Shift of S-N Curves with Stress Ratio

被引:2
|
作者
A. Ohta
N. Suzuki
Y. Maeda
机构
[1] National Institute for Materials Science,
关键词
Fatigue; Fatigue Strength; Fatigue Test; Austenitic Stainless Steel; Stress Ratio;
D O I
10.1007/BF03266374
中图分类号
学科分类号
摘要
The fatigue strength of transverse butt-welded joints of SB410, SPV490 steels and SUS304-HP stainless steel was evaluated experimentally at R = −1, 0 and 0.5 and byσmax = σy tests. The yield strengths for the SB410, SPV490 and SUS304-HP were 284, 579 and 275 MPa. The fatigue strength was found to decrease at the higher R values, even up to around 0.8 in the case of the SPV490. In the case of SB410, the maximum stress at R = 0.5 usually exceeded the yield strength, and some of the fatigue strengths were lower than those obtained from the σmax = σy tests. The fatigue limit was slightly higher compared with that from the σmax = σy tests. In the case of the SUS304-HP joints, the maximum applied stress at R = 0.5 was higher than the yield strength even at the fatigue limit. Therefore, some of the fatigue strengths at R = 0.5 were lower than those from the σmax = σy tests. An empirical formula for the fatigue limit as a function of R, which should be applicable to stress-relieved welded structures, was derived.
引用
收藏
页码:19 / 24
页数:5
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