Partial Release and Relocking of a Frictionally Locked Crack Due to Moving Tensile Loads

Abstract

A finite length 2D crack is closed by remote compression followed by remote shear, and is sufficiently rough so that it remains locked with zero initial tangential crack-face shift. Then a pair of equal and opposite concentrated line loads acting in tension across the crack plane pass over the crack, causing partial opening and shift and then reclosure with residual (locked-in) shift and associated shear Stress Intensity Factors (SIF). Analytical and numerical solutions of the governing singular integral equations are used in studies of the mixed-mode transient and residual states for various coefficients of friction.