China hydrodynamic penetration

Since then the theory has proved very useful in understanding and predicting results of many penetration experiments. The jet pierces the well casing and geologic formation, and a slow moving slug is simultaneously formed. Back to tab navigation Download options Please wait Long-rod penetration in a wide range of velocity means that the initial impact velocity varies in a range from tens of meters per second to several kilometers per second. Fetching data from CrossRef. Recently, several grid-less techniques have been developed which differ from traditional methods by relaxing mesh connectivity constraints.
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Modulating the rigidity of nanoparticles for tumor penetration

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Subscribe to Table of Contents Alerts. It is difficult to think of any other terrestrial event as fast as a shaped charge jet tip. Buy this article in print. Enter Your Email Address. It is found that for these two models there is no significant discrepancy for the length and velocity of the jet, while the shapes of the jet tip are different. Modulating the rigidity of nanoparticles for tumor penetration H.
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Hydrodynamic limit to penetration of a material by a high-power beam - IOPscience

In this paper, the entire process of HE detonation and explosion, explosion-driven metal deformation and jet formation as well as the penetrating effects is modeled using a smoothed particle hydrodynamics SPH method. The analysis results in a power series representation — in terms of inverse velocity — of normalized depth of penetration that reduces to the hydrodynamic solution at high impact velocities. The modified SPH method is first validated with the simulation of a benchmark problem of a TNT slab detonation, which shows accurate pressure profiles. At this acceleration the tip would reach the speed of light, were this possible, in around 1. But of course, it reaches a terminal velocity after only 40 millionths of a second. Both materials flow as if they were fluids and the penetration event can be modelled quite accurately using the Bernoulli equation for incompressible flow to give the well known hydrodynamic penetration equation.
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Principles of dimensional analysis are applied in a new interpretation of penetration of ceramic targets subjected to hypervelocity impact. When the high explosive is detonated, the metal liner is compressed and squeezed forward, forming a jet whose tip may travel as fast as 10 kilometers per second. It is universally agreed that conical liner collapse and target penetration both occur by hydrodynamic flow. After the explosion of high explosive HE charge, the detonation produced explosive gas can exert tremendous pressure on surrounding metal case and liner with very large deformation and even quick phase-transition. In contrast, in the former i. A modified scheme for approximating kernel gradient kernel gradient correction, or KGC has been used in the SPH simulation to achieve better accuracy and stability. Advances in mechanics software and computer hardware have led to an ever-increasing reliance on computational simulation to understand complex engineering systems.
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