ON THE SPACE-TIME STRUCTURE OF A WAVE-FIELD IN A DOUBLE-LAYER MEDIUM WITH AN INTERFACE CRACK

Unlike the approaches in [1-31 which treat wave fields over limited ti mes, a technique is developed which enables one, using the principle o f a limiting amplitude, to investigate the propagation and establishme nt of wave fields which are generated in a laminated ideally elastic m edium with plane parallel boundaries of separation by the harmonic osc illations of the edges of a crack from an initial instant of time. The need to take account of all the components of the stress tensor outsi de of the crack in its plane is discussed.