Experimental investigation of strain concentration evaluation based on the stress redistribution locus method

応力再配分軌跡法(SRL法)に基づくひずみ集中評価法の検討

磯部 展宏*; 川崎 信史 ; 安藤 勝訓 ; 祐川 正之*

Isobe, Nobuhiro*; Kawasaki, Nobuchika; Ando, Masanori; Sukekawa, Masayuki*

応力再配分軌跡法(SRL法)により構造不連続部のひずみ集中を評価する手法についてその適用性に関して試験により検証した。試験は種々のひずみ集中係数を有する316FR鋼の環状切り欠き試験片により実施し、ひずみ集中部の局所ひずみをストレインペッカーにより計測した。この結果とSRL法による局所ひずみ予測及び高温保持によるクリープ緩和特性の予測を対比しその特徴を論じた。

A rationalized strain concentration evaluation method was discussed experimentally in this study. High temperature fatigue tests of circumferentially notched specimens were conducted accompanying with local strain measurement by a capacitance type strain gage. Measured strain was compared with the prediction by the SRL method and the applicability of the method is discussed. The SRL method improves the accuracy of inelastic strain estimation with keeping conservativeness in comparison with the Neuber's rule which is used in high temperature design codes.