Detonation Meso-Scale Tests for Energetic Materials

Plaksin, I.; Campos, J.; Ribeiro, J.; Mendes, R.; Góis, José C.; Portugal, António; Simões, Paula; Pedroso, Lineu José

doi:10.1063/1.1483688

Cited by 5 publications

(3 citation statements)

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“…The external methods can be divided into three groups, defined by their measuring parameter: 1) measurement of the free surface velocities of an inert material (normally, a metallic foil); 2) determination of the velocity of the shock wave (SW) in a condensed inert material in contact with the explosive; and 3) direct determination of the induced pressure profile in an inert material. For 1), techniques such as electrostatic measurements of the SW velocity in PMMA barriers [2]; an array of electric pins connected to an oscilloscope [9]; using a streak camera to record argon-filled gaps [10], or the smear camera technique [11]; laser interferometric techniques [2], like Fabry-Perot [12], VISAR [13] and photonic Doppler velocimetry (PDV) [5,14,15] are used. Group 2) comprises methods such as streak cameras that can register images of a SW in water (aquarium test) [16], a moving copper grid in PMMA [9], or they can be connected to optical fibers that are embedded in a PMMA barrier [17]; the short circuit of composite carbon-resistors embedded in a PMMA slab [18]; recording of the pulse voltages, originated by the detonation electric effect [19], with oscilloscopes; and the photoelectric method [20], where an inert liquid emits radiation proportionally to the pressure that it is being applied to it.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Detonation Pressure of a PETN Based PBX with the Optical Active Method

Quaresma

Deimling

Campos

et al. 2021

Propellants Explo Pyrotec

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Detonation metrology is essential for the development of energetic materials, to characterize existing explosives, and to characterize materials behavior under high pressures. The optical active method (OAM), based on PMMA optical fibers (250 μm diameter) and their radiation transmission loss when shocked, was used to characterize the detonation wave (DW) and shock wave (SW) in inert barriers and applied to measure the detonation pressure in condensed explosives. The detonation velocity and detonation pressure of a PBX based on PETN (86 % PETN, 14 % Sylgard), known as Seismoplast were measured. The OAM with protected optical probes (POP) was used to determine the mean detonation velocity (7337 m s À 1 ), whereas the OAM with bare optical probes (BOP) was used to measure the induced shock velocities generated by Seismoplast on different thicknesses of PMMA (1-9 mm), aluminum and copper (1-7 mm). Based on the shock velocities at the interfaces between the explosive and the inert barriers, the CJ pressure of Seismoplast was determined as 21.2 GPa.

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Section: Introductionmentioning

confidence: 99%

Characterization of the Detonation Pressure of a PETN Based PBX with the Optical Active Method

Quaresma

Deimling

Campos

et al. 2021

Propellants Explo Pyrotec

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“…This high-resolution optical method has a spatial resolution of 250 μm and a time resolution of 1 ns [9,10,11,12]. These measurements are very useful to determine the performance of new materials during the development of new compositions [1,9]. In this case, small samples, in the order of 1 g, can be tested [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…These measurements are very useful to determine the performance of new materials during the development of new compositions [1,9]. In this case, small samples, in the order of 1 g, can be tested [9,10]. However, this technique requires an electronic streak camera which is very expensive [3].…”

Section: Introductionmentioning

confidence: 99%

Active and Passive Optical Fiber Metrology for Detonation Velocity Measurements

Quaresma

Deimling

Campos

et al. 2020

Propellants Explo Pyrotec

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The reaction rate of an explosive -also called detonation velocity -is the easiest parameter to measure, and also one of the most important in characterizing the process of detonation front propagation in a 1D approach. This paper presents some peculiarities that were observed during the testing of our passive/active optical methods to measure detonation velocity. Both methods were tested using bare optic fiber probes and optic fiber probes protected with a stainless steel tube. The active optical method uses a laser with a wavelength of 660 nm, and the recording system contains a window filter that blocks any radiation out-side the wavelength range of 650 to 665 nm. A plasticbonded explosive based on PETN (seismoplast) was used to test both experimental methods. For rectangular cross-section charges using the passive optical method with the two different probes, the detonation velocities obtained ranged from 7233 to 7324 m/s, with standard deviations between 1.1 and 6.0 %; for the active optical method, the experimental results for detonation velocity varied between 7261 and 7351 and were obtained with a standard deviation of 0.6 to 1.7 %.

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