| || Adaptive finite element analysis of plastic deformation of plates under projectile impact
Author : Prakash, T.;Sekhon , G. S.;Gupta, N. K.
Source : Defence Science Journal ; Vol:53(1) ; 2003 ; pp 57-65
Subject : 620.1 Material Science and Technology
Keywords : Finite element analysis;Aluminium plates;Projectile impact ;Closed form solutions;Plasticity;Metal plates;Flow formulation;Plastic deformation
Abstract : "This paper deals with the finite-element analysis of plastic deformation of plates during normal impact of projectile on plates, The finite element method implemented here is based on the flow formulation of plasticity. During projectile impact the geometrical configuration of domain is progressively altered that generally causes distortion of mesh. It affects the accuracy of finite-element solution, Hence, a posteriori error estimation for the computed finite-element solution has been incorporated to capture the zones of high stress and strain gradients. The h-refinement of the mesh is carried out over such domain to limit the solution error, Two projectile impact problems on a circular aluminium plate-one by a blunt-end projectile and another by a hemi-spherical-headed projectile-are analysed to illustrate the proposed method. "
| || Oblique impact of projectile on thin aluminium plates
Author : Khan, W. U.;Gupta, N. K. ;Ansari, R.
Source : Defence Science Journal ; Vol:53(2) ; 2003 ; pp 139-145
Subject : 620.1 Material Science and Technology;623.4 Armaments and Ballistics;531.55 Projectiles
Keywords : Oblique impact;Impact velocity;Projectiles;Ballistic limit;Residual velocity;Plates;Aluminium plates;Analytical model;Projectile velocity
Abstract : "Experiments were performed, wherein cylindrical projectiles made of hardened steel were impacted on commercially available aluminium plates at different angles. Projectiles were of 12.8 mm diameter and plates were of 0.81 mm, 1.52mm and 1.91mm thicknesses. Based on the experimental results, an analytical model has been developed to predict the residual velocity of the projectile and the ballistic limit of the plate. "