Investigation of shock wave effects on positron annihilation in copper and tungsten

Shock-induced reactions (or shock synthesis) have been studied since the 1960’s but are still poorly understood, partly due to the fact that the reaction kinetics are very fast making experimental analysis of the reaction difficult. Shock synthesis is closely related to combustion synthesis, and occurs in the same systems that undergo exothermic gasless combustion reactions. The thermite reaction (Fe2O3 + 2Al -> 2Fe + Al2O3) is prototypical of this class of reactions. The effects of shock-wave passage through porous (powder) materials are complex, because intense and non-uniform plastic deformation is coupled with the shock-wave effects. Thus, the particle interiors experience primarily the effects of shock waves, while the surfaces undergo intense plastic deformation which can often result in interfacial melting. Shock synthesis of compounds from powders is triggered by the extraordinarily high energy deposition rate at the surfaces of the powders, forcing them in close contact, activating them by introducing defects, and heating them close to or even above their melting temperatures.

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Shock wave effects during a Taylor test

Journal de Physique IV (Proceedings) ◽

10.1051/jp4:2006134163 ◽

2006 ◽

Vol 134 ◽

pp. 1065-1070

Author(s):

E. Lach ◽

M. Scharf

Keyword(s):

Shock Wave ◽

Taylor Test ◽

Wave Effects

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Analysis Techniques for Modeling the Pressure Wave Effects of Guillotine Ruptures of Steam Lines

ASME 2011 Pressure Vessels and Piping Conference: Volume 4 ◽

10.1115/pvp2011-57396 ◽

2011 ◽

Author(s):

Charles Becht ◽

Frederick J. Moody

Keyword(s):

Shock Wave ◽

Propagation Model ◽

Shock Propagation ◽

Cfd Model ◽

Analysis Techniques ◽

Wave Effects ◽

Fluid Properties ◽

Potential Damage ◽

Pipe Geometry ◽

Propagation Properties

The rupture of a pipe containing gas or steam at high pressure will cause a shock wave. In order to assess the potential damage that such a shock wave may cause to the surrounding structures, systems and components, it is necessary to determine the amplitude and propagation properties of the shock. A CFD model has been developed for the purpose of predicting shock propagation transients resulting from a sudden pipe rupture in terms of the fluid properties, pipe geometry, and surroundings. A simplified shock propagation model also is included, which offers verification of the CFD model results.

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Shock wave effects on a turbulent flow

Physics of Fluids A Fluid Dynamics ◽

10.1063/1.857960 ◽

1991 ◽

Vol 3 (7) ◽

pp. 1792-1806 ◽

Cited By ~ 53

Author(s):

Douglas Rotman

Keyword(s):

Shock Wave ◽

Turbulent Flow ◽

Wave Effects

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NUMERICAL ASSESSMENT OF THE SELECTED SUPPORTING ELEMENT CARRYING CAPACITY OF CRITICAL INFRASTRUCTURE FACILITY / SZACOWANIE NUMERYCZNE NOŚNOŚCI WYBRANEGO ELEMENTU KONSTRUKCYJNEGO OBIEKTU INFRASTRUKTURY KRYTYCZNEJ

Journal of Konbin ◽

10.2478/jok-2013-0079 ◽

2013 ◽

Vol 26 (1) ◽

pp. 29-42 ◽

Cited By ~ 1

Author(s):

Jerzy Małachowski ◽

Marian Klasztorny ◽

Łukasz Mazurkiewicz ◽

Damian Kołodziejczyk ◽

Tadeusz Niezgoda

Keyword(s):

Shock Wave ◽

Modeling And Simulation ◽

Energy Absorption ◽

Carrying Capacity ◽

Critical Infrastructure ◽

Cylindrical Panel ◽

Numerical Assessment ◽

Wave Effects ◽

Protective Cover ◽

Supporting Element

Abstract Issues related to critical infrastructure safety is highly demanding in aspect of newly projected systems. In this paper a problem of modeling and simulation of the supporting structure behavior of critical facility (without or with proposed protective cover) loaded with a shock wave is presented. Authors assume that two different phenomena will be responsible for minimization of shock wave effects: flow around cylindrical panel and energy absorption by panel structure. In this paper research focuses on the description and analysis of the process of explosion near the supporting elements and the blast interaction with the structure.

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