FOD对TC4合金扩散焊板材HCF性能影响  

Effect of Foreign Object Damage (FOD) on the High Cycle Fatigue (HCF) Performance of TC4 Alloy Diffusion Bonding Plate

作　　者：李百洋 刘小刚[1] 郭海丁[1] LI Bai-yang;LIU Xiao-gang;GUO Hai-ding(Nanjing University of Aeronautics and Astronautics,Jiangsu Province Key Laboratory of Aerospace Power Systems,Nanjing 210016,China)

机构地区：[1]南京航空航天大学江苏省航空动力系统重点实验室,南京210016

出　　处：《航空发动机》2018年第5期93-97,共5页Aeroengine

基　　金：航空科学基金(2015ZB52023);中央高校基本科研业务费(NS2016022)资助

摘　　要：针对外物损伤(FOD)对航空发动机宽弦空心风扇叶片高循环疲劳(HCF)性能的影响,以TC4合金3层扩散焊板件模拟宽弦空心风扇叶片典型冲击部位,采用空气炮法对TC4合金3层扩散焊板进行FOD模拟试验,对冲击角度为25°、40°和80°时的损伤状况进行了宏微观测量;采用逐级加载法对FOD后的扩散焊焊板进行HCF强度试验,获得各条件下扩散焊板件的条件疲劳极限。结果表明:在各冲击条件下,冲击角度为25°时对材料造成的损伤最严重,HCF强度降低幅度最大;FOD不仅会造成材料表面损伤,还会对内部焊缝层造成损伤。在上述因素共同作用下,扩散焊板件FOD后HCF强度显著降低,相应的疲劳缺口系数明显增大。Typical impact position of hollow wide-chord fan blades were imitated by TC4 alloy three-layer diffusion welding plate forthe effect of foreign object damage （FOD）on high cycle fatigue （HCF）performance of aeroengine hollow wide-chord fan blades. The FODsimulation test of TC4 alloy three-layer diffusion welding plate was carried out by air-gun method and the damage condition of TC4 alloywas measured by macrography and microcosmic measure when the impact angle was 25°, 40° and 80°. The fatigue limit of diffusion weldingplate was obtained under various conditions by HCF strength test of diffusion welding plate using stepwise loading method after FOD. Theresults show that the damage of plate and the decrease of HCF strength are the most serious under various impact conditions when theimpact angle is 25°. FOD can not only cause damage to the surface of material,but also cause damage to the inner welding layer. The HCFstrength of diffusion welding plate decreased significantly after FOD, and the corresponding fatigue notch coefficient increased obviouslyunder the combined action of the above factors.

关 键 词：TC4合金 扩散焊 外物损伤 高循环疲劳 宽弦空心风扇叶片 航空发动机 

分 类 号：V232.3[航空宇航科学与技术—航空宇航推进理论与工程]