CN108820049A - A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing - Google Patents
A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing Download PDFInfo
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- CN108820049A CN108820049A CN201810699453.6A CN201810699453A CN108820049A CN 108820049 A CN108820049 A CN 108820049A CN 201810699453 A CN201810699453 A CN 201810699453A CN 108820049 A CN108820049 A CN 108820049A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Chemical & Material Sciences (AREA)
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Abstract
A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing, including：B column outside plate, infinitesimal born of the same parents filled layer, B column inner panel；Infinitesimal born of the same parents' filled layer be from multiple unit cell spaces X to be combined in Y-direction made of stereochemical structure；Unit cell space is connected and composed by two symmetrical subelement born of the same parents；Subelement born of the same parents include：Power transmission portion, the first vertical energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing portion, the second lateral energy-absorbing portion；Power transmission portion one end is connect by first level force transmitting board with the first vertical energy-absorbing portion, and the other end is connect with the first lateral energy-absorbing portion；The first vertical energy-absorbing portion is connect with the second vertical energy-absorbing portion, and the angle between the first vertical energy-absorbing portion and the second vertical energy-absorbing portion is 135-165 °；Described first lateral energy-absorbing portion is connect with the second lateral energy-absorbing portion by the second horizontal force transmitting board；The other end in the second lateral energy-absorbing portion is connect with the second vertical energy-absorbing portion.Initial spike is low when the automobile B-column collides, and endergonic process is stablized, and energy-absorbing effect is good.
Description
Technical field
The invention belongs to technical field of automobile parts, and the automobile B of energy-absorbing is concentrated more particularly to a kind of achievable multi-axial cord
Column.
Background technique
With the continuous rising of car ownership, the occurrence frequency of motor traffic accidents also gradually increases, and automobile primary is passive
Safety becomes more and more important.In U.S.'s collision accident investigation statistics, the probability of side collision accounts for 7%, collides thing in Japan
Therefore in investigation statistics, the probability of side collision accounts for 12.7%.It is the position apart from driver's relative close, to driving because of side impact
The life security of member has very big threat, so reinforcing the safety of side collision is particularly important.
B column is the main energy absorbing members of side collision and the hot spot of numerous scholars research side collision.Currently, improving
The general measures of Side-impact safety are to improve panel thickness and increase reinforcing rib, and will lead to automobile in this way and become weight, are discontented with
The trend requirement of sufficient automotive light weight technology.
With the development of carbon fibre material, there are many scholars to propose the idea of carbon fiber B column.In Chinese patent
A kind of internal reinforcing plates made of carbon fibre composite are proposed in CN206231454 U, the novel B that steel outside plate is constituted
Rod structure, high, the light-weight advantage using carbon fiber strength, can under conditions of guaranteeing crash-worthiness, to steel plate outside former B column into
Row part hollow out simplifies, so that weight is reduced, but the complex forming technology of carbon fiber, and quality controls not perfect, cost
It is higher.
In recent years, Multi-halfwaves Filters were evolving and applied, the superior energy absorption performance of Multi-halfwaves Filters and itself is included
Light-weighted performance has become the research hotspot of every profession and trade, equally, if it is reasonably applied on automobile B-column,
Positive effect can be generated.205440545 U of Chinese patent CN discloses a kind of " a kind of honeycomb interlayer automobile B-column ", the automobile
B column mainly improves the safety system of side impact using honeycomb interlayer as energy absorbing component so as to improve Side-impact safety energy
Number.But since honeycomb energy absorbing structure collision initial spike is high, endergonic process is unstable, and when collision can bring very big rush to human body
Power is hit, personnel are caused centainly to injure, are unfavorable for energy-absorbing；Further, since honeycomb energy absorbing structure endergonic process stock utilization is low,
So integral energy-absorbing effect is undesirable.
Summary of the invention
The purpose of the present invention is to provide the automobile B-columns that a kind of achievable multi-axial cord concentrates energy-absorbing, to solve existing automobile B
Column side weight is big, high production cost, and initial spike is high when collision, and endergonic process is unstable, the bad skill of energy-absorbing effect
Art problem.
To achieve the above object, the present invention adopts the following technical scheme that realization：
A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing, including：B column outside plate, infinitesimal born of the same parents filled layer, B column inner panel；The B
Column outside plate is arranged in outermost；The infinitesimal born of the same parents filled layer is arranged among B column outside plate and B column inner panel；The B column inner panel setting
In most inner side；The improvement done is：The infinitesimal born of the same parents filled layer be from multiple unit cell spaces X to be arranged successively group in Y-direction
Stereochemical structure made of conjunction；
The unit cell space is connected and composed by two symmetrical subelement born of the same parents；The subelement born of the same parents include：Power transmission portion, first are erected
To energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing portion, the second lateral energy-absorbing portion；Power transmission portion one end passes through first
Horizontal force transmitting board is connect with the first vertical energy-absorbing portion, and the other end is connect with the first lateral energy-absorbing portion, and power transmission portion is laterally inhaled with first
Angle between energy portion is acute angle；The first vertical energy-absorbing portion is connect with the second vertical energy-absorbing portion, the first vertical energy-absorbing portion with
Angle between second vertical energy-absorbing portion is 135-165 °；Described first lateral energy-absorbing portion passes through second with the second lateral energy-absorbing portion
Horizontal force transmitting board connection, the second horizontal force transmitting board is consistent with the outer surface length of first level force transmitting board, the second horizontal force transmitting board
It is connect with the first level force transmitting board of another unit cell space, is sequentially connected unit cell space in Y-direction；Described first lateral energy-absorbing
Angle between portion and the second horizontal force transmitting board is 150 ° -160 °；The second lateral energy-absorbing portion and the second horizontal force transmitting board it
Between angle be 150 ° -160 °, the other end in the second lateral energy-absorbing portion is connect with the second vertical energy-absorbing portion, angle between the two
For acute angle；It is machined with connection buffer table in power transmission portion and the outer surface of the first lateral energy-absorbing portion connecting pin, in the second lateral energy-absorbing
Portion is same as the outer surface of the second vertical energy-absorbing portion connecting pin to be machined with connection buffer table, by connecting buffer table for symmetrical two
A subelement born of the same parents connection, at the same by each unit cell space in X to being sequentially connected.
As a preference of the present invention, infinitesimal born of the same parents' filled layer is the integral structure of 3D printing, constitutes infinitesimal born of the same parents and fill out
Fill the power transmission portion in layer on unit cell space, the first vertical energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing portion, the second cross
It is identical as the wall thickness of the second horizontal force transmitting board to energy-absorbing portion, first level force transmitting board；And it the first lateral energy-absorbing portion, second laterally inhales
Energy portion, the first vertical energy-absorbing portion are identical as the length in the second vertical energy-absorbing portion, and the length in the power transmission portion is 15-18mm；It is described
The length of second horizontal force transmitting board is 2-4mm.
As present invention further optimization, the angle between the first vertical energy-absorbing portion and the second vertical energy-absorbing portion is
150 °, the angle between the described first lateral energy-absorbing portion and the second horizontal force transmitting board is 150 °；The second lateral energy-absorbing portion with
Angle between second horizontal force transmitting board is 150 °, and the angle between power transmission portion and the first lateral energy-absorbing portion is 50-70 °, best
It is 60 °.
As present invention further optimization, infinitesimal born of the same parents' filled layer passes through 3D printing using lactic acid composite material
Integral structure, proof strength requirement under, it is environmentally protective using lactic acid composite material, it is degradable, and draw materials extensively, come
From in crops, production cost can be substantially reduced；In addition, for the intensity for guaranteeing infinitesimal born of the same parents filled layer, the infinitesimal born of the same parents filled layer
It is mixed with preferably with polylactic acid and basalt fibre by each 50%, basalt fibre is staple fiber, and the two mixing intensity reaches
Highest.
The advantages of the present invention are：
（1）Automobile B-column structure provided by the invention is simple, and energy-absorbing effect is good, adaptable, is suitable for many vehicles, automobile B
Column utilizes the energy-absorbing on each unit cell space in infinitesimal born of the same parents' filled layer by filling infinitesimal born of the same parents filled layer in existing automobile B-column
Space increases energy-absorbing effect；When being impacted, unit cell space can generate Negative poisson's ratio, can by the material of surrounding to
Force part is concentrated, and there is very high stock utilization to make it possible to measure bigger suction so as to undertake bigger load
It receives, compares honeycomb class packing material, side collision initial spike reduces, and it is close with plateau stress area, while stress plateau area
Long and steady, endergonic process is more stable, can preferably protect driver's life security.
（2）Automobile B-column of the present invention is by the special designing to unit cell structure, compared to general negative poisson's ratio material,
One group of concentration support is only generated, surrounding material is all drawn close to most intermediate, although can also concentrate resistance Percussion counter-force, is formed
Speed is slower, and after intermediate materials gradually fill up, material in the outer part can not continue to draw close, and participates in energy-absorbing, results on the outside
The ability to bear of material is lower, in the connection of two neighboring unit cell space in this structural collision endergonic process that the present invention designs
Place will form multiple groups and concentrate support, can disperse Percussion counter-force, and the material near the support of every group of concentration is to respective concentration
Support is drawn close, and speed that can be most fast reaches one kind efficiently to shock proof state, realizes timeliness, the energy-absorbing effect of high efficiency
Fruit.
（3）Automobile B-column provided by the invention, under the requirement for meeting intensity, crash-worthiness enhances, and weight is lighter；Meanwhile
Integral structure of the lactic acid composite material Jing Guo 3D printing can be directly used in infinitesimal born of the same parents' filled layer inside the automobile B-column,
It substantially reduces production cost, improve production efficiency.
（4）The present invention fills infinitesimal born of the same parents' filled layer inside B column, because there are a large amount of holes inside it, it will outside to automobile
The noise that portion is transmitted generates " the sound forbidden band " in certain frequency, plays the role of noise reduction according to " band gap " principle, increases traveling
Comfort.
Detailed description of the invention
Fig. 1 is the three-dimensional model diagram of B-pillar structure of the present invention.
Fig. 2 is the structural schematic diagram of infinitesimal born of the same parents filled layer of the present invention.
Fig. 3 is the main view of infinitesimal born of the same parents filled layer of the present invention.
Fig. 4 be invention unit cell space in X to the schematic diagram arranged with Y-direction.
Fig. 5 is the overall structure diagram of invention unit cell space.
Fig. 6 is the main view of invention unit cell space.
Fig. 7 is infinitesimal born of the same parents filled layer deformation process figure in two-dimensional surface during collision impact.
Fig. 8 is the present invention and hexagonal honeycomb structure absorption cell collision initial spike comparison diagram.
Specific embodiment
To enable those skilled in the art to better understand technical solution of the present invention and its advantage, with reference to the accompanying drawing
The application is described in detail, but is not intended to limit the scope of protection of the present invention.
Referring to Fig.1, a kind of achievable multi-axial cord provided by the invention concentrates the automobile B-column of energy-absorbing, including：B column outside plate 1,
Infinitesimal born of the same parents filled layer 2, B column inner panel 3；Wherein, the B column outside plate 1 is arranged in outermost；The infinitesimal born of the same parents filled layer 2 is arranged in B
Among column outside plate 1 and B column inner panel 3；The B column inner panel 3 is arranged in most inner side, B column outside plate 1, infinitesimal born of the same parents filled layer 2, B column inner panel
3, by bonding connection, form sandwich structure.
Referring to Fig. 2, Fig. 3, the infinitesimal born of the same parents filled layer 2 be from multiple unit cell spaces X to be arranged successively in Y-direction
The stereochemical structure being composed；
Referring to fig. 4 to fig. 6, the unit cell space is connected and composed by two symmetrical subelement born of the same parents A；The subelement born of the same parents A packet
It includes：Power transmission portion 4, the first vertical energy-absorbing portion 5, second the 7, second lateral energy-absorbing portion of vertical the 6, first lateral energy-absorbing of energy-absorbing portion portion 8；Institute
It states 4 one end of power transmission portion to connect by first level force transmitting board 9 with the first vertical energy-absorbing portion 5, the other end and the first lateral energy-absorbing portion 7
Connection, the angle between power transmission portion 4 and the first lateral energy-absorbing portion 7 is 50-70 °, and preferably 60 °, the length in power transmission portion is 15-
18mm；The first vertical energy-absorbing portion 5 is connect with the second vertical energy-absorbing portion 6, the first vertical energy-absorbing portion 5 and the second vertical energy-absorbing portion
Angle between 6 is 135-165 °, preferably 150 °；Described first lateral energy-absorbing portion 7 and the second lateral energy-absorbing portion 8 pass through second
Horizontal force transmitting board 10 connects, and the second horizontal force transmitting board 10 is consistent with the outer surface length of first level force transmitting board 9, is 2-4mm, the
Two horizontal force transmitting boards 10 are connect with the first level force transmitting board 9 of another unit cell space, are sequentially connected unit cell space in Y-direction；
Angle between described first lateral energy-absorbing portion 7 and the second horizontal force transmitting board 10 is 150 ° -160 °, preferably 150 °；Described
Angle between two lateral energy-absorbing portions 8 and the second horizontal force transmitting board 10 is 150 ° -160 °, preferably 150 °, the second lateral energy-absorbing
The other end in portion 8 is connect with the second vertical energy-absorbing portion 6；It is processed in the outer surface of 7 connecting pin of power transmission portion 4 and the first lateral energy-absorbing portion
There is connection buffer table 11, is machined with connection the second lateral energy-absorbing portion 8 is same as the outer surface of the second vertical 6 connecting pin of energy-absorbing portion
Buffer table 11 is connected symmetrical two subelement born of the same parents by connection buffer table 11, at the same by each unit cell space in X to successively
Connection.
Infinitesimal born of the same parents filled layer of the present invention is the integral structure using lactic acid composite material Jing Guo 3D printing, structure
At the power transmission portion on unit cell space in infinitesimal born of the same parents' filled layer, the first vertical energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing
Portion, the second lateral energy-absorbing portion, first level force transmitting board are identical as the wall thickness of the second horizontal force transmitting board；And the first lateral energy-absorbing portion,
Second lateral energy-absorbing portion, the first vertical energy-absorbing portion are identical as the length in the second vertical energy-absorbing portion.
Unit cell space of the invention is designed to above structure, and unit cell space stress deformation can be made to stablize, and power transmission effect is good,
And the automobile B-column, 2 thickness of intermediate infinitesimal born of the same parents filled layer are thicker, and the number of plies of receiving is more, and energy-absorbing effect is better, still
The number of plies is more, is not only limited by space, but also B-pillar structure is heavier, this is the game of lightweight and safety, because using more born of the same parents
The filling of material is bound to lighten in the case where original other conditions remain unchanged, therefore we can guarantee former automobile
Under the premise of B column weight, in the case where inner space allows, adds the number of plies as much as possible, improve energy absorption.According to existing vapour
From the point of view of the inner space situation of vehicle B column, unit cell space is 4-15 layers in the number of plies of Y-direction in general control infinitesimal born of the same parents filled layer 2, most
It is well 6-10 layers.
Automobile B-column of the present invention, infinitesimal born of the same parents filled layer 2 are lactic acid composite material, green under proof strength requirement
Colour circle is protected, degradable, and materials are extensive, from crops, experiments verify that：Polylactic acid is mixed with basalt fibre by each 50%
When, basalt fibre is staple fiber, and intensity reaches highest.
Referring to Fig. 7, according to the deformation process in two-dimensional surface during collision impact of infinitesimal born of the same parents filled layer 2, it can be seen that
The cell wall of unit cell space（First lateral energy-absorbing portion, the second lateral energy-absorbing portion, the first vertical energy-absorbing portion, the second vertical energy-absorbing portion）By
Aperture sections are gradually filled with, aperture sections are exactly so-called energy-absorbing space, and the deformation for unit cell structure provides steric requirements,
To absorb more energy；Furthermore, it is possible to observe that the structure has the negative poisson's ratio phenomenon that distribution is concentrated, in collision impact
In the process, material does not extend around, only deforms in compression direction, is to generate one group of collection compared to general negative poisson's ratio material
Middle support, i.e. surrounding material are all drawn close to most intermediate, although can also concentrate resistance Percussion counter-force, formation speed is slower, to
After intermediate materials gradually fill up, material in the outer part can not continue to draw close, and participate in energy-absorbing, result in the receiving energy of material on the outside
Power is lower, and this structure that the present invention designs forms five groups of concentration supports, can disperse Percussion counter-force, support in every group of concentration
Neighbouring material is drawn close to the support of respective concentration, and can be most fast reach is a kind of efficiently to shock proof state, is realized timely
The energy-absorbing effect of property, high efficiency.Simultaneously as the Negative poisson's ratio that this distribution is concentrated, so that in impact process, it is adjoint
One section long and steady of stress plateau area, endergonic process is more steady, and energy absorption also increases significantly, and later period presentation the more is pressed the more hard,
This also ensures that the rigidity condition of automobile B-column, is unlikely to be damaged.The present invention will guarantee automobile B by reasonably designing
Under conditions of column stiffness and intensity, more collision energies are absorbed as far as possible, on the one hand protect the safety of driver, another party
Face also reduces the extent of the destruction of automobile B-column.
Working principle：
When automobile is by side impact, the infinitesimal born of the same parents filled layer 2 inside B column will be compressed, on unit cell space each energy-absorbing portion by
The gradually aperture sections around filling carry out absorption loss to collision energy using deformation；Simultaneously as unit cell structure is negative
Effects of Poisson's ratio, material do not extend around, and the material near the support of every group of concentration is supported to respective concentrations to be drawn close, can be with
Most fast reaching is a kind of efficiently to shock proof state, realizes the energy-absorbing effect of timeliness, high efficiency；Meanwhile in impact process
It will form one section of steady and long land regions, be held essentially constant in the regional stress value, form a platform, platform area is got over
Long, the area surrounded is bigger, and absorption energy is more, effective protection driver's life security；Platform area fluctuation is smaller, and energy is inhaled
Receipts process is more stable.In addition, the present invention makes the platform in stress-strain diagram by the geometric dimension of rational design unit cell space
Area that is, under the premise of guaranteeing driver's life security, absorbs energy as much as possible, has crossed after platform area close to limit value
Compact zone will be entered, material the more is pressed the more real, the more presses the more hard, guarantees B column stiffness, reduces the extent of the destruction to B column, at this time impact energy
Amount is also absorbed consumption substantially.
Performance detection：
According to existing impact test, the automobile B-column of the application is same as the present application with inner panel with B column outside plate, and centre is provided with
The automobile B-column of regular hexagon honeycomb energy absorbing structure identical with the application height and the number of plies compares.
As a result：From figure 8, it is seen that the present invention can substantially reduce the collision initial peak of regular hexagon honeycomb energy absorbing structure
Value, and increase platform area in the case where plateau stress is approximately equal, energy-absorbing enhancing reduces and impacts to human body bring
Power protects the safety of driver.
Claims (5)
1. a kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing, including：B column outside plate, infinitesimal born of the same parents filled layer, B column inner panel；Institute
B column outside plate is stated to be arranged in outermost；The infinitesimal born of the same parents filled layer is arranged among B column outside plate and B column inner panel；The B column inner panel
It is arranged in most inner side；It is characterized in that, the infinitesimal born of the same parents filled layer be from multiple unit cell spaces X to be arranged successively in Y-direction
The stereochemical structure being composed；
The unit cell space is connected and composed by two symmetrical subelement born of the same parents；The subelement born of the same parents include：Power transmission portion, first are erected
To energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing portion, the second lateral energy-absorbing portion；Power transmission portion one end passes through first
Horizontal force transmitting board is connect with the first vertical energy-absorbing portion, and the other end is connect with the first lateral energy-absorbing portion, and power transmission portion is laterally inhaled with first
Angle between energy portion is acute angle；The first vertical energy-absorbing portion is connect with the second vertical energy-absorbing portion, the first vertical energy-absorbing portion with
Angle between second vertical energy-absorbing portion is 135-165 °；Described first lateral energy-absorbing portion passes through second with the second lateral energy-absorbing portion
Horizontal force transmitting board connection, the second horizontal force transmitting board is consistent with the outer surface length of first level force transmitting board, the second horizontal force transmitting board
It is connect with the first level force transmitting board of another unit cell space, is sequentially connected unit cell space in Y-direction；Described first lateral energy-absorbing
Angle between portion and the second horizontal force transmitting board is 150 ° -160 °；The second lateral energy-absorbing portion and the second horizontal force transmitting board it
Between angle be 150 ° -160 °, the other end in the second lateral energy-absorbing portion is connect with the second vertical energy-absorbing portion, angle between the two
For acute angle；It is machined with connection buffer table in power transmission portion and the outer surface of the first lateral energy-absorbing portion connecting pin, in the second lateral energy-absorbing
Portion is same as the outer surface of the second vertical energy-absorbing portion connecting pin to be machined with connection buffer table, by connecting buffer table for symmetrical two
A subelement born of the same parents connection, at the same by each unit cell space in X to being sequentially connected.
2. the automobile B-column that a kind of achievable multi-axial cord according to claim 1 concentrates energy-absorbing, which is characterized in that described
Infinitesimal born of the same parents' filled layer is the integral structure of 3D printing, constitutes power transmission portion in infinitesimal born of the same parents filled layer on unit cell space, first perpendicular
To energy-absorbing portion, the second vertical energy-absorbing portion, the first lateral energy-absorbing portion, the second lateral energy-absorbing portion, first level force transmitting board and the second water
The wall thickness of flat force transmitting board is identical；And the first lateral energy-absorbing portion, the second lateral energy-absorbing portion, the first vertical energy-absorbing portion vertical are inhaled with second
The length in energy portion is identical, and the length in the power transmission portion is 15-18mm；The length of the second horizontal force transmitting board is 2-4mm.
3. the automobile B-column that a kind of achievable multi-axial cord according to claim 1 concentrates energy-absorbing, which is characterized in that described
Infinitesimal born of the same parents' filled layer uses integral structure of the lactic acid composite material Jing Guo 3D printing.
4. the automobile B-column that a kind of achievable multi-axial cord according to claim 2 concentrates energy-absorbing, which is characterized in that described the
Angle between one vertical energy-absorbing portion and the second vertical energy-absorbing portion is 150 °, the described first lateral energy-absorbing portion and the second horizontal power transmission
Angle between plate is 150 °；Angle between described second lateral energy-absorbing portion and the second horizontal force transmitting board is 150 °, power transmission portion
Angle between the first lateral energy-absorbing portion is 50-70 °.
5. the automobile B-column that a kind of achievable multi-axial cord according to claim 3 concentrates energy-absorbing, which is characterized in that described poly-
Lactic acid composite is the mixture that polylactic acid and basalt fibre press each 50%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810699453.6A CN108820049B (en) | 2018-06-29 | 2018-06-29 | A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing |
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| CN201810699453.6A CN108820049B (en) | 2018-06-29 | 2018-06-29 | A kind of achievable multi-axial cord concentrates the automobile B-column of energy-absorbing |
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| CN108820049B CN108820049B (en) | 2019-09-24 |
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| CN110645298A (en) * | 2019-09-17 | 2020-01-03 | 吉林大学 | Double-platform filling structure with double protection |
| CN110837674A (en) * | 2019-10-29 | 2020-02-25 | 南京航空航天大学 | Automobile B column based on negative Poisson ratio structure and optimization method thereof |
| CN111361630A (en) * | 2020-03-19 | 2020-07-03 | 大连理工大学 | Automobile crumple type energy-absorbing steering column with gradient multi-cell structure |
| CN112277311A (en) * | 2019-12-06 | 2021-01-29 | 同济大学 | 3D printing method and application of negative Poisson ratio honeycomb type composite energy-absorbing material |
| CN115596793A (en) * | 2022-09-13 | 2023-01-13 | 武汉科技大学（Cn） | Negative Poisson's ratio honeycomb metamaterial with multi-step deformation effect |
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