Triaxial compressive behavior of UHPCC and applications in the projectile impact analyses

Abstract

For the constructions of protective structures against potential projectile high-speed impact, the optimal ultra-high performance cement based composite (UHPCC) (straight steel fiber with the volumetric ratio of 2%, high-strength basalt aggregates with the size range of 5-10mm, the designed uniaxial compressive strength of∼100MPa) was prepared. By casting two batches of 50mm×100mm cylindrical UHPCC specimens with the uniaxial compressive strengths of 95MPa and 129MPa, the triaxial compressive behavior of UHPCC under high confining pressure (up to 100MPa) was experimentally studied. Based on the deviatoric stress-strain curves under various confining pressure, the failure criteria and toughness of UHPCC under triaxial compression were discussed. At last, the dominant strength parameters of Holmquist-Johnson-Cook constitutive model were confirmed based on the present and existing triaxial compression tests on high-strength concrete. The validity of which was verified based on eleven sets of projectile penetration or perforation tests on concrete-like targets with the uniaxial compressive strength ranged from 60MPa to 157MPa.