Computational modeling of the penetration of projectiles with hard steel cores having hardness values between Rc 60-Rc 63 is presented. Commercially available tool steel is heat treated to a hardness of Rc 62 and its high strain-rate properties in compression and tension are characterized using the split Hopkinson bar. Bar impact experiments are also performed to measure the compressive strength. Material response is determined to be brittle in tension and ductile in compression. Measured compression and tensile strength values were used to develop a failure model for the material and incorporated into EPIC, a Lagrangian finite element code. The code is then used to perform computations of penetration of hard steel projectiles and multi component projectiles, such as the APM2, against metal and metal/ceramic targets. The computations are found to be in excellent agreement with ballistic test results.
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