On the penny-shaped crack in a nonhomogeneous interlayer of adjoining two different elastic materials

torsional problem of a penny-shaped crack at the interface between two distinctly different materials is investigated by presenting the generalized interlayer model. Dislocation density function and integral transform are used to reduce the problem to the singular integral equation. Numerical examples are given to show the effects of the interlayer thickness, distribution parameter, and local nonhomogeneous material property on the stress intensity factor which is obtained by solving a singular integral equation. @ 1997 Elsevier Science Ltd.