計装化シャルピー試験法による動的弾塑性破壊靱性値の有効性

概要

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In this paper, the validity of dynamic elastic-plastic fracture toughness J_d value by the developed evaluation system is studied on the steel for reactor pressure vessel. The effectiveness of the new system for the evaluation of the dynamic fracture toughness is also examined and proved on other kinds of materials such as aluminum alloy, Ti alloy, ductile cast iron and various steels. Moreover, the simple formura for the calculation of the specimen compliance (C_s) under dynamic loading condition, which is necessary for the correction of the crack initiation energy when J_d is evaluated, is presented. Elastic-plastic fracture toughness is generally affected by the specimen size. The valid condition for the specimen size under static loading condition is defined in ASTM E813-81. The valid condition for the specimen size determined under dynamic loading condition based on the same procedure appears severer than that of ASTM E813-81. However, it is clarified that the valid dynamic elastic-plastic fracture toughness (J_<Id>) is possible to obtain from small specimen such as the standard Charpy size one with the side grooves.
社団法人日本鉄鋼協会の論文
1988-05-01