Effect of Variations in the Gas-Dynamic Unloading on the Laser Initiation of the PETN–Aluminum Composite.

Autor: Aduev, B. P., Nurmukhametov, D. R., Zvekov, A. A., Liskov, I. Yu., Belokurov, G. M., Nelyubina, N. V.
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Zdroj: Technical Physics; Feb2019, Vol. 64 Issue 2, p143-147, 5p, 2 Diagrams, 3 Graphs
Abstrakt: Thresholds of explosive decomposition Hcr under irradiation using the first harmonic of a pulsed neodymium laser (14 ns) are experimentally determined for pentaerythritol tetranitrate (PETN) with aluminum nanoparticles (100 nm) at concentrations ranging from 0.05 to 1 wt %. Amplitudes of optoacoustic signals are measured versus concentrations of impurities in the sample at a fixed laser fluence. The experiments are performed in two regimes. In the first one, the irradiated surface of the sample is covered with a finite-weight glass plate that impedes the gas-dynamic unloading. In the second regime, an external pressure of no less than 107 Pa is applied to the glass plate to prevent the gas-dynamic unloading. The interpretation of the experimental effects is proven by the results of theoretical simulation. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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