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针对含开口薄壁杆件的大型空间柔性结构热屈曲问题,发展了一种包含翘曲自由度的二节点开口薄壁杆单元。该单元考虑了约束扭转与弯扭耦合效应,同时考虑了热应力对几何刚度阵的影响,可进行空间杆系结构的热屈曲分析。简单梁模型算例表明:该方法求得的各阶屈曲温度临界值和屈曲模态与AN SY S薄壳有限元解吻合较好;并且由于考虑了开口薄壁杆的特性,热首先引起杆件的弯扭耦合屈曲。对哈勃太空望远镜太阳帆板的简化模型进行了热屈曲分析,成功地解释了热使该太阳帆板发生扭转屈曲的原因。
Aiming at the thermal buckling problem of flexible large-scale structures with open thin-walled members, a two-node open thin-walled pole element with warp degree of freedom is developed. The element considers the coupling effect between restraint torsion and bending and torsion, and considers the influence of thermal stress on the geometrical stiffness matrix, and can perform the thermal buckling analysis of the space bar structure. The simple beam model shows that the critical buckling temperature and the buckling mode obtained by this method agree well with ANSYS shell finite element method. And considering the characteristics of open thin-walled rod, Flexure-torsion coupling buckling. A thermal buckling analysis of a simplified model of the solar panel of the Hubble Space Telescope has successfully explained the causes of the torsional buckling of the solar panel by heat.