溶接材の低サイクル曲げ疲労実験
1968 年 37 巻 12 号 p. 1327-1334
詳細
1968 年 37 巻 12 号 p. 1327-1334
This paper reports the result of low cycle fatigue test. The laod of this test was given by pure bending shown in Fig. 4, and the amplitude of moment was constant. The specimens consist of two kinds. One is butt-welded in centre part of the plate as shown in Fig. 2, and the other is base metal. Variations of steel classfication are four: SM41, SM50, SM50Y, and SM53.
The results of this test are summarized in Table 3. It was ascertained by this test that fatigue life in low cycle fatigue range is influenced by tensile strength more than by yield stress of coupon test, and that fatigue strength of welded specimens is as high as that of base metal if welding is good.
The trait of crack propagation was distinguished in two types.
(a) propagation in weld metal zone
(b) propagation in heat-affected zone
It was observed in this test that (b) type was more preralent than (a) type.
