Wyniki wyszukiwania - BazTech

1

Scaled-down test arrangements for characterizing high explosives

Künzel Martin, Kučera Jindrich

Materiały Wysokoenergetyczne

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2021

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T. 13

28--33

EN

Newly formulated explosives and the optimization of explosive mixtures requires an experimental determination of detonation parameters, especially detonation velocity, pressure and metal accelerating ability. Increasing material and labour costs force researchers to reduce test quantities and therefore to develop smaller scale experiments which provide sufficient data to determine an explosive’s properties. Seven test set-ups found in literature are described and compared in this paper.

PL

Otrzymywanie nowych materiałów wybuchowych i optymalizacja mieszanin wybuchowych wymaga eksperymentalnej weryfikacji parametrów detonacyjnych, zwłaszcza prędkości detonacji, ciśnienia i zdolności do przyspieszania wyrobów metalowych. Rosnące koszty materiałów i pracy zmuszają badaczy do minimalizowania testowanych ilości, a tym samym do opracowywania eksperymentów na małą skalę, które dostarczają wystarczających danych do oceny właściwości materiałów wybuchowych. W artykule opisano i porównano pod tym kątem siedem przykładów literaturowych układów badawczych.

2

Detonation Parameters of PlSEM Plastic Explosive

Cardoso Aline Anastacio, Selesovsky Jakub, Künzel Martin, Kucera Jindrich, Pachman Jiri

Central European Journal of Energetic Materials

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2019

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Vol. 16, no. 4

487--503

EN

PlSEM is a plastic explosive based on RDX, PETN and a non-explosive binder, and is used in linear shaped charges for demolition purposes. Its experimentally obtained detonation parameters are presented in the present paper. The detonation velocity was measured for cylindrical charges of various diameters, with and without confinement. The detonation pressure and particle velocity were determined using an impedance window matching technique, and cylinder tests were used to obtain the parameters of the JWL equation of state of the detonation products. Detonation velocities from 7.75 to 8.05 km·s–1 were obtained for unconfined charges with diameters from 4 to 8 mm, and from 8.15 to 8.24 km·s–1 for charges with 25 mm diameter. The experimentally determined detonation pressure was found to be 24.6 GPa.

3

Determination of the Equation of State for the Detonation Products of Emulsion Explosives

Trzciński Waldemar A., Szymańczyk Leszek, Kramarczyk Bartłomiej

Central European Journal of Energetic Materials

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2019

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Vol. 16, no. 1

49--64

EN

In this workcylinder testswere performed for two emulsion explosives (Emulinit 8L and Emulinit GM1) used in the mining industry. Based on the results of the tests, the detonation pressure and energy of these explosives were estimated. The detonation characteristics obtained, the profile of the expanding copper tube and the results of the numerical simulation enabled the constants in the JWL(Jones-Wilkins-Lee) equation of state to be determine for the detonation products of these two explosives.

4

Determination of the JWL Constants for ANFO and Emulsion Explosives from Cylinder Test Data

Sanchidrián J. A., Castedo R., López L. M., Segarra P., Santos A. P.

Central European Journal of Energetic Materials

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2015

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Vol. 12, no. 2

177--194

EN

The Jones-Wilkins-Lee (JWL) equation of state parameters for ANFO and emulsion-type explosives have been obtained from cylinder test expansion measurements. The calculation method comprises a new radial expansion function, with a non-zero initial velocity at the onset of the expansion in order to comply with a positive Gurney energy at unit relative volume, as the isentropic expansion from the CJ state predicts. The equations reflecting the CJ state conditions and the measured expansion energy were solved for the JWL parameters by a non-linear least squares scheme. The JWL parameters of thirteen ANFO and emulsion type explosives have been determined in this way from their cylinder test expansion data. The results were evaluated through numerical modelling of the tests with the LS-DYNA hydrocode; the expansion histories from the modelling were compared with the measured ones, and excellent agreement was found.

5

Badanie wpływu skali eksperymentu na wyniki testu cylindrycznego

Trzciński W. A., Szczepanik M.

Biuletyn Wojskowej Akademii Technicznej

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2014

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Vol. 63, nr 1

193-204

PL

W pracy zbadano wpływ skali eksperymentu na wyniki testu cylindrycznego służącego do wyznaczania zdolności miotających materiałów wybuchowych. Do badań wytypowano materiały wybuchowe stosowane w amunicji (trotyl, heksogen) oraz materiały o przeznaczeniu cywilnym (amonale). Stosowano rurki miedziane o różnej średnicy i grubości ścianki. Wyciągnięto wnioski odnośnie do celowości zwiększania lub zmniejszania skali w teście cylindrycznym.

EN

In the work, influence of a scale of experiment on the results of cylindrical test used to determine the acceleration capabilities of explosives was analyzed. Explosives used in ammunition (TNT, hexogen) and explosives for civil purpose (ammonals) were selected for testing. Copper tubes with different diameters and wall thickness were used. Conclusions are drawn regarding the advisability of increasing or decreasing the scale of the cylinder test.

6

Influence of Geometry and Material Properties on an Explosive's Gurney Velocity and Energy

Backofen J. E.

Central European Journal of Energetic Materials

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2006

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Vol. 3, nr 4

23-40

EN

Experimental data from many scientific publications reveal that the copper cylinder test used internationally to measure an explosive's Gurney Velocity and Gurney Energy falls within a unique combination of geometry and material properties - factors affecting an explosive's measured performance. These data also support the need to use two separate propulsion events to model detonation-driven propulsion: a brisant first stage and a gas-dynamic second stage.