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�������պ����ѧѧ�� 2003, Vol. 29 Issue (3) :218-220    DOI:
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Fatigue Life Estimation of Specimen under Spectrum Load��Using Fuzzy Miner��s Rule
Jia Xinglan, Liu Wenting*
Dept. of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics

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Abstract�� Fatigue damage exhibits some "fuzzy" character when the fatigue stress in load spectrum is lower slightly than fatigue limit. A Miner-s rule considering this "fuzzy" damage character is established by means of membership function of fuzzy mathematics. When a specimen is subjected to programmed spectrum loads, the estimation formula of fatigue life is derived according to regular Miner's rule and fuzzy Miner's rule. Comparing the results of calculations and fatigue experiments, it is shown that the estimation error of fatigue life is decreased by 18.33% with using fuzzy Miner's rule.
Keywords�� fatigue life   fuzzy variables   fatigue tests   membership function   estimation     
Received 2001-09-28;
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Jia Xinglan, Liu Wenting.Fatigue Life Estimation of Specimen under Spectrum Load��Using Fuzzy Miner��s Rule[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2003,V29(3): 218-220
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