摘要
现代高性能战斗机受总体布置影响,机体外形常出现诸多反曲曲面。当反曲加筋壁板承受面外弯曲载荷时,筋条终止端与蒙皮之间呈现出明显的剥离倾向,而反曲的几何特征进一步加剧了这一问题。筋条终止端的结构刚度发生突变会导致显著的应力集中现象,进而引发筋条与蒙皮界面间的脱粘问题,降低结构的初始损伤载荷。提出6种不同反曲加筋壁板筋条终止端设计构型,进行四点弯曲加载测试。结果表明:左加筋壁板筋条终止端采用端头隔离可以降低结构工艺敏感性,初始损伤载荷提高20%左右,载荷的分散性降低;在筋条终止端附近增加底板或者增厚L腿均能显著提高极限破坏载荷,提升幅度分别为39.78%和58.28%。
Modern high-performance fighter aircraft are affected by the overall arrangement,and many anti-curved surfaces often appear in the fuselage shape.When the anti-curved reinforced wall panels are subjected to out-of-plane bending loads,there is an obvious tendency of peeling between the termination ends of the bars and the skin,which is further exacerbated by the geometrical characteristics of the anti-curved surfaces.The sudden change in structural stiffness at the termination end of the bars leads to a significant stress concentration phenomenon,which in turn trig-gers the debonding problem between the bar-skin interface,resulting in a reduction of the initial damage load of the structure.Six different design configurations of the termination end of the bar of a reverse curvature reinforced wall panels are proposed,and four-point bending loading tests are carried out.The results show that the use of end isola-tion at the termination end of the bar of a left-reinforced wall panel can reduce the sensitivity of the structural process,improve the initial damage load by about 20%,and reduce the dispersion of the load.The addition of a base plate near the termination end of the bar or the thickening of the L-legs significantly can improve the ultimate damage load by 39.78%and 58.28%respectively.
作者
常楠
范帅杰
刘伟先
陈振勇
CHANG Nan;FAN Shuaijie;LIU Weixian;CHEN Zhenyong(AVIC Chengdu Aircraft Design&Research Institute,Chengdu 610041,China)
出处
《航空学报》
北大核心
2025年第21期182-190,共9页
Acta Aeronautica et Astronautica Sinica
关键词
筋条终止端
端头隔离
反曲加筋壁板
四点弯曲
选型试验
bar termination end
end isolation
reverse curvature reinforced wall panels
four-pointbending
selection test
