ビードフラッシュ法による溶接残留応力の逆問題解析 : 厚さ方向の固有ひずみ分布を考慮した解法の提案

概要

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Nondestructive evaluation of welding residual stresses is required to assess the structural integrity of engineering components. Authors have proposed a new nondestructive evaluation method called "the Bead Flush Method" for welding residual stress evaluation. Up to the present studies, the solution set of eigenstrains in the bead flush method has been determined under the assumption which eigenstrain distributions of the bead and the thickness directions are constant, but in general, except for relatively quite thin plates, this assumption does not come into existent. For wider applicability of the bead flush method, the conventional procedure should be improved. In this study, we propose a new evaluation algorism of welding residual stresses applicable to thicker welded plates. Its main characteristic is to enforce eigenstrain determination process in inverse analysis. To do this, a new eigenstrain function based on welding simulations and the optimization method of its parameters using response surface methodology are proposed. And also its utility is confirmed by simulations of the bead flush method.
社団法人日本機械学会の論文
2002-10-25