A FATIGUE CRACK-GROWTH MODEL FOR FIBER-REINFORCED METAL MATRIX COMPOSITES

被引：6

作者：

CHAN, KS

机构：

[1] Southwest Research Institute, San Antonio, Texas

来源：

FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 1990年 / 13卷 / 02期

关键词：

D O I：

10.1111/j.1460-2695.1990.tb00588.x

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A fracture‐mechanics based model is proposed for fatigue crack growth in fiber‐reinforced metal‐matrix composites (MMCs). The model incorporates most of the fracture micromechanisms commonly observed in fiber‐reinforced MMCs, including (1) formation of microcracks ahead of the crack tip by either fiber fracture or interface decohesion, (2) interactions of the main crack tip with fibers and microcracks, (3) linkage of the main crack with microcracks, and (4) crack deflection by fibers. Statistical variations of fiber or interface strength are also considered. The essential feature of the model is to compute the changes in the local stress intensity due to various fracture mechanisms; the local stress intensity is then utilized to predict crack growth rate in MMCs via an elastic modulus normalization procedure. Application of the model to predicting crack growth in an alumina fiber Mg‐alloy composite is presented. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：171 / 183

页数：13

共 27 条

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