Open AccessВлияние изменения газодинамической разгрузки на лазерное инициирование композита ТЭН-алюминий
Author(s) -
Б.П. Адуев,
Д.Р. Нурмухаметов,
А.А. Звеков,
И.Ю. Лисков,
Г.М. Белокуров,
Н.В. Нелюбина
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/jtf.2019.02.47065.2471
Subject(s) - pentaerythritol tetranitrate , explosive material , fluence , materials science , irradiation , neodymium , laser , impurity , analytical chemistry (journal) , aluminium , amplitude , decomposition , optics , composite material , chemistry , chromatography , physics , organic chemistry , nuclear physics
Thresholds of explosive decomposition H _cr 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 10^7 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.