Fatigue properties of age-hardened Al alloy 2017-T4 under ultrasonic loading

被引：0

作者：

Yan, Nu ^{[1
]}

Wang, Qingyuan ^{[2
]}

Wang, Xishu ^{[3
]}

Chen, Q. ^{[4
]}

Kawagoishi, N. ^{[5
]}

机构：

[1] China Three Gorges Univ, Hubei Key Lab Hydroelect Machinery Design & Maint, Yichang 434002, Peoples R China

[2] Sichuan Univ, Dept Civil Engn, Chengdu 610064, Sichuan, Peoples R China

[3] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China

[4] Kumamoto Univ, Ctr Globalizat, Kumamoto 8608555, Japan

[5] Kagoshima Univ, Dept Mech Engn, Kagoshima 8900065, Japan

来源：

THEORETICAL AND APPLIED MECHANICS LETTERS | 2012年 / 2卷 / 03期

基金：

中国国家自然科学基金; 湖北省教育厅重点项目;

关键词：

fatigue properties; fracture mechanism; ultrasonic loading; age-hardened Al alloy; environmental effect;

D O I：

10.1063/2.1203108

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Fatigue properties of age-hardened Al alloy 2017-T4 under ultrasonic loading frequency (20 kHz) were investigated and compared with the results under conventional loading of rotating bending (50 Hz). The growth of a crack retarded at about 500 mu m in surface length under ultrasonic loading, while at about 20 mu m under rotating bending. Although striations being a typical fracture mechanism were observed under conventional loading, most of fracture surface was covered with many facets under ultrasonic loading. These facets were also observed under rotating bending in nitrogen gas. The difference in growth mechanism depending on the loading frequency and the retardation of a crack growth under ultrasonic loading may be caused by the environment at the crack tip due to high crack growth rate under ultrasonic loading. (C) 2012 The Chinese Society of Theoretical and Applied Mechanics.

引用

页数：4

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