Study of behaver to relieve residual stress at the time of the shot peening
木谷 悠二 Yuji KITANI 柴原 正和 Masakazu SHIBAHARA 生島 一樹 Kazuki IKUSHIMA 山田 祐介 Yusuke YAMADA 西川 聡 Satoru NISHIKAWA 古川 敬 Takashi FURUKAWA 秋田 貢一 Koichi AKITA 鈴木 裕士 Hiroshi SUZUKI 諸岡 聡 Satoshi MOROOKA
FEM multilayered welding non-linear analysis Residual stress Shot peening
In nuclear power plants, surface treatment including the shot peening is carried out after welding for the prevention of stress corrosion cracking. In this research, the authors developed evaluation systems of the persistence of compressive residual stresses due to shot peening based on the Idealized Explicit FEM which can conduct large-scale non-linear structure analyses in realistic computing time. The developed evaluation system was applied to the analysis of the compressive residual stress due to shot peening in the multipass welded pipe joint. The predicted residual stress distribution after shot peening was compared with the experimental measurement by the X-lay diffraction(XRD). As a result, It was found that the measured result by XRD agree well with the predicted residual stresses. In addition, assuming a large axial compression load due to earthquake, the elastic-plastic analysis was carried out to investigate the influence of the axial load on the compressive residual stress introduced by shot peening. From these investigation, it was shown that the persistence of the compressive residual stress introduced by shot peening can be evaluated using the proposed analysis system.