约束状态对纤维缠绕复合材料圆柱网格结构稳定性的影响

摘要

利用有限元法对纤维缠绕复合材料圆柱网格结构的稳定性进行了分析,结合ANSYS二次开发语言APDL (ANSYS Parametric Design Language)编写了圆柱网格结构优化设计程序.利用该程序研究了底部固定,顶部自由或径向固定两种约束状态下,网格结构载荷质量比随缠绕角度、筋截面高宽比、环筋条数以及纵筋对数等设计参数的变化规律.理论研究结果表明:当设计参数在一定范围内变化时,约束状态的变化对网格结构的稳定性有显著影响.最后,对一定尺寸的网格结构进行了轴压实验,实验结果表明:利用有限元方法可以有效预测复合材料网格结构的稳定性并进行优化设计.%Stability of fiber winding composites circular lattice structure was analyzed using finite element method. Optimal design program of circular lattice structure was compiled using APDL (ANS YS Parametric Design Language) of ANSYS. Under two kinds of constraint status , free end and radial fixed end , changing law of load-to-mass ratio which is attached to winding angle, aspect ratio, number of loop stiffener and couples of helical stiffener has been researched utilizing the optimal design program. As a result of theoretical research, change of constraint status has obvious influence on stability of circular lattice structure when design parameters vary in some range. At last, the composites lattice structure of a certain size was carried on an axial compression experiment. As a result, stability of composites lattice structure can be efficiently forecasted with FEM(finite element method), and optimal design can be efficiently carried.