Numerical Analysis And Experimental Study Of Two Kinds Of Honeycomb Structures With Negative Poisson’s Ratio

Honeycomb sandwich structure is a special layered composite material which has many advantages over traditional materials such as light weight, high specific strength, high designability that it is widely applied in areas such as aeronautics and astronautics, shipping, national defense.Honeycomb structure’s Poisson’s ration is normally positive macroscopically. However, with the constant research and incessant development of materials of negative Poisson’s ratio, more and more honeycomb structure of such negative Poisson’s ratio effect has been designed. To meet the demands of modern engineering technology, it is of great significance to conduct research relevant to novel honeycomb topological structure of negative Poisson’s ratio.This dissertation introduced the development and application of honeycomb structure and materials of negative Poisson’s ratio and the current state of the research on honeycomb structure of negative Poisson’s ratio home and abroad. Due to the fact that it is difficult to theoretically research the star-shaped and arrow-shaped honeycomb structure because of the specialness in their representation volume element,this dissertation used ANSYS numerical simulation and mechanic experimentation to conduct research and analysis on the mechanic property of the two aforementioned structures. The star-shaped and arrow-shaped honeycomb structure’s elasticity modulus and Poisson’s ratio was calculated and predicted using ANSYS which was then followed by two more simulations: stretching simulation to test each structure’s overall tensile effect and bending simulation to prove that horizontal curvature and main curvature are consistent and that synclastic curvature and double curvature arises when out-of-plane bending moment is acted upon material of negative Poisson’s ratio.These two topological structures’ geometrical models were further built in Solidworks which were then printed out via 3D printing technology taking the place of traditional manufacturing process.The printed structures were later processed using laser cutter to build star-shaped and arrow-shaped honeycomb structures. Using non-contact full-strain measurement system VIC-3D to measure the transverse direction and the sideway direction of the displament of the structure during the tensile test. Finally, mechanic experiment on those structures were conducted and with the comparison of the experiment result and finite element results.Discuss the star-shaped and arrow-shaped honeycomb structure’ mechanical property, Providing a reference for the future research.