摘要
针对航天工程中常用的承受轴压作用的薄壁圆柱壳,分别采用解析方法与特征值屈曲有限元方法分析了圆柱壳结构在均匀轴压作用下的稳定性能,得到了屈曲承载力,并进行了对比,验证了有限元模型的合理性。采用线性屈曲特征值有限元方法分析了强激光辐照作用下圆柱壳的稳定性能,分析表明激光辐照导致壳体局部温度上升并由此带来材料参数的改变,是因为激光辐照在壳体中引起了热应力与热应变,使轴压圆柱壳的屈曲承载力明显降低。论文还着重对加筋圆柱壳结构的稳定性进行了研究,数值分析结果表明,加筋能有效提高圆柱壳结构的抗压承载力,激光辐照作用下,加筋对轴压作用下圆柱壳的屈曲承载力的提高作用更为明显。
Considering compressed thin wall cylindrical shell structures widely used in aerospace engineering,analytic method and eigenvalue buckling finite element method are applied in the paper to analyze the stability of cylindrical shell structure under uniform axial compression,and the critical buckling loads respectively are obtained and contrasted to conclude that the finite element model is reasonable.Linear buckling eigenvalue finite element method is also employed to analyze the stability of cylindrical shell irradiated by intensive laser beam,and the analysis results investigate that laser irradiation brings on high temperature of local shell structure and subsequently changes of material parameter,because laser irradiation leads to thermal stress and thermal strain,and makes the buckling load of compressed cylindrical shell come down drastically.The stability of stiffened cylindrical shell structure is focused to be studied as well,and numerical analysis results indicate that stiffeners are valid to improve the capability of compressed shell and more effective under combined function of axial compression and laser irradiation.
出处
《计算力学学报》
CAS
CSCD
北大核心
2008年第S1期124-128,共5页
Chinese Journal of Computational Mechanics
基金
天津市工程力学重点实验室资助
关键词
激光辐照
稳定性
屈曲载荷
加筋圆柱壳
laser irradiation
stability
buckling load
stiffened cylindrical shell
