基于三维模型的蜂窝材料有效弹性性能研究

采用三维模型预测了传统六角形蜂窝材料和带圆环结点六角形蜂窝材料的有效弹性性能.利用有限元法并结合周期边界条件计算了材料代表性体积单元的平均应力,进而由平均场理论获得了两种蜂窝材料全部的有效弹性常数.将传统蜂窝材料的计算结果与已有梁模型的计算结果和试验数据进行了对比,结果表明三维模型比梁模型具有更高的精度,分析了梁模型误...

Investigation on Effective Elastic Properties of Honeycomb Materials Using Three-dimensional Model

Effective elastic properties of conventional hexagonal honeycomb and the hexagonal honeycomb with circular joints are investigated by use of three-dimensional models. Average stresses in the representative volume element of the honeycomb materials are obtained by employing the finite element analysis combined with periodical boundary condition, and then all the effective elastic constants are derived from the average-field theory. Comparisons of the present conventional hexagonal honeycomb results with the existing results derived from beam model and test data show that three-dimensional model have higher accuracy compared with beam model, causes of errors of beam model are discussed. In-plane stiffness of the hexagonal honeycomb with circular joints can be improved dramatically by adjusting the ratio of the wall thickness of the circular joint to the honeycomb wall thickness under fixed relative density.