理想化陽解法FEM を用いた実機多パス溶接継手の残留応力解析
Residual stress analysis of multi-pass welded joint in nuclear power plant using idealized explicit FEM.
著者:
西川 聡 Satoru NISHIKAWA 生島 一樹 Kazuki IKUSHIMA 柴原 正和 Masakazu SHIBAHARA
発刊日:
公開日:
butt welded pipedissimilar welded jointidealized explicit FEMmulti-pass weldingresidual stressthree dimensions analysis
概要
In welds of steel structure of nuclear power plants, stress corrosion cracking and fatigue cracking occur, and the residual stress due to welding becomes one of the main factors causing them. Therefore, it is necessary to understand the residual stress distribution of a welded region, and residual stress analysis performed by the finite element method (FEM) has been become an effective tool. Previously, in order to shorten computation time, the analyses are carried out in a two-dimensional model and the grouping technique for decreasing of the number of pass sequence. However, welding process is moving a heat source, and the grouping technique has not been fully established. Therefore, it is more appropriate to use a three-dimensional model and to perform an analysis in which multi-pass sequence is considered. In this research, large-scale analyses were performed by an idealized explicit FEM in order to understand residual stress in butt welded pipes welded with pass sequence consisting of more than one hundred passes for a large thickness..
