Numerical Simulation of Ductile Crack Initiation in Metallic Material Using Interface Element Based on Lennard-Jones Type Potential Function(Mechanics, Strength & Structure Design)

The fracture behavior of a cracked body is characterized by the property of the plastic zone in small scale yielding conditions and process zone in large scale yielding conditions. Based on the Lennard-Jones type potential function, an interface crack model (ICM) was proposed for the analysis of fracture behavior of ductile materials in this report. The local J-integral along the interface elements was defined as a critical parameter for crack initiation. The new crack surface will form when the applied J-integral far from the crack tip equals the critical local J-integral. A center-cracked specimen with a/W=0.5 is numerically analyzed making use of the ICM. The effects of the parameters in the ICM on the relationship of the local J-integral and the far J-integral were numerically investigated.