Transient response of an antiplane inclined subsurface crack subjected to dynamic moving loadings

The transient response of a half-space containing a subsurface inclined semi-inlinite crack excited by a dynamic antiplane loading on the surface of the half-space has been investigated to gain insight into the phenomenon of the interaction of stress waves with material defects. The dynamic load is suddenly applied and then it moves at a constant speed along the free surface. The solutions are derived for all load speeds (subsonic and supersonic) and are determined by superposition of a proposed fundamental solution in the Laplace transform domain. The ftmdamental problem to be considered is the exponentially distributed traction in Laplace transform domain applied on crack faces. The method of analysis is based on integral transform techniques and the Wiener-Hopf technique. The exact closed-form transient full-field solutions of stresses and displacement are obtained in compact formulations. These solutions are valid for an infinite length of time and have accounted for the contributions of incident, reflected and diffracted waves. Numerical results of the transient stresses for the interior of the half-space are obtained and the results of the limit case of zero load speed are compared with the corresponding static values. Copyright 0 1996 Elsevier Science Ltd