摘要
为探究腐蚀对5052铝合金(AA5052)自冲铆接头性能的影响,以0.6 mol/L的NaCl溶液作为腐蚀液,采用周期浸没的方法加速腐蚀,并对不同腐蚀时间的接头进行静力学和疲劳测试,基于幂函数拟合各接头的F-N曲线,通过SEM对接头疲劳断口进行分析,结合Paris公式及相关推论预测腐蚀接头疲劳寿命。结果显示,腐蚀周期内腐蚀对接头的静力学性能及失效形式未产生不利影响;未腐蚀接头的疲劳寿命整体高于腐蚀接头,中寿命区变化幅度最明显,腐蚀介质和载荷水平共同影响接头的疲劳寿命;短期盐腐蚀不但会改变接头疲劳断裂的失效特征,而且会使接头产生多个疲劳裂纹源;该疲劳寿命预测方法,针对中、短寿命区预测效果较好。
In order to explore the influence of corrosion on the performance of self-piercing riveted(SPR)joints in 5052 aluminum alloy(AA5052),0.6 mol/L NaCl solution was used as the corrosive liquid,and the corrosion was accelerated by periodic immersion.The joints with different corrosion times were subjected to static and fatigue tests.The F-N curve of each joint was fitted based on power function,the fatigue fracture of the joint was analyzed by SEM,and the fatigue life of the corroded joint was predicted based on the Paris formula and related inferences.The results show that corrosion has no adverse influence on the static performance and failure mode of the joint during the corrosion durations studied in this paper;the fatigue life of uncorroded joints is generally higher than that of corroded joints,and the range of changes in the medium life zone is the most obvious.Corrosive medium and load level affect the fatigue life of the joints together;the short-term salt corrosion will not only change the failure characteristics of the joint fatigue fracture,but also make the joint produce multiple fatigue cracks.The fatigue life prediction method has a better prediction effect for the medium and short life zones.
作者
冯震
邢保英
何晓聪
曾凯
余康
FENG Zhen;XING Baoying;HE Xiaocong;ZENG Kai;YU Kang(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第1期145-149,共5页
Materials Reports
基金
国家自然科学基金(51565022)
云南省应用基础研究计划青年项目(14051848)。
关键词
盐腐蚀
自冲铆
周期浸没实验
疲劳测试
寿命预测
salt corrosion
self-piercing riveted
periodic immersion experiment
fatigue test
life prediction
