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Mixed-Mode Fracture Criterion of Short Carbon Fiber-Dispersed SiC Matrix Composite

R. Inoue, J.-M. Yang, J.-M. Yang, H. Kakisawa, Y. Kagawa, Y. Kagawa

Journal of Ceramic Science and Technology, Vol. 8, No. 2 (2017), pp. 223-232

DOI: 10.4416/JCST2016-00108

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Abstract

Fracture toughness tests for short carbon fiber-dispersed SiC matrix (SCF/SiC) composites fabricated by means of the silicon melt infiltration (MI) process have been carried out under mode I, mode II and mixed I/II mode loading conditions. A Brazilian disk specimen was used for the mixed-mode fracture toughness test. The results showed that the fracture toughness under mixed I/II mixed-mode loading conditions was substantially higher than that under mode I loading. The relationship between mixed-mode fracture toughness and the mode mixity parameter was found to be in agreement with the generalized maximum tangential stress (G-MTS) criterion. Compressive T-stress acting parallel to the notch direction plays an important role in affecting the mixed-mode fracture toughness of SCF/SiC composite using Brazilian disk specimens.

Keywords

Composite, carbon fiber, SiC, toughness, mixed mode

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