Stable debonding process

From the discussion presented above, it is clear that the stability of the debond process can be evaluated by a single parameter, Zmax, which is the shortest (remaining) bond length needed to maintain the debond process stable, and is a constant for a given composite system. Therefore, three different interface debond processes are identified in the following totally unstable, partially stable and totally stable debond processes. The schematic plots of the applied stress versus displacement curves are illustrated in Fig. 4.25 for these debond processes. 

Fig. 4.25. Schematic presentations of applied stress versus displacement (

One can easily note that Eq. (4.138) is similar to the solution given by Eq. (4.126), which is derived from the assumption of a constant friction and complete neglect of the Poisson expansion. The solution for Zma, which is the shortest bond length required to maintain a stable debonding process, is obtained from Eq. (4.137)... 

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