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�������պ����ѧѧ�� 1998, Vol. 24 Issue (2) :203-206    DOI:
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High Cycle Fatigue Model Based on Brittle Damage Mechanism
Xiao Yingchun, Li Songnian, Gao Zhentong*
Beijing University of Aeronautics and Astronautics,Dept. of Flight Vihicle Design and Applied Mechanics

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Abstract�� An isotropic continuum damage mechanics model for high cycle fatigue derived from irreversible thermodynamic dissipative theory is presented.The model is different from Lemaitre model in damage mechanisms.The former is based on a brittle mechanism,and the later is ductile.The model incorporates successfully the high cycle fatigue into a unified thermodynamic framework.The effect of stress ratio R is considered in its damage evolution law.According to the high cycle fatigue SN curve under symmetrical loading,a Log S Log N curve for an arbitrary stress ratio R can be derived by using this model.The model has been applied to the smooth specimen of LC9 high strengthen aluminum alloy.A good agreement between theoretical Log S Log N curves and experimental ones is obtained.
Keywords�� fatigue fracture   fatigue process   thermodynamics   continuum damage mechanics   brittle damage mechanism     
Received 1996-10-30;
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Фӭ��, ������, ����ͬ.���ڴ������˻��Ƶĸ���ƣ��ģ��[J]  �������պ����ѧѧ��, 1998,V24(2): 203-206
Xiao Yingchun, Li Songnian, Gao Zhentong.High Cycle Fatigue Model Based on Brittle Damage Mechanism[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 1998,V24(2): 203-206
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