Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy

被引：18

作者：

Yang, Kun ^{[1
,2
]}

Zhong, Bin ^{[3
]}

Huang, Qi ^{[4
]}

He, Chao ^{[1
,5
]}

Huang, Zhi-Yong ^{[6
]}

Wang, Qingyuan ^{[1
,2
,5
]}

Liu, Yong-Jie ^{[1
,2
]}

机构：

[1] Sichuan Univ, Coll Architecture & Environm, Failure Mech & Engn Disaster Prevent & Mitigat Ke, Chengdu 610065, Sichuan, Peoples R China

[2] Sichuan Univ, Key Lab Deep Underground Sci & Engn, Minist Educ, Chengdu 610225, Sichuan, Peoples R China

[3] Aviat Ind China, Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China

[4] Sichuan Coll Architectural Technol, Dept Civil Engn, Deyang 618000, Peoples R China

[5] Chengdu Univ, Sch Architecture & Civil Engn, Chengdu 610106, Sichuan, Peoples R China

[6] Sichuan Univ, Sch Aeronaut & Astronaut, Chengdu 610064, Sichuan, Peoples R China

来源：

MATERIALS | 2018年 / 11卷 / 09期

基金：

中国国家自然科学基金;

关键词：

VHCF; multi-point surface crack initiation; notch; mean stress; fatigue strength prediction; CRACK-INITIATION; GIGACYCLE FATIGUE; TI-6AL-4V ALLOY; LIFE PREDICTION; MEAN STRESS; BEHAVIOR; STEEL; REGIME; MECHANISMS; STRENGTH;

D O I：

10.3390/ma11091778

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 up to 10(10) cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio (R) of -1 with smooth specimens and at R = -1, 0.1 and 0.5 with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused by multi-point surface crack initiation changes from crack propagation stage to crack initiation stage in the high cycle fatigue regime. Notch effect further promotes the degeneration of high cycle and very high cycle fatigue strength at R > -1. The bilinear model, extended from the Goodman method, can better estimate the mean stress sensitivity of this titanium alloy. The fatigue mean stress sensitivity and fatigue-creep mean stress sensitivity of this material increased with the increase of fatigue life. The new model, based on the Murakami model, can provide more appropriate predictions for notch fatigue strength.

引用

页数：15

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