Depth of penetration of steel‑tube‑confined concrete targets based on dynamic finite cylindrical cavity‑expansion models

摘要

Steel-tube-confined concrete (STCC) targets show excellent anti-penetration performance as a result of confinementeffect of steel tube on in-filled concrete. A dynamic finite cylindrical cavity-expansion (FCCE) model with elastic radialspring was developed to analyze the confinement effect and predict the depth of penetration (DOP) of STCC targetsnormally penetrated by rigid sharp-nosed projectiles. Firstly, steady responses of the dynamic FCCE approximation modelwere obtained on the basis of the assumption of incompressibility of target concrete and failure of comminuted zonewith the Heok–Brown criterion. Then, based on the dynamic FCCE approximation model, a DOP model for STCC targetsimpacted by rigid projectiles was proposed. Lastly, the penetration tests of STCC targets normally penetrated by 12.7 mmarmor piecing projectile (APP) were taken as examples to validate the applicability of the dynamic FCCE approximationmodel and DOP model. The results show that in comparisons with the results based on the dynamic spherical cavityexpansion(FSCE) model, the DOP model based on the dynamic FCCE model in this paper is more applicable to predictthe DOP of STCC targets penetrated by rigid conical or other sharp-nosed projectiles with a proper value of empiricalconstant m in the Heok–Brown criterion.