Influence Yield Stress on Arrest Pressure in Pipe Predicted by CTOA

AbstractIn this paper, the resistance to ductile crack extension is discussed in terms CTOA. Selection of CTOA is based on the reduced number of parameters and the low sensitivity to pipe geometry. Numerical simulations of crack propagation and arrest based on CTOA use the node release technique, which is described. Results on a pipe made in steel API L ,X52, X65 and X 100 are presented. The influence material parameters on crack arrest and velocity using this technique are presented. For the same decompression wave pressure, the crack propagation velocity is inversely proportional to the resistance to crack extension of the material, which is the dominant parameter. The crack velocity versus decompression is expressed by a CTOAc function of resistance to crack extensio