Fatigue tests and a damage mechanics-based fatigue model on a cast Al-Si-Mg aluminum alloy with scratches

被引：9

作者：

Yang, Susong ^{[1
]}

Hu, Weiping ^{[1
,4
]}

Zhan, Zhixin ^{[1
]}

Li, Jian ^{[2
]}

Bai, Chunyu ^{[3
]}

Yang, Qiang ^{[3
]}

Meng, Qingchun ^{[1
]}

机构：

[1] Beihang Univ, Sch Aeronaut Sci & Engn, Beijing 100191, Peoples R China

[2] Aero Engine Grp Corp China, Hunan Aviat Powerplant Res Inst, Zhuzhou 412002, Peoples R China

[3] Aircraft Strength Res Inst China, Aviat Key Lab Sci & Technol Struct Impact Dynam, Xian 710065, Peoples R China

[4] Beihang Univ, Room D604,New Main Bldg, 37th Xueyuan Rd, Beijing 100191, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2022年 / 165卷

基金：

中国国家自然科学基金;

关键词：

Continuum damage mechanics; Aluminum alloy; Scratch; Damage evolution model; Fatigue life; SPEED RAILWAY AXLES; LIFE PREDICTION; FRETTING FATIGUE; CRACK GROWTH; TOLERANCE; DEFECTS; BEHAVIOR; STRESS;

D O I：

10.1016/j.ijfatigue.2022.107198

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Scratches can significantly influence the fatigue performance of materials or structures even with several hun-dred microns depth. In this study, the effect of scratch defects on the fatigue performance of ZL114A cast aluminum alloy is systematically studied. Fatigue tests of scratched smooth specimens and scratched hole plates are conducted. For scratches with the depths of 0.15, 0.25 and 0.35 mm, the mean fatigue life is reduced by about 35 %, 50 % and 61 % compared to unscratched specimens. A novel fatigue damage model based on continuum damage mechanics (CDM) is then developed. This model can well evaluate the fatigue performance of actual components with scratches and is convenient to use by avoiding modeling the real tiny scratch. The comparison between the predicted results and experimental data shows a good accuracy.

引用

页数：15

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