预腐蚀对多部位损伤发生概率的影响  

Effect of pre-corrosion on the MSD occurrence probability

作　　者：张建宇[1] 袁军[1] 时新红[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《北京航空航天大学学报》2013年第1期27-30,41,共5页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：针对飞机结构中存在的多部位损伤(MSD,Multiple Side Damage)问题,对预腐蚀后多细节结构MSD发生概率进行分析研究.预腐蚀条件选为3.5%NaCl溶液浸泡240 h.通过7B04-T74铝合金单细节预腐蚀-疲劳及常规环境疲劳试验,得到了预腐蚀影响系数C.确定了预腐蚀后的MSD发生概率与常规疲劳试验MSD发生概率之间的关系.建立了预腐蚀后的MSD发生概率公式.通过与试验结果对比表明:新的公式可以很好地反映试验结果.Aimed at the multiple side damage （MSD） existed in the typical aircraft structural compo- nents,the occurrence probability of multiple side damage was investigated. The condition of pre-corrosion was dipping in 3.5% NaC1 solution for 240 hours. The influence coefficient C was obtained based on the pre-corro- sion and the normal fatigue experiment of 7B04-T74 aluminum alloy single detail specimens. The relationship could be estalished between the MSD occurrence probability under the specified pre-corrosion and the MSD oc- currence probability under the normal fatigue condition. The formula of MSD occurrence probability after per- corrosion was gained. The calculation and experimentation results were compared. Results show that the new formula can compute the MSD occurrence probability after pre-corrosion commendably.

关 键 词：多部位损伤 预腐蚀 发生概率 影响系数 

分 类 号：V215.2[航空宇航科学与技术—航空宇航推进理论与工程] O346[理学—固体力学]