Numerical simulation of residual stress modification by reverse bending of notched fracture toughness test specimens of multipass welds

摘要

Highlights?Residual stress modification process for fracture toughness testing is modeled.?Mechanisms of residual stress modification by reverse bending are clarified.?Reverse bending is effective in modifying the residual stress distribution.?The plastic deformation introduced by reverse bending is limited to the notch root.AbstractIn the fracture toughness tests of multipass welds of thick steel plates, the fatigue precrack front initiating from a machined notch root frequently be non-uniform affected by the welding residual stress distribution. Reverse bending before fatigue precracking could be an effective measure of residual stress modification. However, the effect of reverse bending is not well understood from the viewpoint of the variation of the residual stress distribution at the notch root. Therefore, the transition of the welding residual stress throughout the multipass welding, notch machining, and re