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�������պ����ѧѧ�� 2005, Vol. 31 Issue (12) :1293-1298    DOI:
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����, ����, ����, �����*
�������պ����ѧ ���տ�ѧ�빤��ѧԺ, ���� 100083
Generality analysis of the pre-corrosion influence on the fatigue life for aircraft structure
He Xiaofan, Wang Lei, Liu Wenting, Xiang Jinwu*
School of Aeronautic Science and Technology, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ Ϊ�о��غ��ס����Ӧ��ˮƽ�����Ƴߴ��ƣ������Ԥ��ʴӰ��ϵ����C(T)��Ӱ��,�����˻���ƣ�����������������ֲ���C(T)�Աȷ�.����ͣ��Ԥ��ʴ�Խṹƣ��������Ӱ����ɿ�����C-T���߱�ʾ,��Ԥ��ʴƣ������λ�ڳ�������,���ٶ�������������ֲ�,C(T)ΪԤ��ʴ���δ��ʴ�ṹ���������ı�ֵ.ȡԤ��ʴƣ�������ֲ���������״����Ϊ���ϳ���,���ü�����Ȼ����������������,�õ���ֲ�����,�Ӷ�������C(T)�������ķֲ�����,�����˲�ͬ�����µĪ�C(T)��ͳ�ƶԱȷ�,����C-T����ͨ���Է���. �������ݷ�������,��ȡƣ�����������������ֲ�ʱ,C-T�������غ��ס�Ӧ��ˮƽ�����Ƴߴ�����޹�.��
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Abstract�� To analyze the influence of the different spectra loading, constant amplitude loading and crack size on the pre-corrosion influence factor ��(C(T))��,the ��C(T)�� test assuming the fatigue life following the two-parameter Weibull distribution was proposed. The ��C(T)�� shows the pre-corrosion influence on aircraft structural life under different ground parking time is the ratio of pre-corrosion characteristic life to un-corrosion characteristic life when the pre-corrosion fatigue life located in the long life range. Assuming the slope of the Weibull distribution is material constant, and the unbiased characteristic life which was estimated with the maximum likehood estimation(MLE), the probability density function of the estimator was determined. The distribution function of the statistic ��C(T)�� was obtained, the ��C(T)�� contrast approach was proposed, and used to test the hypothesis that the ��C-T�� curve is general between different spectra loading, constant amplitude loading and crack size, the fatigue testing data shows that the ��C-T�� curve is weak-correlation with these influence factors.
Keywords�� corrosion   fatigue   life   Weibull distribution   maximum likehood estimation   pre-corrosion   aircraft structures     
Received 2004-09-30;
About author: ��С��(1976-),��,����������,��ʿ��, xiaoxiangbalao@163.com.
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��С��, ����, ����, �����.�����������ֲ���C-T����ͨ���Է���[J]  �������պ����ѧѧ��, 2005,V31(12): 1293-1298
He Xiaofan, Wang Lei, Liu Wenting, Xiang Jinwu.Generality analysis of the pre-corrosion influence on the fatigue life for aircraft structure[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(12): 1293-1298
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