Armin Sabetghadam-Isfahani - Department of Mechanical Engineering, Petroleum University of Technology, Ahwaz, ۶۳۱۴۶-۶۱۱۱۸, Iran
Ali Najarchi - Department of Mechanical Engineering, Petroleum University of Technology, Ahwaz, ۶۳۱۴۶-۶۱۱۱۸, Iran
Gholamreza Rashed - Department of Mechanical Engineering, Petroleum University of Technology, Ahwaz, ۶۳۱۴۶-۶۱۱۱۸, Iran

An API X70 pipeline steel has been investigated with respect to crack propagation and fracture mechanism. A FEM approach has been applied to simulate the onset of crack propagation. The API X70 pipeline steel have been simulated. Herein, for an API X70 pipeline steel, SENT standard sample in different loads (520-810(MPa)) is simulated and then the results are verified by the experimental results. Additionally, in each simulation plastic zone shape of crack propagation is shown and the results are compared with the theoretical results. Stress diffusion through all parts of simulated samples is shown. All results are extracted in 4(°C) temperature. There is a good agreement between experimental, theoretical and numerical results. According to these verifications, presented FEM simulation is reliable to predict crack behavior and calculating KIC and JIC of an API X70 pipeline steel in other kind of loading or crack propagation.

KIC, JIC, Crack Behavior, API X70