PENETRATION OF GROUT AND CONCRETE TARGETS WITH OGIVE-NOSE STEEL PROJECTILES

We conducted depth of penetration experiments into grout and concrete targets with ogive-nose steel projectiles. Powder guns launched 0.064 kg, 12.9 mm diameter projectiles into grout targets with unconfined co mpressive strengths of 13.5 MPa (2.0 ksi) and 21.6 MPa (3.1 ksi). For the concrete targets, powder guns launched projectiles with length-to- diameter ratios of 10; a 0.48 kg, 20.3 mm diameter rod, and a 1.60 kg, 30.5 mm diameter rod. Concrete targets had unconfined compressive str ength of 62.8 MPa (9.1 ksi)for the 0.48 kg rods and unconfined compres sive strength of 51.0 MPa (7.4 ksi)for the 1.60 kg rods. For these exp eriments, penetration depth increased as striking velocity increased u ntil nose erosion became excessive. Thus, we determined experimentally the striking velocities corresponding to maximum penetration depths. Predictions from a previously published model are in good agreement wi th data until nose erosion becomes excessive. Copyright (C) 1996 Elsev ier Science Ltd.