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


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Abstract

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.

About the authors

B. P. Aduev

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Author for correspondence.
Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

D. R. Nurmukhametov

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

A. A. Zvekov

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

I. Yu. Liskov

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

G. M. Belokurov

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

N. V. Nelyubina

Institute of Coal Chemistry and Material Science, Siberian Branch, Russian Academy of Sciences

Email: lesinko-iuxm@yandex.ru
Russian Federation, Kemerovo, 650000

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