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本文给出了一种确定壳体结构外压临界载荷的非破坏实验方法,这是一种以壳体结构的法向挠度作为控制变量的逐步逼近法。运用这种方法,对九件由LY12-CZ铝合金制成的具有周向Ω-型筋条的柱形曲板和某机机身的3号至6号油箱内壁作了非破坏屈曲试验,准确地确定了壳体的临界压力,初步研究了周向约束对加筋柱形曲板屈曲的影响。试验结果表明,这种非破坏屈曲试验方法是成功的。
In this paper, a non-destructive experimental method for determining the critical load of the shell structure under external pressure is given, which is a gradual approximation method with the normal deflection of the shell structure as the control variable. Using this method, non-destructive buckling tests were conducted on nine cylindrical curved plates with circumferential Ω-shaped ribs made of LY12-CZ aluminum alloy and the inner walls of No. 3 to No. 6 fuel tanks of a machine body. The critical pressure of the shell is accurately determined, and the influence of the circumferential constraint on the buckling of the stiffened cylindrical curved plate is preliminarily studied. The test results show that this non-destructive buckling test method is successful.