Influence of mean stress on Ti6Al4V fatigue crack growth at very high frequency

被引：22

作者：

Bathias, C

ElAlami, K

Wu, TY

机构：

[1] CNAM, Laboratoire de Métallurgie, 75003, Paris, 2, Rue Conté

来源：

ENGINEERING FRACTURE MECHANICS | 1997年 / 56卷 / 02期

关键词：

D O I：

10.1016/0013-7944(95)00256-1

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The present study deals with the fracture mechanics behaviour of a titanium alloy - Ti6Al4V (TA6V french mark) in ultrasonic fatigue. Besides the development of corresponding experimental techniques, this paper presents firstly the finite element method calculation of stress intensity factor K-I in ultrasonic fatigue with a positive mean stress; then fatigue crack growth (FCG) rates of Ti6Al4V at high frequency at room temperature and with stress ratio R between -1 and 0-0.9. The thresholds are determined up, to ca 10(-11) m/cycle. The fracture mechanisms have been observed and analyzed metallographically and microfractographically under a scanning electron microscope to compare with conventional fatigue. In adition, some cumulation experiments of ultrasonic fatigue with slow fatigue have been carried out. Copyright (C) 1996 Elsevier Science Ltd.

引用

页码：255 / 264

页数：10