コンパクト試験による構造用鋼材の脆性き裂伝播停止靱性の評価

概要

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Crack arrest tests such as compact, ESSO and DCB tests were made on SA533B Cl. 1, HT80 and KD32 steels to evaluate the crack arrest toughness. The main results obtained are as follows : 1) The crack arrest toughness was evaluated by K_<Ia> which was obtained by the static analysis of compact test. 2) K_<ID> determined by the dynamic analysis of compact test was greater than K_<Ia>, though K_<ID> became close to K_<Ia> as K_<Ia>/K_Q became a unity. K_Q is the stress intensity factor at the crack initiation. 3) No significant difference was observed between K_<Ia> and K_<ca> obtained by ESSO and DCB tests, though K_<ca> obtained by DCB test tended to be smaller than K_<Ia> at lower temperatures. 4) K_<Ia> was smaller than K_<Ic> in the transition temperature range, while it was greater than K_<Id>. In the temperature range where K_<Ic> which was determined from J_<Ic> decreased with temperature increase, however, it was smaller than K_<Ia>. 5) The fracture appearance transition temperature and the absorbed energy obtained by 2mm V notch Charpy test were appropriate parameters for representing the crack arrest toughness, while the NDT temperature was not.
社団法人日本鉄鋼協会の論文
1981-05-01