Intense compression of a substance by means of accumulated energy from explosives

Derentowicz, H.

doi:10.1007/bf00860700

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Cumulation (sometimes referred to as implosion) is well-known technique to raise parameters of explosivedriven shock wave generators. Explosive devices [32][33][34], utilizing the irregular Mach reflection of conical converging SW, are known from 1970 th . The single reflection mode was realized, characterized by rapid pressure decrease behind Mach configuration.…”

Section: Methodsmentioning

confidence: 99%

“…A slower attenuation of pressure can be obtained in device, proposed in [35], where a double Mach reflection is realized. Mach configuration is formed there in a layered cylindrical central body "hard shell-soft core", but the explosive charge and liner remain conical, as in [32][33][34], that considerably complicates the fabrication of device.…”

Section: Methodsmentioning

confidence: 99%

“…In [34], the complete rejection of conical parts in favor of cylindrical was proposed. In this case, a conical detonation wave is generated by sequential initiation of the main charge by a multipoint detonation distributor.…”

Section: Methodsmentioning

confidence: 99%

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Shock induced melting of sapphire

Ostrik

Nikolaev

2022

J. Phys.: Conf. Ser.

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The method for calculation the melting curves of crystalline bodies based on the Debye model of heat capacity and the Lindemann melting rule is proposed. Hugoniot shock adiabate, determined in dynamic experiments and thermophysical characteristics of the substance under normal conditions are used as input data. Mathematically, the calculation of the melting curveis reduced to the Cauchy problem for a system of ordinary differential equations. This system is solved numerically by the Runge-Kutta method. Using the proposed method, the melting curves of copper, silver, gold, and sapphire at high pressures are calculated. The results obtained for copper, silver and gold were compared with available calculated and experimental data to validate the method. Experiments on shock compression of transparent sapphire sampleswere performed, using a Mach-type cumulative explosive generators. Investigated pressure range (280-1350 GPa) covered a region of shock-induced melting. The temperature of shock front was registered by fast optical pyrometer together with shock velocity. Particle velocity andpressure were obtained by impedance matching technique. Satisfactory agreement of calculatedand experimental data on temperature of melting behind the shock wave front in sapphire was obtained.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Shock induced melting of sapphire

Ostrik

Nikolaev

2022

J. Phys.: Conf. Ser.

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“…Pressure generators with irregular SW reflection were first proposed in ref. [1,[38][39][40][41][42]. These configurations used cone-shaped high explosive charge, liner, and central body.…”

Section: Experimental Techniquementioning

confidence: 99%

Measurement of dense plasma temperature of the shock‐compressed silicon

Nikolaev

Kulish

Dudin

et al. 2021

Contributions to Plasma Physics

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Measurements of the brightness temperature and compressibility of a dense silicon plasma formed by powerful shock waves (SWs) passing through a single‐crystal sample have been carried out. Plane SWs were created using an explosive technique: the traditional plane acceleration of a steel driver plate made it possible to obtain pressures in silicon up to 133 GPa, and the use of “Mach” cumulative generators realized the pressures up to 510 GPa. The shock Hugoniot of silicon was determined by the impedance matching with α‐quartz as the reference. The intensity of emitted thermal radiation was measured in the infrared range λ ∼ 1.5 μm, where silicon is optically transparent, and in the visible range of the spectrum. A significant (up to five times) understatement of the measured values of the brightness temperature in comparison with the values calculated by the equation of state was found. Taking into account the reflective properties of the SW in silicon does not lead to an agreement with the experiment. The estimates of relaxation processes behind the shock front suggest the presence of a zone of the establishment of ionization equilibrium with a width of ∼10 μm.

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