Page 277 - Engineered Interfaces in Fiber Reinforced Composites

258 Engineered interfaces in fiber reinforced composites

interface

Fig. 6.13. The Cook-Gordon (1964) mechanisms: tensile debonding occurs at the weak interface ahead of
crack tip as a result of lateral stress concentration and crack tip is effectively blunted.

Fig. 6.14. Blunted crack tip and longitudinal splitting in unidirectional continuous fiber composites. After
Tirosh (1973).

(6.18)

where z1 and 22 are complex variables that are functions of the coordinate directions
x and y, and complex constants kl and kz:

ZI =x+kly, z2 =x+ k2Y . (6.19)