圆截面空间曲杆的屈曲

来源 :南京航空航天大学学报(英文版) | 被引量 : 0次 | 上传用户:syblanseyouyu
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采用自然坐标系对空间曲杆进行有限元建模,给出了自然坐标系下的三维细长空间曲杆的格林应变计算公式和能量方程,建立了2节点12个自由度的三维曲梁单元并用其分析了同时受轴向力和轴向扭矩作用的具有初始曲率和挠率的三维空间曲杆的屈曲问题.算例证明了公式和方程的正确性和合理性.数值结果与现有的理论解相吻合,收敛性却比商用有限元软件的结果好.数值结果还表明,扭矩对屈曲的影响不可不计.
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