Study On Mechanical Properties Of Hollow Glass Microspheres/Epoxy Syntactic Foams With Interface

Hollow glass microspheres/epoxy syntactic foams is a kind of light weight,high strength and multi-functional material with strong operability and design.It has been widely used in marine development,aviation,aerospace and other fields.In order to meet the development needs of new industry and advanced science and technology,it is very important to study its mechanical properties accurately.In this paper,the mechanical properties and influencing factors of the composites were discussed by establishing representative volume element models and simulating analysis.Using APDL parametric programming of AYSYS,a cubic periodic cell model with random distribution of microspheres based on RSA method is generated.The cohesive element is used to model the behavior of interfaces in composites.The periodic boundary conditions and displacement loads are applied for simulation.The two cases of glass microspheres and matrix connect ideally and connect with interface were compared with the experimental data,the feasibility is verified.The effect of interface area on the properties of materials was also studied.The elastic-plastic mechanical properties of syntactic foams were analyzed.The stress-strain curves,yield strength and stress distribution of the model were obtained under different parameters,taking into account the influence of glass microsphere on relative wall thickness and volume fraction.The effect of interfacial bonding strength on the material was studied by combining different interfacial bonding conditions to simulate the actual situation.The mechanical properties of syntactic foams were also studied when the fibers were arranged neatly.A simplified model for uniform arrangement of fibre beads was established.The elastic modulus of the material model,the interaction between microspheres and fibers and their effects on properties of the material were analyzed.