Abstract: In the dynamic fracture field, the problem with scattered stress wave is very difficultto analyze. At present only a few analytical results have been obtained. Stephen A Than andTsin-Hwei Lu (1970, 1971) treat the transient problem of diffraction of an a plane transient SHwave and an arbitrary plane dilitational wave by a finite crack in an infinite elastic solid. Theyemploy the generalized Wiener-Hopf technique and the standard iteration method. Freund (1990)treat the analogous crack subjected to I load by...