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Novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and design method thereof

A technology of thermal expansion coefficient and three-dimensional structure, applied in molecular design, chemical data visualization, computational theoretical chemistry, etc., can solve problems that have not been researched, and achieve the effect of large adjustment range and simple and convenient adjustment method

Pending Publication Date: 2021-02-26
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, structures with adjustable Poisson's ratio and thermal expansion coefficient have not yet been studied.

Method used

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  • Novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and design method thereof
  • Novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and design method thereof
  • Novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and design method thereof

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Embodiment 1

[0056] This embodiment discloses a design method of a novel three-dimensional structure with adjustable Poisson's ratio and coefficient of thermal expansion. Various novel three-dimensional structures can be constructed through the design method of the novel three-dimensional structure, such as a three-dimensional structure with zero Poisson's ratio. Three-dimensional structures with zero coefficient of thermal expansion in the x-axis and y-axis directions. The design method includes the following steps:

[0057] S1. Design a triangular unit. The longest bar and two oblique bars of the triangular unit have corresponding bar lengths and are made of three materials.

[0058] S2. Use two identical triangular units to assemble a parallelogram, see figure 1 Figure (a) in, and then build a three-dimensional cell based on four identical parallelograms (AA'D'D, ABCD, BB'C'C, A'B'C'D'), see figure 1 Figure (b) in and figure 2 .

[0059] Such as figure 2 As shown, the cell has th...

Embodiment 2

[0138] This embodiment discloses a computing device, including a processor and a memory for storing a program executable by the processor. When the processor executes the program stored in the memory, the Poisson's ratio and thermal expansion coefficient described in Embodiment 1 can be realized. The design method of the new three-dimensional structure tuned is as follows:

[0139] S1. Design a triangular unit, the longest bar and two oblique bars of the triangular unit have corresponding bar lengths and are made of three materials respectively;

[0140] S2. Using two identical triangular units to form a parallelogram, and then constructing a three-dimensional cell based on four identical parallelograms;

[0141] S3. Taking the direction of one side of the parallelogram on the bottom surface of the three-dimensional cell as the left-right direction, arrange the three-dimensional cells periodically along this direction, and repeatedly mirror along the front-back direction and t...

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Abstract

The invention discloses a novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and a design method thereof, and the method comprises the following steps:firstly, selecting different triangular unit geometric parameters and material combinations, designing a triangular unit based on three materials, and then splicing two same triangular units into a parallelogram, constructing a three-dimensional cell element based on four same parallelograms; periodically arranging the three-dimensional cell elements in the direction where the horizontal straightrods are located and repeatedly performing mirroring in the other two directions, and finally obtaining the novel three-dimensional truss structure; and then performing mechanical analysis on a three-dimensional cell element of the three-dimensional truss structure, solving an equivalent formula of elastic parameters and a thermal expansion coefficient of the three-dimensional truss structure through a displacement method and a unit load method, and calculating a corresponding poisson ratio and a thermal expansion coefficient based on the equivalent formula. By selecting reasonable geometrical parameters and material combination, the Poisson's ratio and the thermal expansion coefficient of the three-dimensional mechanical metamaterial can be regulated and controlled in a large range.

Description

technical field [0001] The invention relates to the technical field of novel three-dimensional structures, in particular to a novel three-dimensional structure with adjustable Poisson's ratio and thermal expansion coefficient and a design method thereof. Background technique [0002] Negative Poisson's ratio materials expand laterally when stretched and contract laterally when compressed. Due to their unique properties, they have incomparable advantages in many aspects. Moreover, the physical and mechanical properties such as shear modulus, indentation resistance and fracture resistance of negative Poisson's ratio materials have a lot of room for improvement. [0003] Negative thermal expansion materials refer to a class of materials that expand abnormally with temperature changes in a certain temperature range, and have the opposite characteristics to general thermal expansion and cold contraction materials. Through the doping and compounding of materials with different ex...

Claims

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Application Information

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IPC IPC(8): G16C20/50G16C20/20G16C20/80G16C20/90G16C60/00G16C10/00
CPCG16C10/00G16C20/20G16C20/50G16C20/80G16C20/90G16C60/00
Inventor 蓝林华富明慧陈明明黄泽彬
Owner GUANGZHOU UNIVERSITY
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