オーステナイトステンレス鋼(SUS316LN)の極低温破壊靭性に及ぼす試験片寸法効果

概要

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This investigation has been carried out to determine the influence of specimen size and side groove on elastic-plastic fracture toughness parameters. Elastic-plastic fracture toughness J_<IC> and tearing modulus T_<mat> were evaluated by the unloading compliance method which describes ASTM E813-81 standards. A compact tension specimen was prepared from SUS316LN and the test was conducted at cryogenic temperature 4.2K. It is understood that J_<IC> and T_<mat> were independent of specimen size when the specimen satisfied ASTM standard size requirements. J_<IC> and T_<mat> decrease with the increase of side groove for 0-12.5%, and they are independent of the side groove when the side groove is 12.5-37.5%. These results suggest that a 0.5 CT small specimen with a 25% side groove can provide a proper J_<IC> and T_<mat> independent of specimen size and side groove.
一般社団法人日本機械学会の論文
1988-09-25