最弱リンクモデルに基づく溶接部の局部劣化部靱性推定手法(昭和60年度春季全国大会論文発表講演論文)

概要

論文の詳細を見る
Fracture toughness testing of heat-affected zone, especially grain coarsened zone, in welds is considerably difficult compared with weld metal and base metal, because the embrittlement of HAZ causes in the localized region. However, grain coarsened HAZ is usually the most embrittled region in welds, it is often required to evaluate fracture toughness of its region itself. In the present paper, a probabilistic procedure for evaluating fracture toughness of the localized embrittlement region has been proposed newly, based on the weakest link model. By means of this procedure, distribution of cleavage toughness of localized embrittlement region, e.g. grain coarsened HAZ, is proved to be analyzed from test results on specimens of which notch is located in weld metal and base metal, respectively, and cross-bond-type notched specimens which have localized embrittlement region at notch front. Moreover, the sufficient number of cross-bond-type notched specimens which are necessary to evaluate fracture toughness of localized embrittlement region itself according to our present procedure has been investigated. By using 20 or more cross-bond-type notched specimens, cleavage toughness of the localized embrittlement region can be grasped.
社団法人溶接学会の論文
1985-02-05