低強度鋼および高強度鋼の不安定破壊靱性に及ぼす板厚の影響 : フラクトグラフィ的検討

概要

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The effect of specimen thickness on the unstable fracture generated from fatigue precrack has been investigated. Tests were made on the three point bend specimens and compact tension specimens with 2, 4, 10 and 17mm plate thickness of SS41 mild steel and quenched high strength steel with ranging in temperature from the room temperature to -100℃. The fractographic observation was made to characterize the thickness effect on the unstable fracture of low strength steel and hight strength steel. The results obtained summarized as follow: 1) The J_c-value of SS41 mild steel at which the clevage fracture occured was sensitive to change in plate thickness. However, the effect of specimen geometry was not observed on the J_c-value in this study. 2) For the quenched high strength steel with 130kg/mm^2 ultimate strength at room temperature, the dimple pattern was predominant on the fracture surface in spite of the unstable fracture. Those J_c(=J_i)-values were not influenced by the temperature and plate thickness.
社団法人日本船舶海洋工学会の論文
1983-08-24