Paper number 217

INFLUENCE OF CRACK-WAKE DEBONDING IN CERAMIC MATRIX COMPOSITES

Yih-Cherng Chiang

Department of Mechanical Engineering, Chinese Culture University
No. 55, Hua-Kang Rd., Taipei, Taiwan

Summary

In this paper, the effect of interfacial debonding in the wake of a crack on the stress for matrix cracking is studied for the unidirectional fiber reinforced ceramic composites. A simple shear-lag model is adopted to calculate the stress and strain fields in the fiber and matrix. A criterion for crack-wake debonding is proposed by treating the debonding process as a particular crack propagation problem. Then, by using an energy balance approach the formulation of the steady-state matrix cracking stress of an infinite fiber-bridged crack can be derived. The analytical results show that the interfacial debonding toughness and the interfacially frictional sliding have significant influences on the matrix cracking stress. The theoretical results are compared with experimental data of SiC/borosilicate composite.

Keywords

interfacial debonding, matrix cracking, ceramic composites.