Negative stiffness superstructure forming die

Abstract

The invention relates to the technical field of negative stiffness superstructure forming, and discloses a negative stiffness superstructure forming die which comprises first cell strip assemblies, second cell strip assemblies and a fixing assembly, and each first cell strip assembly comprises a first cell strip; the at least one second cell strip assembly is arranged between every two adjacent first cell strip assemblies, each second cell strip assembly comprises a plurality of second cell strips which are arranged in parallel at intervals, and the second cell strips and the first cell strips in the first cell strip assemblies are arranged at intervals; the gap between the adjacent second cell strips and the gap between the adjacent first cell strips in the first cell strip assembly are staggered; the fixing assembly is detachably connected with at least part of the first cell strips and the second cell strips and used for fixing the multiple first cell strips and the multiple second cell strips. When the negative stiffness superstructure is extruded, the cell walls formed between the adjacent second cell strips are embedded into the cavities where the first cell strips are located, the stiffness of the negative stiffness superstructure is changed from positive to negative, and in the process, the structure has the stable energy absorption characteristic and has the good anti-impact capacity.

Description

Technical Field

[0001] This invention relates to the field of negative stiffness superstructure forming technology, specifically to a negative stiffness superstructure forming mold. Background Technology

[0002] Negative stiffness superstructures, due to their unique geometry and arrangement, exhibit negative stiffness under compressive loads, giving them excellent energy absorption characteristics. The formed structure can switch between multiple stable states, dissipating energy through local collapse or phase transition, making it suitable for impact-resistant or vibration-damping applications.

[0003] However, existing composite material molding methods lack molding dies for negative stiffness superstructures, thus limiting the research and application of fiber composite negative stiffness superstructures in various fields. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a negative stiffness superstructure forming mold to solve the technical problem of the lack of forming molds for negative stiffness superstructures in the prior art.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a negative stiffness superstructure forming mold, comprising: At least two spaced-apart first cell strip components, each first cell strip component comprising a plurality of parallel and spaced-apart first cell strips; At least one second cell strip assembly is disposed between two adjacent first cell strip assemblies. The second cell strip assembly includes a plurality of parallel and spaced-apart second cell strips, which are spaced apart from the first cell strips in the first cell strip assembly. The gaps between adjacent second cell strips are misaligned with the gaps between adjacent first cell strips in the first cell strip assembly. A fixing component, detachably connected to at least a portion of the first cell strip and the second cell strip, for fixing a plurality of the first cell strips and a plurality of the second cell strips.

[0006] In one embodiment, in the first cell strip assembly, a first gap is formed between adjacent first cell strips, and the spacing of the first gap is L1; In the second cell strip assembly, a second gap is formed between adjacent second cell strips, and the spacing of the second gap is L2. A third gap is formed between the second cell strip and the first cell strip, and the spacing of the third gap is L3; Among them, L1 is greater than L2 and L3.

[0007] In one embodiment, L1 is equal to twice the amount of L2 and twice the amount of L3; The number of the second gap is twice the number of the first gap.

[0008] In one embodiment, the side of the first cell strip facing the second cell strip is a first arc surface that convexes outward or is concave inward; Multiple second cell strips form multiple second arc surfaces relative to multiple first arc surfaces, and the shape of the second arc surface matches the shape of the first arc surface.

[0009] In one embodiment, the plurality of second cell strips are respectively a plurality of third cell strips and a plurality of fourth cell strips, and the plurality of third cell strips and the plurality of fourth cell strips are alternately distributed along the arrangement direction of the first cell strips. The third cell strips are disposed between two directly opposite first cell strips in two adjacent first cell strip assemblies, and the fourth cell strips are disposed at the first gap in two adjacent first cell strip assemblies.

[0010] In one embodiment, the peripheral wall of the first cell strip has a plane, a first arc surface and two first vertical surfaces. The first arc surface is disposed opposite to the plane, and the two first vertical surfaces are parallel to each other and disposed on both sides of the first arc surface. The two sides of the first vertical surfaces are respectively connected to the plane and the first arc surface.

[0011] In one embodiment, the peripheral wall of the third cell strip has two opposing third arc surfaces and two second vertical surfaces. The two third arc surfaces are respectively disposed opposite to the first arc surfaces of the two first cell strips. The two second vertical surfaces are parallel to each other and disposed on both sides of the first arc surface. The two sides of the second vertical surfaces are respectively connected to the two third arc surfaces.

[0012] In one embodiment, the peripheral wall of the fourth cell strip has two fourth arc surfaces, two fifth arc surfaces, and two third vertical surfaces arranged back to back. The fourth arc surfaces and the fifth arc surfaces are arranged on both sides of the first gap, and the fourth arc surfaces, the fifth arc surfaces, and the third vertical surfaces are alternately distributed along the circumference of the fourth cell strip. The third arc surface and the fourth and fifth arc surfaces on both sides of the third arc surface combine to form the second arc surface.

[0013] In one embodiment, the fixing component includes: Two first clamping parts are respectively disposed at both ends of the arrangement direction of the plurality of first cell strips; The first connecting part connects two first clamping parts and is used to fix multiple first cell strips and multiple second cell strips along the arrangement direction of multiple first cell strips; Two second clamping portions are respectively disposed on opposite sides of the two first cell strip assemblies; and The second connecting part connects two second clamping parts and is used to fix multiple first cell strips and multiple second cell strips along the arrangement direction perpendicular to the multiple first cell strips.

[0014] In one embodiment, protrusions are formed on opposite sides of the two first clamping portions, which are embedded between two adjacent first cell strip assemblies, and the protrusions are spaced apart from the second cell strip.

[0015] Compared with the prior art, the negative stiffness superstructure molding die provided by the present invention individually wraps the surface of each first cell and second cell with carbon fiber prepreg, and then arranges the first cell and second cell with carbon fiber prepreg laid on them in the above layout. Then, the positions of the first cell and second cell are fixed by fixing components. After the carbon fiber prepreg is cured and formed in the gap, a negative stiffness superstructure is formed. The first cell and second cell are separated from the negative stiffness superstructure, and the part of the negative stiffness superstructure that is separated from the first cell and second cell forms a cavity.

[0016] The arrangement direction of multiple first and second cells is the first direction, and the direction perpendicular to the first direction is the second direction. Through the staggered arrangement of the first and second cells, when the negative stiffness superstructure is compressed by the second direction, the cell wall formed between adjacent second cells is embedded in the cavity where the first cell is located, and its stiffness changes from positive to negative. In this process, the structure has stable energy absorption characteristics and good impact resistance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first clamping part and the protrusion in a negative stiffness superstructure forming mold according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first cell strip in a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the third cell strip in a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the fourth cell strip in a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of two second clamping parts in a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the first connecting part in a negative stiffness superstructure forming mold provided in an embodiment of the present invention; Figure 8This is a schematic diagram of a negative stiffness superstructure formed by a negative stiffness superstructure mold according to an embodiment of the present invention; Figure 9 This is a schematic diagram of a negative stiffness superstructure formed by a negative stiffness superstructure mold according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a negative stiffness superstructure before impact resistance, formed by a negative stiffness superstructure mold according to an embodiment of the present invention. Figure 11 This is a schematic diagram of the impact-resistant structure of a negative stiffness superstructure formed by a negative stiffness superstructure mold according to an embodiment of the present invention. Figure 12 This is a stress-strain diagram of a negative stiffness superstructure formed by a negative stiffness superstructure mold according to an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: First cell assembly 1; First cell 11; First arc surface 11a; Plane 11b; First vertical surface 11c; Second cell assembly 2; second arc surface 2a; third cell 21; third arc surface 21a; second vertical surface 21b; fourth cell 22; fourth arc surface 22a; fifth arc surface 22b; third vertical surface 22c; Fixing component 3; first clamping part 31; first connecting part 32; second clamping part 33; protrusion 34. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] To address the technical problem of the lack of molding dies for negative stiffness superstructures, this invention provides a molding die for negative stiffness superstructures, which can be used to form negative stiffness superstructures from fiber composite materials.

[0021] Please see Figure 1 , Figure 1This is a schematic diagram of a negative stiffness superstructure forming mold according to an embodiment of the present invention. The negative stiffness superstructure forming mold includes at least two spaced first cell assemblies 1, at least one second cell assembly 2, and a fixing assembly 3. Each first cell assembly 1 includes a plurality of parallel and spaced first cells 11. At least one second cell assembly 2 is disposed between two adjacent first cell assemblies 11. The second cell assembly 2 includes a plurality of parallel and spaced second cells. The second cells are spaced apart from the first cells 11 in the first cell assembly 11, and the gap between adjacent second cells is misaligned with the gap between adjacent first cells 11 in the first cell assembly 11. The fixing assembly 3 is detachably connected to at least part of the first cells 11 and the second cells, and is used to fix the plurality of first cells 11 and the plurality of second cells.

[0022] Specifically, carbon fiber prepreg is individually wrapped around the surface of each first cell 11 and second cell. Then, the first cell 11 and second cell with carbon fiber prepreg are arranged in the above layout. The positions of the first cell 11 and second cell are fixed by the fixing component 3. After the carbon fiber prepreg is cured and formed in the gap, a negative stiffness superstructure is formed. The first cell 11 and second cell are separated from the negative stiffness superstructure. The part of the negative stiffness superstructure that is separated from the first cell 11 and second cell forms a cavity.

[0023] The arrangement direction of the multiple first cells 11 and second cells is the first direction, and the direction perpendicular to the first direction is the second direction. Through the staggered arrangement of the first cells 11 and the second cells, when the negative stiffness superstructure is compressed by the second direction, the cell wall formed between the adjacent second cells is embedded in the cavity where the first cell 11 is located, and its stiffness changes from positive to negative. In this process, the structure has stable energy absorption characteristics and good impact resistance.

[0024] It should be understood that the thickness of each cell wall in the resulting negative stiffness superstructure can be the same or different. Specifically, for example... Figure 1 , Figure 8 and Figure 9 As shown, in one embodiment, in the first cell strip 11 assembly 1, a first gap is formed between adjacent first cell strips 11, and the spacing of the first gap is L1; in the second cell strip assembly 2, a second gap is formed between adjacent second cell strips, and the spacing of the second gap is L2; ​​a third gap is formed between the second cell strip and the first cell strip 11, and the spacing of the third gap is L3; wherein, L1 is greater than L2 and L3.

[0025] The cell walls formed in the gaps between the first cell strips 11 play a role in bearing and supporting the negative stiffness superstructure. They are designed to be short and thick. The cell walls formed in the gaps between the second cell strips play a role in deformation coordination. They can guide the deformation direction of the negative stiffness superstructure, so that the local parts of the negative stiffness superstructure collapse according to the set plan, thereby improving the overall stability of the negative stiffness superstructure.

[0026] In order to ensure that the carbon fiber prepreg fills the first gap, the carbon fiber prepreg can be filled into the first gap, or more carbon fiber prepreg can be wrapped around the vertical sides of the first cell 11 when the carbon fiber prepreg is wrapped around the outside of the first cell 11.

[0027] It should be understood that in a negative stiffness superstructure, the number of first gaps can be equal to the number of second gaps. Specifically, for example... Figure 1 , Figure 8 and Figure 9 As shown, in one embodiment, L1 is equal to twice L2 and twice L3; the number of second gaps is twice the number of first gaps.

[0028] In this embodiment, the cell walls formed in the gaps between the first cell strips 11 are made into short and thick cell walls, while the cell walls between the second cell strips and between the second cell strip and the first cell strip 11 are thin cell walls. Thin cell walls are more easily deformed under pressure, causing the negative stiffness superstructure to contract under pressure in a set direction, and the cell wall structure changes from positive stiffness to negative stiffness. At the same time, the number of second gaps is set to twice the number of first gaps, so that in the formed structure, the number of cell walls in the second gaps is twice that in the first gaps. This can guide the cell walls in the second gaps to squeeze the cell walls between the second cell strip and the first cell strip 11, causing the cell wall structure to change from positive stiffness to negative stiffness. The transformation process can play a role in buffering and vibration reduction. When pressure is continued, the second cell strip enters a stable bearing stage, in which the bearing strength and stiffness will be greatly improved.

[0029] When clamping is performed along the arrangement direction of the first cell strips 11, because the gap between the first cell strips 11 is larger than the gap between the second cell strips, after multiple second cell strips are clamped, the gap between the first cell strips 11 is large and not restricted, resulting in the first cell strips 11 still being able to move after the second cell strips are clamped. Therefore, the first cell strips 11 are not effectively clamped and positioned along the first direction. For this reason, Figure 1 and Figure 3 As shown, in one embodiment, the side of the first cell strip 11 facing the second cell strip is a first arc surface 11a that protrudes outward or is recessed inward; a plurality of second cell strips are formed with a plurality of second arc surfaces 2a relative to a plurality of first arc surfaces 11a, and the shape of the second arc surface 2a matches the shape of the first arc surface 11a.

[0030] In this embodiment, when clamping and fixing the first cell strip 11 and the second cell strip using the fixing component 3, clamping is first performed along the first direction until multiple second cell strips are clamped, eliminating gaps between adjacent second cell strips. At this time, multiple second arc surfaces 2a are formed between the multiple second cell strips. The first arc surface 11a of the first cell strip 11 is fitted into the second arc surface 2a, and the first cell strip 11 is positioned by the fit between the first arc surface 11a and the second arc surface 2a. Then, the multiple first cell strips 11 and the second cell strips are clamped along the second direction. After clamping, both the first cell strip 11 and the second cell strip are positioned and clamped according to a preset method. At the same time, the first arc surface 11a and the second arc surface 2a are set, such as... Figure 10 , Figure 11 and Figure 12 As shown, when the negative stiffness superstructure is compressed, it can push the first arc surface 11a to be concave inward. At this time, the stiffness of the negative stiffness superstructure changes from positive to negative. The transformation process can play a role in buffering and vibration reduction. Moreover, the arc surface structure has better guiding and resetting effects than the planar structure.

[0031] In order to form the second arc surface 2a while ensuring that the number of second gaps formed between the second cells is twice the number of first gaps, for this purpose, as follows: Figure 1 , Figure 8 and Figure 9 As shown, in one embodiment, the multiple second cells are multiple third cells 21 and multiple fourth cells 22. The multiple third cells 21 and multiple fourth cells 22 are alternately distributed along the arrangement direction of the first cells 11. The third cells 21 are disposed between two directly opposite first cells 11 in two adjacent first cell 11 components 1, and the fourth cells 22 are disposed at the first gap in two adjacent first cell 11 components 1.

[0032] In this embodiment, by setting the second cell strip as multiple third cell strips 21 and multiple fourth cell strips 22, with the third cell strips 21 positioned between two adjacent first cell strips 11 and the fourth cell strips 22 positioned at the gaps in the horizontally positioned first cell strip 11 support, the number of gaps formed between the third cell strips 21 and the fourth cell strips 22 is twice the number of gaps formed between adjacent first cell strips 11.

[0033] It should be understood that the cross-section of the first cell 11 can be square, trapezoidal, etc., specifically, such as Figure 3 As shown, in one embodiment, the peripheral wall of the first cell strip 11 has a plane 11b, a first arc surface 11a and two first vertical surfaces 11c. The first arc surface 11a is arranged back to back with the plane 11b, and the two first vertical surfaces 11c are parallel to each other and arranged on both sides of the first arc surface 11a. The two sides of the first vertical surface 11c are respectively connected to the plane 11b and the first arc surface 11a.

[0034] In this embodiment, the first arc surface 11a of the first cell strip 11 and the second arc surface 2a of the second cell strip cooperate to position the first cell strip 11. By setting the side of the first cell strip 11 away from the first arc surface 11a as a plane 11b, when the fixing component 3 clamps the first cell strip 11 along the second direction, the fixing component 3 gradually fits into the plane 11b of the first cell strip 11. During the fitting process, the circumferential positioning of the first cell strip 11 can be achieved. Combining the first arc surface 11a and the second arc surface 2a, the first cell strip 11 can be positioned along the first direction. The position is positioned and clamped, eliminating the need for additional positioning structures for each first cell 11, thus reducing the difficulty of assembling the first cell 11; adjacent first cell 11s have mutually parallel first vertical surfaces 11c, and vertical cell walls are formed between the first vertical surfaces 11c of adjacent first cell 11s; moreover, when the fixing component 3 clamps the plane 11b, it enables the carbon fiber prepreg wrapped around the plane 11b to form a complete plane 11b on the opposite side of the two first cell 11 components 1, where a complete pressure-resistant and sealing plane is formed.

[0035] It should be understood that the cross-section of the third cell 21 can be square or other shapes, specifically, such as Figure 4 As shown, in one embodiment, the peripheral wall of the third cell strip 21 has two opposing third arc surfaces 21a and two second vertical surfaces 21b. The two third arc surfaces 21a are respectively disposed opposite to the first arc surfaces 11a of the two first cell strips 11. The two second vertical surfaces 21b are parallel to each other and disposed on both sides of the first arc surfaces 11a. The two sides of the second vertical surfaces 21b are respectively connected to the two third arc surfaces 21a.

[0036] In this embodiment, the third arc surface 21a can cooperate with the first arc surface 11a. The second vertical surface 21b located on both sides of the two third arc surfaces 21a has a second gap between the second vertical surface 21b and the fourth cell strip 22 to form a vertical cell wall. The two second vertical surfaces 21b of the third cell strip 21 can form two second gaps for cell wall forming by cooperating with the fourth cell strip 22. The two formed cell walls are located between two adjacent first cell strips 11 and between two adjacent first arc surfaces 11a, and can form two short cell walls that support the first arc surface 11a. The ends of the two short cell walls are connected to the arc-shaped cell wall formed at the first arc surface 11a, which can guide the deformation of the arc-shaped cell wall and reduce the deformation of the short cell wall, so that the stiffness of the negative stiffness superstructure changes from positive to negative.

[0037] It should be understood that the cross-section of the fourth cell 22 can be prismatic, elliptical, or spherical, etc. Specifically, such as Figure 5As shown, in one embodiment, the peripheral wall of the fourth cell strip 22 has two fourth arc surfaces 22a, two fifth arc surfaces 22b, and two third vertical surfaces 22c arranged back to back. The fourth arc surfaces 22a and the fifth arc surfaces 22b are disposed on both sides of the first gap, and the fourth arc surfaces 22a, the fifth arc surfaces 22b, and the third vertical surfaces 22c are alternately distributed along the circumference of the fourth cell strip 22. The fourth arc surfaces 22a and the fifth arc surfaces 22b on both sides of the third arc surface 21a combine to form the second arc surface 2a.

[0038] In this embodiment, the second arc surface 2a is formed by combining the third arc surface 21a and the fourth arc surface 22a and the fifth arc surface 22b on both sides of the third arc surface 21a. The relatively small third cell strips 21 and fourth cell strips 22 are spliced ​​together to form the second arc surface 2a corresponding to the size of the first arc surface 11a, which can position the first cell strip 11. At the same time, the fourth arc surface 22a and the fifth arc surface 22b are symmetrically arranged on both sides of the first gap, so that the cell walls formed between adjacent first cell strips 11 are shortened. Figure 10 , Figure 11 and Figure 12 As shown, Figure 10 The middle arrow indicates the direction of the compressive force applied to the negative stiffness superstructure. When the negative stiffness superstructure is compressed, the hexagonal structure formed by the two fourth arc surfaces 22a, the two fifth arc surfaces 22b, and the two third vertical surfaces 22c can adapt to deformation, avoiding interference with the inward and outward deformation of the cell wall at the first arc surface 11a, and can guide the cell wall deformation formed at the first cell strip 11.

[0039] It should be understood that the fixing component 3 can be an elastic rope, a clamping plate, a clamping block, etc., specifically, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, in one embodiment, the fixing component 3 includes two first clamping parts 31, a first connecting part 32, two second clamping parts 33, and a second connecting part (not shown in the figure). The two first clamping parts 31 are respectively disposed at both ends of the arrangement direction of the plurality of first cell strips 11; the first connecting part 32 connects the two first clamping parts 31 and is used to fix the plurality of first cell strips 11 and the plurality of second cell strips along the arrangement direction of the plurality of first cell strips 11; the two second clamping parts 33 are respectively disposed on the two opposite sides of the two first cell strip 11 components 1; the second connecting part connects the two second clamping parts 33 and is used to fix the plurality of first cell strips 11 and the plurality of second cell strips along the direction perpendicular to the arrangement direction of the plurality of first cell strips 11.

[0040] In this embodiment, when it is necessary to clamp the first cell 11, the third cell 21, and the fourth cell 22, two first clamping parts 31 are disposed on both sides of the first cell 11 along the first direction. Then, the first connecting part connects the two first clamping parts 31 and clamps them. During the clamping process, multiple third cells 21 and fourth cells 22 are clamped and positioned along the first direction. Then, along the second direction, two second clamping parts 33 are disposed on the opposite sides of the two first cell 11 assemblies 1 and connected by the second connecting part. This causes the two second clamping parts to clamp the first cell 11, the second cell 21, and the fourth cell 22 along the second direction, so that the carbon fiber prepreg between the third cell 21 and the fourth cell 22 is formed into a set shape.

[0041] It should be understood that the first clamping part 31 can be a clamping plate, a clamping block, or a clamping strip, etc.; the first connecting part 32 can be a screw and nut structure, a stud nut structure, an elastic ring, etc.; the second clamping part 33 can be a clamping plate, a clamping piece, or a clamping strip, etc.; and the second connecting structure can be a screw and nut structure or a stud nut structure, etc.

[0042] Specifically, such as Figure 7 As shown, in one embodiment, the first connecting part 32 is a bolt and nut structure, with the threaded end of the bolt passing through two first clamping parts 31 and the nut connecting the threaded end of the bolt; the second connecting part is a bolt and nut structure, with the threaded end of the bolt passing through two second clamping parts 33 and the nut connecting the threaded end of the bolt.

[0043] It should be understood that the first connecting part 32 and the second connecting part are located outside the molding areas of the first cell 11, the third cell 21 and the fourth cell 22, so as to avoid the first connecting part 32 and the second connecting part interfering with the molding of the carbon fiber prepreg.

[0044] Because the dimensions of the third cell 21 and the fourth cell 22 are different from the cross-sectional dimensions of the first cell 11, after the first cell 11, the third cell 21, and the fourth cell 22 are assembled, there is a gap between two adjacent first cell 11 and third cell 21 at the first clamping part 31. This gap prevents the carbon fiber prepreg at that location from being properly positioned, affecting the molding accuracy and consequently preventing the formation of the intended negative stiffness superstructure. Therefore, as... Figure 1 and Figure 2 As shown, in one embodiment, the two first clamping portions 31 have protrusions 34 formed on opposite sides of each other, which are embedded between the two adjacent first cell strip 11 components 1, and the protrusions 34 are spaced apart from the second cell strip.

[0045] In this embodiment, by forming a protrusion 34 on the side of the first clamping part 31 facing the third cell strip 21, the protrusion 34 is embedded between two adjacent first cell strips 11. The protrusion 34 cooperates with the outer wall of the first cell strip 11 and the third cell strip 21 on the side of the first cell strip 11 and the third cell strip 21, which can fill the gap between the two adjacent first cell strips 11 and the third cell strip 21, so that the carbon fiber prepreg at that location can be formed into a set shape.

[0046] It should be understood that the number of first cell strip 11 components 1 can be two, four, or six, etc., and the number of second cell strip components 2 can be one, two, or three, etc. Specifically, in one embodiment, each pair of first cell strip 11 components 1, one second cell strip component 2, two first clamping parts, and several first connecting parts form a cell strip unit. Multiple cell strip units can be stacked in the vertical direction. When stacking, adjacent cell strip units are vertically distributed, and then multiple cell strip units are clamped by two second clamping parts and second connecting parts.

[0047] By stacking them vertically, negative stiffness superstructures of different sizes can be formed. Secondly, by vertically distributing adjacent cell strips, negative stiffness effects are generated in both the lateral and vertical directions, achieving three-dimensional energy absorption. Multi-directional collapse under impact load improves energy absorption efficiency compared to single-layer structures.

[0048] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A negative stiffness superstructure forming mold, characterized in that, include: At least two spaced-apart first cell strip components, each first cell strip component comprising a plurality of parallel and spaced-apart first cell strips; At least one second cell strip assembly is disposed between two adjacent first cell strip assemblies. The second cell strip assembly includes a plurality of parallel and spaced-apart second cell strips, which are spaced apart from the first cell strips in the first cell strip assembly. The gaps between adjacent second cell strips are misaligned with the gaps between adjacent first cell strips in the first cell strip assembly. A fixing component, detachably connected to at least a portion of the first cell strip and the second cell strip, for fixing a plurality of the first cell strips and a plurality of the second cell strips.

2. The negative stiffness superstructure forming mold according to claim 1, characterized in that, In the first cell strip assembly, a first gap is formed between adjacent first cell strips, and the spacing of the first gap is L1; In the second cell strip assembly, a second gap is formed between adjacent second cell strips, and the spacing of the second gap is L2. A third gap is formed between the second cell strip and the first cell strip, and the spacing of the third gap is L3; Among them, L1 is greater than L2 and L3.

3. The negative stiffness superstructure forming mold according to claim 2, characterized in that, The L1 is equal to twice the L2 and twice the L3; The number of the second gap is twice the number of the first gap.

4. The negative stiffness superstructure forming mold according to claim 2, characterized in that, The side of the first cell strip facing the second cell strip is a first arc surface that bulges outward or is concave inward; Multiple second cell strips form multiple second arc surfaces relative to multiple first arc surfaces, and the shape of the second arc surface matches the shape of the first arc surface.

5. The negative stiffness superstructure forming mold according to claim 4, characterized in that, The plurality of second cell strips are respectively a plurality of third cell strips and a plurality of fourth cell strips. The plurality of third cell strips and the plurality of fourth cell strips are alternately distributed along the arrangement direction of the first cell strips. The third cell strips are disposed between two directly opposite first cell strips in two adjacent first cell strip assemblies, and the fourth cell strips are disposed at the first gap in two adjacent first cell strip assemblies.

6. The negative stiffness superstructure forming mold according to claim 5, characterized in that, The peripheral wall of the first cell strip has a plane, a first arc surface and two first vertical surfaces. The first arc surface is arranged opposite to the plane, and the two first vertical surfaces are parallel to each other and arranged on both sides of the first arc surface. The two sides of the first vertical surface are respectively connected to the plane and the first arc surface.

7. The negative stiffness superstructure forming mold according to claim 6, characterized in that, The peripheral wall of the third cell strip has two opposing third arc surfaces and two second vertical surfaces. The two third arc surfaces are respectively arranged opposite to the first arc surfaces of the two first cell strips. The two second vertical surfaces are parallel to each other and are arranged on both sides of the first arc surface. The two sides of the second vertical surfaces are respectively connected to the two third arc surfaces.

8. The negative stiffness superstructure forming mold according to claim 7, characterized in that, The peripheral wall of the fourth cell strip has two fourth arc surfaces, two fifth arc surfaces, and two third vertical surfaces arranged back to back. The fourth arc surfaces and the fifth arc surfaces are arranged on both sides of the first gap. The fourth arc surfaces, the fifth arc surfaces, and the third vertical surfaces are alternately distributed along the circumference of the fourth cell strip. The third arc surface and the fourth and fifth arc surfaces on both sides of the third arc surface combine to form the second arc surface.

9. The negative stiffness superstructure forming mold according to claim 1, characterized in that, The fixing component includes: Two first clamping parts are respectively disposed at both ends of the arrangement direction of the plurality of first cell strips; The first connecting part connects two first clamping parts and is used to fix multiple first cell strips and multiple second cell strips along the arrangement direction of multiple first cell strips; Two second clamping portions are respectively disposed on opposite sides of the two first cell strip assemblies; and The second connecting part connects two second clamping parts and is used to fix multiple first cell strips and multiple second cell strips along the arrangement direction perpendicular to the multiple first cell strips.

10. The negative stiffness superstructure forming mold according to claim 9, characterized in that, On opposite sides of the two first clamping portions, protrusions are formed that are embedded between two adjacent first cell strip assemblies, and the protrusions are spaced apart from the second cell strip.

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