A Numerical Simulation of the R-Curve Behavior in Microcracking Materials

Several models are proposed for crack propagation in ceramic materials with microcrack formation and coalescence. The models differ in the relative time scales involved in the internal relaxation processes and the external loading rate. When the external loading rate is very high, a rising R-curve i...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 1990-07, Vol.70 (1), p.158-166
Main Authors: Murat, M, Englman, R, Jaeger, Z
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Several models are proposed for crack propagation in ceramic materials with microcrack formation and coalescence. The models differ in the relative time scales involved in the internal relaxation processes and the external loading rate. When the external loading rate is very high, a rising R-curve is obtained. For slow external loading, the results depend upon the relative rate of the different internal relaxation processes and upon the distribution of the critical stresses needed to form the microcracks. In this regime, the existence of a rising R-curve behavior is found to be primarily due to microcrack shielding. Graphs. 34 ref.--AA
ISSN:0021-8979