Study on dynamic and static mechanical properties of glass beads/epoxy resin composites

Glass bead buoyancy material is a two-phase composite material made of hollow glass bead (HGB) and epoxy resin. Glass bead has been widely used in building materials, navigation, aerospace and other fields because of its low density, high strength and low water absorption. Its static mechanical properties have been fully studied, but its dynamic mechanical properties are less studied, which are not enough to meet the needs of engineering applications. The compression, splitting and pseudo-triaxial compression experiments of HGB/epoxy resin composites under quasi-static/dynamic loading were carried out by INSTRON electronic universal testing machine and split Hopkinson pressure bar (SHPB). The results show that HGB/epoxy composite has strong strain rate sensitivity. The compressive strength and splitting resistance increase with the increase of strain rate, showing strain rate enhancement effect. The failure mode is also rate sensitive, and its brittleness increases with the increase of strain rate. Comparing uniaxial compression with pseudo triaxial compression, it is found that the compressive strength of the material under pseudo triaxial compression is higher than that under uniaxial compression.