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growth and damage tolerance. It was found that the stable crack growth occurred according to the following procedures: (i) first matrix cracking and/or interface debonding near the notch tip, which were induced and promoted by the residual stress and the ƒÀ-phase depleted zone near the interface, (ii) the increase of density of matrix cracking, resulting in crack face bridging by intact fibers, (iii) the break of some bridging fibers, and finally (iv) unstable fracture, accompanying with the coalescence of cracks and with fiber pull-out. A significant increase in fracture resistance with stable crack growth was observed, in which fiber bridging was found to play the most important role. Not only the critical stress intensity factor but also the critical J-integral value at which unstable fracture occurred were inadequate as fracture criteria, because they did not show a unique value, or varied with the initial crack length, ai and with the relative ratio, ai/W. But instead, the significance of the slope in R-curve, which must give the developing rate of fiber bridging with stable crack growth, was identified as a useful material parameter which represents the degree of damage tolerance of composites.

Stable Crack Growth Process in Unidirectional SiC Fiber Reinforced Ti-24Al-11Nb Matrix Composite.