Graded negative Poisson’s ratio honeycomb structure design and application

A sub-domain size optimization method is conducted to design degraded negative Poisson’s ratio honeycomb structures, which could fully utilize the material behavior, such as minimum weight, maximum stiffness and maximum strength etc. The flexural stiffness of negative Poisson’s ratio honeycomb structure is greatly associated with the geometry size, which are obtained by geometry size parameter analysis from the representative volume cell of negative Poisson’s ratio honeycomb sandwich structure. A three-point bending specimen is designed by sub-domain size optimization method, which is verified by bending experiments. The optimal three-point bending specimen with graded negative Poisson’s ratio honeycomb core have the largest bearing capacities and relatively lower weight. The variable thickness wing structure with graded negative Poisson’s ratio honeycomb core is also designed by using the sub-domain size optimization method.