COMPUTER SIMULATION PROFILES AND VELOCITY DECAYING RATES OF EXPLOSIVELY FORMED PROJECTILES
Numerical simulations are carried out using Autodyn 2D hydrocode to study effects of liners materials on the shape, profiles of velocity, time, pressure, temperature, yield stress, density, compression, total energy, internal energy, kinetic energy and momentum of EFPs. The materials chosen for liner are tantalum, copper, mild steel, armco iron and aluminium. The velocity attenuation laws show that tantalum as liner material has least maximum and stable velocity whereas these values are highest for aluminum as liner. This difference is due to the explicit density gradients of the liner materials. The time required to get stable velocity is directly proportional to the liners material density and the velocity decaying rate of liner material is inversely proportional to its density. In case of low density material the velocity attenuates faster to the stable value from maximum velocity, so A1 has highest velocity decaying rate or deceleration to get its stable velocity whereas Ta has lowest velocity decaying rate or deceleration to get its stable velocity. Other material parameters also have infinitesimal effects on the velocity decaying rates. In case of armco iron and mild steel, although same value of density for both materials is used in the simulation but their decelerations are different from each others. The gradient valued-profiles for velocity, pressure, yield stress, density, temperature, compression and internal energy for liner materials mild steel, copper, armco iron, tantalum and aluminum are observed and show one thing common in them, that is maximum value in the central portion of EFPs leading to reduced values at the edges. Profilic graphs also show higher momentum for tantalum and copper than other materials whereas total energy of mild steel, armco iron and aluminuM is elevated due to higher density they carry.
Ghulam Hussain Khairuddin Sanaullah
School of Chemical & Materials Engineering (SCME), National University of Sciences & Technology (NUST), H-12, Islamabad, Pakistan
国际会议
25th International Symposium on Ballistics(第25届国际弹道会议)
北京
英文
714-727
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）