Evaluation of Stress Intensity Factor at Mode II condition by J integral

Abstract

Large steel structures are exposed to several types of loads depending on the configuration of the structure or member. In many cases, the axial force primarily affects the strength of structures. On the other hand, the life of a structure can be affected depending on the type of load, for example, shear force or mixed loads. This study examined the Mode II state of the loading condition under fatigues and fractures. Mode I fatigues and fractures have been extensively studied in evaluating the stress intensity factor (SIF), but Mode II failure has seldom been studied. In addition, many types of specimens have been used because a standardized specimen or experimental procedure has not yet been established for Mode II conditions. Therefore, the behavior of the SIF of the Mode II condition was examined using the finite element method (FEM) and J integral with an in-house FEM program. The evaluation used 3905 nodes and 7596 elements of a full model specimen with a crack length of 0.04 m. The results were compared with other results, and an accuracy of more than 97.4 % was achieved with the proposed calculation.