Abstract:In aircraft structure, large curvature curved surface structure is a kind of important structural components, such as wing leading edge, slat, fairing and so on. In the strength test of aircraft structure, there are few studies on the loading of such structures, and the existing loading methods are difficult to meet the requirements of test tensile and compression bi-directional loading. Therefore, we put forward a new type adhesive tape pull pressure pad-lever system load technology, the use of special Canvas-pad form design, adapt to the large curvature of the curved surface structure characteristics, and through the simulation calculation filled rubber piece thickness influence on load transfer uniformity, satisfied the requirements of the test thickness size right, big curvature curved surface structure so as to realize the bidirectional loading. It is verified by test that the loading technology can meet the requirements in loading precision, fatigue performance, tensile strength and ballast stability. The loading technology has been successfully applied to the flaps and slats fatigue test of a certain model. The results show that the loading technology can accurately and efficiently apply the bi-directional load of the curved surface structure with large curvature, shorten the test period and speed up the test schedule.