Sandwich structure, floor assembly and automobile

Abstract

The utility model provides a sandwich structure, a floor assembly and an automobile. The sandwich structure comprises cell element structures arranged in the first direction. The cell structure comprises at least one cell matrix arranged along a second direction; each cell element base body comprises a cell element hole wall and an energy absorption cavity formed in the cell element hole wall, and the cell element hole wall is concaved inwards to form an inwards-concave structure with the negative Poisson's ratio effect. According to the utility model, the cell hole walls of the plurality of cell base bodies are matched with the energy absorption cavities, so that the collision force borne by the first workpiece can be effectively absorbed, and the safety performance of the first workpiece is ensured; and meanwhile, the cost of the sandwich structure can be reduced through the design of the energy absorption cavity, so that the weight cost is not excessively increased while the safety performance of the workpiece is met. The cell hole walls are recessed in the first direction to form the recessed structures with the negative Poisson's ratio effect, so that the sandwich structure has the negative Poisson's ratio effect, the vibration of the workpiece can be effectively reduced, and the modal of the workpiece is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of floor assemblies, and in particular relates to a sandwich structure, a floor assembly and a car. Background Art

[0002] At present, in order to meet the safety performance and lightweight design of the workpiece, a sandwich structure is often set on the workpiece to increase the stiffness of the workpiece, but the existing sandwich structure will increase the weight of the workpiece and cannot meet the lightweight design. For example, as an important component of the car, the floor assembly plays an important role in the realization of automobile comfort, safety and lightweight. At present, the conventional floor assembly is mainly welded by beams and panels. Its structural design is a single-layer thin plate in actual application, and there is a defect of insufficient stiffness mode. In order to improve the panel mode, the current general solution is to spray damping pads on the panel, which has the adverse consequence of increasing the weight and cost of the vehicle; at the same time, the paint shop needs to add coating stations, which makes the painting production line longer and increases the investment in production lines and personnel and equipment. Utility Model Content

[0003] The utility model provides a sandwich structure, a floor assembly and a car, so as to solve the problem that the existing sandwich structure cannot meet the safety performance of the workpiece while not excessively increasing the weight cost.

[0004] A sandwich structure includes a cell structure arranged along a first direction;

[0005] The cell structure includes at least one cell matrix arranged along the second direction;

[0006] Each of the cell substrates comprises a cell pore wall and an energy absorbing cavity arranged in the cell pore wall, and the cell pore wall is concave to form a concave structure with a negative Poisson's ratio effect.

[0007] Preferably, the cell pore wall of each of the cell matrixes includes two first cell edges, two second cell edges and two third cell edges;

[0008] The two first cell edges are arranged relatively parallel to each other;

[0009] The two ends of each of the first cell sides are respectively connected to the first end of the second cell side and the first end of the third cell side, the angle between the first cell side and the second cell side is an acute angle, and the angle between the first cell side and the third cell side is an acute angle;

[0010] The second ends of the two second cell edges are connected, and the angle between the two second cell edges is an obtuse angle;

[0011] The second ends of the two third cell edges are connected, and the angle between the two third cell edges is an obtuse angle.

[0012] Preferably, each of the cell structures comprises at least two cell bases arranged along the second direction;

[0013] Two adjacent cell bases share the first cell edge.

[0014] Preferably, in two adjacent columns of the cell structure, two adjacent cell matrices are arranged along a first direction, and a second cell edge of one cell matrix and a third cell edge of another cell matrix are shared cell edges.

[0015] Preferably, the thickness of the cell hole wall of each of the cell matrixes is 0.5-2.0 mm; the angle of each of the acute angles is 45-80°; and the cell length of the cell matrix is ​​not less than 5 mm.

[0016] A floor assembly, comprising the sandwich structure and a floor panel;

[0017] The floor panel includes an accommodation space arranged along a second direction;

[0018] The sandwich structure is arranged in the accommodating space, and is used to generate a negative Poisson's ratio effect when the floor panel is subjected to an external force.

[0019] Preferably, the floor panel comprises an upper panel and a lower panel;

[0020] The upper panel and the lower panel cooperate to form an accommodating space arranged along the second direction.

[0021] Preferably, the floor assembly further comprises a front floor beam and a rear floor beam;

[0022] The front floor cross beam and the rear floor cross beam are disposed on opposite sides of the floor panel.

[0023] Preferably, the front floor beam, the rear floor beam, the floor panel and the sandwich structure are integrally extruded.

[0024] A car comprises the floor assembly.

[0025] In the utility model, the sandwich structure is used to be arranged in the first workpiece, specifically including a cell structure arranged along the first direction, that is, a plurality of rows of cell structures are arranged along the X direction or along the Y direction; the cell structure includes at least one cell matrix arranged along the second direction, that is, at least one cell matrix is ​​arranged along the Z direction; each cell matrix includes a cell hole wall and an energy absorption cavity arranged in the cell hole wall, and the cell hole walls and the energy absorption cavity of the plurality of cell matrices cooperate to effectively absorb the collision force received by the first workpiece and ensure the safety performance of the first workpiece; at the same time, the design of the energy absorption cavity can reduce the cost of the sandwich structure, thereby achieving the safety performance of the workpiece while not excessively increasing the weight cost. The concave structure with a negative Poisson's ratio effect formed by the concave cell hole wall along the first direction makes the sandwich structure have a negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the modal state of the workpiece. For example, the sandwich structure is arranged in the floor panel of the floor assembly of the automobile. The sandwich structure has a negative Poisson's ratio effect. When the floor panel vibrates in the Z direction, the surrounding materials collapse inward, so that the local density of the floor panel is increased, thereby more effectively resisting deformation and vibration, effectively reducing the vibration of the floor panel, and improving the modal of the floor panel, so that the damping pad on the floor panel can be eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is an axonometric view of the floor assembly in the utility model;

[0027] Figure 2 yes Figure 1 A cross-sectional view of

[0028] Figure 3 yes Figure 2 A magnified view of the middle cell structure layer;

[0029] Figure 4 It is a cross-sectional view of a cell matrix in the utility model;

[0030] Figure 5 It is an assembly drawing of the floor assembly in the utility model.

[0031] Among them, 1. cell structure; 2. cell matrix; 21. cell hole wall; 211. first cell edge; 212. second cell edge; 213. third cell edge; 22. energy absorption cavity; 3. floor panel; 31. upper panel; 32. lower panel; 4. front crossbeam of floor; 5. rear crossbeam of floor. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The utility model embodiment provides a sandwich structure, referring to Figure 1-4 The sandwich structure includes a cell structure 1 arranged along a first direction; the cell structure 1 includes at least one cell matrix 2 arranged along a second direction; each cell matrix 2 includes a cell pore wall 21 and an energy absorption cavity 22 arranged in the cell pore wall 21, and the cell pore wall 21 is concave to form an inwardly concave structure with a negative Poisson's ratio effect.

[0036] The first direction and the second direction are two directions perpendicular to each other, defined by the direction of three-dimensional space, the first direction is the horizontal direction, the second direction is the vertical direction, the horizontal direction may be the X direction or the Y direction, and the vertical direction is the Z direction. For example, when the sandwich structure is applied to a workpiece of an automobile, the first direction is the vehicle X direction or the vehicle Y direction, and the second direction is the vehicle Z direction.

[0037] As an example, the sandwich structure is used to be arranged in the first workpiece, specifically including a cell structure 1 arranged along the first direction, that is, the cell structure 1 can be arranged along the X direction or along the Y direction; the cell structure 1 includes at least one cell matrix 2 arranged along the second direction, that is, at least one cell matrix 2 is arranged along the Z direction; each cell matrix 2 includes a cell hole wall 21 and an energy absorption cavity 22 arranged in the cell hole wall 21, and the cell hole walls 21 and the energy absorption cavity 22 of multiple cell matrices 2 cooperate to effectively absorb the collision force received by the first workpiece and ensure the safety performance of the first workpiece; at the same time, the design of the energy absorption cavity 22 can reduce the cost of the sandwich structure, thereby achieving the safety performance of the workpiece without excessively increasing the weight cost. The concave structure with a negative Poisson's ratio effect formed by the concave cell hole wall 21 makes the sandwich structure have a negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the workpiece mode.

[0038] For example, the sandwich structure is arranged in the floor panel 3 of the floor assembly of the automobile. The sandwich structure has a negative Poisson's ratio effect. When the floor panel 3 vibrates in the Z direction, the surrounding materials collapse inward, so that the local density of the floor panel 3 is increased, thereby more effectively resisting deformation and vibration, and effectively reducing the vibration of the floor panel 3 and improving the modal of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated.

[0039] In this example, the sandwich structure can be set on the car, specifically, it can be set in the floor panel 3 of the floor assembly of the car, and it can also be set in other structures with accommodating cavities. The sandwich structure in this example has a plurality of cell matrices 2 along the Y direction of the vehicle, and the shape, size and thickness of the cell matrix 2 and the cell hole wall 21 can be designed and adjusted according to actual needs.

[0040] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 The cell hole wall 21 of each cell matrix 2 includes two first cell edges 211, two second cell edges 212 and two third cell edges 213; the two first cell edges 211 are arranged relatively parallel; the two ends of each first cell edge 211 are respectively connected to the first end of a second cell edge 212 and the first end of a third cell edge 213, the angle between the first cell edge 211 and the second cell edge 212 is an acute angle, and the angle between the first cell edge 211 and the third cell edge 213 is an acute angle; the second ends of the two second cell edges 212 are connected, and the angle between the two second cell edges 212 is an obtuse angle; the second ends of the two third cell edges 213 are connected, and the angle between the two third cell edges 213 is an obtuse angle.

[0041] As an example, the cell hole wall 21 of each cell matrix 2 includes two first cell edges 211, two second cell edges 212 and two third cell edges 213, and the two first cell edges 211 are arranged relatively parallel; the two ends of each first cell edge 211 are respectively connected to the first end of a second cell edge 212 and the first end of a third cell edge 213, the angle between the first cell edge 211 and the second cell edge 212 is an acute angle, and the angle between the first cell edge 211 and the third cell edge 213 is an acute angle; the second ends of the two second cell edges 212 are connected, and the angle between the two second cell edges 212 is an obtuse angle; the second ends of the two third cell edges 213 are connected, and the angle between the two third cell edges 213 is an obtuse angle. In this way, the concave shape of the cell hole wall 21 of the cell matrix 2 can be designed according to actual conditions, so as to improve the energy absorption effect of the sandwich structure so that it meets the safety performance of the workpiece; multiple cell matrices 2 are matched to form a sandwich structure with a negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the workpiece mode.

[0042] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 Each cell structure 1 includes at least two cell bases 2 arranged along the second direction; two adjacent cell bases 2 share a first cell edge 211 .

[0043] As an example, each cell structure 1 includes at least two cell matrices 2 arranged along the second direction; two adjacent cell matrices 2 share a first cell edge 211. This arrangement makes the connectivity between the concave structures with negative Poisson's ratio effect in the second direction closer, thereby improving the negative Poisson's ratio effect of the sandwich structure, further reducing the vibration of the workpiece, and improving the workpiece mode.

[0044] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 In two adjacent rows of cell structures 1 , two adjacent cell bases 2 are arranged along the first direction, and the second cell edge 212 of one cell base 2 and the third cell edge 213 of another cell base 2 are shared cell edges.

[0045] As an example, in two adjacent columns of a multi-column cell structure 1, two adjacent cell matrices 2 are arranged along a first direction, and a second cell edge 212 of one cell matrix 2 and a third cell edge 213 of another cell matrix 2 are shared cell edges. This arrangement allows the cell matrices 2 of two adjacent columns of the cell structure 1 to be staggered and connected, so that the adjacent cell matrices 2 can support each other, thereby improving the stability of the sandwich structure; at the same time, the connectivity between the concave structures with a negative Poisson's ratio effect in the first direction is made tighter, thereby improving the negative Poisson's ratio effect of the sandwich structure, further reducing the vibration of the workpiece, and improving the workpiece mode.

[0046] In one embodiment, referring to Figure 2 , Figure 3 and Figure 4 The thickness of the cell hole wall 21 of each cell matrix 2 is 0.5-2.0 mm; the angle of each acute angle is 45-80°; and the cell length of the cell matrix 2 is not less than 5 mm.

[0047] As an example, the thickness of the cell hole wall 21 is t, which is generally 0.5 mm to 2.0 mm; α is the acute angle, i.e., the concave angle, which is generally set to 45 to 80°; L is the cell length of the cell matrix 2, which is generally not less than 5 mm; h is the cell height of the cell matrix 2, which is determined by the height of the first workpiece, and its relationship with the height H of the first workpiece is H=nh+(n-1)t, where n is the number of cell matrices 2 in the second direction, which is required to be ≥2; when the design data of the cell matrix 2 in the sandwich structure meets the above range, the sandwich structure has a negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the workpiece mode.

[0048] The utility model embodiment provides a floor assembly, referring to Figure 2 and Figure 3 , including a sandwich structure and a floor panel 3; the floor panel 3 includes an accommodating space arranged along the second direction; the sandwich structure is arranged in the accommodating space, and is used to generate a negative Poisson's ratio effect when the floor panel 3 is subjected to an external force.

[0049] As an example, the floor assembly includes a sandwich structure and a floor panel 3; the floor panel 3 includes a housing space arranged along the second direction; the sandwich structure is arranged in the housing space, and is used to generate a negative Poisson's ratio effect when the floor panel 3 is subjected to an external force in the second direction. The sandwich structure specifically includes a cell structure 1 arranged along the first direction, that is, the cell structure 1 can be arranged along the X direction or along the Y direction; the cell structure 1 includes at least one cell matrix 2 arranged along the second direction, that is, at least one cell matrix 2 is arranged along the Z direction. Each cell matrix 2 includes a cell hole wall 21 and an energy absorption cavity 22 arranged in the cell hole wall 21. The cell hole walls 21 and the energy absorption cavity 22 of the multiple cell matrices 2 cooperate to effectively absorb the collision force received by the first workpiece and ensure the safety performance of the first workpiece; at the same time, the design of the energy absorption cavity 22 can reduce the cost of the sandwich structure, thereby achieving the goal of satisfying the safety performance of the workpiece without excessively increasing the weight cost. The concave structure with negative Poisson's ratio effect formed by the cell hole wall 21 concave in the first direction makes the sandwich structure have negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the workpiece mode. When the workpiece is subjected to the force in the second direction or vibrates in the second direction, the surrounding materials collapse inward, so that the local density of the workpiece increases, thereby more effectively resisting deformation and vibration. For example, the sandwich structure is arranged in the floor panel 3 of the floor assembly of the automobile. The sandwich structure has a negative Poisson's ratio effect. When the floor panel 3 vibrates in the Z direction, the surrounding materials collapse inward, so that the local density of the floor panel 3 increases, thereby more effectively resisting deformation and vibration, and can effectively reduce the vibration of the floor panel 3 and improve the mode of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated.

[0050] The sandwich structure in this example has a negative Poisson's ratio effect, which can effectively reduce the vibration of the floor panel 3 and improve the modal of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated. The sandwich structure is suitable for floor assemblies, especially for models with high NVH performance requirements and lightweight requirements.

[0051] In one embodiment, referring to Figure 2 and Figure 3 The floor panel 3 includes an upper panel 31 and a lower panel 32; the upper panel 31 and the lower panel 32 cooperate to form an accommodating space arranged along the second direction.

[0052] As an example, the floor panel 3 includes an upper panel 31 and a lower panel 32; the upper panel 31 and the lower panel 32 cooperate to form a accommodating space arranged along the second direction, and the sandwich structure is arranged in the accommodating space, which is used to generate a negative Poisson's ratio effect when the floor panel 3 is subjected to an external force in the second direction, which can effectively reduce the vibration of the floor panel 3 and improve the mode of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated.

[0053] In one embodiment, referring to Figure 1 and Figure 2 The floor assembly also includes a front floor beam 4 and a rear floor beam 5 ; the front floor beam 4 and the rear floor beam 5 are arranged on two sides of the floor panel 3 that are opposite to each other.

[0054] As an example, the floor assembly also includes a front floor beam 4 and a rear floor beam 5; the front floor beam 4 and the rear floor beam 5 are arranged on two sides of the floor panel 3 that are relatively arranged. Specifically, in the first direction, the front floor beam 4 is arranged on one side of the floor panel 3, and the rear floor beam 5 is arranged on the other side of the floor panel 3; the cross-sections of the front floor beam 4 and the rear floor beam 5 are closed cross-sections, and the sizes are determined according to the performance requirements of the entire vehicle. Force can be transmitted through the two beams, thereby improving the force transmission effect of the floor assembly.

[0055] In one embodiment, referring to Figure 1 and Figure 2 The front floor beam 4, the rear floor beam 5, the floor panel 3 and the sandwich structure are integrally extruded.

[0056] As an example, conventional automobile floor assemblies are mainly welded from beams and panels, which require a large number of molds, fixtures, and gauges. Stamping and welding require a large amount of equipment and personnel, and require a large amount of production sites; weld sealants need to be added to the weld edges, which increases costs and the risk of leakage; the weld edges need to overlap during welding, which increases the weight of the vehicle; the floor assembly is welded from multiple parts, with a long dimensional chain, large cumulative tolerances, complex processes, and difficult quality control; the stamping die structure is complex and the development cycle is long. In this example, the front floor beam 4, the rear floor beam 5, the floor panel 3, and the sandwich structure are extruded as a whole.

[0057] The one-piece extrusion molding method has a small number of parts and is light in weight, which can simplify the manufacturing of body parts. The number of parts is reduced from 3 to 6 to 1, which greatly shortens the dimension chain, reduces welding errors, improves the position accuracy of the installation point, and reduces the production cost. Compared with stamping dies, extrusion dies have low costs, simple structures, and short mold development cycles. The use of lightweight alloy materials can effectively reduce the weight of the body and achieve lightweight. The one-piece floor assembly does not require overlapping welding edges, which can effectively reduce the weight of the body and save coating weld sealant, thereby reducing weight and cost. The seal is reliable and there is no risk of leakage. The floor panel 3 is double-layered, and the sandwich structure is arranged in the middle of the two panels. The Y-direction penetration of the sandwich structure can effectively improve the Z-direction stiffness of the panel. The sandwich structure has a negative Poisson's ratio effect, which can effectively reduce panel vibration, improve panel mode, improve the NVH performance of the whole vehicle, and at the same time, the damping pad can be eliminated to reduce costs.

[0058] The one-piece extruded floor assembly in this embodiment is beneficial to the lightweight of the entire vehicle, improves the rigidity of the floor assembly, and improves the NVH performance; it can simplify the parts manufacturing process, improve the product qualification rate, and shorten the project development cycle.

[0059] The utility model embodiment provides a car, referring to Figure 1-5 , including floor assembly.

[0060] As an example, the floor assembly includes a sandwich structure and a floor panel 3; the floor panel 3 includes a housing space arranged along the second direction; the sandwich structure is arranged in the housing space, and is used to generate a negative Poisson's ratio effect when the floor panel 3 is subjected to an external force in the second direction. The sandwich structure specifically includes a cell structure 1 arranged along the first direction, that is, the cell structure 1 can be arranged along the X direction or along the Y direction; the cell structure 1 includes at least one cell matrix 2 arranged along the second direction, that is, at least one cell matrix 2 is arranged along the Z direction. Each cell matrix 2 includes a cell hole wall 21 and an energy absorption cavity 22 arranged in the cell hole wall 21. The cell hole walls 21 and the energy absorption cavity 22 of the multiple cell matrices 2 cooperate to effectively absorb the collision force received by the first workpiece and ensure the safety performance of the first workpiece; at the same time, the design of the energy absorption cavity 22 can reduce the cost of the sandwich structure, thereby achieving the goal of satisfying the safety performance of the workpiece without excessively increasing the weight cost. The concave structure with negative Poisson's ratio effect formed by the cell hole wall 21 concave in the first direction makes the sandwich structure have negative Poisson's ratio effect, which can effectively reduce the vibration of the workpiece and improve the workpiece mode. When the workpiece is subjected to the force in the second direction or vibrates in the second direction, the surrounding materials collapse inward, so that the local density of the workpiece increases, thereby more effectively resisting deformation and vibration. For example, the sandwich structure is arranged in the floor panel 3 of the floor assembly of the automobile. The sandwich structure has a negative Poisson's ratio effect. When the floor panel 3 vibrates in the Z direction, the surrounding materials collapse inward, so that the local density of the floor panel 3 increases, thereby more effectively resisting deformation and vibration, and can effectively reduce the vibration of the floor panel 3 and improve the mode of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated. The left and right sides of the floor assembly overlap with the longitudinal beam. When the vehicle is hit from the side, the force can be transmitted to the left and right through the front floor beam 4 and the rear floor beam 5.

[0061] The sandwich structure in this example has a negative Poisson's ratio effect, which can effectively reduce the vibration of the floor panel 3 and improve the modal of the floor panel 3, so that the damping pad on the floor panel 3 can be eliminated. The sandwich structure is suitable for floor assemblies, especially for models with high NVH performance requirements and lightweight requirements.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sandwich structure, characterized in that: A cell structure comprising a cell structure arranged along a first direction; The cell structure includes at least one cell matrix arranged along the second direction; Each of the cell substrates comprises a cell pore wall and an energy absorbing cavity arranged in the cell pore wall, and the cell pore wall is concave to form a concave structure with a negative Poisson's ratio effect.

2. The sandwich structure according to claim 1, characterized in that: The cell pore wall of each cell matrix comprises two first cell edges, two second cell edges and two third cell edges; The two first cell edges are arranged relatively parallel to each other; The two ends of each of the first cell sides are respectively connected to the first end of the second cell side and the first end of the third cell side, the angle between the first cell side and the second cell side is an acute angle, and the angle between the first cell side and the third cell side is an acute angle; The second ends of the two second cell edges are connected, and the angle between the two second cell edges is an obtuse angle; The second ends of the two third cell edges are connected, and the angle between the two third cell edges is an obtuse angle.

3. The sandwich structure according to claim 2, characterized in that: Each of the cell structures comprises at least two cell bases arranged along the second direction; Two adjacent cell bases share the first cell edge.

4. The sandwich structure according to claim 2, characterized in that: In two adjacent rows of the cell structures, two adjacent cell matrices are arranged along a first direction, and a second cell edge of one cell matrix and a third cell edge of another cell matrix are shared cell edges.

5. The sandwich structure according to claim 2, characterized in that: The thickness of the cell hole wall of each of the cell matrixes is 0.5-2.0 mm; the angle of each of the acute angles is 45-80°; and the cell length of the cell matrix is ​​not less than 5 mm.

6. A floor assembly, characterized in that: A sandwich structure and a floor panel comprising any one of claims 1 to 5; The floor panel includes an accommodation space arranged along a second direction; The sandwich structure is arranged in the accommodating space, and is used to generate a negative Poisson's ratio effect when the floor panel is subjected to an external force.

7. The floor assembly according to claim 6, characterized in that: The floor panel comprises an upper panel and a lower panel; The upper panel and the lower panel cooperate to form an accommodating space arranged along the second direction.

8. The floor assembly according to claim 6, characterized in that: The floor assembly also includes a front floor beam and a rear floor beam; The front floor cross beam and the rear floor cross beam are disposed on opposite sides of the floor panel.

9. The floor assembly according to claim 8, characterized in that: The front floor beam, the rear floor beam, the floor panel and the sandwich structure are integrally extruded.

10. An automobile, characterized in that: The invention comprises the floor assembly as claimed in any one of claims 6 to 9.

Images