HT60の大規模降伏脆性破壊靱性値に及ぼす板厚の影響

概要

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In the previous papers, the authors proposed the β-value as the constraint coefficient due to the plate thickness and formulas to evaluate the values of critical CTOD φ_<0c> and J_c under the large scale yielding by using the relation between β and thickness B, respectively. It had been shown that values of φ_<0c> and J_c of mild steel (SS41) for any thickness specimen were able to be estimated by the formulas presented by authors. The object of this investigation is to insure the validity of formulas for another metallic material. The compact tension specimens made of HT60, ranging in thickness from 5 to 37mm, were tested at the room temperature and -75℃, respectively. The values of φ_<0c> and J_c estimated by the formulas are compared with experimental ones. The following conclusions are obstained: (1) The analytical values of β for HT60 are in good agreement with those values for SS41. (2) It is clear that the formulas proposed by authors are valid for the evaluation of large scale brittle fracture toughness of HT60 considering thickness effects.
1984-08-24