Void ratio based representative volume element for modelling the high strain rate behaviour of granular materials

摘要: Abstract The ability to model impact and penetration behaviour of granular materials – such as sand largely depends on the understanding stress–strain volume change characteristics at high strain rates. Split Hopkinson Pressure Bar has been used extensively in past evaluate rate dependent constitutive response a wide range advanced natural materials. However, deformation geo-materials including media needs careful interpretation order provide data for calibration validation numerical models. In this paper, new procedure determination smallest Representative Volume Element (RVE) is proposed. relies upon simulations consolidated assembly using Discrete Method (DEM). Results indicate role void ratio an important state variable, which influences dynamic mechanical performance considerably. existence lower limit dimensions specimens high-strain experiments function their consolidation demonstrated. adoption RVE specimen size allows time achieving equilibrium that essential reliable characterisation or particulate Using concept RVE, experimental results are generated, demonstrating success our proposed methodology. identified will favourably next generation predictive modelling tools problems