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。
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.
作者
詹志新
余洵
胡伟平
孟庆春
ZHAN Zhixin;YU Xun;HU Weiping;MENG Qingchun(l.School of Aeronautic Science and Engineering,Beihang University,Beijing 100083,China;Shen Zhen Institute of Beihang University,Shenzhen 518000,China;China Helicopter Research and Development Institute,Jingdezhen 333001,China)
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2021年第12期2434-2441,共8页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金(12002011)
广东省基础与应用基础研究基金(2019A1515110334)。
关键词
腐蚀
疲劳损伤
损伤力学
有限元
铝合金
corrosion
fatigue damage
damage mechanics
finite element
aluminum alloy
