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CN-122014779-A - Multidirectional impact-resistant paper-cut-folded-paper synergistic metamaterial

CN122014779ACN 122014779 ACN122014779 ACN 122014779ACN-122014779-A

Abstract

The invention discloses a paper-cut-paper-break synergistic metamaterial capable of resisting impact in multiple directions, which is formed by combining a regular octahedron paper-cut structure and a Kresling paper-break structure. In the compression process, the edge constraint of the octahedral paper-cut structure is utilized to promote the buckling of the paper folding panel, so that the energy absorption efficiency is improved. Compared with the traditional reverse chirality Kresling paper folding metamaterial, the structure has higher specific energy absorption characteristic. In addition, the structural geometric structure has rotation periodicity, and shows good multi-directional mechanical property consistency and rigidity adjustability under quasi-static compression load. The invention can solve the problem that the existing metamaterial is difficult to realize stable and controllable mechanical properties in a plurality of main bearing directions, and remarkably improves the energy absorption efficiency of the structure under the condition of large deformation.

Inventors

  • YUAN XINGFEI
  • WANG XIN

Assignees

  • 浙江大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The multi-directional impact-resistant paper-cut-folded synergistic metamaterial is characterized by comprising a regular-octahedral paper-cut structure and at least one Kresling paper-folded unit structure, wherein the regular-octahedral paper-cut structure and the Kresling paper-folded unit structure are mutually embedded to form a combined structure, the regular-octahedral paper-cut structure comprises at least one unfolding state, and the geometric dimension of a Kresling paper-folded sheet is set according to the unfolding state of the regular-octahedral paper-cut.
  2. 2. The multi-directional impact-resistant paper-cut-folded synergistic metamaterial according to claim 1, wherein the number of the regular octahedral paper-cut structures is 1, and the number of the Kresling paper-folded unit structures is 6.
  3. 3. The multi-directional impact resistant paper cut-folded collaborative metamaterial according to claim 1, wherein the metamaterial structure has 8 loading planes and 4 loading axes, wherein geometric compositions in 4 loading directions are arranged clockwise, and the rest 4 are arranged anticlockwise.
  4. 4. The multi-directional impact resistant paper-cut-fold synergistic metamaterial according to claim 1, wherein the regular octahedral paper-cut structure is unfolded with a gap length of Kresling fold length of folded paper is Both satisfy 。
  5. 5. The multi-directional impact-resistant paper-cut-folded cooperative metamaterial according to claim 1, wherein the unit cell structures can be arranged in a staggered manner or in a mirror image manner.
  6. 6. The multi-directional impact-resistant paper-cut-folded synergistic metamaterial according to claim 1, wherein the regular-octahedral paper-cut structure is a paper-cut structure formed by expanding octahedrons in a manner of slotting along each side of the octahedrons, adjacent planes are connected only through vertexes, a single vertex is connected only with two planes, the total number of the vertexes is increased from 6 before expansion to 12, and expansion of the structure is realized through a mode of offsetting and rotating each plane to ensure the connection relationship of the vertexes.
  7. 7. The multi-directional impact resistant paper-cut-folded collaborative metamaterial according to claim 1 or 6, wherein geometric elements of the metamaterial satisfy the following conditions in the unfolding process of the regular octahedron paper-cut structure: ; Wherein, the Is the side length of a regular octahedron, Is the radius of the circumscribing circle of the bottom surface and the top surface of the cell structure, and the radius of the circumscribing cylinder of the whole structure , For the distance of the top and bottom surfaces to the adjacent intermediate node, For the pitch of the intermediate nodes, the overall height of the structure , Is the corner of the middle node polygon relative to the bottom surface, Is the corner of the top surface relative to the bottom surface.
  8. 8. The multi-directional impact-resistant paper-cut-folded synergistic metamaterial according to claim 1, wherein the multi-directional impact-resistant structure can show similar mechanical properties in 8 different loading directions.
  9. 9. The multi-directional impact-resistant paper cut-folded synergistic metamaterial according to claim 1, wherein the metamaterial shows two-stage rigidity in the structural deformation process and is accompanied by the phenomenon of rigidity step.
  10. 10. The multi-directional impact-resistant paper-cut-folded synergistic metamaterial according to claim 1, wherein the matrix material of the metamaterial is at least one selected from a metal material, a composite material or a shape memory alloy, wherein the metal material is at least one selected from an aluminum alloy and stainless steel 316L, and the composite material is at least one selected from a relatively tough composite material such as nylon and high-elastic recoverable rubber.

Description

Multidirectional impact-resistant paper-cut-folded-paper synergistic metamaterial Technical Field The invention belongs to the field of mechanical metamaterials, and particularly relates to a paper-cut-paper-folding synergistic metamaterials capable of resisting impact in multiple directions. Background Conventional energy absorbing structures, such as foam materials, honeycomb structures, bellows, or the like, dissipate energy primarily through plastic deformation of the material or buckling of the structure when subjected to impact loads. Such structures tend to have significant anisotropy, i.e., significant differences in mechanical properties (e.g., energy absorbing capacity, load carrying efficiency, deformation modes, etc.) in different directions, resulting in unstable behavior in complex and variable impact environments (e.g., collisions, blast shock waves, etc. from different directions), and difficulty in achieving predictable and balanced energy absorbing effects. In addition, the deformation behavior of conventional structures is often uncontrollable, often resulting in random, localized failure, limiting their energy absorption efficiency. In recent years, paper folding structures and paper cutting structures have been introduced into the field of energy absorption due to their abundant geometric designability and unique deformation mechanisms. The paper folding structure can guide the whole to deform orderly through a preset folding mode to realize higher energy absorption efficiency, and the paper cutting structure introduces controllable hinges or flexible units into the two-dimensional plate through cutting patterns to endow out-of-plane deformability. However, the single paper folding structure tends to have a relatively fixed deformation mode, is sensitive to the loading direction, and still has outstanding performance anisotropy problems, while the single paper cutting structure may have defects in-plane bearing and energy absorption density. In the prior art, although some design attempts combining paper folding and paper cutting concepts are made, optimization of a specific deformation shape or a certain single performance is focused on, and the problems that mechanical properties (such as initial peak force, platform stress, energy absorption and the like) are similar and adjustable in a plurality of main bearing directions cannot be systematically solved. The structure still has difficulty in ensuring stable, reliable and efficient performance when the existing structure is used for coping with multidirectional impact, and the wide application of the structure in the fields of aerospace, vehicle protection, precise equipment packaging and the like with strict requirements on multidirectional impact protection is limited. Disclosure of Invention In view of the above problems, the present invention aims to provide a paper-cut-paper-folding synergistic metamaterial with multi-directional impact resistance, so as to solve the problems that the existing structure cannot cope with multi-directional impact and has no adjustability of mechanical properties. For this purpose, the invention adopts the following technical scheme: The multi-directional impact-resistant paper-cut-folded synergistic metamaterial comprises a regular-octahedral paper-cut structure and at least one Kresling paper-folded unit structure, wherein the regular-octahedral paper-cut structure and the Kresling paper-folded unit structure are mutually embedded to form a combined structure, the regular-octahedral paper-cut structure comprises at least one unfolding state, and the geometric dimension of a Kresling paper-folded sheet is set according to the unfolding state of the regular-octahedral paper-cut. Further, the number of the regular octahedral paper-cut structures is 1, the number of the Kresling paper-folding unit structures is 6, and the 1 regular octahedral paper-cut structures and the 6 Kresling paper-folding units form a metamaterial unit cell structure. Further, the metamaterial structure has 8 loading planes and 4 loading axes, wherein the geometric compositions in 4 loading directions are arranged clockwise, and the other 4 loading directions are arranged anticlockwise, so that the geometric compositions of the structure have rotation periodicity and overall show anti-chiral characteristics. Further, the length of the slit unfolded by the regular octahedron paper-cut structure isKresling fold length of folded paper isBoth satisfy。 Further, the arrangement mode of the unit cell structures can adopt cross staggered arrangement or mirror image arrangement. Further, the regular octahedron paper-cut structure is a paper-cut structure formed by expanding an octahedron in a slotting mode along each side of the octahedron, adjacent planes of the regular octahedron are connected through vertexes only, a single vertex is connected with two planes only, the total number of the vertexes is increased from 6 before expansio