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A Method for Failure Analysis of Composite Structures Based on Mesomechanical Degradation Model

A technology of composite materials and mesomechanics, applied in analytical materials, scientific instruments, special data processing applications, etc., can solve problems such as stress reduction

Inactive Publication Date: 2015-11-18
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main acting stresses that lead to material failure are reduced by the stiffness degradation coefficient

Method used

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  • A Method for Failure Analysis of Composite Structures Based on Mesomechanical Degradation Model
  • A Method for Failure Analysis of Composite Structures Based on Mesomechanical Degradation Model
  • A Method for Failure Analysis of Composite Structures Based on Mesomechanical Degradation Model

Examples

Experimental program
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Effect test

Embodiment 1

[0101] Example 1: Failure Analysis of Composite Mechanical Connection Structure

[0102] Such as image 3 As shown, the composite material mechanical connection structure is composed of 3 identical composite material orifice plates and 2 titanium alloy tension-resistant convex head high-lock bolts. Composite laminates were prepared using prepreg CYCOMX850-35-12KIM+-190.

[0103] 1. Establish a three-dimensional finite element model of the connection structure in the finite element software ABAQUS according to the structural parameters of the composite material bolt connection, fully constrain the free ends of the two outer laminates, and impose displacement constraints on the free ends of the middle laminate;

[0104] 2. Establish contact pairs between the bolt cap and the laminate, between the nut and the laminate, and between the bolt column and the laminate bolt hole in the three-dimensional finite element model;

[0105] 3. Use the Fortran language to program the establi...

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Abstract

The invention relates to a composite material structure failure analysis method based on mesomechanics degradation model, and three dimensional basic material performances of the composite material are input parameters, and material performances of the composite material after damage are obtained by mesomechanics calculating method, and seven common failure modes are taken into consideration, which comprise: fiber stretch, fiber compression, matrix stretch, matrix compression, fiber-matrix shearing, layered stretch and layered compression, and finally the material degradation mode in composite material progressive damage analysis is obtained for carrying out failure analysis of the composite material structure; the invention not only can accurately predict structure failure, but also can predict failure mode and position of the structure. According to the composite material structure failure analysis method based on mesomechanics degradation model provided by the invention, the material degradation model is obtained by theory analysis, thereby connecting macroscopic failure and microscomic mechanism of composite material, and compared to the present material degradation model based on experience or test, time and test cost are substantially reduced.

Description

technical field [0001] The invention relates to failure strength and failure mode analysis of composite material structures, and is applicable to various complex composite material structures widely used in aerospace vehicles. Background technique [0002] Composite materials are more and more widely used in aerospace vehicle structures due to their excellent characteristics such as high specific strength, high specific stiffness, designable performance, and easy integral molding. The force structure is extended to the main load-bearing structure. Therefore, the composite material structure occupies an increasingly important position in the overall structure of the aircraft, and the failure analysis of the composite material structure is very important for both the aircraft structure design and the strength check. However, unlike metal materials, composite materials have the characteristics of anisotropy and low interlaminar strength, which make the structural failure analy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/00G06F19/00
Inventor 张建宇周龙伟山美娟陈玉丽赵丽滨
Owner BEIHANG UNIV
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