プラズマディスラプション模擬損傷材の残存疲労寿命に及ぼす繰返し熱負荷の影響

概要

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Surface damage of type 304 stainless steel, which is one of the candidates for the first-wall structural material in a fusion reactor, at cyclic plasma disruption loadings is simulated by a high heat flux Neutron Beam Injection. Influences of the cyclic thermal loads on the residual fatigue life are studied. The results obtained are summarized as follows. (1) The maximum tensile residual stresses near the damaged surface increased with increasing thermal loading cycles from 1 to 5. (2)The fatigue strength and the fatigue limit of the specimen subjected to 5 cycles of thermal loading and those for 1 cycle are the same. (3) A critical crack length, 2b_e to vanish from sight caused by thermal loading is important for the evaluation of the residual fatigue life. If the defect length, 2b < 2b_e, residual life after the second thermal loading and that before thermal loading are the same. If 2b > 2b_e, fatigue crack growth occurs due to the cyclic thermal load.
社団法人日本機械学会の論文
1995-03-25