Calculation method for damage and evolution failure of interlaminar toughened composite

Abstract

In the invention, a physical model which can reflect the interlaminar toughening of non-woven fabrics is introduced into the failure analysis of fibrous composites, and a calculation method for predicting the delamination damage generation and evolution failure process of interlaminar toughened composites of the non-woven fabrics is established. According to the invention, the type I damage of aninterlaminar toughened composite is tested so as to obtain the basic parameters of a toughened-layer material, and a composite delamination failure model capable of reflecting the actual thickness ofa toughened layer is established; and a finite element analysis method is adopted for low-cost high-efficiency analysis of the damage evolution rules of the interlaminar toughened composite of the non-woven fabric so as to obtain optimal toughening parameters, which provide support for research on the interlaminar toughening mechanisms of the non-woven fabric.

Description

technical field [0001] The invention relates to a calculation method of material damage and evolution failure: the strength theory is used to predict the generation of delamination damage of the toughening layer between non-woven fabrics, and the expansion of macro delamination cracks at the interface is predicted by the energy release criterion, which is applicable The calculation of the parameters of the toughening layer and the display of the evolution process of the interfacial stress during the preparation of the non-woven interlayer toughened composite material. Background technique [0002] Interlayer toughening technology can greatly improve the toughness of composite materials, the key lies in the selection of interlayer toughening materials. At present, non-woven fabrics with high porosity structure have become a research hotspot in recent years as interlayer toughening materials. Due to the anisotropy of composite materials, a comprehensive and systematic analysi...

AI Technical Summary

Problems solved by technology

Due to the anisotropy of composite materials, a comprehensive and systematic analysis of non-woven interlayer toughened composite materials by experimental means is facing the reality of long cycle and high cost.

Analytical methods such as J integral are limited to two-dimensional planar structures, and cannot calculate the energy release rate of complex three-dimensional laminates

Existing finite element models cannot effectively characterize the physical properties of the nonwoven fabric toughening layer, especially the thickness of the nonwoven fabric

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