聚氨酯弹性体隔板夹层结构的等效参数计算

Equivalent parameters calculation for sandwich plate with polyurethane elastomer core reinforced by crossing walls

针对聚氨酯弹性体的隔板夹层结构,阐述了多种不同的等效参数计算方法,并对等效参数进行计算。首先讨论和计算了不考虑结构剪切变形时的整体结构等效参数计算方法,将整体夹层结构等效为正交各向异性薄板,给出了考虑夹芯抗弯刚度的整体刚度系数表达式。其次,在考虑夹层结构夹芯存在剪切变形的情况下,推导了由分隔隔板和聚氨酯弹性体组成的夹芯胞元的等效弹性常数;最后,使用基于应变能密度等效分析的有限元方法对夹芯胞元等效弹性常数进行计算,并与理论分析结果进行对比,二者误差在10%以内。

A series of equivalent simplified methods were investigated in this paper and equivalent parameters were calculated for sandwich plate with polyurethane elastomer core reinforced by crossing walls.Firstly,aglobal equivalent method was discussed in case of ignoring the shear deformation of the core.In this way,the reinforced structure could be made equivalence to orthotropic thin plate and stiffness coefficients equations were presented.Secondly,when considering shear deformation of the core,equivalent elastic coefficients of the core compounded by crossing walls and polyurethane elastomers were also given by theoretical derivation.Finally,the equivalent orthotropic modules for the polyurethane core with crossing walls were analyzed by finite element method（FEM）based on equivalent strain energy density.And the results show that the error between theoretical derivation and FEM is less than 10%.