Determination of stress intensity factors in ultrasonic fatigue loading

被引：0

作者：

倪金刚

张学仁

聂景旭

机构：

[1] Department of Jet Propulsion

[2] Beijing University of Aeronautics and Astronautics

[3] Beijing

[4] China

来源：

ScienceinChina(SeriesE:TechnologicalSciences) | 1996年 / 02期

关键词：

ultrasonic fatigue; stress intensity factors; 3-D finite element; energy approach;

D O I：

暂无

中图分类号：

O426 [超声学];

学科分类号：

070206 ; 082403 ;

摘要：

<正> The application of displacement and energy approaches to the determination of stress intensity factors in ultrasonic fatigue crack growth (fcg) studies is discussed.The particular advantages as well as the limitations of the two approaches are evaluated.Two types of ultrasonic fatigue loading with different stress ratios are exerted on the specimen respectively: the ultrasonic fatigue loading with a stress ratio R=-1 and the ultrasonic fatigue excitations superposed upon a static mean stress with R>-1 From comparison the conclusion is formed that the energy approach developed in the investigation is more accurate,concise and suitable than commonly adopted approaches and/or formulas proposed.Experimental fcg data on a titanium alloy Ti-6Al-4V and the characteristic mechanism of the ultrasonic fcg are investigated.

引用

页码：141 / 147

页数：7