Abstract：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.
2022, Vol. 43 
