Multi-Crack Dynamic Interaction Effect on Oil and Gas Pipeline Weld Joints Based on VCCT

In pipelines for transporting oil and gas, multiple cracks often exist in weld joints. The interaction among the should be considered as it directly affects life span of pipeline structures. current investigation, based on fluid–solid magnetic coupling model, virtual crack-closure technique (VCCT) is applied to systematically study multi-crack dynamic effect welds during crack propagation process. results show that existence an auxiliary accelerates main crack’s propagation. When nearer tip, enhancement increases. Further, when initial length increases, becomes easier propagate. Two important parameters, distance between two interacting tips size crack, are studied detail. Their interference has been quantified, which very user-friendly engineers conduct failure assessment prevention gas pipes with at