG. 2 is a left side view of the testing device for measuring the pretightening force of the fretting fatigue test of the riveting member in the invention.
Fig. 3 is a schematic diagram of the 1/4 structure of the loading ring clamp 2 of the present invention. WhereinIs the inner diameter of the ring clamp 2,is the outer diameter of the ring clamp 2,is the neutral radius of the ring clamp 2,Pthe interface at the inboard point S is A-A for maximum vertical load during the test, and M is the bending moment at the inboard point S.
Detailed Description
The device comprises a circular ring clamp 2 and two bolts 1 on the same axis. The end part of the bolt 1 is required to apply contact load to the pressing block 7, and the end part of the bolt is designed to be hemispherical so as to ensure that the contact pressure applied by the pressing block 7 is uniform. When a load is applied, the hemispherical end part is contacted with the center of the upper surface of the pressing block 7 so as to ensure that the contact pressure of the two ends of the pressing block 7 is equal.
During installation, the pressing block 7 is horizontally placed at the contact position of the two plates and the pin 3, so that the center line of the bolt 1 and the center line of the pin 3 are on the same straight line, the uniform load can be guaranteed to be applied to the two ends of the pressing block, and then the bolts 1 at the two ends of the circular ring clamp 2 are screwed tightly. The pin 3 and the press block 7 together simulate a rivet after clinching. Connecting the strain gauges 6 attached to two ends of the circular ring clamp 2 with a static strain gauge through a lead, observing numerical values on the strain gauge through the adjusting bolt 1, and calculating pressing force applied by a test according to a corresponding formula, wherein the calculation method comprises the following steps:
as shown in fig. 3, the maximum stress generated at the inner point S is represented by the formula:
in the formula:is a bending momentMThe stress (MPa) generated at the inner point S,is a pulling forceP(N) the stress (MPa) generated,Eis the elastic modulus (MPa) of the material of the ring clamp 2,the strain value measured by the strain gauge 6 in the test is shown.
Wherein,
in the formula:Pfor the maximum vertical load (N) during the test,h=-，andrespectively the inner diameter (mm) and the outer diameter (mm) of the circular ring clamp 2,baxial thickness (mm) and bending moment of the ring clamp 2MIs obtained by the following formula:
in the formula,is the radius (mm) of the neutral circle of the ring clamp 2.
Claims (4)
1. The utility model provides a loading device of rivet pretightning force among accurate control riveted structure, its characterized in that riveting test piece is in the same place through pin 3 by board 4 and board 5, and the riveting test piece passes the centre of ring anchor clamps 2, steps up the test piece from top to bottom along pin 3 axis through two bolts 1 and briquetting 7, posts foil gage 6 on the 2 lateral walls of ring anchor clamps to through the meeting an emergency of measuring ring anchor clamps 2, indirectly obtain the pretightning force of riveting the test piece.
2. The ring clamp 2 according to claim 1, wherein the upper and lower walls of the ring clamp 2 are each provided with a bolt 1 in the radial direction, the pin 3 and the press block 7 are pressed by tightening the bolts, and the strain gauge 6 is attached to the side wall, and the pressing force can be indirectly obtained by measuring the strain of the side wall.
3. The pin 3 according to claim 1, characterized in that the pin 3 is a T-shaped cylindrical pin and the press piece 7 fitted on the other end of the pin 3 together form a simulated rivet structure.
4. A pressing block 7 according to claim 1, characterized in that the pressing block 7 is a cylindrical structure, the depth of the inner cylindrical hole is larger than the length of the test piece extending from the tail end of the pin 1, so that a certain gap is left between the bottom of the inner hole of the pressing block 7 and the tail end of the pin 1, and the pin head is not blocked when the pressing block is pressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041283.9A CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041283.9A CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104596695A true CN104596695A (en) | 2015-05-06 |
| CN104596695B CN104596695B (en) | 2017-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510041283.9A Expired - Fee Related CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
Country Status (1)
| Country | Link |
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| CN (1) | CN104596695B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443920A (en) * | 2018-12-03 | 2019-03-08 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Environment-pulling force coupling test devices, systems, and methods |
| CN111650063A (en) * | 2020-07-02 | 2020-09-11 | 天津科技大学 | Normal load loading device based on single-shaft fatigue testing machine |
| CN111999172A (en) * | 2020-08-31 | 2020-11-27 | 中国商用飞机有限责任公司 | Test fixture, device and method for rivet composite loading test |
| CN113478214A (en) * | 2021-07-13 | 2021-10-08 | 大连理工大学 | Small-size bolt pre-tightening process and device based on axial pre-load |
Citations (8)
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|---|---|---|---|---|
| SE427308B (en) * | 1982-04-28 | 1983-03-21 | Giuseppe Milazzo | Method and arrangement for measuring the mechanical stress in a rivet holding together at least two parts |
| EP0488446A1 (en) * | 1990-11-29 | 1992-06-03 | Sofitech N.V. | Pressure transducer with strain gauge for fitting on the end flange of a pipeline or of a casing and assembly unit implementing same |
| CN1808085A (en) * | 2005-12-13 | 2006-07-26 | 上海冠华科技有限公司 | Fastener pull-out force detector |
| WO2012153558A1 (en) * | 2011-05-12 | 2012-11-15 | 日産自動車株式会社 | Quality management method, quality management gauge, and gauge set for screw axis-shaped component |
| CN102879137A (en) * | 2012-10-10 | 2013-01-16 | 北京理工大学 | Flexible fixing device for residual stress detection |
| CN203178010U (en) * | 2013-01-24 | 2013-09-04 | 贵州航天精工制造有限公司 | Efficient testing machine for detecting test pretightening force |
| CN203171433U (en) * | 2013-03-21 | 2013-09-04 | 无锡市利钧轴承有限公司 | Clamp for grinding small outer circle of eccentric sleeve |
| CN104019968A (en) * | 2014-05-20 | 2014-09-03 | 北京航空航天大学 | Testing system for testing fatigue performance of propeller blades |
-
2015
- 2015-01-28 CN CN201510041283.9A patent/CN104596695B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE427308B (en) * | 1982-04-28 | 1983-03-21 | Giuseppe Milazzo | Method and arrangement for measuring the mechanical stress in a rivet holding together at least two parts |
| EP0488446A1 (en) * | 1990-11-29 | 1992-06-03 | Sofitech N.V. | Pressure transducer with strain gauge for fitting on the end flange of a pipeline or of a casing and assembly unit implementing same |
| CN1808085A (en) * | 2005-12-13 | 2006-07-26 | 上海冠华科技有限公司 | Fastener pull-out force detector |
| WO2012153558A1 (en) * | 2011-05-12 | 2012-11-15 | 日産自動車株式会社 | Quality management method, quality management gauge, and gauge set for screw axis-shaped component |
| CN102879137A (en) * | 2012-10-10 | 2013-01-16 | 北京理工大学 | Flexible fixing device for residual stress detection |
| CN203178010U (en) * | 2013-01-24 | 2013-09-04 | 贵州航天精工制造有限公司 | Efficient testing machine for detecting test pretightening force |
| CN203171433U (en) * | 2013-03-21 | 2013-09-04 | 无锡市利钧轴承有限公司 | Clamp for grinding small outer circle of eccentric sleeve |
| CN104019968A (en) * | 2014-05-20 | 2014-09-03 | 北京航空航天大学 | Testing system for testing fatigue performance of propeller blades |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443920A (en) * | 2018-12-03 | 2019-03-08 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Environment-pulling force coupling test devices, systems, and methods |
| CN111650063A (en) * | 2020-07-02 | 2020-09-11 | 天津科技大学 | Normal load loading device based on single-shaft fatigue testing machine |
| CN111999172A (en) * | 2020-08-31 | 2020-11-27 | 中国商用飞机有限责任公司 | Test fixture, device and method for rivet composite loading test |
| CN111999172B (en) * | 2020-08-31 | 2021-10-26 | 中国商用飞机有限责任公司 | Test fixture, device and method for rivet composite loading test |
| CN113478214A (en) * | 2021-07-13 | 2021-10-08 | 大连理工大学 | Small-size bolt pre-tightening process and device based on axial pre-load |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104596695B (en) | 2017-01-25 |
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