Toughening Behavior in Whisker?Reinforced Ceramic Matrix Composites
Journal
Journal of the American Ceramic Society
Journal Volume
71
Journal Issue
12
Pages
1050-1061
Date Issued
1988
Author(s)
Abstract
The toughening behavior of whisker?reinforced ceramics is analyzed in terms of a whisker bridging zone immediately behind the crack tip. This approach is consistent with microscopy observations which reveal that intact bridging whiskers exist behind the crack tip as a result of debonding of the whisker?matrix interface. The theoretical results based on both the stress intensity and the energy change introduced by bridging whiskers reveal the dependence of toughening upon the composition and matrix, interface, and whisker properties. Furthermore, the analytical models of whisker bridging accompanied by very limited pullout accurately describe experimental observations of the toughening behavior in several SiC?whisker?reinforced ceramics. Such analytical descriptions also indicate that increases in whisker size and strength and modification of interface properties will result in further increases in toughness by whisker reinforcement. Copyright ? 1988, Wiley Blackwell. All rights reserved
SDGs
Type
journal article