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�������պ����ѧѧ�� 2010, Vol. 36 Issue (8) :965-968    DOI:
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ʱ�º�, �Ž���, �� ��, �ѱ��*
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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*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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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.
Keywords�� fatigue   multi-axial high-cycle fatigue   fatigue life   proportional loading   stress amplitude     
Received 2009-06-02;


About author: ʱ�º�(1981-),Ů,ɽ��������,��ʿ��, shixinhong@buaa.edu.cn.
ʱ�º�, �Ž���, ����, �ѱ��.����������Ӧ�����ȶ�2A12-T4ƣ��������Ӱ��[J]  �������պ����ѧѧ��, 2010,V36(8): 965-968
Shi Xinhong, Zhang Jianyu, Bao Rui, Fei Binjun.Effect of stress amplitude on high-cycle fatigue life of 2A12-T4 aluminum alloy under proportional loading[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2010,V36(8): 965-968
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