Research On The Lightweight Composite Structure Inspired By The Toucan Beak And Its Mechanical Performance

Toucan beak,which is a composite sandwich structure,has the characteristics of light weight and high strength.The density of toucan beak,which has became the ideal bionic object,is only 0.1g/cm~3.In this paper,we take toucan beak as bionic object and design bionic single cell structure.Deep research on the mechanical properties of it is carried out.Definition based finite element method are selected to predict the equivalent mechanical properties of the single cell structure.The bionic single cell structure and the classic Gibson-Ashby foam model are built in 3D modeling software and analyzed by the finite element analysis software ANSYS Workbench in order to observe the effects of different loading condition.Result shows that the specific modulus and specific shear modulus of bionic single cell structure is much better than the classic Gibson-Ashby foam model structure.Parametric Design of bionic single cell structure and the optimal design based on the minimum mass,the minimum equivalent stress and the maximum restraint reaction is carried out.The optimal parameter of the sandwich structure is obtained,and the bionic sandwich plate beam structure is designed based on it.Two kinds of honeycomb sandwich structures commonly used in engineering practice are selected,and a honeycomb sandwich beam with better bending performance is selected as a comparative test sandwich sample by finite element analysis.The bionic sandwich plate beam structure is made up with SLS 3D print and the panel is made up from Epoxy-based carbon fiber panel.Structural glazing sealant are used to combine them.Mechanical Properties of three-point bending test are carried out to compare the bending performance of those two kinds of test samples.From the testing result we can find that in the condition of same porosity,the maximum load and bending modulus of bionic sandwich plate beam is better than that of honeycomb sandwich beam.