EFFECT OF PREQUENCY AND OVERLOADING ON CORROSION FATIGUE CRACK INITIATION LIFE

J Chin Soc Corr Pro

1996, Vol. 16

Issue (4): 256-262 DOI:

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EFFECT OF PREQUENCY AND OVERLOADING ON CORROSION FATIGUE CRACK INITIATION LIFE

WANG Rong (Xi'an Petroleum Institute)ZHENG Xiulin (Northwestern Polytechnical University)

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Abstract Effect of loading frequency and overloading on corrosion fatigue crack initiation (CFCI) life of notched aluminum alloy LY12CZ specimens in 3.5% NaCI solution were investigated. The frequency had no considerable effect on the CFCI life at the frequency range from 10 Hz to 1 Hz. Tension overloads prolonged the CFCI life, especially in the longer life range. The overloads increased the CFCI threshold value considerably, but had less effect on the CFCI resistance coefficient. The CFCI threshold was in proportion to the strain value at the notch roots caused by overloads. Based on analysis of the experimental results a CFCI life expression, which revealed the quantitative effect of overloading, was put forward. The mechanism of overloading effect was discussed.

Key words: Corrosion fatigue Crack initiation Load frequency Tension overload Aluminum alloy

Received: 25 August 1996

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Cite this article:

WANG Rong (Xi'an Petroleum Institute)ZHENG Xiulin (Northwestern Polytechnical University). EFFECT OF PREQUENCY AND OVERLOADING ON CORROSION FATIGUE CRACK INITIATION LIFE. J Chin Soc Corr Pro, 1996, 16(4): 256-262.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I4/256

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