Residual Stress Evaluation for Weldment of Structural Components Using Instrumented Indentation Technique

摘要

We suggest a new instrumented indentation technique for estimating residual stress in weldments. This technique is based on the key concepts that the deviatoric stress part of the residual stress changes the indentation load-depth curve, and that through analysis of the difference between the residual stress-induced indentation curve and residual stress-free curve, the quantitative residual stress of the target region can be evaluated. To verify the applicability of the suggested technique, indentation tests and conventional tests were performed on natural gas pipeline weldments. The estimated residual stress values obtained using the indentation technique showed good agreement with those from conventional tests.