Abstract
Study of penetration resistance of combinations of different types of materials has important application in design of body armours, vehicle armours, protection from landmines, etc. We report the development of indigenous Material Point Method (MPM3D) and Smoothed Particle Hydrodynamics (SPH3D) codes along with appropriate material strength and failure models and their validation against published results for different impact velocities. Mie-Gruneisen equation of state, Johnson-Cook strength and Johnson-Cook failure models are used for metals. Johnson-Holmquist model is used for ceramics. Comparison and strengths of these codes are discussed. Simulations are also performed independently for indigenous experiments to study the ballistic limit of three targets, viz. (i) Al-6061 plate (ii) Ceramic plate (iii) Ceramic backed by Al, upon impact by a flat nosed steel-4340 projectile accelerated to desired velocities using an electromagnetic coil gun. The residual velocities for given impact velocities are compared. Simulations carried out using commercial FEM software are also reported. The simulation and experimental results agree very well within 3%. Ballistic limit enhances greatly when ceramic plate is used along with Al plate.
Published Version
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