A FINITE-ELEMENT APPROACH FOR J(2) CALCULATION IN ANISOTROPIC MATERIALS

A numerical scheme, based on the concept of domain integral method, is developed for evaluation of J(2) in two-dimensional anisotropic linea r elastic solids. The scheme is designed to be in conjunction with fin ite element solutions. Although the method is verified to be patch-ind ependent, in a modified sense, the near tip region is always included in the calculation due to the nature of J(2). Special attention is add ressed on appropriate modelling of the singular behavior around the cr ack tip area. The numerical examples show that J(2) can be calculated with good accuracy without using;any particular singular elements. The order of singularity of the strain energy density jump along the crac k surfaces in the near tip region is also properly estimated. Copyrigh t (C) 1996 Elsevier Science Ltd.