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本文通过理论分析和试验，对轴向压力作用下的弹塑性圆柱壳体的屈曲特性进行研究。就理论分析而言，根据改进的拉格朗日方程建立有限元程序，研究非线性几何图形和材料特性，对轴向屈曲问题进行分析。为了避免接近屈曲载荷时数字发散，在求解过程中采用迭代位移控制图法。假设直径与厚度比为２５至４００之间，采用压力试验机进行轴向屈曲试验。铝制试件的直径与厚度比为１００和１３３。结果证明沿圆柱壳体轴向的初始厚度的变化使屈曲强度减弱。长度对直径比和边界条件对屈曲载荷影响较小．但会产生各种后期屈曲特性。
In this paper, the buckling characteristics of elasto-plastic cylindrical shells under axial pressure are studied through theoretical analysis and experiments. For theoretical analysis, a finite element program was established based on the improved Lagrangian equation to study the nonlinear geometry and material properties and analyze the axial buckling problem. In order to avoid numerical divergence near buckling loads, an iterative displacement control map method is used in the solution process. Assuming a diameter-to-thickness ratio between 25 and 400, the axial buckling test was performed using a pressure tester. The diameter and thickness ratio of the aluminum specimens are 100 and 133. The results demonstrate that the change in initial thickness along the axis of the cylindrical shell weakens the buckling strength. The length-to-diameter ratio and boundary conditions have little effect on the buckling load. However, various late buckling characteristics are produced.