The mechanics governing the lateral cracks that form when a hard object plastically penetrates a ceramic is presented. The roles of indentation load, penetration depth, and work of indentation are all highlighted, as are the influences of the mechanical properties of the material. A closed form solution for cracking induced by expansion of a two-dimensional cavity is used to bring out essential...

one of the most common methods for controlling and increasing maneuverability of projectiles, especially the ones which move at high altitude and in low density air, is using lateral or reaction jets. the resultant force of the reaction jet is related to the jet and flow parameters. for finding their relation experimental, numerical, and analytical methods have been used. in order to change the...

Researchers use a variety of target materials, and sometimes combinations in their archaeological experiments to examine thrust-spear or projectile penetration, impact angle, durability, other issues involving prehistoric hunting weaponry. This materials is beneficial science several ways, but it may also hinder the comparison results because many these do not necessarily share similar physical...

Abstract In order to discuss the effect of different outer liner material on performance double cylinder-cone shaped charge, nonlinear dynamics software Autodyn-2D was used carry out numerical simulation, and jet shape penetration steel target were analysed when copper, nickel, tungsten, tantalum as materials copper inner cover material. The result shows that head is formed by cylindrical part ...

the theoretical calculation of the energies of projectile like fragments (plfs) using the heavy-ion reactions between 76ge and 198pt are reported in this article. the incident beam energy was 635 mev. the calculated values of plfs are compared with the previous experimental results and it is shown that the theoretical calculations of plfs are consistent with the experimental values. the elastic...

Modern field fortification systems are very large and cause a logistical burden during setup, thus setting the requirement for their modification. A simulation study was conducted to correlation between compaction of sand energy absorbed by it when impacted solid steel projectile at 850 m/s. Furthermore, sandbag modified addition plates in system observe change penetration absorption behaviour ...

– Based on our experimental studies of the electron screening effect in the H(d, p)H reaction for five deuteron-implanted solid targets (C,Al,Zr,Pd,Ta), theoretical calculations have been performed within an improved dielectric function theory. The theory describes correctly the observed target material dependence of the screening energies, underestimating, however, the absolute values by about...

The propagation of cracks in layered glass from low-velocity impact of sharp or spherical tip projectiles is observed using high-speed photography. Tests are also carried out to determine the threshold impact energy for chipping in glass blocks and subsurface crack instability in an edge-supported glass plates. The results identify the median and subsurface radial crack systems as the prime dam...

Explosives create and energize particles that act as projectiles prone to further fragmentation or create other secondary missiles in the body. These fragments may result in secondary injuries. This has been repeatedly described in the orthopedic and neurosurgical literature. We report the same process for abdominal injuries after fascial penetration in the military setting. This is an observat...

In this contribution we present numerical simulations of full impact of the Super Proton Synchrotron (SPS) beam with a solid tungsten cylindrical target that is facially irradiated. The beam comprises of 288 bunches and each bunch is made of 1.15 × 10 450 GeV protons. The bunch length is 0.5 ns and two neighboring bunches are separated by 25 ns so that the total duration of the beam is about 7 ...