In this paper, applicability of net-section collapse load approach to circumferential multiple-cracked pipe assessment is investigated using finite element (FE) damage analysis. The FE damage analysis based on the stress-modified fracture strain model is validated against limited fracture test data of two circumferential surface-cracked pipes. Then, the systematic parametric study is performed using the FE damage analysis for symmetrical and asymmetrical surface-cracked pipes. It is found that predictions using the net-section collapse load approach tend to be more accurate with increasing the distance between two symmetrical cracks. For asymmetrical cracks, it is found that the deeper crack plays a more important role and that the existing net-section collapse load expression can be potentially nonconservative. Idealization to symmetrical cracks based on the deeper crack is proposed.

Issue Section:
Design and Analysis
Keywords:
Fatigue, Finite element, Safety, Fracture prediction, Boundary element methods, Reliability
Topics:
Collapse, Damage, Fracture (Materials), Pipes, Stress, Surface cracks, Symmetry (Physics), Simulation, Finite element analysis, Fracture (Process)

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