弾塑性破壊の2パラメータ法と破壊評価線図 : 配管炭素鋼STS42への適用

概要

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In the previous study, the elastic-plastic fracture toughness, J_<IC>, and the elastic-plastic fracture resistance curve (J-R curve) were evaluated by using compact specimens for a carbon steel, STS 42, used for piping in nuclear reactors. Based on those results, the applicability of the two-parameter approach to carbon steel piping was examined in this study. The construction of the failure assessment diagram (FAD) was also attempted. The results obtained are summarized as follows ; (1) In the application of the two-parameter approach, it is essential to adapt the J-integral as a fracture criterion accounting for the strain-hardening effect. (2) Based on the FAD constructed, it is shown that the whole fracture process, from the fracture initiation to the unstable fracture (or the plastic collapse) including the stable crack growth, is predicted precisely for various sizes of specimen. (3) The failure assessment curve (FAC) defined in CEGB Report, R/H/R 6-Rev. 3, option 1 does not give a conservative prediction, and neither does the FAC in appendix 8.
一般社団法人日本機械学会の論文
1987-12-25