AN ELASTIC STRIP WITH 3 COPLANAR MOVING GRIFFITH CRACKS

The dynamic anti-plane problem of determining stress and displacement due to three co-planar Griffith cracks moving steadily at a subsonic s peed in an infinite elastic strip has been considered. Employing Fouri er integral transform, the problem when the rigidly clamped edges of t he strip are pulled apart in opposite directions has been reduced to s olving a set of four integral equations. These integral equations have been solved using the finite Hilbert transform technique and Cook's r esult [Glas. Math. J. 11, 9 (1970)] to obtain the exact form of crack opening displacement and stress intensity factors. Numerical results f or stress intensity factors are presented in the form of graphs.