Generalized shock adiabat for organic liquids

Voskoboinikov, I. M.; Afanasenkov, A. N.; Bogomolov, V. M.

doi:10.1007/bf00741687

Cited by 18 publications

(9 citation statements)

References 5 publications

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“…The position of the experimental point in the p-u coordinates was determined from the dependence [16,17] p por ρ 0 (k − 1), where u 0 and u por are the mass velocity of the continuous and porous material, respectively, p por = p back is the pressure in the porous material, and ρ 0 is the density of the continuous material. This dependence was obtained from the condition that, the porous material being compressed by the shock wave, the air in pores is compressed in accordance with the Hugoniot relation, and the ultimate compression is reached: h = γ + 1/(γ − 1) (γ = 1.4 for air).…”

mentioning

confidence: 99%

Effect of Strength and Plasticity of the Material and Particle Size of a Porous Medium on Shock-Wave Deformation

Огородников

Zhernokletov

Mikhailov

et al. 2005

Combust Explos Shock Waves

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The process of dynamic deformation of shock-loaded cylindrical "porous" samples of lead, tungsten, and the 95% W + 3.5% Ni + 1.5% Fe alloy consisting of particles 0.1-2.5 mm in size is considered. The shock-wave intensity was slightly lower than the values corresponding to complete compaction of the material. The influence of the particle size and material strength and plasticity on the processes considered is examined.In solving a number of applied problems associated, e.g., with acceleration of cylindrical shells by the energy of an explosion, one has to predict the characteristics of this process. The problem becomes much more complicated if the shell material loses its compactness during acceleration. The reasons for the loss of compactness can be spalling of the shell, its fragmentation by shear stresses, or the loss of stability in the course of shell implosion [1-3]. To correctly calculate the shell motion in such a state, one has to know the behavior of the fragmented material under dynamic compression. A medium with discontinuities is called a damaged, fragmented, or porous medium. Examples of such media are sand, crushed stone, chips, sintered powders, various foam-based materials, and ceramics. Investigation of their behavior under dynamic compression, especially in the range of pressures corresponding to their complete compaction, is of independent interest. It should be noted that development of reliable models of deformation of such materials is hindered by the lack of experimental data on their behavior under dynamic compression. This particularly refers to materials with a wide range of characteristic particle sizes (from tens of micrometers to several millimeters).In the range of comparatively low pressures, particles of materials under consideration under dynamic or shock-wave loading are first loaded by the shock wave (SW) and then are unloaded to surrounding pores. Because of the finite volume of the "porous" space, the particles experience several circulations of compression and rarefaction waves. This leads to formation of a transitional zone between the SW front and the region of final states; the width of this zone is determined by the time of decay of compression and rarefaction waves circulating in the particles or the time of pore implosion and by the thermal relaxation of particles [4]. When the oscillations decay, the SW propagates in a steady mode; dissipation of kinetic energy of the particle material in the shock-transition zone results in an increase in the thermal component of internal energy and in enhanced shock-induced heating of the porous material. In addition to these features, sintered powders, foam-based materials, and ceramics whose particles are connected by a skeleton have additional peculiarities caused by skeleton compression or breakdown. For this reason, the behavior of a porous or fragmented material under shock-wave compression can be characterized by propagation of complicated multi-wave structures consisting of one or several elastic precursors and a wave of ir...

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mentioning

confidence: 99%

Effect of Strength and Plasticity of the Material and Particle Size of a Porous Medium on Shock-Wave Deformation

Огородников

Zhernokletov

Mikhailov

et al. 2005

Combust Explos Shock Waves

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“…An analysis of the results revealed that the wave velocities D sh obtained by substitution of the mass velocities at the front of the oscillograms of the detonation wave profile u(t) into the corresponding shock adiabats were markedly below the detonation velocities D observed in the experiment: by approximately 400 m/sec for the 90/10 mixture and by 800 m/sec for the 65/35 mixture (The shock adiabats of the mixtures obtained from the generalized dependence for the shock compressibility of organic liquids were used: D sh = 1.2c 0 + 1.7u [10]. Here c 0 is the bulk sound velocity which was calculated for each concentration by the additive method using known values for NM and M: c 0 = 1346 m/sec for 90/10 mixture and c 0 = 1123 m/sec for 65/35 mixture.)…”

Section: Resultsmentioning

confidence: 99%

Detonation characteristics of diluted liquid explosives: Mixtures of nitromethane with methanol

Koldunov

Anan'in

Garanin

et al. 2010

Combust Explos Shock Waves

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Detonation in mixtures of nitromethane with methanol as an inert (nonexplosive) diluent is studied. Ignition experiments with mixtures in steel tubes of various diameters provided information on the effect of the degree of dilution on detonability.Mass velocity profiles with a chemical spike characteristic of detonation waves were recorded at the unsteady detonation front in all mixtures studied. This made it possible to distinguish the Chapman-Jouguet state and obtain a fairly complete set of detonation parameters. The dependence of the pressure in the detonation products on the methanol concentration is determined, which is required, in particular, to find the true (absolute) limit of detonation propagation for the concentration of diluted liquid explosives using the method proposed and validated by A. N. Dremin. Some results were found to be inconsistent with one-dimensional detonation theory.

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“…Voskoboinikov et al have used other ULH forms to estimate Hugoniots. [7,8] Predictions from the three methods [1,7,8] for FO are shown in Fig. 3.…”

Section: Universal Liquid Hugoniot (Ulh)mentioning

confidence: 99%

Hugoniot and properties of diesel fuel used in ANFO

Robbins¹,

Sheffield²,

Dattelbaum³

et al. 2012

AIP Conference Proceedings

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Generalized shock adiabat for organic liquids

Cited by 18 publications

References 5 publications

Effect of Strength and Plasticity of the Material and Particle Size of a Porous Medium on Shock-Wave Deformation

Effect of Strength and Plasticity of the Material and Particle Size of a Porous Medium on Shock-Wave Deformation

Detonation characteristics of diluted liquid explosives: Mixtures of nitromethane with methanol

Hugoniot and properties of diesel fuel used in ANFO

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