摘要
文章根据波音737CL(传统型)飞机龙骨梁ADF(自动定位仪)天线组件固定孔区域的剥蚀规律和外载荷,采用有限元分析手段并通过受载和不受载状态下海洋性盐雾环境腐蚀对比试验,研究了剪应力在剥蚀中的作用。结果表明:固定孔区域材料晶粒L方向和LT方向正应力分布基本相同。受载状态下固定孔打磨区域不到两年就重新存在严重剥蚀,未受载状态固定孔打磨区域三年多也未出现剥蚀。研究表明,龙骨梁材料晶粒ST方向交变剪应力加速了剥蚀的形成和扩展,恒定剪应力对剥蚀的形成和扩展没有影响。
Based on the exfoliation corrosion） rules and load styles around automatic direction finder antenna installing hole of B737CL keel beam,the role of shear stress on EFC of keel beam were investigated by means of finite element analysis and corrosion test in oceanic environment without load and with operating load.The results show that the axial stress of grain L and LT around the hole was almost same.Severe EFC had been observed on the blended area with operating load less than two years.No EFC had been observed on the blended area without load even more than three years.We can draw a conclusion that alternative shear stress on ST can accelerate EFC of 7150 alloy.Constant shear stress had no effect on EFC of 7150 alloy.
出处
《南昌航空大学学报（自然科学版）》
CAS
2011年第1期27-32,共6页
Journal of Nanchang Hangkong University(Natural Sciences)
关键词
波音737CL
龙骨梁
剥蚀
交变剪应力
恒定剪应力
B737CL
keel beam
exfoliation corrosion
alternative shear stress
constant shear stress
