Finite Element Analysis of Minimum PlasticZone Radius criterion for crack initiationdirection under mixed mode loading

摘要

The studies on crack-tip plastic zones are of fundamental importance in describing theprocess of failure and in formulating various fracture criteria. The material fracture by opening mode(mode I) is not solely responsible for fracture propagation. Many industrial examples show the presenceof mode II and mixed mode I + II loading in machine/structural components. In the present study, theemphasis is placed on the analysis of the size and shape of the plastic zone at the crack tip under mixedmode (I + II) loading conditions. The shape and size of crack-tip plastic zones have been estimated byelastic finite element analysis in a Compact Tensile Shear (CTS) specimen under mixed mode loadingaccording to von Mises yield criteria. The results obtained are used to analyze the minimum plastic zoneradius (MPZR) criterion for crack-initiation angle with reference to the loading angle and stressintensity factor.