Multi-scale calculation method for equivalent thermal expansion coefficient of complicated composite material structure

Abstract

The invention provides a multi-scale calculation method for an equivalent thermal expansion coefficient of a complicated composite material structure. According to the method, a scale separation method is adopted to separate a macro-scale structure, a meso-scale structure and a micro-scale structure, and all scale analysis models are established according to geometric characteristics of different scale models; a three-scale problem is converted into two multi-scale problems; a macro-meso multi-scale problem and a meso-micro multi-scale problem are analyzed in sequence, and an equivalent modulus obtained from a micro multi-scale problem is finally returned to a macro multi-scale problem. Through the method, the defects of low calculation efficiency and poor precision of traditional structure analysis methods are overcome, the efficiency and precision of structure performance prediction of a composite material are effectively improved, and the method can be used for guiding production, research and development and other work of the composite material. The method can be applied to complicated composite material structure design and analysis in the aerospace field and structural design thermal and mechanical 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, specifically a multi-scale method for calculating the equivalent thermal expansion coefficient of complex composite material structures. 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 predictio...

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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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