CN110015255B - Energy absorption box with star-shaped cell structure and automobile bumper - Google Patents
Energy absorption box with star-shaped cell structure and automobile bumper Download PDFInfo
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- CN110015255B CN110015255B CN201910348306.9A CN201910348306A CN110015255B CN 110015255 B CN110015255 B CN 110015255B CN 201910348306 A CN201910348306 A CN 201910348306A CN 110015255 B CN110015255 B CN 110015255B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R19/34—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means destroyed upon impact, e.g. one-shot type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/24—Arrangements for mounting bumpers on vehicles
- B60R19/26—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means
- B60R2019/264—Arrangements for mounting bumpers on vehicles comprising yieldable mounting means using cellular structures
Abstract
The invention provides an energy absorption box of a star-shaped cell structure, which is characterized by comprising: rigid plate and star cell body, star cell body includes a plurality of star cell units, a plurality of first connector and a plurality of second connector, star cell unit is perpendicular with the rigid plate, including four star subunits, four star subunits connect in order and surround and form square structure, star subunit includes a four-angle star shape and four connecting pieces, two adjacent connecting pieces are mutually perpendicular, link together through oval pipe between two adjacent star cell units, on the plane direction that is parallel with the rigid plate, link together through the ellipsoid between two adjacent star cell units. The invention also provides an automobile bumper with the energy absorption box of the star-shaped cellular structure.
Description
Technical Field
The invention belongs to the field of automobile bumpers, and particularly relates to an energy absorption box with a star-shaped cell structure and an automobile bumper.
Background
With the development of society and the improvement of living standard of people, automobiles become necessities of a plurality of families. Among the automobile parts, the function of the automobile bumper is particularly prominent.
The bumper of the automobile is a safety device which absorbs and slows down the external impact force and protects the front part and the rear part of the automobile body. When collision happens, the bumper can protect the automobile body and avoid the automobile body from direct collision. The protective effect can be achieved by dispersing the impact force for low-speed collision; for the impact with higher speed, the energy absorption effect is limited, the bumper directly transmits the impact force to the automobile, and the protection effect of the automobile is limited.
The front collision energy absorption system of the automobile consists of an anti-collision beam, an energy absorption box and a front longitudinal beam, wherein the anti-collision beam has the main functions of uniformly transmitting collision energy and protecting main parts such as an engine, and the energy absorption box is positioned between the front longitudinal beam and the anti-collision beam, has lower strength relative to the front longitudinal beam, is firstly deformed in the collision process and plays a main role in medium-low speed collision.
The traditional energy absorption box is of a thin-wall structure, a double-arrow-head type cell structure shown in fig. 9 is generally adopted, and the structure is triangular, so that the structure is stressed stably, but stress concentration is easily generated at a sharp corner part, and meanwhile, due to the triangular structure type, the stress cannot be uniform, and the flexibility of the interior is poor.
The cell structure of the double-headed arrow type is selected for parameter example, the test parameters of the cell structure model of the double-headed arrow type are shown in the table 1,
table 1 data results table
However, the energy absorption box of the conventional thin-wall double-arrow-head type cell structure has the problems of heavy mass and small absorbed energy.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a crash box having a star-shaped cell structure and an automobile bumper.
The invention provides an energy absorption box of a star-shaped cell structure, which is characterized by comprising the following components: two rigid plates arranged in parallel; and a star cell unit arranged between the two rigid plates and having a negative Poisson ratio structure, wherein the star cell unit is perpendicular to the rigid plates and comprises four star subunits, the four star subunits are sequentially connected and enclosed to form a square structure, the star subunit comprises a regular tetragonal star and four connecting members, the four connecting members respectively extend outwards from the angular bisector of the connection of the four corners of the regular tetragonal star, the connecting members and the regular tetragonal star are in the same plane, the two adjacent connecting members are perpendicular to each other, the plurality of star cell units are arranged in a matrix form of rows and columns in the plane direction parallel to the rigid plates and are sequentially connected in a contact manner and are sequentially connected in the direction perpendicular to the rigid plates, and forming a rectangular parallelepiped structure, wherein the first connecting body is an elliptical tube, the second connecting body is an elliptical body, two adjacent star-shaped cell units are connected together through the elliptical tube in the direction perpendicular to the rigid plate, the extending direction of the elliptical tube is parallel to the rigid plate, two adjacent star-shaped cell units are connected together through the elliptical body in the plane direction parallel to the rigid plate, the elliptical body comprises four identical arc-shaped bodies, the arc-shaped bodies are formed by cutting four corners of the 1/2 elliptical tube, and the four arc-shaped bodies are connected and surrounded at one time to form a closed structure.
The energy absorption box of the star-shaped cell structure provided by the invention can also have the following characteristics: wherein, four outer corners of the regular quadrangle star-shaped piece are fillets.
The energy absorption box of the star-shaped cell structure provided by the invention can also have the following characteristics: wherein, four internal angles of the regular quadrangle star-shaped piece are smooth curved surfaces.
The energy absorption box of the star-shaped cell structure provided by the invention can also have the following characteristics: wherein, the one end that is connected with positive four corners star-shaped member of connecting piece is the sharp horn shape, and the tip that the connecting piece is connected with first connector and second connector respectively is circular-arc smooth curved surface.
The energy absorption box of the star-shaped cell structure provided by the invention can also have the following characteristics: the front view and the side view of the star-shaped cell body are consistent in shape, the top view is a square grid, when external pressure is applied, the star-shaped cell body generates an inward contraction effect, and when external tension is applied, the expansion property is generated.
The present invention provides an automobile bumper having the features comprising: the energy absorption box is characterized by comprising two frame cross beams and two frame longitudinal beams which are arranged in parallel, and an energy absorption box of a star-shaped cellular structure arranged between the frame cross beams and the frame longitudinal beams, wherein the energy absorption box of the star-shaped cellular structure is the energy absorption box of any one of the star-shaped cellular structures.
Action and Effect of the invention
According to the energy absorption box with the star-shaped cell structure, the energy absorption box comprises a plurality of star-shaped cell units, a plurality of first connecting bodies and a plurality of second connecting bodies, the star-shaped cell units are arranged in a dot matrix form and are sequentially connected, the star-shaped cell units are perpendicular to the rigid plate and comprise four star-shaped sub units, the four star-shaped sub units are sequentially connected and enclosed to form a square structure, and the star-shaped sub units comprise a four-angle star-shaped piece and four connecting pieces, so that the energy absorption box is light in weight and high in elasticity, and further has remarkable advantages when being applied to automobile bumpers.
In addition, the four connecting pieces of the star-shaped subunit extend outwards from the angle bisector of the connection position of the four corners of the regular four-corner star-shaped piece respectively, the connecting pieces and the regular four-corner star-shaped piece are positioned in the same plane, and the two adjacent connecting pieces are perpendicular to each other, so that the vertical structure of the star-shaped subunit has structural stability.
In addition, the star-shaped cell units are arranged in a matrix form of rows and columns in the plane direction parallel to the rigid plate and are sequentially connected in contact with each other, and are sequentially connected in contact with each other in the direction perpendicular to the rigid plate to form a rectangular parallelepiped structure.
In addition, because the first connecting body is an elliptical tube, the second connecting body is an elliptical body, two adjacent star-shaped cell units are connected together through the elliptical tube in the direction perpendicular to the rigid plate, the extending direction of the elliptical tube is parallel to the rigid plate, and the external acting force mainly comes from the direction perpendicular to the long axis of the elliptical tube, and the long axis position of the elliptical tube is taken as the main stress position, the deformation stress characteristic of the elliptical tube can be fully exerted, and more energy can be absorbed under the condition of overall slow deformation.
In addition, in the plane direction parallel to the rigid plate, two adjacent star-shaped cell units are connected together through an ellipsoid, the ellipsoid comprises four identical arc-shaped bodies, the arc-shaped bodies are formed by cutting off four corners of an 1/2 elliptical tube, the four arc-shaped bodies are connected and enclosed at one time to form a closed structure, the characteristic of stable stress of the ellipsoid can be fully exerted because the distortion force is mainly borne at the position, and the ellipsoid structure is taken as a main stress position, so that the structure of the ellipsoid can be kept in a stable state to the maximum extent.
In addition, because the negative poisson ratio structure can generate a radial contraction effect when an object with the negative poisson ratio structure is subjected to pressure, and the negative poisson ratio structure can generate a longitudinal expansion property when the object with the negative poisson ratio structure is subjected to tension, the energy absorption box of the star-shaped cell structure has the effect of radially protecting other members from being extruded and longitudinally absorbing more energy.
According to the automobile bumper, the two frame cross beams and the frame longitudinal beams which are arranged in parallel, and the energy absorption boxes of the star-shaped cellular structure are arranged between the cross beams and the frame longitudinal beams, so that external acting force can be uniformly distributed by the bumper through the frame cross beams and the frame longitudinal beams, the energy absorption boxes can uniformly absorb the external acting force, and the energy absorption effect of the bumper is improved.
Drawings
FIG. 1 is a schematic view of a bumper of an automobile in an embodiment of the invention;
FIG. 2 is a schematic structural diagram of an energy absorption box of a star-cell structure in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a star cell unit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a star subunit in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the formation of a four-pointed star in an embodiment of the present invention;
FIG. 6 is a schematic illustration of the formation of a connection in an embodiment of the invention;
fig. 7 is a schematic structural view of a first connecting body in an embodiment of the invention;
FIG. 8 is a schematic structural view of a second connecting body in an embodiment of the present invention; and
fig. 9 is a schematic structural diagram of a double-headed cell according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement objects and the effects of the invention easy to understand, the following embodiments are provided to specifically describe the energy absorption box and the automobile bumper of the star-shaped cell structure in combination with the accompanying drawings.
Fig. 1 is a schematic structural view of an automobile bumper in an embodiment of the invention.
As shown in fig. 1, the bumper 100 of the present embodiment includes a cross member 11, a side member 12, and a crash box 13 of a star-cell structure.
The frame cross beam 11 and the frame longitudinal beam 12 are arranged in parallel relatively, and the energy absorption box 13 in a star-shaped cellular structure is arranged between the frame cross beam 11 and the frame longitudinal beam 12 and is respectively contacted and connected with the frame cross beam 11 and the frame longitudinal beam 12.
FIG. 2 is a schematic structural diagram of an energy absorption box of a star-cell structure in an embodiment of the present invention.
As shown in fig. 2, the energy absorption box 13 of the star cell structure in this embodiment includes a first rigid plate 131, a second rigid plate 132, and a star cell 133.
The first rigid plate 131 and the second rigid plate 132 are disposed in parallel with each other, and the star cell 133 is disposed between the first rigid plate 131 and the second rigid plate 132, and is in contact with and connected to the first rigid plate 131 and the second rigid plate 132, respectively.
The starcell unit 133 includes a plurality of starcell units 1331, a plurality of first connectors 1332 and a plurality of second connectors 1333, wherein the starcell units 1331 are perpendicular to the first rigid plate 131, arranged in a matrix and connected in sequence, and the starcell unit 133 includes at least one starcell unit 1331. In the present embodiment, the number of the star cell units 1331 is 54.
Fig. 3 is a schematic structural diagram of a star-cell unit according to an embodiment of the present invention.
As shown in fig. 3, the star cell unit 1331 includes four star subunits 13311, and the four star subunits 13311 are sequentially connected to form a square structure.
FIG. 4 is a schematic structural diagram of a star subunit in an embodiment of the present invention.
As shown in FIG. 4, the star subunit 13311 includes a four-pointed star 133111 and four connectors 133112.
FIG. 5 is a schematic diagram of the formation of a four-pointed star in an embodiment of the present invention.
As shown in fig. 5, the four-pointed star 133111 is drawn with two closed four-pointed star patterns a and B as outlines and with a direction perpendicular to a plane formed by the four-pointed star patterns a and B as a drawing direction, thereby forming a four-pointed star 133111.
Wherein, four inner angles that are the acute angle of four corners star figure A are the fillet, and four inner angles that are the acute angle of four corners star figure B connect through the U-shaped line.
Four connecting members 133112 extend outwardly from bisectors of the four corner joints of the four corner star 133111, respectively, and connecting member 133112 is in the same plane as the four corner star 133111, with two adjacent connecting members being perpendicular to each other.
Fig. 6 is a schematic diagram of the formation of a connector in an embodiment of the invention.
As shown in fig. 6, the connecting member 133112 is formed by stretching in a direction perpendicular to the plane of the contour line C.
Wherein, two endpoints of one end of the first rod part and the second rod part which are parallel and equal are connected through a circular arc line, and two endpoints of the other end are connected through a V-shaped line to form a closed figure contour line C of the same plane.
The arc surface of the connecting piece 133112 matches with the curved surface of the first connecting body 1332 or the second connecting body 1333, and the V-shaped end of the connecting piece matches with the corner connection of the four-corner star-shaped piece 133111.
The two adjacent star-shaped sub-units 13311 of the star-shaped cell unit 1331 are connected together by the connecting members 133112 adjacent to each other in a vertical connection.
The vertical connection position is an edge of the connecting piece 133112 which is in contact connection, and the arc surfaces of two adjacent connecting pieces 133112 after vertical connection can form a smooth curved surface.
The plurality of star-shaped cell units 1331 are arranged in a matrix of rows and columns in a planar direction parallel to the first rigid plate 131, and are sequentially connected in contact with each other in a direction perpendicular to the first rigid plate 131, thereby forming a rectangular parallelepiped structure.
Fig. 7 is a schematic structural view of the first connecting body in the embodiment of the present invention.
As shown in fig. 7, the first connecting body 1332 is an elliptical tube, and two adjacent star-shaped cell units 1331 are connected together by the elliptical tube in a direction perpendicular to the first rigid plate 131, and the elliptical tube is matched with and connected to the arc surface of the connecting piece 133112. The elliptical tube extends in a direction parallel to the first rigid plate 131.
Fig. 8 is a schematic structural view of a second connecting body in an embodiment of the present invention.
As shown in fig. 8, the second connecting body 1333 is an ellipsoid and includes four arc-shaped bodies 13331, the four arc-shaped bodies 13331 are sequentially connected and enclosed to form an ellipsoid, adjacent star-shaped cell units 1331 are connected together by an ellipsoid in the plane direction parallel to the first rigid plate 131, and the ellipsoid is matched and connected with the smooth curved surface formed by the two connecting pieces 133112.
Wherein the arc 13331 is cut from the long axis of the oval tube to form two first tiles and second tiles with the same shape, the first tile has four parallel straight lines, which are the first straight line, the second straight line, the third straight line and the fourth straight line, the midpoint of the first straight line and the midpoint of the fourth straight line are connected to form a fifth straight line, the fifth straight line is parallel to the long axis of the oval tube, the first straight line, the second straight line, the third straight line and the fourth straight line form a first plane, the vertical plane of the first plane is called a second plane, the intersecting line of the first plane and the second plane is the first straight line, the sixth straight line is perpendicular to the fifth straight line on the second plane through the midpoint of the first straight line, the two rays are made in the second plane with the midpoint of the first straight line as the intersecting point, the included angle between the ray and the sixth straight line is 45 degrees, the two rays are used as cutting lines to cut in the first plane, an arc 13331 is obtained.
Under the same conditions, the energy absorption box of the star-shaped cell structure in the present embodiment and the energy absorption box of the thin-walled double-arrowhead cell structure in the prior art were tested for the following parameters, as shown in table 2,
table 2 data results table
Through experimental verification, the mass and the energy absorption value of the energy absorption box with the star-shaped cell structure and the energy absorption box with the thin-wall double-arrow-head cell structure in the prior art are compared, and the following conclusion is obtained:
(1) the star-shaped cell structure has lighter weight, and the energy absorption effect of the star-shaped cell structure is better under the same condition.
(2) The star-shaped cell structure has lighter weight, can save more materials, reduce the motion inertia and save energy.
Effects and effects of the embodiments
According to the energy absorption box with the star-shaped cell structure, the energy absorption box comprises a plurality of star-shaped cell units, a plurality of first connecting bodies and a plurality of second connecting bodies, the star-shaped cell units are arranged in a dot matrix form and are sequentially connected, the star-shaped cell units are perpendicular to the rigid plate and comprise four star-shaped sub units, the four star-shaped sub units are sequentially connected and enclosed to form a square structure, and the star-shaped sub units comprise a four-angle star-shaped piece and four connecting pieces, so that the energy absorption box is light in weight and high in elasticity, and further has remarkable advantages when being applied to automobile bumpers.
In addition, the four connecting pieces of the star-shaped subunit extend outwards from the angle bisector of the connection position of the four corners of the regular four-corner star-shaped piece respectively, the connecting pieces and the regular four-corner star-shaped piece are positioned in the same plane, and the two adjacent connecting pieces are perpendicular to each other, so that the vertical structure of the star-shaped subunit has structural stability.
In addition, the star-shaped cell units are arranged in a matrix form of rows and columns in the plane direction parallel to the rigid plate and are sequentially connected in contact with each other, and are sequentially connected in contact with each other in the direction perpendicular to the rigid plate to form a rectangular parallelepiped structure.
In addition, because the first connecting body is an elliptical tube, the second connecting body is an elliptical body, two adjacent star-shaped cell units are connected together through the elliptical tube in the direction perpendicular to the rigid plate, the extending direction of the elliptical tube is parallel to the rigid plate, and the external acting force mainly comes from the direction perpendicular to the long axis of the elliptical tube, and the long axis position of the elliptical tube is taken as the main stress position, the deformation stress characteristic of the elliptical tube can be fully exerted, and more energy can be absorbed under the condition of overall slow deformation.
In addition, in the plane direction parallel to the rigid plate, two adjacent star-shaped cell units are connected together through an ellipsoid, the ellipsoid comprises four identical arc-shaped bodies, the arc-shaped bodies are formed by cutting off four corners of an 1/2 elliptical tube, the four arc-shaped bodies are connected and enclosed at one time to form a closed structure, the characteristic of stable stress of the ellipsoid can be fully exerted because the distortion force is mainly borne at the position, and the ellipsoid structure is taken as a main stress position, so that the structure of the ellipsoid can be kept in a stable state to the maximum extent.
In addition, because the negative poisson ratio structure can generate a radial contraction effect when an object with the negative poisson ratio structure is subjected to pressure, and the negative poisson ratio structure can generate a longitudinal expansion property when the object with the negative poisson ratio structure is subjected to tension, the energy absorption box of the star-shaped cell structure has the effect of radially protecting other members from being extruded and longitudinally absorbing more energy.
According to the automobile bumper, the two frame cross beams and the frame longitudinal beams which are arranged in parallel, and the energy absorption boxes of the star-shaped cell structure are arranged between the cross beams and the frame longitudinal beams, so that the bumper can evenly distribute external acting force through the frame cross beams and the frame longitudinal beams, the energy absorption boxes can evenly absorb the external acting force, and the energy absorption effect of the bumper is improved.
Furthermore, because the four outer corners of the four-corner star-shaped piece which are acute angles are rounded corners, the stress of the four-corner star-shaped piece is more uniform, and the phenomenon of stress concentration is prevented.
Furthermore, the increased flexibility is achieved because the four acute interior corners of the four-pointed star are connected by a U-shaped curve.
Furthermore, because one end of the connecting piece, which is connected with the four-corner star-shaped piece, is in a sharp-corner shape, the connecting piece and the four-corner star-shaped piece can form a clamping groove, so that the stability of a fixing mode is ensured; because the connecting piece is respectively connected with the first connecting body and the second connecting body, the end part is an arc-shaped smooth curved surface, so that the connecting piece can be completely tightly connected with the first connecting body and the second connecting body, and the stability of a fixing mode is ensured.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
For example, in the above embodiment, the star cell unit is formed by scanning and stretching, but in practical application, the star cell unit may also be formed by 3D printing.
Claims (4)
1. A kind of energy-absorbing box of the star-shaped cellular structure, characterized by that, comprising:
two rigid plates arranged in parallel; and
the star-shaped cell unit is arranged between the two rigid plates, is of a negative Poisson ratio structure and comprises a plurality of star-shaped cell unit units, a plurality of first connecting bodies and a plurality of second connecting bodies, the star-shaped cell unit units are arranged in a dot matrix form and are connected in sequence,
wherein the star cell unit is perpendicular to the rigid plate and comprises four star subunits which are sequentially connected and surrounded to form a square structure,
the star subunit comprises a four-pointed star and four connectors,
four connecting pieces extend outwards from angular bisectors of the joints of the four corners of the four-corner star-shaped piece respectively, the connecting pieces and the four-corner star-shaped piece are positioned in the same plane, two adjacent connecting pieces are perpendicular to each other,
the star-shaped cell units are arranged in a matrix form of rows and columns in the plane direction parallel to the rigid plate and are sequentially connected in a contact manner, and are sequentially connected in a contact manner in the direction vertical to the rigid plate to form a rectangular parallelepiped structure,
the first connector is an elliptical tube, the second connector is an elliptical body,
in the direction perpendicular to the rigid plate, two adjacent star-shaped cell units are connected together through the elliptical tubes, the extending direction of the elliptical tubes is parallel to the rigid plate,
in the plane direction parallel to the rigid plate, two adjacent star-shaped cell units are connected together through the ellipsoids,
the ellipsoid comprises four identical arc-shaped bodies, the arc-shaped bodies are formed by cutting off four corners of an 1/2 elliptic tube, the four arc-shaped bodies are sequentially connected and enclosed to form a closed structure,
one end of the connecting piece connected with the star-shaped pieces at the four corners is in a sharp-cornered shape, the connecting piece and the star-shaped pieces at the four corners form a clamping groove,
the end parts of the connecting pieces, which are respectively connected with the first connecting body and the second connecting body, are arc-shaped smooth curved surfaces.
2. The energy absorption box of the star-cell structure as claimed in claim 1, wherein:
wherein, four corners of the four-corner star-shaped piece are all round corners.
3. The energy absorption box of the star-cell structure as claimed in claim 1, wherein:
the front view and the side view of the star-shaped cell body are consistent in shape, and the top view is a square grid.
4. An automobile bumper, comprising:
two frame cross beams and frame longitudinal beams which are arranged in parallel, an energy absorption box which is arranged between the cross beams and the frame longitudinal beams and has a star-shaped cellular structure,
wherein the energy absorption box of the star-shaped cell structure is the energy absorption box of the star-shaped cell structure as claimed in any one of claims 1 to 3.
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| CN201910348306.9A CN110015255B (en) | 2019-04-28 | 2019-04-28 | Energy absorption box with star-shaped cell structure and automobile bumper |
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| CN111969327B (en) * | 2020-08-21 | 2021-10-15 | 北京化工大学 | Deformation-designable and non-contact-controllable two-dimensional mechanical metamaterial |
| CN115030303B (en) * | 2022-06-20 | 2023-03-10 | 东北大学 | Internal-locking assembled three-dimensional reentry honeycomb type negative poisson ratio three-dimensional grid |
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| EP3339677A1 (en) * | 2016-12-20 | 2018-06-27 | Airbus Operations, S.L. | Energy absorbing structure for attenuating the energy transmitted from an energy source |
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| CN110015255A (en) | 2019-07-16 |
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