A remising algorithm for three-dimension crack growth and intersection with surfaces or cracks in non-coplanar planes

摘要

A recent procedure developed for crack growth in which three-dimensional stress intensity factors are calculated by boundary integral equations is used to compute fatigue creak growth as cracks grow in accordance with Paris' law and also intersect each other or other surfaces. This paper concentrates on describing the remising algorithms needed as the cracks grow and when they intersect each other or other surfaces. The algorithms produced treat crack growth; prior to intersections, after intersection with a free surface, after intersection of a crack edge with a crack surface away from its edge, and after intersection of coplanar cracks. The method is applied here to the growth of an initially circular crack at the center of a block under uniform tensile traction on the faces parallel to the crack. The crack grows to intersect either a free surface of the block or the center of a square crack in an orthogonal plane.