垂直透過および斜角反射法を併用した超音波法による鋼張力鋼のJ_<ic>測定と評価

概要

論文の詳細を見る
An ultrasonic method for measuring J_<Ic> has been studied by using compact type specimens of three kinds of high strength steels. The onset of crack extension was found to be accurately detectable by both ultrasonic through transmission and angle beem reflection methods. The latter method was useful to reveal the microscopic change of configuration of precrack tip. In an HT80 steel, the J_<Ic> value obtained by the ultrasonic method agreed with that obtained by the R-curve method. However, in A533B and SM50 steels the J_<Ic> values obtained by the ultrasonic method were larger than those obtained by the R-curve method. This disagreement of J_<Ic> value was attributed to the formation of void or secondary crack before the onset of crack extension.
社団法人日本材料学会の論文
1984-10-15