Topic
Projectile
About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.
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TL;DR: In this article, three-dimensional numerical simulations were carried out to study the ballistic resistance of ductile targets subjected to normal impact by the projectiles, and the internal nose angle of conical and ogive nosed projectiles was varied (33.4°-180°).
Abstract: Three-dimensional numerical simulations were carried out to study the ballistic resistance of ductile targets subjected to normal impact by the projectiles. 12 mm thick Weldox 460 E steel targets were impacted by 20 mm diameter conical nosed projectiles and 1 mm thick 1100-H12 aluminum targets were impacted by 19 mm diameter ogive nosed projectiles. The internal nose angle of conical projectile was varied (33.4°–180°) and found to have significant effect on the ballistic limit of 12 mm thick Weldox 460 E steel target. Similarly, the caliber radius head (CRH) of ogive nosed projectile was varied (0–2.5) and found to have significant effect on the ballistic limit of 1 mm thick 1100-H12 aluminum target. The ballistic limit of 12 mm thick Weldox 460 E steel target increased almost linearly with the decrease in the projectile nose angle. While the ballistic limit of 1 mm thick 1100-H12 aluminum target increased as the CRH increased from 0 to 0.5 and with further increase in CRH to 1.0, 1.5, 2.0 and 2.5 its values were found to drop quite significantly. ABAQUS/Explicit finite element code was used to carry out the numerical simulations.
43 citations
TL;DR: The magnetoflyer method has been developed as a convenient and fiducial technique for measuring projectile velocities from propellent and gas guns as discussed by the authors, which is estimated from the time interval between two electromotive force signals when the projectile, which includes a small ferrite magnet, passes through two pick up coils.
Abstract: The magnetoflyer method has been developed as a convenient and fiducial technique for measuring projectile velocities from propellent and gas guns. The velocity is estimated from the time interval between two electromotive force signals when the projectile, which includes a small ferrite magnet, passes through two pick‐up coils. It was confirmed that the method was available up to 5 mm/μs.
43 citations
Patent•
30 Aug 1995TL;DR: In this article, a pneumatic reservoir is coupled to a longitudinal bore of a barrel and a rupture disk is attached to the first end of the barrel to form a seal between the longitudinal bore and the chamber, and a gas is introduced into the chamber until a sufficient pressure is attained within the chamber to rupture the disk.
Abstract: A projectile substance is pneumatically propelled. The projectile substance is inserted onto a longitudinal bore of a barrel and a rupture disk is attached to a first end of the barrel. Next, the first end of the barrel is coupled to a first end of a pneumatic reservoir having a chamber therein. The rupture disk, as attached, acts to form a seal between the longitudinal bore and the chamber. Then, a gas is introduced into the chamber until a sufficient pressure is attained within the chamber to rupture the disk. When the disk ruptures, the gas in the chamber rushes into the longitudinal bore with sufficient force to propel the projectile substance out of the barrel. One or more pistons may be slidably disposed within the chamber to form more than one chamber portion. An average pressure for propelling the projectile substance may be increased by various methods of forcing the piston(s) toward the projectile substance as it is being driven out of the barrel. Additionally, if more than one piston, for example two pistons, are provided, the pistons may have different end surface areas to create a pressure multiplication effect. Accordingly, the pressure available for propelling the projectile substance can be greater than the source pressure. Also, rupture pressure in the chamber can be achieved by heating a liquid in the chamber.
43 citations
TL;DR: In this article, a three-dimensional model was developed in the finite element solver ABAQUS/Explicit, which combines Lagrangian elements with Smoothed Particle Hydrodynamics elements.
Abstract: This paper focuses on the mechanical behaviour of aluminium alloy 2024-T351 under impact loading. This study has been carried out combining experimental and numerical techniques. Firstly, experimental impact tests were conducted on plates of 4 mm of thickness covering impact velocities from 50 m/s to 200 m/s and varying the stress state through the projectile nose shape: conical, hemispherical and blunt. The mechanisms behind the perforation process were studied depending on the projectile configuration used by analyzing the associated failure modes and post-mortem deflection. Secondly, a numerical study of the mechanical behaviour of aluminium alloy 2024-T351 under impact loading was conducted. To this end, a three-dimensional model was developed in the finite element solver ABAQUS/Explicit. This model combines Lagrangian elements with Smoothed Particle Hydrodynamics (SPH) elements. A good correlation was obtained between numerical and experimental results in terms of residual and ballistic limit velocities.
43 citations
TL;DR: A proper description of the target excitation spectrum as well as the inclusion of the energy-loss straggling is essential in the calculation of the proton beam depth-dose distribution.
Abstract: We have evaluated the spatial distribution of energy deposition by proton beams in liquid water using the simulation code SEICS (Simulation of Energetic Ions and Clusters through Solids), which combines molecular dynamics and Monte Carlo techniques and includes the main interaction phenomena between the projectile and the target constituents: (i) the electronic stopping force due to energy loss to target electronic excitations, including fluctuations due to the energy-loss straggling, (ii) the elastic scattering with the target nuclei, with their corresponding energy loss and (iii) the dynamical changes in projectile charge state due to electronic capture and loss processes. An important feature of SEICS is the accurate account of the excitation spectrum of liquid water, based on a consistent solid-state description of its energy-loss-function over the whole energy and momentum space. We analyse how the above-mentioned interactions affect the depth distribution of the energy delivered in liquid water by proton beams with incident energies of the order of several MeV. Our simulations show that the position of the Bragg peak is determined mainly by the stopping power, whereas its width can be attributed to the energy-loss straggling. Multiple elastic scattering processes contribute slightly only at the distal part of the Bragg peak. The charge state of the projectiles only changes when approaching the end of their trajectories, i.e. near the Bragg peak. We have also simulated the proton-beam energy distribution at several depths in the liquid water target, and found that it is determined mainly by the fluctuation in the energy loss of the projectile, evaluated through the energy-loss straggling. We conclude that a proper description of the target excitation spectrum as well
43 citations