Study On Mechanical Properties Of Honeycomb Materials With Circular Nodes

Honeycomb materials with high specific strength,specific stiffness and excellent energy absorption capacity have been widely used in many fields and attract the attention of many scholars.In this paper,the effective elastic properties and impact dynamics of hexagonal honeycomb materials with circular nodes are investigated using both beam/shell model and three-dimensional model.The main studies are as follows:(1)The effective in-plane elastic constants of the conventional hexagonal honeycomb were predicted using a three-dimensional model and compared with the beam model results and the experimental results.The reasons for the differences between the two models were analyzed,and it was demonstrated that the three-dimensional model was closer to the experimental results than the beam model.(2)For the circular nodal honeycomb,the beam model was used and the theoretical solutions of the in-plane elastic modulus and Poisson’s ratio were derived.A threedimensional model with representative cells was used as the calculation object,and the numerical solutions of all effective elastic constants were given by using the finite element software ANSYS and combining the periodic boundary conditions and mean field theory.The differences between the calculated results of the two models were compared,and the effects of different ratios of nodal circle radius to honeycomb edge length and nodal wall thickness to honeycomb wall thickness on the effective elastic properties of the material were discussed under the premise of constant relative density.(3)For the circular nodal honeycomb,a shell model and a three-dimensional model were built and simulated by the finite element software ABAQUS for in-plane impact dynamics,and the differences in deformation patterns,platform stresses and specific energy absorption between the two models were compared.The effects of impact velocity,the ratio of nodal circle radius to honeycomb edge length and nodal wall thickness to honeycomb wall thickness on the impact properties of the material were discussed with constant relative density.The results of this paper can provide valuable references for the lightweight design and performance optimization of honeycomb materials.