LDPM numerical analysis of hard projectile penetration in thick plain concrete target response
FENG Jun1,2LIWen-bin1XULei 3 CHENYu 1 CHENXi 4
1. National Key Laboratory of Transient Physics, Nanjing University of Science & Technology, Nanjing 210094, China;
2. School of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China;
3. College of Water Conservancy & Hydropower Engineering, Hohai University, Nanjing 210098, China;
4. Department of Artillery Reconnaissance, Nanjing Artillery Academy, Nanjing 211132, China
Based on a mesoscale discrete method titled Lattice Discrete Particle Model (LDPM), this work established a numerical simulation model for plain concrete thick target penetration. A brief introduction of LDPM basic assumptions and mesoscale constitutive laws was presented, which was followed by LDPM parameters calibration according to the hydrostatic compression and triaxial compression tests data. The proposed numerical model was validated for the concrete penetration problem in terms penetration depth and projectile deceleration curves during penetration process. With the calibrated LDPM parameters for 23 MPa strength concrete, this paper derived the penetration resistive force by conducting LDPM deep penetration simulations. Combining the Forrestal equation, the target static resistance was then obtained which indicates that either the CRH nor the penetration velocity hardly affects the target static resistance, meanwhile projectiles with 3 times, 6 times and 8 times maximum aggregate size suffer 260 MPa, 175 MPa, 163 MPa target static resistance.
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