An asymptotic approach for debonding at the fiber-matrix interface

The debond stress at the fiber-matrix interface based on the critical energy release rate criterion has been analyzed previously by using both simple and rigorous approaches. Only the rigorous approach can yield the dependences of the debond stress on all the essential material properties and dimensions. However, the analytical procedures in deriving a rigorous solution are complicated, and the trends of these dependences cannot be readily visualized from the lengthy analytical expression of the debond stress. A simple asymptotic approach is adopted in the present study to derive the debond stress, and to elucidate the trends of these dependences; especially, the dependence on the embedded fiber length. ? 1994.