摘要
疲劳失效是机械失效的主要失效形式,以2024铝合金材料为研究对象,分析了镜像铣成形工艺和化铣成形工艺对材料疲劳性能的影响。采用成组试验法开展疲劳性能力学试验,探索2024铝合金在130 MPa、140 MPa和149 MPa应力水平下的疲劳性能。结果表明,镜像铣工艺的总体稳定性优于化铣,抗拉强度方面相当,镜像铣试验件的寿命标准差约为化铣的3倍;在三级应力水平下,镜像铣试验件的中值对数疲劳寿命均优于化铣。通过试验获取了2024铝合金在存活率分别为50%、95%和99.9%下的应力水平与疲劳寿命关系曲线,为定量分析镜像铣和化铣工艺对材料疲劳性能的影响提供了参考。
Fatigue failure is the main failure mode of mechanical failure.The effects of mirror milling and chemical milling on fatigue performance of 2024 Al alloy were analyzed in this paper.The fatigue properties of 2024 Al alloy were explored at 130 MPa,140 MPa and 149 MPa stress levels by using group test method.The results show that the overall stability of the mirror milling is better than that of the chemical milling,the tensile strength is comparable,and the standard deviation of the life of the mirror milling test pieces is about three times that of the chemical milling;the median logarithmic fatigue life of the mirror milling test pieces is better than that of the chemical milling at all three stress levels.The relationship curves between stress level and fatigue life of 2024 Al alloy at 50%,95%and 99.9%survival rates are obtained,which provide a reference for quantitative analysis of the effects of mirror milling and chemical milling processes on fatigue performance of the material.
作者
杨青平
舒茂盛
卫星驰
茅健
曹珍珍
钟柳春
YANG Qingping;SHU Maosheng;WEI Xingchi;MAO Jian;CAO Zhenzhen;ZHONG Liuchun(Chengdu Useful Technology Co.,Ltd.,Chengdu 610511,China;AVIC Chengdu Aircraft Design and Research Institute,Chengdu 610091,China;Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai TOP Numerical Control Technology Co.,Ltd.,Shanghai 201108,China)
出处
《航空制造技术》
CSCD
北大核心
2022年第22期94-100,107,共8页
Aeronautical Manufacturing Technology
基金
国家科技重大专项(2019ZX04020001)。
关键词
镜像铣削
化学铣削
2024铝合金
疲劳寿命
统计分析
机械失效
Mirror milling
Chemical milling
2024 Al alloy
Fatigue life
Statistical analysis
Mechanical failure
