Composite material structural strength analysis method considering fiber weaving damage

Abstract

The invention provides a composite material structural strength analysis method considering fiber weaving damage. In the preparation process of the composite material structure, the fiber is damaged due to overlarge curvature by a preform weaving process, and therefore the local strength is reduced. According to the method, the influence of fiber weaving damage is considered, the influence rule ofthe fiber curvature radius on the strength of the fiber is given, when finite element analysis is conducted on the composite material structure, the curvature radius of each unit is obtained, the actual strength of each unit is calculated according to the curvature radius of each unit, and the structural strength analysis precision can be greatly improved.

Description

technical field [0001] The invention belongs to the field of performance analysis of composite materials, and in particular relates to a method for analyzing the structural strength of composite materials considering fiber weaving damage. Background technique [0002] Fiber-reinforced composite materials have the advantages of high specific strength, high specific modulus, superior fatigue resistance and environmental resistance, and are widely used in aerospace and other fields. When used as a load-bearing structure, it is a basic requirement for a composite material structure not to be damaged in the service environment. Therefore, accurate strength analysis is an essential link in the design process of a composite material structure. At present, when analyzing the structure of composite materials, the stiffness and strength properties of the material are often obtained through experiments or theoretical calculations, and then the finite element calculations are performed ...

AI Technical Summary

Problems solved by technology

[0003] During the preparation of structures in composite materials, the weaving process of the prefabricated body will cause damage to the fibers in some parts due to excessive curvature, thereby reducing the local strength

However, in the current strength analysis of composite material junctions, the general strength properties of materials are often obtained through standard mechanical tests or theoretical calculations, and on this basis, the finite element analysis of the structure is carried out (such as literature [Wang Jiao, Wang Chenghua, Yang Yang , et al. Progressive damage analysis of C / SiC composite bushings. Strength and Environment, 2016, 43(05): 30-37.] and [Sun Jie. Integrated optimization design of braided composite structure and materials. Nanjing University of Aeronautics and Astronautics , 2010.]), without considering fiber weaving damage, which increases the error of structural strength analysis results

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