Subcritical crack growth in CVISiCf/SiC composites at elevated temperatures:: Dynamic crack growth model

被引：22
作者：
Henager, CH
Hoagland, RG
机构：
[1] Pacific NW Natl Lab, Mat Sci P815, Richland, WA 99352 USA
[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
来源：
ACTA MATERIALIA | 2001年 / 49卷 / 18期
关键词：
computer simulation; ceramics; -; structural; composites; mechanical properties - creep; high temperature;
D O I：
10.1016/S1359-6454(01)00277-4
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A dynamic crack-growth model has been developed to predict slow crack growth in ceramic composites containing nonlinear, creeping fibers in an elastic matrix. Mechanics for frictional bridging and nonlinear fiber-creep equations are used to compute crack extension dynamically. Discrete, two-dimensional fiber bridges are employed, which allows separate bridge "clocks", to compute slow crack-growth rates for composites containing Nicalon-CG and Hi-Nicalon fibers. Predictions for activation energies, time-temperature exponents, crack lengths, and crack-velocity data for composites in bending at 1173 K to 1473 K in inert environments are in good agreement with experimental data. In addition, calculated creep strains in the bridges agree with experimental damage-zone strains. The implications of multiple-matrix cracking are discussed. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
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收藏
页码：3739 / 3753
页数：15
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