Mechanism of initiation of condensed explosives by laser radiation

Brish, A. A.; Galeev, I. A.; Зайцев, Б. Н.; Sbitnev, E. A.; Tatarintsev, L V

doi:10.1007/bf00742068

Cited by 47 publications

(34 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Following [1][2][3][4][5], we can conclude that size effects are determined by optical, gas-dynamic, and thermophysical characteristics of high explosives in a particular experiment. Therefore, understanding the nature of the size effect can be a key point in understanding the mechanism of initiation as a whole.…”

mentioning

confidence: 94%

“…The size effect (dependence of the threshold energy density on the diameter of the laser beam on the sample surface) in laser-induced initiation of pressed powders of high explosives (HEs) was found in [1] and studied in detail in [2][3][4] (lead azide) and [5] (PETN). The existence of the size effect is attributed either to the laws of light scattering in the volume of transparent HE powders [2][3][4] or to one of the fundamental characteristics of high explosives, namely, critical diameter of detonation [1,5].…”

mentioning

confidence: 99%

“…The existence of the size effect is attributed either to the laws of light scattering in the volume of transparent HE powders [2][3][4] or to one of the fundamental characteristics of high explosives, namely, critical diameter of detonation [1,5].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Size effect in laser-induced initiation of a pyrotechnical composition (ammonium perchlorate and ultrafine aluminum)

Medvedev

Агеева

Tsipilev

et al. 2008

Combust Explos Shock Waves

View full text Add to dashboard Cite

The energy thresholds and ignition delays of pressed samples of a stoichiometric pyrotechnical mixture of ammonium perchlorate and ultrafine aluminum are studied as functions of the diameter of the laser spot created by a millisecond laser pulse. A clearly expressed size effect is found. A characteristic size determining the boundary between the wide and narrow beams of the laser pulse applied is determined. The influence of optical properties of the examined composition on the behavior of the size dependences is discussed. The relation between the nature of the size effect and the laws of light scattering in the volume of powdered pyrotechnical mixtures is considered.Key words: laser radiation, pyrotechnical mixture, size effect, ignition threshold.The size effect (dependence of the threshold energy density on the diameter of the laser beam on the sample surface) in laser-induced initiation of pressed powders of high explosives (HEs) was found in [1] and studied in detail in [2-4] (lead azide) and [5] (PETN). The existence of the size effect is attributed either to the laws of light scattering in the volume of transparent HE powders [2][3][4] or to one of the fundamental characteristics of high explosives, namely, critical diameter of detonation [1,5].There seem to be no publications on size dependences of laser-induced initiation of pyrotechnical mixtures. Following [1-5], we can conclude that size effects are determined by optical, gas-dynamic, and thermophysical characteristics of high explosives in a particular experiment. Therefore, understanding the nature of the size effect can be a key point in understanding the mechanism of initiation as a whole. A conclusion about a rather weak gas-dynamic unloading of the thermal spot in the course of ignition of a mixture consisting of 75% of ammonium perchlorate (AP) and 25% of ultrafine aluminum (UFA) under the action of a wide laser beam was made in [6]. The same feature can be expected for small-size regions as well. At the same 1 Tomsk Polytechnical University, Tomsk 634050, medvedev@tpu.ru. time, the optical characteristics of compositions can be varied within wide limits by adding various reagents or passive absorbing admixtures. Results of such experiments, which are described below, can provide valuable information about the structure and parameters of ignition spots.We considered an AP-UFA composition prepared by the method described in [6]. Charges of ≈10 mg were placed into an assembly, were pressed by a hydraulic press with a pressure of 4 · 10 7 N/m 2 to a density of ≈1.5 g/cm 3 , and were irradiated in a compressed state (Fig. 1). The reflection index at the laser radiation wavelength was measured in some experiments by a light-integrating sphere coated inside by BaSO 4 ; the value measured was ≈0.35. The light-integrating sphere had three orifices (windows): two of them were aligned along the axis at diametrically opposing ends of the sphere, and the third window was aligned at an angle of 45 • to the axis. Laser radiation with a wavelength of 1.06 μm...

show abstract

mentioning

confidence: 94%

mentioning

confidence: 99%

See 1 more Smart Citation

Size effect in laser-induced initiation of a pyrotechnical composition (ammonium perchlorate and ultrafine aluminum)

Medvedev

Агеева

Tsipilev

et al. 2008

Combust Explos Shock Waves

View full text Add to dashboard Cite

show abstract

“…4 Much of the work has used high-power, Q-switched lasers to shock heat the explosive (Region IV). These experiments were largely successful in promptly initiating insensitive explosives, [4][5][6][7][8][9][10] but the large and expensive high power lasers used in these experiments limited the practical application of such laser-initiated devices in ordnance systems.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the effects of scale and heating rate on micro-scale explosive ignition criteria.

Hafenrichter¹,

Pahl²

2005

View full text Add to dashboard Cite

Laser diode ignition experiments were conducted in an effort to characterize the effects of scale and heating rate on micro-scale explosive ignition criteria. Over forty experiments were conducted with various laser power densities and laser spot sizes. In addition, relatively simple analytical and numerical calculations were performed to assist with interpretation of the experimental data and characterization of the explosive ignition criteria.3

show abstract

“…Ignition by laser of explosive reactions, on pyrotechnic mixtures is currently the object of many works (1)(2)(3)(4)(5)(6)(7)(8) . The laser diodes are means particularly interesting because of the very great reliability of these devices like for their exceptional energetic efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Interface Conditions in the Case of Laser Diode Ignition of Pyrotechnic Mixtures

Opdebeck

Gillard

Radenac

2001

Propellants Explos. Pyrotech.

View full text Add to dashboard Cite

Mechanism of initiation of condensed explosives by laser radiation

Cited by 47 publications

References 2 publications

Size effect in laser-induced initiation of a pyrotechnical composition (ammonium perchlorate and ultrafine aluminum)

Size effect in laser-induced initiation of a pyrotechnical composition (ammonium perchlorate and ultrafine aluminum)

Characterizing the effects of scale and heating rate on micro-scale explosive ignition criteria.

Optimization of Interface Conditions in the Case of Laser Diode Ignition of Pyrotechnic Mixtures

Contact Info

Product

Resources

About