Reliability Analysis of Clamp Welding Defects Based on Finite Element Simulation

Cracking and failure of clamp is a common problem in the maintenance of power grid, which seriously threatens the safety of power grid electrical transmission. Therefore, based on the finite element analysis method, the static strength check and reliability analysis are firstly carried out to evaluate the structural safety of the defect-free clamp. Secondly, SINTAP was used to evaluate clamps with planar defects, and Paris formula was used to predict the fatigue crack growth life. The results show that the clamp with planar welding defects can also meet the requirements under severe working conditions due to its good plastic reserve and toughness. The crack depth a of the welding defect significantly affects the safety of the clamp structure, and the crack feature a/c also has a certain impact on the safety. However, when the crack depth a is less than a certain value, no fatigue fracture will occur.