Brittle Fracture Controlling Parameter of Structural Steels after Large Crack Growth by Cyclic Loading

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  • 繰返し負荷による延性き裂進展後の脆性破壊限界指標
  • クリカエシ フカ ニ ヨル エンセイ キレツ シンテン ゴ ノ ゼイセイ ハカイ ゲンカイ シヒョウ ダイヘンケイ クリカエシ フカ オ ウケル コウ コウゾウ ブザイ ノ ゼイセイ ハカイ ゲンカイ ヒョウカ ニ カンスル ケンキュウ 2 ガン トウロン
  • 繰返し負荷による延性き裂進展後の脆性破壊限界指標 : 大変形繰返し負荷を受ける鋼構造部材の脆性破壊限界評価に関する研究 (第2報)
  • Brittle Fracture Evaluation of Steel Components Subjected to Large Scale Cyclic Loading (Part 2)
  • 大変形繰返し負荷を受ける鋼構造部材の脆性破壊限界評価に関する研究 (第2報)

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Abstract

Brittle fracture properties after crack extension for structural steels under large scale cyclic loading is discussed. Fracture tests are conducted with a shallow-notched 4-point bend specimen for two structural steels, which are largely differ in work hardening properties. Loading history applied are monotonic, repetitive and incremental cyclic loading. Test results are evaluated with a 90% skeleton CTOD, δ90% skeleton, which was defined in Part I of this study. It is shown that the 90% skeleton CTOD, is applicable to evaluate the ductile crack growth resistance curve, irrespective of loading history and work hardening properties. However, a further investigation is necessary to use the 90% skeleton CTOD as a brittle fracture controlling parameter preceded by crack growth in cyclic loading. A discussion should be focused on the effect of cyclic prestrain near the crack-tip on the embrittlement of notched components.

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