中文摘要：

利用数值方法研究了开有矩形大开孔的薄壁圆柱壳在轴压作用下的屈曲性能.首先通过特征值屈曲分析,得到开孔圆柱壳的一阶屈曲模态,并预测屈曲荷载的上限;其次,通过非线性分析,得到结构的荷载位移全过程响应;然后引入正交试验设计方法,分析了矩形开口的周向角度、高度和轴向位置等几何参数对结构稳定性的影响.分析表明,矩形开孔圆柱壳临界屈曲荷载的上限值远小于无开孔圆柱壳的下限值,影响矩形开孔圆柱壳轴压作用下稳定性的主要因素为壳体的径厚比,临界荷载值随径厚比的增大迅速下降.

英文摘要：

The buckling behavior of cylindrical shells with large rectangular opening was analyzed by the finite element method. Firstly, eigen value buckling was carried out to predict the buckling mode and critical load. Secondly, the load-displacement response of the structure was computed with geometrically nonlinear analysis, and the orthogonal design method was adopted to discuss the influence of geometric parameters on the buckling load. The considered parameters include opening width, opening height, location in the longitudinal direction, and radius-to-thickness ratio and height-to-diameter ratio of the shell. The result shows that the upper limit buckling load of a cylindrical shell with rectangular opening is much less than the lower limit value of a perfect cylindrical shell, and the buckling load of a cylindrical shell with rectangular opening is mainly dependent on the radius-to-thickness ratio of the shell. The critical load declines rapidly when the radius-to-thickness ratio of the shell increases.