Indian Journal of Science and Technology

Abstract

Objectives: Numerical investigations were carried out on 1mm thick aluminum plates against ogive-nosed steel projectiles of 15mm diameter and 55g mass. The finite element code ABAQUS was used to perform Three-dimensional and twodimensional axisymmetric numerical simulations for the conducted experiment. Methods: The ABAQUS/Explicit finite element code in conjunction with a elasto-viscoplastic material model employed by Johnson-Cook model was used to perform the simulation study. The material model takes in various factors: yielding, linear thermo-elasticity, strain rate hardening, softening due to adiabatic heating, plastic flow, fracture effects and isotropic strain hardening. Both the rigid and deformable projectiles were considered to study their influence on the failure mechanism. Findings: The numerical results thus obtained, when compared with the available experimental results are found to be similar at high incidence velocities. However, at low incidence velocities the numerical results are found to be under predicted. Almost same ballistic resistance was offered by the target plate irrespective of the rigidity of projectile. The residual velocities of aluminum targets obtained using 2D and 3D deformable and rigid projectile curves became almost thesame. Improvements: Based on these studies, the influence of deformable projectile on thin targets was not significant but the energy absorption by the projectile on thick target is to be studied further. 
Keywords: 2D and 3D Analysis, Failure Mechanism, Rigid and Deformable Projectile