基于蚀坑形貌特征的2198-T8铝锂合金预腐蚀疲劳寿命预测

doi:10.11896/cldb.21080028

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Abstract The fatigue life of 2198-T8 aluminum-lithium alloy was tested by the pre-corrosion fatigue test under a salt spray environment, and the corrosion fatigue life was predicted based on the morphology of corrosion pits. The results show that under the same corrosion environment parameters, the length, width and depth of the pits all satisfy the log-normal distribution. The pit shape was simplified into a semi-ellipsoidal geometric model, combined with the test life data; through ABAQUS finite element simulation, digital image correlation crack monitoring technology and theoretical calculations, the equivalent between the pit depth and the equivalent initial crack length was obtained. Finally, the Paris formula is used to predict the life of the pre-corroded fatigue specimens under different parameters, and the prediction results are all within 1.5 times the dispersion zone.

Key words： aluminum-lithium alloy corrosion fatigue life prediction pit morphology

Published: 10 November 2022 Online: 2022-11-03

CLC number:

V252

Fund:High-level Achievement Cultivation Project of Fundamental Research Funds for the Central Universities for Civil Aviation University of China (3122022PY09).

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	CHEN Yajun
	WEI Disheng
	PENG Jianshu
	SONG Xianjie

Cite this article:

CHEN Yajun,WEI Disheng,PENG Jianshu, et al. Pre-corrosion Fatigue Life Prediction of 2198-T8 Aluminum-Lithium Alloy Based on Morphological Characteristics of Corrosion Pits[J]. Materials Reports, 2022, 36(21): 21080028-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21080028 OR http://www.mater-rep.com/EN/Y2022/V36/I21/21080028

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