A Predictive Method for the Transverse Residual Stress Distribution at a Thick EH40 Weldment

摘要

This study has been tried to establish the predictive equations for the level of transverse restraint stress and the distribution of transverse residual stress of a thick FC A weldment for the erection stage of a large container carrier using FEA and experiment. In order to do it, the restraint degree of a thick weldment of a large container carrier was evaluated using FEA. The validation of FE analysis procedure used for this study was verified by experiment using an H-slit type specimen for various restraint degrees. In experiment, the restraint stress and residual stress of test specimen were measured using uniaxial strain gages and XRD equipment, respectively. The effects of restraint degree, welding heat input, yield strength of the weldments and welding deposit sequence in a weld groove on the restraint stress and the residual stress were evaluated using FEA. Based on the FEA results, the predictive equations for the level of transverse restraint stress and the distribution of transverse residual stress at a thick weldment were established by dimensional analysis and multiple regression method.