Fatigue life prediction considering conversion of mean stress for titanium alloy under multiaxial thermo-mechanical random loading

被引：3

作者：

Wang, Jin-Jie ^{[1
]}

Shang, De-Guang ^{[1
]}

Li, Wen-Long ^{[1
]}

Li, Wei ^{[1
]}

Qian, Cheng ^{[1
]}

Wu, Shao-Dong ^{[1
]}

机构：

[1] Beijing Univ Technol, Coll Mech & Energy Engn, Beijing 100124, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2024年 / 188卷

基金：

中国国家自然科学基金;

关键词：

Thermo-mechanical fatigue; Multiaxial random loading; Mean stress; Life prediction; Titanium alloy; NICKEL-BASED SUPERALLOY; NI-BASED SUPERALLOY; DAMAGE MECHANISMS; BEHAVIOR; TEMPERATURE; OXIDATION; CREEP;

D O I：

10.1016/j.ijfatigue.2024.108488

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

This paper presents a thermo-mechanical fatigue (TMF) life prediction method for titanium alloy TA15 under multiaxial random amplitude loading. Through strain-controlled TMF tests, it was found that under full-reversed cyclic loading, there was a significant presence of mean stress in the stress response. The induced mean stress led to the anomalous phenomenon where the fatigue life of thermal phase angle out-of-phase (TOP) was shorter than that of thermal phase angle in-phase (TIP). Therefore, a new damage calculation model was proposed, which can take into account the pure fatigue damage considering mean stress conversion and the cumulative environmental damage. Uniaxial TMF tests, constant amplitude multiaxial TMF tests, and random amplitude multiaxial TMF tests are conducted to verify the proposed method. The predicted results for all types of tests are in a good agreement with the experimental data.

引用

页数：13

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