In relativistic collisions involving high-Z projectiles and heavy target atoms, non-radiative electron capture (NRC) is a very important charge exchange process [1], a process mediated by three-body interaction. In general, a precise theoretical treatment of this process is very difficult to achieve since the Coulomb field of the fast moving projectile leads to distortions of the atomic target ...

When a projectile perforates the armor of a vehicle, the residual projectile entering the vehicle is accompanied by a much wider cloud of behind-armor debris (BAD) generated by stress wave interactions. BAD plays an important role in the evaluation of survivability of crew and components in a vehicle under fire. Survivability/vulnerability analysis codes (e.g., MUVES) require an input of BAD ch...

The penetration of a 30CrMnMo ultra-high molecular weight polyethylene armor by a high-speed fragment was investigated via experiments and simulations. Analysis of the projectile revealed that the nose (of the projectile) is in the non-equilibrium state at the initial stage of penetration, and the low-speed regions undergo plastic deformation. Subsequently, the nose-tail velocities of the proje...

The formation of supercavitation after a high-speed projectile enters water has decisive impact on the underwater ballistic and penetration projectile. In this study, Ansysfluent19.0 simulation software is used to study entry chosen at velocities 300, 400, 500, 600 m/s. cavitation characteristics, trajectories, flow-field characteristics are analyzed for 5.8-mm caliber conical flat head project...

Abstract Based on the N - S equation and k- ε model, this article uses dynamic grid technology to finish numerical simulation of projectile-barrel coupling for muzzle flow field double-barreled aircraft gun during asynchronous firing under different incoming Mach numbers intervals. The influence law projectile motion is studied. results show that when there supersonic flow, radial force will in...

Eye trauma results in 30,000 cases of blindness each year in the United States and is the second leading cause of monocular visual impairment. Eye injury is caused by a wide variety of projectile impacts and loading scenarios with common sources of trauma being motor vehicle crashes, military operations, and sporting impacts. For the current study, 79 experimental eye impact tests in literature...

Abstract This study calculates and comparatively tests the dynamic equilibrium angle characteristics of spin-stabilized projectile. Based on analysis spatial relationships angular motion projectile, a six-degrees-of-freedom (6 DoF) model is constructed. Through simulation calculation, changing law main parameters affecting with time obtained, then whole-trajectory curve drawn using approximate ...

We present 40 patients operated consecutively for pyloric stenosis during an 8-year period (1981-88). The most common symptom was projectile vomiting, which occurred in 92.5% of the cases. On examination only three patients had a palpable hypertrophic pylorus. In 39 patients, a preoperative x-ray examination with contrast was necessary to confirm the diagnosis. A pyleromyotomy was performed in ...