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WO2020143075A1 - Nouveau métamatériau tridimensionnel à cellules multiples ayant un effet de couplage à torsion-traction localisé - Google Patents

Nouveau métamatériau tridimensionnel à cellules multiples ayant un effet de couplage à torsion-traction localisé Download PDF

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Publication number
WO2020143075A1
WO2020143075A1 PCT/CN2019/072319 CN2019072319W WO2020143075A1 WO 2020143075 A1 WO2020143075 A1 WO 2020143075A1 CN 2019072319 W CN2019072319 W CN 2019072319W WO 2020143075 A1 WO2020143075 A1 WO 2020143075A1
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dimensional
coupling effect
metamaterial
novel
replaced
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English (en)
Chinese (zh)
Inventor
富明慧
胡玲玲
郑彬彬
钟荣昌
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Sun Yat Sen University
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Sun Yat Sen University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means

Definitions

  • the invention relates to a novel three-dimensional multicellular metamaterial with local tension-torsion coupling effect.
  • Metamaterials refer to composite materials that have artificially designed structures and exhibit extraordinary physical properties that natural materials do not possess.
  • the most common metamaterials include negative Poisson's ratio materials and negative thermal expansion materials.
  • Negative Poisson's ratio materials and negative thermal expansion materials are materials whose Poisson's ratio or coefficient of thermal expansion is negative.
  • Lakes et al. first proposed a porous material with negative Poisson's ratio effect in science. After this, various forms of two-dimensional negative Poisson's ratio materials emerged endlessly, among which the most typical are concave hexagonal honeycomb and chiral honeycomb. These structures are obtained by mesoscopic cell wall bending or ligament winding. Realize the macroscopic negative Poisson's ratio effect.
  • Frenzel is equivalent to using the tensile-shear coupling effect of the four-ligament chiral honeycomb in 2017. Through space assembly, a new metamaterial with tensile and torsional coupling effect has been designed.
  • the tension-torsion coupling effect is a unique mechanical effect, which means that when the material is stretched or compressed in a certain direction, it will cause torsional deformation around that direction. This peculiar nature can be applied in many ways, such as the conversion of mechanical waves between longitudinal and rotary waves, and the conversion of micro-mechanical transmission methods.
  • Frenzel et al. found that the tension-torsion coupling effect of the material they designed had a significant dependence on the number of structural cells. When the number of cells increased, the tension-torsion coupling effect decreased rapidly.
  • the present invention was completed under the support of the National Natural Science Foundation of China (funding number 11672338).
  • the object of the present invention is to provide a new three-dimensional multicellular metamaterial with stronger local tension-torsion coupling effect.
  • a novel three-dimensional multi-cell metamaterial with local tension-torsion coupling effect is obtained from a three-dimensional structure of unit cells through a spatial array.
  • the three-dimensional structure of unit cells passes through a square ring of two identical four-ligament chiral honeycomb units above and below.
  • each group of straight rods There are four inclined straight rods connected to the vertex of each other ring, forming a group and forming a rotation direction, and the rotation direction formed by each group of straight rods is the same.
  • this structure is subjected to a load perpendicular to the chiral honeycomb unit, due to the deformation of the inclined straight rod, it will cause relative twisting between adjacent two layers of honeycomb units. Since the rotation direction of each set of inclined straight rods is the same, the direction of the torsion is also the same, so these torsions will be superimposed and transmitted in the direction perpendicular to the honeycomb unit, thereby causing the tension and torsion coupling effect of the entire structure.
  • the square ring of the four-ligament chiral honeycomb unit is replaced with a ring or a square plate or a disc.
  • the four-ligament chiral honeycomb unit can be replaced with a three-ligament chiral honeycomb unit, the corresponding ring is replaced with a triangular ring, and the number of inclined straight rods connected between layers is replaced with three.
  • the four-ligament chiral honeycomb unit is replaced with a six-ligament chiral honeycomb unit, the corresponding ring is replaced with a hexagonal ring, and the number of inclined straight rods connected between layers is replaced with six.
  • the four-ligament chiral honeycomb unit can be replaced with a square mesh unit.
  • the base material prepared by the three-dimensional structure may be metal, polymer material or other composite materials, and is not limited to ABS photosensitive resin.
  • the present invention designs a new type of metamaterial by adding a tilting rod in the middle of the chiral honeycomb panel.
  • the chiral honeycomb panel will be rotated due to the deformation of the inclined rod, thereby generating a tension-torsion coupling effect.
  • Experimental and numerical simulation analysis show that the material has a significant effect of tension and torsion coupling.
  • the tension-torsion coupling effect of the present invention is significantly larger than the existing structure, so it has more application prospects, and it is expected to have greater application prospects in longitudinal wave/rotational wave conversion and tension-torsion member design.
  • the diffusion capacity of the local tension-torsion coupling effect of the structure of the present invention will not decrease rapidly with the increase of the number of cells. When the number of cells in the section of the columnar specimen reaches 25 ⁇ 25, the specimen can still Maintain a great tension-torsion coupling effect.
  • FIG. 1 is a schematic diagram of a three-dimensional tension-twist structure according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the three-dimensional structure of the unit cell of the three-dimensional tension-twist structure of FIG. 1;
  • Embodiment 2 of the present invention is a schematic structural view of Embodiment 2 of the present invention.
  • Embodiment 3 of the present invention is a schematic structural diagram of Embodiment 3 of the present invention.
  • Embodiment 4 of the present invention is a schematic structural view of Embodiment 4 of the present invention.
  • Example 6 is the experimental result of Example 1 of the present invention.
  • Example 7 is a schematic structural view of Example 5 of the present invention.
  • Embodiment 6 of the present invention is a schematic structural diagram of Embodiment 6 of the present invention.
  • a novel three-dimensional multi-cell metamaterial with local tension-torsion coupling effect is obtained from a three-dimensional structure of unit cells through a spatial array.
  • the three-dimensional structure of unit cells is formed by chiral honeycomb in two identical four ligaments. By adding inclined straight rods between the square rings of the unit, in the three-dimensional structure of the unit cell (as shown in FIG.
  • the four-ligament chiral honeycomb unit can be replaced with a three-ligament chiral honeycomb unit (as shown in FIG. 3). Accordingly, the square ring is replaced with a triangular ring or a hexagonal ring, between layers The number of connected inclined straight rods is replaced by three.
  • two adjacent layers of identical tri-ligament 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 will align the adjacent two layers of triangles.
  • the vertices of the rings are connected two by two to form a three-dimensional space structure, in which three identical inclined straight rods of equal cross section are connected between each pair of triangular rings. These three straight rods form a group and form a rotation direction, and the rotation direction formed by each group of straight rods is exactly the same.
  • this structure is subjected to a load perpendicular to the chiral honeycomb unit, due to the deformation of the inclined straight rod, it will cause relative twisting between adjacent two layers of honeycomb units.
  • Example 1 the difference is that the four-ligament chiral honeycomb unit is replaced with a six-ligament chiral honeycomb unit (as shown in FIG. 4), the corresponding ring is replaced with a hexagonal ring, and the number of inclined straight rods connected between layers Replace with six.
  • the three-dimensional structure of the unit cell two adjacent layers of identical six-ligament chiral honeycomb units are arranged in parallel and equidistant, and the hexagonal rings of the chiral honeycomb units are aligned along the centroid.
  • 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 of equal cross section are connected between each pair of hexagonal rings.
  • the difference is that the four-ligament chiral honeycomb unit can be replaced with a square grid-like unit (see FIG. 5).
  • Example 1 the difference is that the square ring in the four-ligament chiral honeycomb unit is replaced by a ring (see FIG. 7).
  • Example 1 the difference is that the square ring in the four-ligament chiral honeycomb unit is filled with a solid interior (see FIG. 8).

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  • Mechanical Engineering (AREA)
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Abstract

La présente invention concerne un nouveau métamatériau tridimensionnel à cellules multiples qui a un effet de couplage à torsion-traction localisé, le matériau étant obtenu au moyen d'un réseau spatial de structures tridimensionnelles à une seule cellule ; un nouveau métamatériau est conçu au moyen de l'ajout de tiges inclinées entre des plaques en nid d'abeilles chirales ; lors de la réception d'une charge qui est perpendiculaire aux plaques en nid d'abeilles chirales, le matériau amène les plaques en nid d'abeilles chirales à tourner en raison de la déformation des tiges inclinées, ce qui produit un effet de couplage à torsion-traction. L'analyse de simulation expérimentale et numérique démontre que l'effet de couplage à torsion-traction du matériau selon l'invention est plus significatif que celui des matériaux de couplage à torsion-traction existants, le matériau présente donc des perspectives d'application prometteuses dans la conversion d'onde verticale/onde rotative et dans la conception d'un composant de torsion-traction.
PCT/CN2019/072319 2019-01-10 2019-01-18 Nouveau métamatériau tridimensionnel à cellules multiples ayant un effet de couplage à torsion-traction localisé Ceased WO2020143075A1 (fr)

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CN201910022038.1 2019-01-10
CN201910022038.1A CN109822981A (zh) 2019-01-10 2019-01-10 一种具有局部拉扭耦合效应的三维多胞新型超材料

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CN116292710A (zh) * 2023-02-27 2023-06-23 广州大学 一种手性压扭负泊松比结构的制备方法
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