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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20 Aug 2007
TL;DR: In this article, an advanced coupled computational fluid dynamics (CFD)/rigid body dynamics (RBD) technique that provides for a grid motion capability to fly a finned projectile on the supercomputers is described.
Abstract: This paper describes a computational study undertaken to compute the dynamic derivatives of a finned projectile using an advanced unstructured time-accurate NavierStokes computational technique. The numerical procedure uses an advanced coupled computational fluid dynamics (CFD)/rigid body dynamics (RBD) technique that provides for a grid motion capability to fly a projectile on the supercomputers. As a special case, this procedure can be run very easily in an uncoupled mode to model motions such as the pitching and the rolling of a projectile and compute the dynamic derivatives from these unsteady simulations. Time-accurate numerical computations have been performed for a finned body at different Mach numbers across the speed regime from subsonic to supersonic conditions using unstructured grids and the dynamic derivatives have been extracted from the uncoupled time-accurate CFD/RBD computations. Computed dynamic derivatives have been compared with actual data measured from free flight tests and experiments and are found to be generally in good agreement.
42 citations
01 Jul 1992-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, a single empirical formula for particle backscattering from surfaces under normal incidence conditions is reviewed in order to arrive at a general scaling relationship in terms of projectile energy and the masses of the colliding species.
Abstract: Previously published data on particle backscattering from surfaces under normal incidence conditions is reviewed in order to arrive at a general scaling relationship in terms of projectile energy and the masses of the colliding species. A single empirical formula is proposed which, with suitable coefficients, represents the available data base and provides a basis for interpolation and extrapolation. The formula is intended for use in codes for the modelling of particle recycling in fusion reactor devices. Attention is focused primarily on light projectile (H, D, T, He) reflection from candidate plasma facing materials and covers an energy range from tens of eV to 100 keV to encompass situations of interest in a fusion device. We also review briefly the case of self-ion reflection.
42 citations
01 Sep 2005
TL;DR: In this paper, an investigation has been conducted to guide the development of ceramic armor that protects against long-rod projectiles launched at ballistic-ordnance velocities by promoting a lateral flow of projectile erosion products at the ceramic, which minimizes stress and microdamage in the impinged area of the ceramic.
Abstract: : An investigation has been conducted to guide the development of ceramic armor that protects against long-rod projectiles launched at ballistic-ordnance velocities. Studies have concentrated on protection by diverting the projectile, but have also considered protection by maintaining a high resistance to penetration. A projectile is diverted by promoting a lateral flow of projectile erosion products at the ceramic, which minimizes stress and microdamage in the impinged area of the ceramic. Some resistance to lateral flow provides dynamic frontal support for the ceramic, and the projectile is fully consumed by lateral flow even though marginal rear support permits moderate macrodamage. The first part of the investigation has examined ceramic damage and the influences of materials, dimensions, target designs, and other factors, such as impact velocity and target obliquity. The second part of the investigation has briefly considered layered target designs that achieve protection by maintaining the ceramic element s high resistance to penetration. The interplay of material properties and characteristics and target designs must be further investigated to determine the potential for future ballistic armor designs.
42 citations
TL;DR: In this paper, the authors extended the standard linear theory to account for aerodynamic asymmetries caused by actuating canards and proposed an extended linear-projectile theory to address flight stability of projectiles with aerodynamic configuration asymmetry.
Abstract: Driven by the creation of new smart projectile concepts with maneuver capability, projectile configurations with large aerodynamic asymmetries are becoming more common. Standard linear stability theory for projectiles assumes the projectile is symmetric, both from aerodynamic and mass properties perspectives. The work reported here extends standard projectile linear theory to account for aerodynamic asymmetries caused by actuating canards. Differences between standard linear and extended linear theories reported here are highlighted. To validate the theory, time simulation of the extended linear theory and a fully nonlinear trajectory simulation are made for a representative scenario, with excellent agreement noted. The extended linear-projectile theory offers a tool to address flight stability of projectiles with aerodynamic configuration asymmetries.
42 citations
TL;DR: In this article, two-dimensional ballistic experiments are conducted in order to directly observe the transient deformation and failure processes occurring immediately under the projectile via high-speed photography, and it is shown that tensile ply failure by indirect tension rather than membrane stretching or shear failure at the edges of the projectile is the dominant penetration mechanism in UHMWPE laminates.
42 citations