Complex composite material structure equivalent material performance multi-scale calculating method

Abstract

The invention provides a complex composite material structure equivalent material performance multi-scale calculating method comprising the following steps: using a scale-separating method to separate the structure into macroscopic, microscomic and microscopic scales, and respectively building analysis models on each scale according to geometry characteristics of different scale models; converting the three-scale problem into two multi-scale problems: a macroscopic-microscomic multi-scale problem and a microscomic-microscopic multi-scale problem, analyzing the two multi-scale problems in sequence, and finally returning an equivalent modulus of the microscopic multiple-scale problem to the macroscopic multiple-scale problem. A conventional structure analysis method is low in calculating efficiency and poor in precision; the novel complex composite material structure equivalent material performance multi-scale calculating method can solve said problems, thus effectively improving composite material structure performance prediction efficiency and precision, and the novel method can be applied to composite material production, research and development guiding works; the complex composite material structure equivalent material performance multi-scale calculating method can be applied to aviation spaceflight field complex composite material structure design and analysis, and structure design thermal and mechanics analysis in other composite material engineering fields.

Description

technical field [0001] The invention relates to the field of composite material design, and relates to a complex composite material structure analysis and design method, in particular to a complex composite material structure equivalent material performance multi-scale calculation method. Background technique [0002] Due to the characteristics of light weight, high strength and strong designability, composite materials are widely used in aerospace structural devices. Due to the complex structure of composite materials, in order to study the performance of composite materials and improve the use efficiency of composite structural parts, scholars at home and abroad have proposed a large number of theories to predict the behavior of composite materials in the past century. Its core is to determine the distribution of physical quantities such as displacement and temperature inside the structure by solving the governing equations, so as to complete the prediction of material pro...

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Problems solved by technology

[0007] However, the existing multi-scale methods only consider two-scale information. Since most composite materials are in the form of plies, the mesoscale of the material is not a simple combination of fibers and matrix, but a combination of multiple fibers and matrix. The ply angle of the fiber and the arrangement of each fiber will greatly affect the performance of the macroscopic material

In addition, most of the multi-scale analysis software users are developed by foreign aerospace scientific research institutions. Due to various reasons, these software are not open to the public, and most of the programs used for academic research are limited due to problems such as accuracy and calculation cost. Applications in the field

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