改良ディープホールドリリング法による厚板溶接部残留応力測定

抄録

An advanced deep hole drilling (DHD) technique is developed considering three-dimensional elastic–plastic behavior of materials during drilling and trepanning processes. The conventional, incremental and newly–developed DHD techniques and inherent strain method (strain gauge method) are applied, respectively, to measure through–thickness residual stress in thick-section weldment. Meanwhile, an advanced computational welding mechanics with integrated process–mechanics modeling for welding, which was proposed by authors in previous study, is applied to calculate through-thickness residual stress in the thick-section weldment. The calculated weld bead configuration and thermal cycles were compared with those obtained by experiment to validate the advanced computational simulation technique. Compared with conventional and incremental DHD techniques, newly–developed DHD technique showed a comparatively good agreement with those obtained by inherent strain method and calculated with the simulation technique. It is thus concluded that an advanced DHD technique developed considering three-dimensional elastic–plastic behavior of materials is expected to become available in more accurately measuring through–thickness residual stress in thick-section weldment.