Analytical and Numerical Study on Anti-Perforation Performance of Steel-Liner-Concrete Composite Targets Subjected to Projectile Impact

Abstract

As an armor composite material, the damage mechanism, perforation resistance, damage evaluation and enhancement measures of steel-concrete are crucial to the protective design. In this paper, a modified prediction model of residual velocity and perforation resistance was proposed for the steel-liner-concrete composite target (SLCCT), which considered the fracture energy caused by steel liners and concrete. The numerical models were validated by comparing with previous penetration tests and the modified prediction model. Then LS-DYNA was used to analyze how the layer number (1–5) and rear-steel-liner layout influenced the projectile energy consumption, target damage and integral perforation resistance. The conclusions indicated that, when the reduction coefficient of fracture energy [Formula: see text] was taken as 0.1, the modified prediction model of residual velocity and perforation resistance for SLCCTs was firstly proposed and verified. Noteworthily, with regard to thin segmented SLCCTs (the ratio between layer thickness and projectile diameter was no more than 2.5), the structural perforation resistance was weakened with an increase of the layer number, where the ratio of residual and initial kinetic energy [Formula: see text] for five-layer target was approximately 17.9% higher than that of monolithic slab. Furthermore, as the ratio between layer thickness and projectile diameter was no more than 2, the perforation resistance provided by a rear steel liner was particularly prominent compared with each layer concrete in a SLCCT.