北京航空航天大学学报 ›› 2010, Vol. 36 ›› Issue (8): 965-968.

• 论文 • 上一篇    下一篇

比例加载下应力幅比对2A12-T4疲劳寿命的影响

时新红, 张建宇, 鲍 蕊, 费斌军   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100191
  • 收稿日期:2009-06-02 出版日期:2010-08-30 发布日期:2010-09-07
  • 作者简介:时新红(1981-),女,山东德州人,博士生, shixinhong@buaa.edu.cn.
  • 基金资助:

    凡舟基金资助项目(20100501)

Effect of stress amplitude on high-cycle fatigue life of 2A12-T4 aluminum alloy under proportional loading

Shi Xinhong, Zhang Jianyu, Bao Rui, Fei Binjun   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2009-06-02 Online:2010-08-30 Published:2010-09-07

摘要: 采用2A12-T4铝合金漏斗形试件,针对不同拉扭应力幅比,进行了比例加载下多轴高周疲劳寿命试验,研究了不同应力幅比对多轴高周疲劳寿命的影响.针对试验结果,采用3种常用的多轴高周疲劳寿命预测模型,包括等效应力准则、应力不变量准则、临界面准则进行了预测.结果表明:在相同的Von-Mises等效应力下,随着扭转应力幅与拉压应力幅比值的增大,疲劳寿命逐渐升高.等效应力准则的预测结果或过于危险,或过于安全;应力不变量准则的预测结果认为应力幅比的变化对疲劳失效没有影响,与试验结果不符;临界面准则的预测结果优于其他准则.

Abstract: Fatigue life experiments with funneled-shape specimens were conducted to investigate the effect of stress amplitude on multi-axial high-cycle fatigue failure of 2A12-T4 aluminum alloy under tension-torsion proportional loading. Based on the experiment results, three kinds of life-prediction criteria, which were widely used for multi-axial high-cycle fatigue analysis, were discussed. The results showe that under the same von-Mises equivalent stress, fatigue life raised gradually when the ratio of stress amplitude in tension and torsion increased. Fatigue life of uniaxial tension is the shortest and that of pure torsion is the longest. The forecast results of equivalent stress criteria are either too dangerous, or too conservative. Stress invariant criteria cannot predict the impact of stress-amplitude ratio on multi-axial high-cycle fatigue failure. Critical-plane criteria has better prediction capability than others.

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发