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。由于筋条终止端处的结构刚度发生突变，导致显著的应力集中现象，这进而引发了筋条与蒙皮界面间的脱粘问题，使得结构的初始损伤载荷降低。本文提出了六种不同反曲加筋壁板筋条终止端设计构型，进行了四点弯曲加载测试，结果标明，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 aircrafts are affected by the overall arrangement, and many anticurved surfaces often appear in the fuselage shape. When the anticurved 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 anticurved surfaces. The sudden change in structural stiffness at the termination end of the bars leads to a significant stress concentration phenomenon, which in turn triggers the debonding problem between the bar-skin interface, resulting in a reduction of the initial damage load of the structure. In this paper, six different design configurations of the termination end of the bar of a reverse curvature reinforced wall plate are proposed, and four-point bending loading tests are carried out. The results indicate that the use of end isolation at the termination end of the bar of a left-reinforced wall plate reduces the sensitivity of the structural process, improves the initial damage load by about 20%, and reduces 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 improves the ultimate damage load by 39.78% and 58.8% respectively, which is the same as that of a left-reinforced wall plate. 39.78% and 58.28%, respectively.
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