Abstract
ABSTRACT In this study, a typical gas pipeline exposed to environmental conditions is modeled through the finite element method to investigate the fracture response of the cracked pipeline and compare various mechanical clamps crack arresting efficiency. Comparing numerical simulation results with those available analytical data reveals a good agreement. The results show that tight-fit sleeves practically arrest longitudinal cracks and stop their growth entirely, as SIF values for cracks with the inclination angle of more than 30° are entirely negative. Furthermore, it is understood that cracks with inclination angles of up to about 30° are critical to arrest. It is found that friction between the clamp and the outer surface of pipeline and also clamps’ contact length may not consider as important options for increasing the clamp efficiency, while they have insignificant effect on arresting longitudinal cracks with the inclination angle of more than 30°.
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