AN EMPIRICAL-EQUATION FOR PENETRATION DEPTH OF OGIVE-NOSE PROJECTILESINTO CONCRETE TARGETS

We conducted depth of penetration experiments with ogive-nose projecti les and concrete targets with unconfined compressive strengths of nomi nally 14 MPa (2 ksi), 35 MPa (5 ksi), and 97 MPa (14 ksi). From our da ta and the data presented by Canfield and Clator [J. A. CANFIELD and I . G. CLATOR, Development of a scaling law and techniques to investigat e penetration in concrete. NWL Report No. 2057, U.S. Naval Weapons Lab oratory, Dahlgren, VA (1966)] [1], we developed an empirical equation for penetration depth of ogive-nose projectiles penetrating concrete t argets at normal impact. Our penetration equation contains a single, d imensionless empirical constant that depends only on the unconfined co mpressive strength of the target. We determine the empirical constant from penetration depth versus striking velocity data with six sets of penetration data for striking velocities between 250 and 800 m/s. Pred ictions are in good agreement with all six data sets.