| || Numerical Simulation of Projectile Impact on Mild Steel Armour Plates using LS-DYNA, Part II: Parametric Studies
Author : Raguraman, M.;Deb, A.;Gupta, N.K.;Kharat, D.K.
Source : Defence Science Journal ; Vol:58(4) ; 2008 ; pp 573-581
Subject : 620.1 Material Science and Technology;669 Metallurgy
Keywords : Simulation;LS-DYNA;Parametric study;Mild steel plate;Projectile;Ballistic limit;Numerical simulation;Modelling and simulation;Belytschko-Lin-Tsay shell;BLT shell;Residual velocity
Abstract : In Part I of the current two-part series, a comprehensive simulation-based study of impact of jacketed projectiles on mild steel armour plates has been presented. Using the modelling procedures developed in Part I, a number of parametric studies have been carried out for the same mild steel plates considered in Part I and reported here in Part II. The current investigation includes determination of ballistic limits of a given target plate for different projectile diameters and impact velocities, and effects of plate thickness and projectile parameters such as mass, diameter and nose shape on residual velocity. In all cases studied, trends consistent with earlier experimentally-observed behaviours for similar impact problems have been found, thereby establishing the potential of the present simulation technique using LS-DYNA as a powerful tool for the design of steel armour plates.
| || Numerical Simulation of Projectile Impact on Mild Steel Armour Plates using LS-DYNA: Part I: Validation
Author : Deb, A.;Raguraman, M.;Gupta, N. K.;Madhu, V.
Source : Defence Science Journal ; Vol:58(3) ; 2008 ; pp 422-432
Subject : 669 Metallurgy;66 Chemical Technology
Keywords : Projectile;Mild steel plate;Ballistic impact;Simulation;LS-DYNA
Abstract : The paper describes the simulation of impact of jacketed projectiles on steel armour plates using explicit finite element analysis as implemented in LS-DYNA. Validation of numerical modelling includes a comprehensive mesh convergence study leading to insights not previously reported in literature, using shell, solid, and axisymmetric elements for representing target plates. It is shown for a number of cases that with a proper choice of contact algorithm, element size, and strain rate-dependent material properties, computed projectile residual velocities can match closely with corresponding test-based values. The modelling requirements are arrived at by correlating against published test residual velocities1 for variants of mild steel plates (designated as MS1, MS2 and MS3) of different thicknesses at impact velocities in the range of ~820-870 m/s. Using the validated numerical procedure, a number of parametric studies such as the effect of projectile shape and geometric aspect ratios as well as plate thickness on residual velocity have been carried out and presented in Part II of the current paper.