Fatigue threshold behavior of α-phase copper alloys in desiccated air:: modulus effects

被引：8

作者：

Ahmed, TM ^{[1
]}

Tromans, D ^{[1
]}

机构：

[1] Univ British Columbia, Dept Met & Mat Engn, Vancouver, BC V6T 1Z4, Canada

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2004年 / 26卷 / 06期

基金：

加拿大自然科学与工程研究理事会;

关键词：

fatigue threshold; 70/30; copper-nickel; 90/7 aluminum bronze; brass; Young's modulus; stacking fault energy (SFE);

D O I：

10.1016/j.ijfatigue.2003.10.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The effects of load ratio (R) in the range of 0.1-0.9 on fatigue threshold behavior of three alpha-phase copper alloys were studied. Three commercial alloys of nominal composition Cu-30Ni, Cu-30Zn and 90Cu-7Al-2Fe were tested. Threshold values (DeltaK(th)) of these Cu-alloys decreased linearly with increasing R-ratio. Differences in elastic modulus (E) exerted a clear and significant effect on the threshold behavior, i.e., higher E promoted higher thresholds for the whole tested range of R-ratios. Good correlation was found between E and the threshold level under closure-free conditions, i.e., high R-ratio. Roughness-induced closure and crack micro-deflection appeared to dominate the threshold behavior. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：641 / 649

页数：9