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R ‐curve measurements were performed on a SiC whisker/Al 2 O 3 matrix composite. A controlled flaw/strength technique was utilized to determine fracture resistance as a function of crack extension. Rising R ‐curve behavior with increasing crack extension was observed, confirming the operation of wake toughening effects on the crack growth resistance. Observations of crack/microstructure interactions revealed that bridging by intact whiskers in the crack wake was the mechanism responsible for the rising R ‐curve behavior.
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Homeny et al. (1990) studied this question.
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