Fatigue stress concentration sensitivity and stress ratio effect of a 40CrNi2Si2MoVA steel

被引：16

作者：

Gao, Yukui ^{[1
]}

机构：

[1] Tongji Univ, Sch Aerosp Engn & Appl Mech, 100 Zhangwu Rd, Shanghai 200092, Peoples R China

来源：

MATERIALS LETTERS | 2017年 / 186卷

基金：

中国国家自然科学基金;

关键词：

Fatigue; Notch; Stress concentration; Stress ratio; High-strength steel; STRENGTH;

D O I：

10.1016/j.matlet.2016.09.115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The axial fatigue tests at room temperature for smooth specimens with theoretical stress concentration factor, K-t=1 and notched specimens K-t=2, 3 and 5 were performed in a high-strength 40CrNi2Si2MoVA steel for different stress ratio, R, that is the ratio of minimum stress to maximum stress, of -1, 0.06 and 0.5, respectively. Fatigue strength/limit for 1x10(7) cycles were determined according to a stair-case method. The stress concentration sensitivity and mean stress sensitivity are characterized by q factor and M factor, respectively. Moreover, a new model for evaluate the mean stress effects of high-strength steels was proposed, which is different from Goodman relation and Gerber parabola.

引用

页码：235 / 238

页数：4

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