Ultrafine particle size distribution during high velocity impact of high density metals

Abstract

Luminescence induced by high-velocity impacts of metallic particles on metal surfacesAbstract. In the event of high-energy penetrator impact, people involved in battlefield scenarios are exposed to the additional hazard stemming from ultrafine metallic particles, i.e. exposure, inhalation, and respiration of aerolized metals. In order to have reliable quantitative measurement of the aerosol particles generated under controlled impact conditions, an experimental set-up was designed to perform impact tests with light gas-gun in chamber. During the impact events, aerosol particle size distributions and total concentrations were measured with a one-second time resolution. In this study preliminary results relative to high purity copper projectile impact at different velocities are presented.

Ultrafine Particle Distribution and Chemical Composition Assessment during Military Operative Trainings

“…Time change and size distributions of UFP count following ammunition-blasting operations were similar to those observed during high-speed impact of inert bombs; some differences in the peak readings were related to the variable distances of the stationary sampler from the detonation box [ 20 , 22 ].…”

“…Instead, in inert bomb launches, we expected generation of particles in the large size range, because of the mechanical impact of the inert to the ground from high altitude. However, previous studies suggested a potential UFP production during high-speed mechanical impacts [ 22 ].…”

“…The majority of the studies conducted on battlefield or military scenarios have focused on measurement of microparticles through gravimetric techniques followed by chemical characterization [ 19 ], while only few studies investigated airborne UFP emissions during selected military activities [ 20 , 21 , 22 ]. Such studies were performed with several UFP detection techniques, for example using a condensation particle counter (CPC), fast mobility particle sizer (FMPS) and aerodynamic particle sizer spectrometer (APS).…”

Influence of thermal process on particle size distribution of ultrafine magnesium powder prepared by inert gas condensation method

“…Nano magnesium particle is also a promising material for cancer therapeutics in biomedical science. While any changes to the particle size distribution (PSD) can affect the size-determined nano-properties or potential nanoproperties to a great extent, this leads to the fact that the application fields vary with each PSD [15][16][17][18][19]. Hence, the master of each PSD formation conditions is of prime importance.…”

Ultrafine particle generation by high-velocity impact of metal projectiles

“…RoR experiment was performed to avoid friction forces along the impact surface during impact, in order to integrate data already obtained with classic Taylor impact test against anvil [17,18]. a barrel (3500 mm long) in which the projectile is accelerated by the expanding fluid, and an impact chamber (2.5 m 3 ) where the impact occurs and the measurements are performed.…”