Effects of stress ratio on crack growth rate and fatigue strength for high cycle and very-high-cycle fatigue of metallic materials

被引：39
作者：
Sun, Chengqi [1 ]
Lei, Zhengqiang [1 ]
Hong, Youshi [1 ]
机构：
[1] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
来源：
MECHANICS OF MATERIALS | 2014年 / 69卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Stress ratio; Crack growth rate; Fatigue strength; Very-high-cycle fatigue; Metallic materials; DRIVING-FORCE PARAMETER; LOAD RATIO; PROPAGATION BEHAVIOR; STEELS; LIFE; PREDICTION; MECHANISMS; THRESHOLD; FAILURE; CLOSURE;
D O I：
10.1016/j.mechmat.2013.10.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper studies the effects of stress ratio R on crack growth rate and fatigue strength for high cycle and very-high-cycle fatigue of metallic materials. First, the effect of R on fatigue crack growth rate is analyzed, and the result shows that the effect of R on crack growth rate at near-threshold region and on Paris region is well expressed by a unified relation. Then, a model is developed for describing the fatigue crack growth rate with the effect of R in near-threshold region and Paris region. The model is verified by experimental data of metallic materials in literature. Finally, a formula is derived for the effect of R on fatigue strength. The estimated results are in good agreement with the experimental data for high cycle and very-high-cycle fatigue regime in literature. The comparison of the present result with Goodman diagram is also discussed. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：227 / 236
页数：10
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