CORROSION FATIGUE CRACK INITIATION LIFE OF AN ALUMINUM ALLOY UNDER VARIABLE AMPLITUDE LOADING

J Chin Soc Corr Pro

1998, Vol. 18

Issue (3): 178-186 DOI:

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CORROSION FATIGUE CRACK INITIATION LIFE OF AN ALUMINUM ALLOY UNDER VARIABLE AMPLITUDE LOADING

WANG Rong (Xi'an Petroleum Institute; Xi'an 710065)ZHENG Xiu-lin (Northwestern Polytechnical University; Xi'an 710072)

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Abstract Corrosion fatigue crack initiation(CFCI) life of LY12CZ aluminum alloy notched specimens in 3.5% NaCl solution under variable amplitude loading block spectra was investigated experimentally. It was shown that overloading in the spectrum made the CFCI life longer considerably, and the loading sequence and the overloading type had a significant effect. So the overloading effect must be considered in the prediction of the CFCI life under variable amplitude loading. According to the CFCI life curves that revealed the overloading and corrosion effect, a study was made on applying Miner's accumulative damage rule to predict CFCI life under variable amplitude loading. A model was established and was thereafter used to predict the CFCI life under the selected spectra. The predicting results showed good agreement with the testing. The distribution of the CFCI life under one spectrum was determined by using ranking methods. Corrosion effect on CFCI under variable amplitude loading was also discussed.

Key words: Corrosion fatigue Crack initiation Variable amplitude loading Miner's rule Corrosion effect

Received: 25 June 1998

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WANG Rong (Xi'an Petroleum Institute; Xi'an 710065)ZHENG Xiu-lin (Northwestern Polytechnical University; Xi'an 710072). CORROSION FATIGUE CRACK INITIATION LIFE OF AN ALUMINUM ALLOY UNDER VARIABLE AMPLITUDE LOADING. J Chin Soc Corr Pro, 1998, 18(3): 178-186.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I3/178

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