応力改善工法で付与した圧縮残留応力の持続性評価-ショットピーニングを施した溶接継手の熱サイクル及び応力負荷による残留応力変化（第2報）
Evaluation of the sustainability of compressive residual stress by introduced a stress improvement method (the second report) ?Residual stress change of welded joint with shot peening by thermal cycle and stress loading.
著者:
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 ハルヨ ステファヌス Stefanus HARJO 柴原 正和 Masakazu SHIBAHARA 生島 一樹 Kazuki IKUSHIMA 木谷 悠二 Yuji KITANI 山田 祐介 Yusuke YAMADA
発刊日:
公開日:
butt welded pipecompressive residual stressrelaxationshot peeningstress loadingthermal treatment
概要
To validate the FEM simulation technique presented in the previous report, we made pipe butt welded joints between base metals of the same material SUS316L and between base metals of the dissimilar materials SUS316L and STPT370. Shot peening (SP) on the outer surface or the inner surface of these welded joints induces high compressive residual stresses on the surface. After heat treatment with the peak temperature of 623 K was applied to the welded joints, they retained high compressive residual stresses but the compressive residual stresses were relaxed by 100-300 MPa. Similarly, applying an axial compressive strain of 0.3% to the welded joints enabled them to retain high compressive residual stresses but the compressive residual stresses were relaxed by up to 100 MPa.
