Debonded morphology

Figure 10.10 Debonded morphology and schematic representation of debonding growth. Reproduced with permission from Ref. [69] 1997, Elsevier.

Three underlying mechanisms are responsible for the nonlinearity.17,18 (1) Frictional dissipation occurs at the fiber/matrix interfaces, whereupon the sliding resistance of debonded interfaces, r, becomes a key parameter. Control of t is critical. This behavior is dominated by the fiber coating, as well as the fiber morphology.19,20 By varying r, the prevalent damage mechanism and the resultant non-linearity can be dramatically modified. (2) The matrix cracks... 

Kim and Michler have observed the relationship between morphology and strain micromechanisms in cases of both rigid and elastomeric filler growth of voids, by cavitation or debonding [7,31]. Oshyman has reported a transition, at a certain fraction of filler, correlated to the evolution from macroscopic homogeneous strain to micromechanisms such as crazes. It is in fact a transition between independent mode and correlated mode of strain micromechanims [32]. 

As to BD16, different characters on the morphology of cryofractured surfaces are remarked. The interfacial debonding can be seen only when the true strain reaches a... 

---