Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment

Abstract

The invention discloses a detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment and aims to solve the technical problem that the prior detection method of damage of the one-way silicon carbide (SiC) / SiC composite is bad in accuracy. The technical scheme is that an oxidizing reaction kinetics equation is applied to calculate the thickness of oxidation loss of a carbon interface in the composite material microstructure oxidation process and acquire a geometric model under different oxidation times of the composite microstructure; a finite element model of the composite microstructure after being oxidized is built to conduct finite element calculation of microcosmic stress; and maximum stress strength criterions are adopted to detect damage conditions of materials. The detection method of damage of the one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in the oxidation environment is simple and high-efficiency from the molding process to the calculation process, overcomes the defects that the prior experimental method is high in cost and long in time consumption, acquires the microcosmic stress in the microstructure of the composite after being oxidized with the help of the strong finite element analysis function of ANSYS; improves accuracy of damage analysis of the one-way SiC / SiC composite and solves the problem that the mesomechanics model is low in accuracy.

Description

technical field [0001] The invention relates to a damage detection method of a silicon carbide fiber toughened silicon carbide ceramic matrix composite material, in particular to a damage detection method of a unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in an oxidizing environment. Background technique [0002] Silicon carbide fiber toughened silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, hereinafter referred to as SiC / SiC) have excellent properties such as high temperature resistance, low density, high specific strength, and high specific modulus, making it a One of the irreplaceable new high-temperature structural materials, widely used in aviation and aerospace engine hot-end parts, aerospace round-trip heat protection system, high-speed brakes, gas turbine hot-end parts, high-temperature gas filtration and heat exchangers, etc., its working environment ...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the deficiency of the existing unidirectional SiC / SiC composite material damage detection method with poor precision, the present invention provides a damage detection method of unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in an oxidizing environment

It can improve the accuracy of damage analysis of unidirectional SiC / SiC composite material damage detection method, and solve the technical problem of low precision of mesoscopic mechanical model

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