高速負荷平面ひずみ破壊じん性K_<IC>(t)の諸特性に関する研究 : 第2報,板厚条件,破壊時間条件の検討

概要

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Rapid-load plane-strain fracture toughness was evaluated on type A508 class 3 steel using a high loading rate tensile machine. Tests were performed according to ASTM E399-83 ANNEX 7 in order to examine the effects of specimen thickness on initiation toughness K_Q and to clarify the significance of the fracture time limitation. The results of this study show that the variation in measured K_Q values could be reduced by increasing the specimen thickness and the present size requirements of B ≥2,5(K_Q/σ_<yD>)^2 are marginally sufficient to obtain valid plane-strain fracture toughness K_<IC>(t) values, and that the fracture time limitation of ANNEX 7 is not substantial requirement but dependent largely on the accuracy of instrumentation of the testing system.
社団法人日本機械学会の論文
1987-01-25