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Novel three-dimensional cellular metamaterial with local tension-torsion coupling effect

A technology of coupling effects and metamaterials, applied in the direction of layered products, etc., can solve problems such as structural instability and damage

Inactive Publication Date: 2019-05-31
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Experiments have found that this hollow cylindrical structure will cause structural instability and failure due to local buckling when it is loaded

Method used

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  • Novel three-dimensional cellular metamaterial with local tension-torsion coupling effect
  • Novel three-dimensional cellular metamaterial with local tension-torsion coupling effect
  • Novel three-dimensional cellular metamaterial with local tension-torsion coupling effect

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Embodiment 1

[0026] Such as figure 1 A new type of three-dimensional multicellular metamaterial with local tension-torsion coupling effect is shown, which is obtained from the three-dimensional structure of the unit cell through a spatial array. The straight bars that increase the slope between the rings are realized, and the three-dimensional structure of the unit cell (such as figure 2 ), two adjacent layers of identical four-ligament chiral honeycomb units are arranged in parallel and equidistantly, and the square rings of the chiral honeycomb units are aligned along the centroid, and the inclined straight rods connect the vertices of the aligned square rings in two adjacent layers , so as to form a three-dimensional space structure, in which four identical straight bars with inclined equal sections are connected between each square ring. These four straight rods form a group and form a rotation direction, and the rotation direction formed by each group of straight rods is exactly the...

Embodiment 2

[0029] Referring to Example 1, the difference is that the four-ligament chiral honeycomb unit can be replaced by a three-ligament chiral honeycomb unit (such as image 3 ), correspondingly, the square ring is replaced by a triangular ring or a hexagonal ring, and the number of inclined straight rods connected between layers is replaced by three. In the three-dimensional structure of the unit cell, two adjacent layers of completely identical triligament chiral honeycomb units are arranged in parallel and equidistantly, and the triangular rings of the chiral honeycomb units are aligned along the centroid, and the inclined straight rods align the triangles of the adjacent two layers The vertices of the rings are connected in pairs to form a three-dimensional space structure, in which three identical straight bars with inclined equal sections are connected between each pair of triangular rings. These three straight rods form a group and form a rotation direction, and the rotation ...

Embodiment 3

[0031] Referring to Example 1, the difference is that the four-ligament chiral honeycomb unit is replaced by a six-ligament chiral honeycomb unit (such as Figure 4 ), the corresponding place ring is replaced by a hexagonal ring, and the number of inclined straight rods connected between layers is replaced by six. In the unit cell three-dimensional structure, two adjacent layers of completely identical six-ligament chiral honeycomb units are arranged in parallel and equidistantly, and the hexagonal rings of the chiral honeycomb units are aligned along the centroid, and the inclined straight rods align the two adjacent layers. The vertices of the hexagonal rings are connected in pairs to form a three-dimensional space structure, in which six identical straight rods with inclined and equal cross-sections are connected between each pair of hexagonal rings. These six straight rods form a group and form a rotation direction, and the rotation direction formed by each group of straig...

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Abstract

The invention discloses a novel three-dimensional cellular metamaterial with a local tension-torsion coupling effect. The material is obtained by a space array of unit-cell three-dimensional structures, and the novel metamaterial is designed by additional arrangement of inclined rods in middles of chiral honeycomb plates; when a load perpendicular to the chiral honeycomb plates is applied to the material, the chiral honeycomb plates are driven to rotate due to deformation of the inclined rods, and the tension-torsion coupling effect is further generated. According to experimental and numericalsimulation analysis, the tension-torsion coupling effect of the material is more remarkable than that of an existing tension-torsion coupling material, and accordingly a promising application prospect in longitudinal wave / rotating wave conversion and tension-torsion component design can be achieved hopefully.

Description

Technical field: [0001] The invention relates to a new three-dimensional multicellular metamaterial with local tension-torsion coupling effect. Background technique: [0002] Metamaterials refer to composite materials that have artificially designed structures and exhibit extraordinary physical properties that natural materials do not have. In the field of mechanics, the most common metamaterials include negative Poisson's ratio materials, negative thermal expansion materials, etc. Negative Poisson's ratio materials and negative thermal expansion materials are materials whose Poisson's ratio or thermal expansion coefficient is negative. In 1987, Lakes et al. proposed a porous material with negative Poisson's ratio effect for the first time in science. After that, various forms of two-dimensional negative Poisson's ratio materials emerged in an endless stream, the most typical of which are concave hexagonal honeycomb and chiral honeycomb, etc. These structures are formed by...

Claims

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Application Information

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IPC IPC(8): B32B3/12B32B7/08
CPCB32B3/12B32B7/08
Inventor 富明慧胡玲玲郑彬彬钟荣昌
Owner SUN YAT SEN UNIV
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