2V シャルピ衝撃試験の破面遷移温度と COD 試験による破壊靱性値との相関

概要

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The relationship between the fracture appearance transition temperature _vT_<rs> in the V-notch Charpy test and some fracture toughnesses in the COD test has been investigated. The obtained results can be summarized as follows : -(1) The fracture toughnesses can be calculated from _vT_<rs> by developing the equation, which relates _vT_<rs> to the brittle fracture initiation temperature under the conditions of any crack length and any applied stress. (2) The brittle fracture initiation characteristics under any residual stress can be calculated using the values of residual stress and _vT_<rs>. This method can be applied to estimate the effects of the stress relief heat-treatment on the brittle fracture initiation. (3) When K_c is expressed by the following equation, K_c=K_0exp(-k_0/T) K_0 and k_0 increase with an increase in _vT_<rs> and plate thickness, and with a decrease in the strength of steel plates.
1977-11-05