芯材增强对夹层圆柱壳动力学性能影响的有限元分析

将表层、增强材料与芯材分开，应用有限元分析软件ANSYS，采用8节点SOLID45实体单元，对增强型夹层圆柱壳建立物理模型，进行自由振动及瞬态动力学过程分析。考虑树脂材性、尺寸以及分布等参数的变化，分析了点阵增强和齿槽增强对夹层圆柱壳动力学性能的影响，将两种增强方式进行了对比。结果显示，树脂柱及树脂齿槽均可改变圆柱壳的振动特性，对降低瞬态荷载下的动力响应有积极作用。其中树脂材性的影响较小，而点阵和齿槽的尺寸与分布对圆柱壳动力学性能的影响较为明显，分析显示，点阵增强对于提高结构固有频率比齿槽增强更好一些，而齿槽增强对于降低端部受冲击荷载时的动力位移比点阵增强更好一些。

Finite element analysis for reinforcement effects on dynamic behavior of composite cylindrical shells

Separating panel and resin form foam in core layer,a physical model was developed for elasticity analysis of a reinforced sandwich cylindrical shell by use of finite element software ANSYS.The SOLID45 element was used to simulate the free vibration and transient response of the shell.Considering materical properties,sizes and distributions of resin,the effect of resinic columns and notches on the dynamic property of the composite cylindrical shell were separtately studied.Comparison of the two reinforcements was also given.The results showed that both resinic columns and notches can affect the dynamic property of the sandwich cylindrical shell;there is an active effect on the displacement response of the cylindrical shell under a transient shock;the modulus influence of resin is small,while the effects of size and distribution of both resin lattice style and notch on the dynamic property of the composite cylindrical shell are obvious;notch reinforcement is better than resin lattice style in reducing the maximum displacemnt of the shell under transient shocks.