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 paper, an experimental investigation of phenomena associated with the oblique hypervelocity impact of a spherical projectile on multisheet aluminum structures is described, and a model that can be employed in the design of meteoroid and space debris protection systems for space structures is developed.
Abstract: An experimental investigation of phenomena associated with the oblique hypervelocity impact of spherical projectile on multisheet aluminum structures is described. A model that can be employed in the design of meteoroid and space debris protection systems for space structures is developed. The model consists of equations that relate crater and perforation damage of a multisheet structure to parameters such as projectile size, impact velocity, and trajectory obliquity. The equations are obtained through a regression analysis of oblique hypervelocity impact test data. This data shows that the response of a multisheet structure to oblique impact is significantly different from its response to normal hypervelocity impact. It was found that obliquely incident projectiles produce ricochet debris that can severely damage panels or instrumentation located on the exterior of a space structure. Obliquity effects of high-speed impact must, therefore, be considered in the design of any structure exposed to the meteoroid and space debris environment.
55 citations
TL;DR: In this article, a combined analytical, numerical and experimental investigation examined the conditions to fracture the 7.62mm, armor-piercing APM2 projectile core, and demonstrated that the erosion strain of the jacket is a critical parameter for successful simulations.
55 citations
TL;DR: It is discovered that, above a critical mass, the projectile reaches a terminal velocity and, therefore, an endless penetration and, consequently, the penetration dynamics of a projectile in a very long silo filled with expanded polystyrene particles are studied.
Abstract: An object falling in a fluid reaches a terminal velocity when the drag force and its weight are balanced. Contrastingly, an object impacting into a granular medium rapidly dissipates all its energy and comes to rest always at a shallow depth. Here we study, experimentally and theoretically, the penetration dynamics of a projectile in a very long silo filled with expanded polystyrene particles. We discovered that, above a critical mass, the projectile reaches a terminal velocity and, therefore, an endless penetration.
55 citations
TL;DR: In this paper, cross sections for the single and double ionization of He associated with no projectile charge change (direct ionization), single-electron capture, and singleelectron loss were measured using coincidence techniques and compared to existing experimental and theoretical results.
Abstract: Target ionization and projectile charge changing were investigated for 0.5{endash}8-MeV/q Li{sup q+}+He (q=1,2,3) collisions. Cross sections for the single and double ionization of He associated with no projectile charge change (direct ionization), single-electron capture, and single-electron loss were measured using coincidence techniques and compared to existing experimental and theoretical results. Total cross sections for single-electron capture (for Li{sup 1,2,3+}) and single-electron loss (for Li{sup 1,2+}) were also obtained. For a given incoming projectile charge state the double-to-single target ionization ratios R vary strongly with the outgoing reaction channel. For direct ionization, R is nearly independent of the incident projectile charge state and can be described by the semi-empirical scaling rule of Knudsen {ital et al.} [J. Phys. B {bold 17}, 3545 (1984)]. However, for ionization associated with single-electron loss and single-electron capture by the projectile, R depends quite strongly on the incident charge state of the projectile. These ionization ratios R are interpreted in terms of theoretical formulations involving electron-nucleus interactions and electron-electron interactions. {copyright} {ital 1998} {ital The American Physical Society}
55 citations
Patent•
18 Jul 1975TL;DR: In this article, an unknown explosive device is safely neutralized, that is, rendered inoptive, without disturbing the device, by penetrating the device with an explosive-driven captive projectile from a safe distance and injecting liquid nitrogen into the device through the projectile.
Abstract: An unknown explosive device is safely neutralized, that is, rendered inoptive, without disturbing the device, by penetrating the device with an explosive-driven captive projectile from a safe distance and injecting liquid nitrogen into the device through the projectile to cool some internal parts below the temperature at which they are operative.
55 citations