Nonlinear constitutive relation analysis method, system and device for negative poisson ratio structure

Abstract

The invention discloses a nonlinear constitutive relation analysis method, a system and a device for a negative poisson ratio structure. The method comprises the following steps: acquiring a unit cellwith a concave honeycomb structure; carrying out deformation analysis on the unit cell; obtaining a correction factor according to a deformation analysis result; establishing a nonlinear constitutiverelation of the concave honeycomb structure according to the correction factor; and designing and producing a corresponding structure according to the nonlinear constitutive relation. By using the method provided by the invention, the design, production and manufacturing processes are more convenient in a scene with special requirements on materials or structures, the design period of the productis further shortened, and the method provided by the invention has better calculation precision and application range compared with a numerical method and a test method in the prior art. The method can be widely applied to the technical field of material science.

Description

technical field [0001] The invention relates to the technical field of material science, in particular to an analysis method, system and device for the nonlinear constitutive relation of a negative Poisson's ratio structure. Background technique [0002] Negative Poisson's ratio: It means that when stretched, the material expands laterally within the elastic range; when compressed, the material shrinks laterally. [0003] Cell: The smallest structural unit in a multicellular structure, such as in a honeycomb structure, a unit surrounded by each small hole is called a cell. [0004] Bending moment: A type of internal moment on the section of a stressed member. [0005] The honeycomb structure is a good lightweight structure due to its characteristics of high specific strength, high specific stiffness, good heat and sound insulation performance, and strong energy absorption. The microstructure of the honeycomb is different, and the macroscopic mechanical and physical propert...

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Problems solved by technology

[0006] Most of the above studies are based on experiments or numerical simulations. The concave honeycomb structure is generally regarded as an anisotropic material with periodic characteristics. In engineering design and analysis, complex geometric forms and anisotropic mechanical properties make the honeycomb structure Experimental design and analysis are time consuming and uneconomical

With the development of computing scien

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