Very high cycle fatigue behaviors of a turbine engine blade alloy at various stress ratios

被引：106

作者：

Yang, Kun ^{[1
]}

He, Chao ^{[1
,2
]}

Huang, Qi ^{[3
]}

Huang, Zhi Yong ^{[4
]}

Wang, Cong ^{[4
]}

Wang, Qingyuan ^{[1
,2
]}

Liu, Yong Jie ^{[1
]}

Zhong, Bin ^{[5
]}

机构：

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

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

[3] Sichuan Coll Architecture Technol, Dept Civil Engn, Deyang 618000, Peoples R China

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

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

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2017年 / 99卷

关键词：

Titanium alloy; Very high cycle fatigue; Stress ratio; Fatigue failure process; Fatigue strength; SUBSURFACE CRACK INITIATION; CHROMIUM-BEARING STEEL; LONG-LIFE FATIGUE; GIGACYCLE FATIGUE; TI-6AL-4V ALLOY; TITANIUM-ALLOY; LOAD RATIO; PROPAGATION; THRESHOLD; GROWTH;

D O I：

10.1016/j.ijfatigue.2016.11.032

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Ultrasonic fatigue tests were carried out to investigate the effect of stress ratio on the very high cycle fatigue (VHCF) behaviors of titanium alloy (Ti-8Al-1Mo-1V). The fatigue strength at stress ratios of 0.1 and 0.5 were lower than the safely modified Goodman approximation, and a significant deviation was observed in the VHCF regime. Based on fractography and fracture mechanics, the fatigue failure process was congruously divided into four stages: (1) crack initiation induced by cleavage of primary a grains and its coalescence; (2) microstructure-sensitive slow crack propagation; (3) microstructure-insensitive fast crack propagation; and (4) final fatigue failure. Meanwhile, for surface crack initiation, fatigue crack propagation life only occupied less than 3% of total life in the VHCF regime, and over 95% of the fatigue crack propagation life was expended in the microstructure-sensitive crack propagation stage. The effect of stress ratio on crack propagation life was not distinct. (C) 2016 Published by Elsevier Ltd.

引用

页码：35 / 43

页数：9

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