バラツキを考慮した限界COD値とVシャルピ破面遷移温度の相関

概要

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In order to correlate the temperature dependence of critical COD, δ_c, with Charpy-V transition temperature, FATT, the statistical analysis was attempted on the available data of notch toughness. About 1300 data on the notch toughness in the base metal and welded joint of mild steel and high strength steel were compiled from published and unpublished literatures. Firstly, the statistical hypothesis that there exists the linear relationship between logarithm ofδ_c and reciprocal of absolute temperature was tested. As a result, the hypothesis was found to be significant. The coefficient of the linearity decreases with increasing strength and doesnot depend on FATT. Secondly, the correlationship between temperature atδ_c=0.16 mm and FATT was examined. Finally, taking into account the uncertainties included in the estimation ofδ_c from FATT, the following equation was established with the aid of maximum likelihood method : [numerical formula] where T_K=T_<sv>-6√B+303 (K), T_<K0.16>=_vT_s+σY0+153 (K), f (z)=1/√<2π>exp (-z^2)(standard normal probability density function), _vT_s : FATT (℃), T_<sv> : service temperature (℃), σY0 : yield stress at room temperature (kg/mm^2), B : thickness of COD test specimen (mm).
社団法人溶接学会の論文
1983-08-05