SEDL / STP / STP1080-EB / STP25394S

Toughness Models of Whisker-Reinforced Ceramic Matrix Composites

Chiang, Y-C
Research assistant and professor, Center for Composite Materials and Department of Mechanical Engineering, University of Delaware, Newark, DE

Chou, T-W
Research assistant and professor, Center for Composite Materials and Department of Mechanical Engineering, University of Delaware, Newark, DE

Pages: 15    Published: Jan 1990

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Abstract

This paper presents a theoretical investigation of the critical strain energy release rate, Gc, of whisker-reinforced ceramic matrix composites. Crack deflection is considered as the major energy dissipation mechanism in fracture. The modeling of crack deflection is conducted based on a determination of the path of advancement of the deflected crack front along whiskers. The knowledge of crack path provides the basis for evaluating the deflection-induced reduction in strain energy release rate. The theoretical predictions are compared with experimental data of silicon-carbide (SiC) whisker-reinforced Al²O³ composites.