Crack behavior, stress intensity factor and ductile crack initiation energy modeling in API X80 pipelines

An API X80 pipeline steel has been investigated with respect to crack propagation and fracture mechanism. A FEM approach has been applied to simulate the onset ofcrack propagation. The API X80 pipeline steel simulation has been investigated. Five standard samples of fracture toughness tests simulation in different loading (520-810(MPa)) were used to study crack propagation, while the simulation results were compared with theoreticalresults. Additionally, in each simulation, plastic zone shape of crack propagation is shown and the results are compared by the theoretical results. Stress diffusionthrough all parts of simulated samples are shown. All results are extracted in 4(°C) temperature. There is a goodagreement between theoretical and simulation results. According to these verifications, presented FEM simulation is reliable to predict crack behavior andcalculating KIC and JIC of an API X80 pipeline steel in other kind of loading or crack propagation

Keywords:

KIC , JIC , Crack Behavior , API X80