潮湿空气环境对预腐蚀铝合金疲劳性能影响研究  

Influence of Wet Air on Fatigue Performance of Pre-corroded Aluminum Alloy

作　　者：张啸尘[1,2] 谢里阳[1,2] 周松[1,2] 马洪义[1,2] 白恩军 

机构地区：[1]东北大学机械工程与自动化学院现代设计与分析研究所,沈阳110819 [2]东北大学航空动力学装备振动及控制教育部重点实验室,沈阳110819

出　　处：《失效分析与预防》2015年第4期197-201,共5页Failure Analysis and Prevention

基　　金：国家自然科学基金(51335003);高等学校博士学科点专项科研基金(20110042130003)

摘　　要：采用预腐蚀铝合金7XXX应力集中系数为Kt=1和Kt=3试件进行了试验室空气环境和潮湿空气环境下的疲劳寿命试验及升降法试验,研究了潮湿空气环境对预腐蚀铝合金7XXX疲劳性能的影响。结果表明:潮湿空气环境显著降低了预腐蚀铝合金7XXX的疲劳性能,当假设疲劳强度服从正态分布时,潮湿空气环境对预腐蚀铝合金7XXX疲劳强度均值的影响系数分别为0.968(Kt=1)和0.941(Kt=3),安全寿命是试验室环境的18.38%(Kt=1)和28.94%(Kt=3),在潮湿空气环境中疲劳寿命的分散性变大,潮湿空气环境对服从双参数威布尔分布疲劳寿命特征值和规定置信度、可靠度寿命值的腐蚀影响系数,分别为0.785 3(Kt=1),0.669 4(Kt=3)和0.183 8(Kt=1),0.289 4(Kt=3)。Fatigue life and up-down experiments（ Kt= 1 and Kt= 3） with pre-corroded specimens were conducted in laboratory air and wet air atmosphere. The aim is to investigate the corrosion influence of wet air on fatigue performance of 7XXX aluminum alloy. The results show that wet air significantly reduces both fatigue life and strength. Suppose fatigue strength conforms to normal distribution,then the influence coefficient of wet air on the average value of fatigue strength is 0. 968（ Kt= 1） and 0. 941（ Kt= 3）,and the safety life is the 18. 38%（ Kt= 1） and 28. 94%（ Kt= 3） of that in laboratory air. Wet air environment enlarges the dispersivity of fatigue life. The influence coefficient of wet air on fatigue life characteristic value as well as specified credibility and reliability life value are 0. 785 3（ Kt= 1） and 0. 669 4（ Kt= 3） as well as 0. 183 8（ Kt= 1） and 0. 289 4（ Kt=3）,respectively.

关 键 词：预腐蚀 潮湿空气 疲劳性能 铝合金 

分 类 号：O346.2[理学—固体力学] V216.3[理学—力学]