Full Text:   <3650>

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CLC number: O346.2

On-line Access: 2015-11-04

Received: 2014-10-22

Revision Accepted: 2015-03-01

Crosschecked: 2015-10-16

Cited: 2

Clicked: 4002

Citations:  Bibtex RefMan EndNote GB/T7714


Shan-qin Hou


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Journal of Zhejiang University SCIENCE A 2015 Vol.16 No.11 P.885-893


Relationship among S-N curves corresponding to different mean stresses or stress ratios

Author(s):  Shan-qin Hou, Jin-quan Xu

Affiliation(s):  1School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; more

Corresponding email(s):   jqxu@sjtu.edu.cn

Key Words:  Damage mechanics, S-N curve, Evolution law, Equivalent method, Fatigue limit

Shan-qin Hou, Jin-quan Xu. Relationship among S-N curves corresponding to different mean stresses or stress ratios[J]. Journal of Zhejiang University Science A, 2015, 16(11): 885-893.

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author="Shan-qin Hou, Jin-quan Xu",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Relationship among S-N curves corresponding to different mean stresses or stress ratios
%A Shan-qin Hou
%A Jin-quan Xu
%J Journal of Zhejiang University SCIENCE A
%V 16
%N 11
%P 885-893
%@ 1673-565X
%D 2015
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1400321

T1 - Relationship among S-N curves corresponding to different mean stresses or stress ratios
A1 - Shan-qin Hou
A1 - Jin-quan Xu
J0 - Journal of Zhejiang University Science A
VL - 16
IS - 11
SP - 885
EP - 893
%@ 1673-565X
Y1 - 2015
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1400321

It is well known that the mean stress or stress ratio of fatigue loadings has a strong effect on the shape of s-N curves. An understanding of the relationships among s-N curves corresponding to different mean stresses or stress ratios would be very useful in engineering applications. In this study, based on continuum damage mechanics, a mathematical expression of an s-N curve is deduced from a new damage evolution law. This mathematical expression can well represent the whole s-N curve, not only the linear part in bi-logarithmic diagrams, but also the transitional part near the fatigue limit. The effect of mean stress on an s-N curve is represented by two state parameters. The relationships between these state parameters and the mean stress are proposed and examined. By using these relationships, the concepts of equivalent symmetric amplitude and equivalent symmetric cycles are introduced. We have found that all s-N curves under non-symmetric states can be rearranged into the same curve as that of symmetric fatigue by adopting these equivalent parameters.


方法:1. 基于Kachanov的疲劳损伤演化律,考虑循环载荷作用下高周疲劳的实际情况,提出疲劳损伤演化模型;2. 采用高镇同(1981)的实验数据,验证不同平均应力下S-N曲线的数学表达式; 3. 利用等效对称应力幅和等效对称寿命的概念,研究不同平均应力下的S-N曲线数学表达式。
结论:1. 提出任意循环比或平均应力下S-N曲线的统一数学表达式;2. 给出疲劳极限、比例系数和平均应力间的关系;3. 引入等效对称循环应力和寿命的概念,可以将任意循环比或平均应力下的疲劳等效为对称疲劳。


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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