抄録
In failure analysis of a fractured component, estimation of residual stress distribution in the component before fracture is required. In this study, we propose a method to estimate the axisymmetric residual stresses in the original cylindrical component from its broken pieces. The method, which we refer to as broken piece method, employs an arc piece specimen and an axial piece specimen cut from the fractured component. The residual stresses are estimated from measured strains of the two pieces based on the equivalent inherent strain concept. The applicability of this method and appropriate dimensions of the piece specimens were theoretically discussed and experimentally verified by measuring residual stresses in a clad pipe. This method also applies to large cylindrical component case, where the residual stress measurement is quite difficult by using traditional measuring method with large cylindrical body specimen.
