Evaluation of <i>J</i> Integral for Interacting Twin Collinear Through-Wall Cracks in a Plate under Tension

Abstract

The interaction behavior of twin collinear through-wall cracks in tension loaded plate under elastic-plastic condition is investigated by the finite element method (FEM). The fracture parameter J integral for interacting cracks is calculated and compared to the J integral for a single crack the same size. In this way, the interaction factor of cracks under elastic-plastic condition is defined. This interaction factor is compared to the results of analytical solution of the interaction factor under linear elastic condition. The results show that interaction factor of cracks under elastic-plastic condition is higher than interaction factor of same cracks under linear elastic condition. Also the interaction effect of cracks under elastic-plastic condition is influenced not only by the crack configurations but also by the material properties, especially the strain hardening exponent n.

A study on evaluation of stress intensity factor (KI) andJ‐integral for 40Ni2Cr1Mo28 alloy (structural steel): analytical and finite element analysis approach

“…Also, related that the physical significance of the J-integral was the rate of release in energy and exposed the relation between the K I and the J-integral [9]. A vital parameter of fracture, the J-integral is widely used in theory, experiments and numerical studies of the fracture [11][12][13][14][15]. The J-integral describes the stress and the strain of the crack tip in the non-linear materials and shall be regarded as both an energy parameter and stress intensity parameter.…”