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Projectile

About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.


Papers
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Patent
20 Mar 2000
TL;DR: In this paper, the authors describe an apparatus for surface treatment by impact, the apparatus comprising a vibrating surface and at least one projectile suitable for being projected towards the surface to be treated by said vibrating surfaces.
Abstract: The invention relates to apparatus for surface treatment by impact, the apparatus comprising a vibrating surface and at least one projectile suitable for being projected towards the surface to be treated by said vibrating surface. The apparatus includes retaining means for keeping each projectile captive in the apparatus.

74 citations

Journal ArticleDOI
TL;DR: In this paper, a simple model based on the concepts of flow planes is used to determine the forces acting on the supercavitating projectile during impact, and a functional form of the coefficient of restitution is proposed to predict the impact behaviour quite well.

74 citations

Patent
28 Sep 2001
TL;DR: In this article, non-lethal ammunition for a riot gun includes a forwardly open casing, a projectile mountable in and dischargeable from the casing and a propellant cartridge extending into the casing interior, and a UV curable adhesive disposed in sealing relation about the propellant to effectuate uniform firing of the projectile.
Abstract: Non-lethal ammunition for a riot gun includes a forwardly open casing, a projectile mountable in and dischargeable from the casing, a propellant cartridge extending into the casing interior, and a UV curable adhesive disposed in sealing relation about the propellant to effectuate uniform firing of the projectile. The projectile includes rearward and forward end portions each provided with a central cavity with the rearward cavity enclosing the cartridge, a weight in the forward cavity for balancing and increasing the mass of the projectile, and a subassembly carrying in a nose thereof a chemical payload or chemical agent, the subassembly including a stem sized for interference fitment within the forward cavity to secure the subassembly to the projectile and having a chamber for positioning the weight in the forward cavity.

73 citations

Journal ArticleDOI
TL;DR: In this paper, the authors considered the problem of non-steady penetration of a rigid projectile into an elastic-plastic target of finite thickness, and a specific blunt projectile shape in the form of an ovoid of Rankine is used because it corresponds to a reasonably simple velocity field which exactly satisfies the continuity equation and the condition of impenetrability of the projectile.

73 citations

Journal ArticleDOI
TL;DR: In this article, the authors performed laboratory and drop tower experiments to study multiple impacts of small, highly porous dust-aggregate projectiles onto sintered dust targets, and measured the mass-accretion efficiency and the volume filling factor for different impact velocities between 1.5 and 6.0.
Abstract: In recent years, a number of new experiments have advanced our knowledge on the early growth phases of protoplanetary dust aggregates. Some of these experiments have shown that collisions between porous and compacted agglomerates at velocities above the fragmentation threshold velocity can lead to growth of the compact body, when the porous collision partner fragments upon impact and transfers mass to the compact agglomerate. To obtain a deeper understanding of this potentially important growth process, we performed laboratory and drop tower experiments to study multiple impacts of small, highly porous dust-aggregate projectiles onto sintered dust targets. The projectile and target consisted of 1.5 μm monodisperse, spherical SiO2 monomers with volume filling factors of 0.15 ± 0.01 and 0.45 ± 0.05, respectively. The fragile projectiles were accelerated by a solenoid magnet and combined with a projectile magazine with which 25 impacts onto the same spot on the target could be performed in vacuum. We measured the mass-accretion efficiency and the volume filling factor for different impact velocities between 1.5 and 6.0 . The experiments at the lowest impact speeds were performed in the Bremen drop tower under microgravity conditions to allow partial mass transfer also for the lowest adhesion case. Within this velocity range, we found a linear increase of the accretion efficiency with increasing velocity. In the laboratory experiments, the accretion efficiency increases from 0.12 to 0.21 in units of the projectile mass. The recorded images of the impacts showed that the mass transfer from the projectile to the target leads to the growth of a conical structure on the target after less than 100 impacts. From the images, we also measured the volume filling factors of the grown structures, which ranged from 0.15 (uncompacted) to 0.40 (significantly compacted) with increasing impact speed. The velocity dependency of the mass-transfer efficiency and the packing density of the resulting aggregates augment our knowledge of the aggregate growth in protoplanetary disks and should be taken into account for future models of protoplanetary dust growth.

73 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
2023650
20221,196
2021290
2020458
2019452