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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.
The buckling behavior of thin-walled cylindrical shells with large rectangular openings under axial compression was studied by using numerical methods. First, the first-order buckling modes of cylindrical shells with open-bores were obtained by eigenvalue buckling analysis and the upper bound of buckling load was predicted Secondly, through the nonlinear analysis, the entire process of displacement response of the structure is obtained. Then the orthogonal experimental design method is introduced to analyze the influence of geometric parameters such as the circumferential angle, height and axial position of the rectangular opening on the structural stability. The results show that the upper critical value of the critical buckling load of a rectangular perforated cylindrical shell is much smaller than the lower limit of a non-perforated cylindrical shell. The main factors affecting the stability under the axial compression of a rectangular perforated cylindrical shell are the ratio of shell diameter to thickness, The load value decreased rapidly with the increase of radius-to-thickness ratio.