研究目的
To determine the explosive thresholds of RDX-Al and PETN-Al composites under the action of neodymium laser as a function of the aluminum content.
研究成果
The laser initiation of RDX-Al and PETN-Al composites was successfully performed, with minimal critical energy densities of 1 J/cm2 for RDX-Al at 0.2% aluminum mass fraction and 0.33 J/cm2 for PETN-Al at 0.1% aluminum mass fraction. The study provides optimal parameters for the development of optic detonators based on these composites.
研究不足
The study was limited to specific conditions of laser initiation and aluminum content in the composites. The gas dynamic energy losses were blocked by applying additional pressure, which may not be practical in all applications.
1：Experimental Design and Method Selection:
The study used a neodymium laser (wavelength 532 nm, pulse duration 14 ns) to initiate explosion in RDX-Al and PETN-Al composites. The laser beam was focused with a lens, and the pulse energy was varied using calibrated neutral light filters.
2：Sample Selection and Data Sources:
The composites were prepared using RDX and PETN powders with narrow size-distribution and aluminum nanopowder with an average diameter of 100 nm.
3：List of Experimental Equipment and Materials:
YAG:Nd3+-laser (SOLAR Laser Systems LQ929), second harmonics generator, calibrated neutral light filters, pyroelectric detector PE50BF-C, scanning electron microscopy (JEOL JSM 6390 LA), hydraulic press, analytical balances, optical microscope, micrometer screw gauge.
4：Experimental Procedures and Operational Workflow:
The composite samples were prepared by mixing RDX or PETN with aluminum nanopowder, ultrasonicated in a solvent, dried, and pressed into samples. The explosion was detected by a loud sharp sound, imprint on the aluminum base-plate, and flash of the glow measured by a photoelectron multiplier.
5：Data Analysis Methods:
The probability of explosion was calculated as a ratio of explosion events to the number of samples, and the critical energy density was determined at the 50% probability level.
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