1030 小口径配管残留応力改善工法の解析的検討(OS10-8 供用エネルギー機器の経年変化と健全性評価-残留応力-)

概要

論文の詳細を見る
Reducing the residual tensile stress near the area of a pipe that is affected by weld heat inhibits both of occurence and growth of SCC in stainless steel. We propose a way of reducing tensile residual stresses on the inner surface of small-bore stainless steel pipe welds used in nuclear plants, the delta-T stress improvement method, in which the wall of a pipe is heated by an external heating device and the inner surface of the pipe is rapidly cooled with water. We analytically and experimentally surveyed the mechanisms of using this method to reduce residual stress. In both analytical and experimental results, tensile residual stresses on the inner surface of the small-bore stainless steel pipe with a nominal outside diameter of 60.5 mm were reduced. Furthermore, the analytical and experimental results correspond well, and thus provide good confirmation that this method can be used to reduce tensile residual stress.
一般社団法人日本機械学会の論文
2010-10-09