高強度鋼における延性き裂の進展とその後の脆性破壊限界条件に関する検討

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タイトル別名
  • Critical Condition of Ductile Crack Extension and Its Critical Condition of Subsequent Brittle Fracture for High Strength Steel
  • コウキョウド コウ ニ オケル エンセイ キレツ ノ シンテン ト ソノゴ ノ ゼイセイ ハカイ ゲンカイ ジョウケン ニ カンスル ケントウ

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抄録

Fracture behavior showing ductile-to-brittle transition in steel is quite important for the assessment of structures against catastrophic failure. Recently various fracture assessment methods have been established. In such methods, all toughness data of target steel including ductile-to-brittle behavior must be collected before evaluation. Also consideration about ductile crack is not sufficient. This report picks up high strength steel and designs to clarify ductile-to-brittle behavior from standpoint of mechanics in two stages: i,e, 1)ductile crack initiation and extension 2)subsequent brittle fracture . Consequently it became clear that both of two stages could be evaluated by criteria obtained from simple small testing. This can indicate suggestions for more detailed fracture assessment in various structures and more rational material designing.

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