1 0 0 0 改良型深孔穿孔法の開発と各種溶接継手での検証
- 著者
- 河合 真二 新堂 正俊 山本 憲吾 永井 卓也 中野 利彦 岡野 成威 望月 正人 菅 哲男
- 出版者
- 一般社団法人 溶接学会
- 雑誌
- 溶接学会全国大会講演概要
- 巻号頁・発行日
- vol.2015, pp.204-205, 2015
板厚内部の残留応力を実測する手法として、改良型深孔穿孔法(以下、MIRS法:Modified Internal Residual Stress)を開発した。MIRS法には3タイプあり、算出する応力成分数で使い分ける。MIRS法の3タイプの紹介と円筒継手などでの実測例を紹介する
- 著者
- 釜谷 昌幸 北條 智博 望月 正人
- 出版者
- 一般社団法人 日本機械学会
- 雑誌
- 日本機械学会論文集 (ISSN:21879761)
- 巻号頁・発行日
- vol.80, no.817, pp.SMM0252-SMM0252, 2014 (Released:2014-09-25)
- 参考文献数
- 44
- 被引用文献数
- 2 2
Load carrying capacity of austenitic stainless steel component is increased due to hardening caused by neutron irradiation if no crack is included in the component. On the other hand, if a crack is initiated in the reactor components, the hardening may decrease the load carrying capacity due to reduction in fracture toughness. In this paper, in order to develop a failure assessment procedure of irradiated cracked components, characteristics of change in failure strength of stainless steels due to cold working were investigated. It was experimentally shown that the proof and tensile strengths were increased by the cold working, whereas the fracture toughness was decreased. The fracture strengths of a cylinder with a circumferential surface crack were analyzed using the obtained material properties. Although the cold working altered the failure mode from plastic collapse to the unsteady ductile crack growth, it did not reduce failure strengths even if 50% cold working was applied. The increase in failure strength was caused not only by increase in flow stress but also by reduction in J-integral value, which was brought by the change in stress-strain curve. It was shown that the failure strength of the hardened stainless steel components could be derived by the two-parameter method, in which the change in material properties could be reasonably considered.
