Characteristics of the acceleration of plates by a glancing detonation wave in the presence of an additional or concentrated mass

Ivanov, A. G.; Kochkin, L. I.; Огородников, В. А.; Tyun'kin, E. S.

doi:10.1007/bf00843140

Cited by 4 publications

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“…In some cases important for practice, the moving liners can interact with various lumped elements in the form of metallic plates (stiffness ribs and supports) [2, 3] or rods (electrodes and segments of cable lines) [4,5]. The qualitative pattern of such interaction has been well studied.…”

Section: Results Of An Experimental and Numerical Study Of Interactiomentioning

confidence: 99%

“…The qualitative pattern of such interaction has been well studied. It was shown [3,4] that the process of interaction of a plate or a rod with a moving plate or cylindrical shell are little different and occur with formation of jets from their materials, the displaced material is distributed between them, and a cavity is formed. The quantitative aspect of these processes, however, which is associated with determining the amplitude of perturbations transferred over the lumped elements, has not been studied in much detail.…”

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Interaction of a metallic liner with lumped elements and transfer of perturbations over these elements

Огородников

Romanov

Erunov

et al. 2008

Combust Explos Shock Waves

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Results of an experimental and numerical study of interaction of a metallic liner accelerated by an explosion to a velocity of several kilometers per second with lumped elements in the form of plates are presented. Parameters of perturbations transferred over these elements are quantified.Metallic liners of plane, cylindrical, or spherical symmetry accelerated by explosive energy to velocities of several kilometers per second is often used in explosive generators to obtain high dynamic pressures [1]. In some cases important for practice, the moving liners can interact with various lumped elements in the form of metallic plates (stiffness ribs and supports) [2, 3] or rods (electrodes and segments of cable lines) [4,5]. The qualitative pattern of such interaction has been well studied. It was shown [3,4] that the process of interaction of a plate or a rod with a moving plate or cylindrical shell are little different and occur with formation of jets from their materials, the displaced material is distributed between them, and a cavity is formed. The quantitative aspect of these processes, however, which is associated with determining the amplitude of perturbations transferred over the lumped elements, has not been studied in much detail.Detailed quantitative information can be obtained from well-tested two-dimensional numerical calculations. Normally they are tested against experimental results in a simplified formulation. In the present work, we used a rather complicated arrangement of experi-; root@gdd.vniief.ru. ments, which was fairly close to real processes, to test two-dimensional calculations.Under shock-wave loading of lumped elements (plates and rods), the shock waves (SWs) generated therein degenerate with time into acoustic perturbations. As these perturbations propagate with a velocity of sound in the plate or the rod, which can be greater than the velocity of the liner accelerated in the explosive generator, the perturbations can arrive in the examined target earlier than the SW generated in the target by the liner impact. Thus, the perturbations can be responsible for distortions affecting the interpretation of test results. Clearly, determining the amplitude of these perturbations is of particular importance. A preliminary analysis shows that the amplitude of the perturbations considered may change from 0.01 to 0.1 GPa, depending on particular operation conditions of explosive generators, and the duration of the perturbations can reach 10 μsec. In the present work, the quantitative characteristics of the perturbations (amplitude and time) were determined by the capacitance gauge technique [6], and the process was visualized by the method of flash radiography and by the method of an ejected indicator, as in [3].The arrangement of experiments aimed at studying perturbations transferred over lumped elements is illustrated in Fig. 1. We used a 50/50 TNT/RDX high explosive (HE) charge 120 mm in diameter and 60 mm high. The charge was initiated over its entire

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Section: Results Of An Experimental and Numerical Study Of Interactiomentioning

confidence: 99%

mentioning

confidence: 99%

Interaction of a metallic liner with lumped elements and transfer of perturbations over these elements

Огородников

Romanov

Erunov

et al. 2008

Combust Explos Shock Waves

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“…The occurrence of microroughness is due to the surface finish (a R z and λ R z , where R z is the height of the surface microroughness). The incidence of a SW on a FS with defects, cavities, and attached masses is accompanied by ejection of cumulative flows of particles [4][5][6], which complicates the numerical modeling and prediction of the fragmentation and dispersion of structural materials under shock-wave loading. The processes occurring on a profiled FS upon incidence of a SW, especially for λ a R z , have been studied inadequately.…”

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Modeling jet flows caused by the incidence of a shock wave on a profiled free surface

Огородников

Михайлов

Romanov

et al. 2007

J Appl Mech Tech Phys

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The problem of the incidence of a shock wave with a front-pressure amplitude of about 30 GPa at the profiled free surface of an aluminum sample is studied. It is shown that in the case of large perturbations (amplitude 1 mm and wavelength 10 mm), jet flows occur on the free surface. The data obtained are described using a kinetic fracture model that takes into account the damage initiation and growth in the material due to tensile stress and shear strain.The normal incidence of a shock wave (SW) on the free surface (FS) of a condensed material sample without macroscopic features can lead to a number of effects due to the deviation of the SW velocity from the doubling law, velocity dispersion, particle ejection (dusting) from the FS [1-3]. However, the FS can have macroscopic features in the form of defects, artificial conical or hemispherical cavities and attached masses or a certain profile of, for example, a sinusoidal shape, whose amplitude a and wavelength λ far exceed the parameters characteristic of the FS microrelief. The occurrence of microroughness is due to the surface finish (a R z and λ R z , where R z is the height of the surface microroughness). The incidence of a SW on a FS with defects, cavities, and attached masses is accompanied by ejection of cumulative flows of particles [4][5][6], which complicates the numerical modeling and prediction of the fragmentation and dispersion of structural materials under shock-wave loading. The processes occurring on a profiled FS upon incidence of a SW, especially for λ a R z , have been studied inadequately. The present paper reports new experimental and calculation results from studies of the generation and propagation of perturbations caused by the incidence of a SW of intensity 30 GPa on the FS of AMts aluminum samples of sinusoidal shape with an initial amplitude 2a = 1 mm and a wavelength λ = 10 mm. A diagram of the experiments is given in Fig. 1.A cylindrical charge of a high explosive (HE) 120 mm in diameter and 60 mm high was initiated by a plane SW generator, which provided for a time difference for SW arrival at the sample of not more than 50 nsec. The FS of the sample in the form of a 130 × 130 mm plate 10 mm thick had cavities of sinusoidal shape, which allowed the use of a soft x-ray radiographic technique. Figure 2 gives X-ray photographs obtained at various times in the experiments (the dashed curves are drawn over the convexities of the sample relief). An analysis of the X-ray photographs shows that the displacements of the FS of the sample by 5 and 12 mm relative to the initial position, which correspond to the times in the X-ray photographs t γ = 29 and 31 µsec from the moment of HE initiation, leading jet flows are formed in the sample regions located under the initial concavities, and in the region of the initial convexities, there is deceleration of the sample material of lower density. The decreased density of the sample material observed in the X-ray photographs in the regions of convexities (Fig. 2b and c) is apparently caused by particl...

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Shock-wave dispersion of structural materials

Огородников

Ivanov

Kryukov

1999

Combust Explos Shock Waves

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Characteristics of the acceleration of plates by a glancing detonation wave in the presence of an additional or concentrated mass

Cited by 4 publications

References 0 publications

Interaction of a metallic liner with lumped elements and transfer of perturbations over these elements

Interaction of a metallic liner with lumped elements and transfer of perturbations over these elements

Modeling jet flows caused by the incidence of a shock wave on a profiled free surface

Shock-wave dispersion of structural materials

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