A systematic mechanical test on UHPC properties used to calibrate Kong-Fang model's parameters under projectile penetration and charge explosion

Abstract

Ultra-high performance concrete (UHPC) is an outstanding material used in defense engineering that may be suffered from deliberate projectile penetration and charge explosion. Numerical simulation plays an increasingly significant role for analyzing corresponding failure mechanism with the aid of a well sound material model along with calibrated parameters. However, a systematic mechanical test on UHPC properties especial the flyer-plate-impact test used to calibrate parameters is very limited. To resolve this problem, static and dynamic mechanical property tests on UHPC specimens were firstly performed, which were then employed to calibrate the parameters for strength surface, equation of state, damage and strain-rate effect in the Kong-Fang model recently proposed. Based on the calibrated parameters, projectile penetration test and charge explosion test on UHPC targets were numerically simulated and compared with relevant test data. Numerical predictions and comparisons demonstrated the effectiveness of calibrated parameters. The present study can provide fundamental data to calibrate a material model used to numerically simulate failures and dynamic responses of UHPC structures suffered from impact and blast loadings.