Crack Initiation Mechanism and Life Prediction of Ti60 Titanium Alloy Considering Stress Ratios Effect in Very High Cycle Fatigue Regime

被引：10
作者：
He, Ruixiang [1 ,2 ]
Peng, Haotian [1 ,2 ]
Liu, Fulin [1 ,2 ]
Khan, Muhammad Kashif [3 ]
Chen, Yao [1 ,2 ]
He, Chao [1 ,2 ]
Wang, Chong [1 ,2 ]
Wang, Qingyuan [1 ,2 ]
Liu, Yongjie [1 ,2 ]
机构：
[1] Sichuan Univ, Failure Mech & Engn Disaster Prevent Key Lab Sich, Chengdu 610207, Peoples R China
[2] Sichuan Univ, Coll Architecture & Environm, MOE Key Lab Deep Earth Sci & Engn, Chengdu 610065, Peoples R China
[3] Coventry Univ, Inst Future Transport & Cities, Coventry CV1 5FB, W Midlands, England
来源：
MATERIALS | 2022年 / 15卷 / 08期
关键词：
very high cycle fatigue; Ti60 titanium alloy; fatigue failure mechanism; fatigue life prediction; fatigue strength prediction; stress ratio; CHROMIUM-BEARING STEEL; DEFORMATION-BEHAVIOR; FAILURE-MECHANISM; PROPAGATION; VARIABILITY; MICROSTRUCTURE; NUCLEATION; PROPERTY; JOINT;
D O I：
10.3390/ma15082800
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Ultrasonic fatigue tests were performed on Ti60 titanium alloy up to a very high cycle fatigue (VHCF) regime at various stress ratios to investigate the characteristics. The S-N curves showed continuous declining trends with fatigue limits of 400, 144 and 130 MPa at 10(9) cycles corresponding to stress ratios of R = -1, 0.1 and 0.3, respectively. Fatigue cracks found to be initiated from the subsurface of the specimens in the VHCF regime, especially at high stress ratios. Two modified fatigue life prediction models based on fatigue crack initiation mechanisms for Ti60 titanium alloy in the VHCF regime were developed which showed good agreement with the experimental data.
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页数：15
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