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29 results on '"Tsipilev, V. P."'

2. Dependence of Energy Thresholds on Laser Radiation Wavelength in Initiation of Heavy Metal Azides

Author

Damamme, G., Lisitsyn, V. M., Malis, D., and Tsipilev, V. P.

Subjects
Condensed Matter - Materials Science, Physics - Optics
Abstract

The behavior of silver and lead azides (scaly and threadlike crystals, and compacted powders) in initiation of explosive decomposition by laser pulsed radiation has been investigated. Initiation energy thresholds in irradiation at wavelengths of 1064 nm, 532 nm, 354.7 nm, 266 nm corresponding to four laser radiation harmonics have been measured. Samples both uncovered and covered with a transparent dielectric (a quartz plate) with the compressive force of up to 0.5GPa were initiated. In the transparent spectral region (the first and second laser harmonics) of the heavy metal azide matrix the effect of covering the sample surface with a plate on initiation energy threshold was insignificant, whereas, in the region of bandgap absorption (the fourth harmonic) strong dependence of the initiation threshold on whether the surface under irradiation is uncovered or covered. The results obtained have been considered with the account of the influence of the transparent plate on gas-dynamic unloading of the thermal site, which is formed in the bandgap absorption of laser radiation in a thin near-surface layer., Comment: 14 pages, 4 figures

Published
2010

29. Investigation of the Effect of Small Hardening Spots Created on the Sample Surface by Laser Complex with Solid-State Laser

Author

Nozdrina, O, Zykov, I, Melnikov, A, Tsipilev, V, and Turanov, S

Abstract

This paper describes the results of an investigation of the effect of small hardening spots (about 1 mm) created on the surface of a sample by laser complex with solid-state laser. The melted area of the steel sample is not exceed 5%. Steel microhardness change in the region subjected to laser treatment is studied. Also there is a graph of the deformation of samples dependence on the tension. As a result, the yield plateau and plastic properties changes were detected. The flow line was tracked in the series of speckle photographs. As a result we can see how mm surface inhomogeneity can influence on the deformation and strength properties of steel.

Published
2018

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