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

材料导报

2022, Vol. 36

Issue (21): 21080028-7 https://doi.org/10.11896/cldb.21080028

金属与金属基复合材料

基于蚀坑形貌特征的2198-T8铝锂合金预腐蚀疲劳寿命预测

陈亚军^1,*, 韦第升², 彭剑书¹, 宋先捷¹

1 中国民航大学中欧航空工程师学院,天津 300300
2 中国融通科学研究院集团有限公司,北京 100036

Pre-corrosion Fatigue Life Prediction of 2198-T8 Aluminum-Lithium Alloy Based on Morphological Characteristics of Corrosion Pits

CHEN Yajun^1,*, WEI Disheng², PENG Jianshu¹, SONG Xianjie¹

1 Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China
2 China Rong Tong Academy of Sciences Group Corporation Limited, Beijing 100036, China

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摘要通过盐雾环境条件下的预腐蚀疲劳试验测试2198-T8铝锂合金的疲劳寿命,并基于蚀坑形貌对腐蚀疲劳寿命进行了预测。结果表明,在同一腐蚀环境参数下,蚀坑的长度、宽度及深度均满足对数正态分布。将蚀坑形貌简化为半椭球状的几何模型,与试验寿命数据相结合,通过ABAQUS有限元模拟、数字图像相关裂纹监控技术和理论计算,得到蚀坑深度与等效初始裂纹长度之间的等价关系,最后使用Paris公式对不同参数下的预腐蚀疲劳试样进行寿命预测,预测结果均处于1.5倍分散带以内。

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关键词: 铝锂合金腐蚀疲劳寿命预测蚀坑形貌

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

出版日期: 2022-11-10 发布日期: 2022-11-03

ZTFLH:

V252

基金资助: 中央高校基本科研业务费高水平成果培育专项(3122022PY09)

通讯作者: * yjchen@cauc.edu.cn

作者简介: 陈亚军,中国民航大学教授。1999年毕业于长春工业大学,获材料加工工程学士学位。2002年毕业于长春工业大学,获材料加工工程硕士学位。2010年毕业于天津大学,获材料加工工程博士学位。主要从事飞机结构与材料方面的研究。在国内外重要期刊发表文章50余篇。

引用本文:

陈亚军, 韦第升, 彭剑书, 宋先捷. 基于蚀坑形貌特征的2198-T8铝锂合金预腐蚀疲劳寿命预测[J]. 材料导报, 2022, 36(21): 21080028-7.
CHEN Yajun, WEI Disheng, PENG Jianshu, SONG Xianjie. Pre-corrosion Fatigue Life Prediction of 2198-T8 Aluminum-Lithium Alloy Based on Morphological Characteristics of Corrosion Pits. Materials Reports, 2022, 36(21): 21080028-7.

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http://www.mater-rep.com/CN/10.11896/cldb.21080028 或 http://www.mater-rep.com/CN/Y2022/V36/I21/21080028

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