Mesoscale Equivalent Numerical Study of Ultra-High Performance Concrete Subjected to Projectile Impact

Numerical investigations on the performance of ultra-high concrete (UHPC) subjected to projectile impacts have attracted extensive attention, but there are still deficiencies in accuracy and computational efficiency related simulation methods. To make up for these deficiencies, a mesoscale equivalent model UHPC is developed simulate response under impacts. In this model, an treatment conducted steel fibers reduce their quantity premise that interfacial shearing force between matrix remains equal. Based numerical simulations uniaxial compressive tests penetration specimens performed LS-DYNA, results compared with corresponding experimental verify model. It found could accurately reproduce failure mode stress-strain curve when amplification factor lower than 5. When 5, models significantly improved, maximum relative error crater diameter depth 11.7%. The successful application provides more precise in-depth perspective simulating impact. Then, influence striking velocities, strengths, volume percentages (DOP) further numerically assessed. simulated data, modifications Young equation predicting DOP conducted, modified 13.9%. This demonstrates can predict