Study On Mechanical Properties Of Foam Aluminum Sandwich Plate Based On Equivalent Double Modulus

With the increasing of car ownership and fuel consumption,environmental protection has attracted more and more attention from all over the world.In the field of vehicle engineering research,how to find materials with high specific stiffness and light energy absorption based on the existing body structure is the key to energy saving and emission reduction of vehicles.The foam aluminum sandwich plate is a structure with foam aluminum as the core layer,and is attached to dense metal on both sides by adhesive and other connection techniques.As a kind of sandwich structure based on porous lightweight materials,it is widely used in aerospace,transportation and other engineering fields because of its high specific strength,good collision resistance,sound noise reduction and other characteristics.In this paper,the static dynamics of the foam core layer and its composite structure are studied by means of theoretical analysis,numerical simulation and mechanical test.On the basis of elastic mechanics theory,considering that the foam aluminum material and its composite structure exhibit obviously different tensile mechanical properties under external loading,a finite element model of the equivalent double modulus plywood of the foam aluminum sandwich plate is established.The results of modal simulation of single and equivalent two-modulus models are compared and compared with experimental data.The tensile mechanical test of the foam aluminum material was carried out by alignment with the static material mechanical tester.The main influencing factors of mechanical properties were studied by means of test method,and the expressions between the related parameters of closed foam aluminum were fitted.A double modulus equivalent model is established for the study of the three-point bending properties of the foam aluminum sandwich plate,and the elastic deformation results obtained by simulation are tested and verified.The influence of the relative density and tensile modulus ratio of the foam core layer on the bending properties of the sandwich plate was compared.The research results of this paper can be used in the use of roof,floor and partial bearing castings of commercial vehicles and passenger vehicles.On the basis of ensuring the same strength level of the original vehicles,the research results can provide the design department with lightweight safety body structure design ideas for weight reduction and energy absorption.