CN-122024679-A - One-die metamaterial unit cell and one-die metamaterial

Abstract

The invention provides a metamaterial unit cell and a metamaterial, which belong to the technical field of elastic wave metamaterials, wherein the metamaterial unit cell is formed by arranging a plurality of units for a circle, the units comprise a connecting rod for adjusting equivalent rigidity and a balancing weight for adjusting equivalent density, and the rest parts are cavities; the connecting rod comprises an edge connecting rod positioned at the edge of the shape of the unit cell main body and a diagonal connecting rod positioned at the diagonal of the shape of the unit cell main body, wherein the balancing weights comprise a first balancing weight and a second balancing weight, the first balancing weight is arranged on the edge connecting rod, and the second balancing weight is arranged on the diagonal connecting rod. The invention provides a microstructure of a mold material having different macroscopic equivalent elastic properties and equivalent mass densities, whereby tuning of an anisotropic mold material to a near isotropic mold material can be achieved.

Inventors

• WEI YU
• HU GENGKAI

Assignees

• 北京理工大学

Dates

Publication Date

20260512

Application Date

20251204

Claims (10)

1. 1. A mould metamaterial unit cell is characterized by being formed by arranging a plurality of units in a circle, wherein the units comprise a connecting rod for adjusting equivalent rigidity and a balancing weight for adjusting equivalent density, and the rest part is a cavity, wherein: The connecting rod comprises an edge connecting rod positioned at the edge of the shape of the unit cell main body and a diagonal connecting rod positioned at the diagonal of the shape of the unit cell main body, wherein the balancing weights comprise a first balancing weight and a second balancing weight, the first balancing weight is arranged on the edge connecting rod, and the second balancing weight is arranged on the diagonal connecting rod.
2. 2. The one-die metamaterial unit cell according to claim 1, wherein the unit cell body is square or rectangular in shape.
3. 3. A unit cell according to claim 1, wherein the junction of the intersecting connecting rods is provided with a connection point.
4. 4. The single-piece metamaterial according to claim 1, wherein the connecting rod is a biconical rod or a straight rod.
5. 5. The one-die metamaterial unit cell according to claim 1, wherein the connecting rod and the balancing weight are made of aluminum alloy, titanium alloy or aluminum, or the connecting rod and the balancing weight are made of plastic or rubber, or the balancing weight is made of a first material, and the connecting rod is made of a second material.
6. 6. A unit cell according to claim 1, wherein each of said weights is not in contact with the other weights or the connecting rod.
7. 7. The die metamaterial unit cell according to claim 1, wherein the weight is round, square, triangular or polygonal with straight sides.
8. 8. The single metamaterial unit cell according to claim 4, wherein the balancing weight is rectangular, one symmetry axis of the rectangle is parallel to the axial direction of the diagonal biconic rod, and the center position of the balancing weight coincides with the center position of the diagonal biconic rod.
9. 9. A mold metamaterial, characterized in that the mold metamaterial is composed of a periodic microstructure composed of a plurality of mold metamaterial unit cells with the same size and structure as described in any one of claims 1 to 8.
10. 10. The one-mode metamaterial according to claim 9, wherein the one-mode metamaterial unit cell is composed of periodic microstructures formed by translating and copying the one-mode metamaterial unit cell along a lattice vector under the condition that the wavelength is greater than or equal to 10 and the lattice constant of the one-mode metamaterial unit cell is multiplied.

Description

One-die metamaterial unit cell and one-die metamaterial Technical Field The invention relates to the technical field of elastic wave metamaterial, in particular to a single-mode metamaterial unit cell and a single-mode metamaterial. Background The mechanical metamaterial is a metamaterial capable of regulating and controlling elastic properties and elastic waves, can greatly expand the selection range of material parameters, such as single negative materials, double negative materials and the like, and can realize complex regulation and control of the elastic waves, such as bending wave stealth, super-resolution imaging, wavefront regulation and the like. Mechanical metamaterial microstructures there is a microstructure that can manipulate elastic waves by virtue of their extreme quasi-static properties alone without introducing a resonance mechanism, called modal material microstructure. The microstructure of the pattern material contains easily deformable patterns, such as five patterns of easily deformable patterns called five patterns of material, and so on, and one pattern of easily deformable patterns called one pattern of material. Because the ideal mode material is unstable, the actual approximation can only be realized by using solid materials through special geometric structure design, and the approximation degree determines the difference degree between the designed materials and the fluctuation property of the ideal mode material. So far, research on pattern materials has focused mainly on the simplest five-pattern materials. For example, chinese patent CN108827459B discloses that underwater sound insulation can be achieved by using a five-mode material, chinese patent CN114284009B discloses sound topology insulators, chinese patent CN202110468875.4 discloses elastic wave splitting super surfaces, chinese patent CN115585913a discloses shear stress sensors, and the like. In addition, chinese patent No. cn2015110418800. X, chinese patent No. CN202310947227.6, chinese patent No. CN202111188382.1 disclose some typical five-die material microstructure designs. However, in addition to the above-described related studies on five-mode materials, there are few studies and reports on other mode materials, particularly on the microstructure of one-mode materials that can achieve different macroscopic equivalent elastic properties and equivalent mass densities. Disclosure of Invention In view of the above, the present invention provides a single-mold metamaterial unit cell and a single-mold metamaterial for solving the above-mentioned technical problems. In order to solve the technical problems, the first aspect of the invention provides a metamaterial unit formed by arranging a plurality of units for a circle, wherein the units comprise a connecting rod for adjusting equivalent rigidity and a balancing weight for adjusting equivalent density, and the rest part is a cavity, wherein: The connecting rod comprises an edge connecting rod positioned at the edge of the shape of the unit cell main body and a diagonal connecting rod positioned at the diagonal of the shape of the unit cell main body, wherein the balancing weights comprise a first balancing weight and a second balancing weight, the first balancing weight is arranged on the edge connecting rod, and the second balancing weight is arranged on the diagonal connecting rod. According to a preferred embodiment of the invention, the unit cell body is square or rectangular in shape. According to a preferred embodiment of the invention, the junction of the intersecting connecting rods is provided with a connection point. According to a preferred embodiment of the invention, the connecting rod is a biconical rod or a straight rod. According to a preferred embodiment of the invention, the connecting rod and the balancing weight are made of aluminum alloy, titanium alloy or aluminum, or the connecting rod and the balancing weight are made of plastic or rubber, or the balancing weight is made of a first material, and the connecting rod is made of a second material. According to a preferred embodiment of the invention, each of said weights is not in contact with the other weights or the connecting rod. According to a preferred embodiment of the invention, the weight is circular, square, triangular or polygonal with straight sides. According to a preferred embodiment of the invention, the balancing weight is rectangular, one symmetry axis of the rectangle is parallel to the axial direction of the diagonal biconic rod, and the center position of the balancing weight coincides with the center position of the diagonal biconic rod. In order to solve the above technical problems, a second aspect of the present invention provides a mold metamaterial, which is composed of a periodic microstructure composed of a plurality of mold metamaterial unit cells with the same size and structure as any one of the above. According to a preferred embodiment of the present invention, th