Abstract: A wave-front approximation to the wave emitted when a propagating mode III crack abruptly slows it speed of advance is calculated. Of particular interest is the approximation of the Cagniard-deHoop ...

Abstract: The surface motions excited by acoustic emissions produced by fracture processes at the edge of a buried, penny-shaped crack are investigated. Firstly, wave-front approximations to the emissions ...

Abstract: Acoustic emissions produced by elementary processes of deformation and fracture at a crack edge are investigated on the basis of elastodynamic ray theory. To obtain a two-dimensional canonical ...