7050-T7451铝合金试件的疲劳安全寿命估算

任旭东; 姜大伟; 张永康; 张田; 罗新民

7050-T7451铝合金试件的疲劳安全寿命估算

江苏大学机械工程学院江苏省光子制造科学与技术重点实验室,镇江 212013

基金项目: 国家自然科学基金(50735001,50905080); 中国博士后基金(20100471385); 江苏大学高级人才启动基金(10jd066)

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出版历程
- 收稿日期: 2009-11-30
- 修回日期: 2010-02-05
- 刊出日期: 2011-01-28

Estimation of fatigue safe lives of 7050-T7451 aluminum alloy samples

Jiangsu Key Laboratory of Laser Manufacture Science and Technology Ministry, College of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China

摘要

摘要: 对7050-T7451铝合金试件的三类不同试样激光冲击强化处理,研究其7组疲劳寿命值,并对铝合金试件的疲劳试验结果分别用单侧容限因数法和二维Weibull分布法进行疲劳安全寿命估算及比较.结果表明,激光冲击强化作用大大提高了铝合金试样的疲劳寿命;在考虑置信度和可靠度的前提下,单侧容限因数法能得到一个确切的疲劳安全寿命估算值,而二维Weibull分布法则得到一个疲劳安全寿命值的取值范围;考虑到工程应用中成本、安全等因素对疲劳安全寿命值的不同要求,二维Weibull分布法更具有工程适用性.
- 疲劳安全寿命 /
- 二维Weibull分布法 /
- 激光冲击强化 /
- 单侧容限因数法 /
- 7050-T7451铝合金
Abstract: Laser shock processing of three categories of 7050-T7451 aluminum alloy samples was carried out,and their seven groups of fatigue life values were studied.To obtain the values of fatigue safe life of 7050-T7451 aluminum alloy specimens,the unilateral tolerance factor statistical analysis method and two-dimensional Weibull distribution method were used to predict the values of fatigue safe life,respectively,and these two kinds of calculation results were compared.The results show that:the fatigue life of aluminum alloy samples is enhanced greatly by laser shock processing,and in consideration of the confidence and reliability,the unilateral tolerance factor method can get an exact estimation value of the fatigue safe life,while the two-dimensional Weibull distribution method can get the range of values of fatigue safe life;considering different requirements of capital and safety,etc,on the fatigue safe life,the two-dimensional Weibull distribution method is more suitable for engineering applications.
- fatigue safe life /
- two-dimensional Weibull distribution method /
- laser shock processing /
- unilateral tolerance factor method /
- 7050-T7451 aluminum alloy

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参考文献(12)

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