Dynamic Mechanical Properties and Constitutive Model of Honeycomb Paperboard Filled with Polyurethane

A kind of composite buffering material was made by filling the voids of honeycomb paperboard with polyurethane.Drop tests were performed to evaluate the dynamic mechanical properties of the material.Based on the experimental results,the mechanical behavior of the material was analyzed through influencing factors including honeycomb core diameter,thickness,cross-section area and impact velocity.It is shown that the dynamic yield strength and elastic limit increase with the increase of impact velocity,and decrease with the increase of honeycomb core diameter,thickness and cross-section area.Then the dynamic constitutive model is established.It is proved that the curves of constitutive model fit well with those of experimental data.