Abstract
The debonding behavior of fibers strongly affects the properties of fiber-reinforced composites. In the literature, two different approaches to the fiber debonding problem have been developed. In strength-based approaches, interfacial debonding is assumed to occur once an interfacial strength is reached. In fracture-based approaches, the debonded interfacial zone is regarded as a tunnel crack which grows in size once an interfacial toughness is overcome at the crack tip. In this communication, the conditions for validity of these two different approaches will be discussed with respect to different possible stress distributions along the interface. A method to determine which approach is appropriate for a given composite system will be suggested.
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