Preparation And Mechanical Properties Of Graphene-reinforced Polyurethane Matrix Composites

Polyurethane elastomer has many advantages,such as good energy absorption,strong designability,corrosion resistance,and large application range.Moreover,the density of polyurethane is low,only about 1g/cm3,and the price is low.Based on the above advantages,polyurethane elastomer materials can be widely used in various fields,so they have received general attention from researchers.This paper aims to improve the tensile strength and impact properties of polyurethane composites,and prepare graphene-reinforced polyurethane-based composites to study their mechanical response characteristics under dynamic loads.The main research work of this paper is as follows:(1)Polyurethane elastomers,graphene-reinforced polyurethane elastomers and graphene-reinforced polyurethane particle ceramic inclusion composites were prepared,and the quasi-static mechanical properties of the materials were tested.The results showed that graphene,as a reinforcing phase,could significantly improve the tensile strength and elastic modulus of polyurethane elastomers.(2)Dynamic compression experiments were carried out on graphene-reinforced polyurethane elastomers at different strain rates(2350/s,3500/s and 4200/s)to study the dynamic mechanical response of graphene-reinforced polyurethane elastomers at different strain rates.ZWT constitutive model was built and improved based on the experimental data.(3)Dynamic compression experiments of graphene-reinforced polyurethane particle ceramic inclusion composites under high strain rate were carried out to study the strain rate effect and deformation mechanism.The results show that graphene-enhanced polyurethane particle ceramic inclusion composites can significantly increase the compressive strength of polyurethane elastomer.(4)A numerical simulation model for dynamic confining pressure of graphene-enhanced polyurethane-based particle-ceramic inclusion composites was established.Through comparison with experiments,the reliability of the simulation method was verified.The mechanical response and failure process are discussed,and the effects of different particle sizes of ceramic particles on the properties of graphene-reinforced polyurethane-based particle-ceramic inclusion composites are discussed.The results show that the particle size of the granular ceramic is closely related to the compressive strength of the graphene-reinforced polyurethane-based granular ceramic inclusion composite.