固有ひずみを用いた弾性計算による溶接変形および残留応力の推定 : (第2報) 多重熱履歴の下での変形と残留応力

概要

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Mechanical phenomena in multi-pass welding can be separated into that of newly welded metal and existing weld. metal under repeated thermal cycle. In this report, the latter is investigated using FEM, simple mechanical model and experiment. The mechanism of inherent strain formation under repeated .thermal cycle is clarified using constraint and heat input as governing parameters. The inherent strain is the non-elastic part of the strain which is considered to be the cause of both welding deformation and residual stress. Thus, the welding deformation and residual stress can be computed by elastic FEM if the inherent strain is known. The procedure to estimate the inherent strain for the multiple thermal cycle is proposed and its usefulness is demonstrated through a numerical example.
社団法人日本船舶海洋工学会の論文