北京航空航天大学学报 ›› 2021, Vol. 47 ›› Issue (12): 2434-2441.doi: 10.13700/j.bh.1001-5965.2020.0477

• 论文 • 上一篇    下一篇

基于损伤力学的含预腐蚀损伤铝合金的疲劳寿命预测

詹志新1,2, 余洵3, 胡伟平1, 孟庆春1   

  1. 1. 北京航空航天大学 航空科学与工程学院, 北京 100083;
    2. 深圳北航新兴产业技术研究院, 深圳 518000;
    3. 中国直升机设计研究所, 景德镇 333001
  • 收稿日期:2020-08-31 发布日期:2022-01-06
  • 通讯作者: 胡伟平 E-mail:huweiping@buaa.edu.cn
  • 基金资助:
    国家自然科学基金(12002011);广东省基础与应用基础研究基金(2019A1515110334)

Fatigue life prediction of aluminum alloy with pre-corrosion damage based on damage mechanics

ZHAN Zhixin1,2, YU Xun3, HU Weiping1, MENG Qingchun1   

  1. 1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100083, China;
    2. Shen Zhen Institute of Beihang University, Shenzhen 518000, China;
    3. China Helicopter Research and Development Institute, Jingdezhen 333001, China
  • Received:2020-08-31 Published:2022-01-06
  • Supported by:
    National Natural Science Foundation of China (12002011); Basic and Applied Basic Research Foundation of Guangdong Province (2019A1515110334)

摘要: 在工程结构中,腐蚀疲劳破坏是一种常见的现象,腐蚀坑处往往形成疲劳源,严重影响材料的疲劳特性。基于连续损伤力学理论,提出了含预腐蚀损伤铝合金疲劳寿命预测方法。首先,将腐蚀的影响分为2个方面,即腐蚀造成局部初始损伤和腐蚀形成的蚀坑造成局部应力集中;其次,建立了考虑预腐蚀损伤的疲劳损伤演化方程,并实现了相应的数值解法;然后,根据预腐蚀疲劳试验结果与数值计算结果,得到预腐蚀引起的材料初始损伤;最后,采用数值解法,对含预腐蚀坑的铝合金进行了寿命预估,并与试验结果进行对比,验证了所提方法的有效性。

关键词: 腐蚀, 疲劳损伤, 损伤力学, 有限元, 铝合金

Abstract: In engineering structures, the corrosion fatigue failure is a common phenomenon. The fatigue crack often occurs around the corrosion pit, which seriously affects the fatigue characteristics of materials. In this paper, based on the continuous damage mechanics, a method is proposed for the fatigue life prediction of aluminum alloy with pre-corrosion damage. First, the influence of corrosion is studied from two aspects: one is the local initial damage caused by corrosion, and the other one is the local stress concentration caused by corrosion pit. Then, the fatigue damage evolution equations considering pre-corrosion damage are established and the related numerical solution is implemented. After that, according to the results of pre-corrosion fatigue test and numerical prediction, the initial damage of material caused by pre-corrosion is obtained. Finally, the fatigue life of the aluminum alloy with pre-corrosion pit is predicted by the proposed method, and the predicted results are compared with the experimental results, which verifies the effectiveness of the proposed method.

Key words: corrosion, fatigue damage, damage mechanics, finite element, aluminum alloy

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发