Finite element analysis of residual strength of pipe with hemispheric corrosion defect

The situation of stress and strain was analyzed by Finite Element Analysis (FEA) for the corroded line pipe by deferent inner pressures and with single hemispheric corrosion defects, of which the radius and depth were set as t/8, t/4 and t/2 (t, the pipe wall thickness) respectively. Meanwhile, the residual strength of the pipes with corresponding defects were calculated respectively, as well as the empirical equation that relates to the residual strength and depth-thickness ratio d/t, was established, which shown that the residual strength decreased linearly with the increasing d/t.