Time Resolved Emission from Shocked Sapphire at 1.3 Mega-Bar

Abstract:

A pyrometer experiment was performed using the dynamic high pressure method; it shows that obvious emission phenomenon had been generated in the shocked sapphire windows. Shock stress in the sapphire was 1.3 Mega-bar. Recorded emission signal with nanosecond resolution at 850nm wavelength reveals nonlinear increase character. A time resolved absorption coefficient α (t) was taken to fit the radiance curve. The value of α (t) indicates that shock induced shear banding could be regarded as the emission source, seems increasing after the shockwave arriving in the sapphire windows.

• Periodical: Applied Mechanics and Materials (Volume 723)
• Pages: 769-773
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.723.769
• Online since: January 2015
• Authors: Dai Yu Zhang*
• Keywords: Emission, Sapphire, Shockwave

References

[1] N.C. Holmes,M. Ross W.J. Nellis, Phys. Rev.B. 52 (1995) 15835.

[2] D.E. Hare N.C. Holms, D.J. Webb , Phys. Rev.B. 66 (2002) 014108.

[3] P.A. Urtiew, J. Appl. Phys. 45 (1974) 3490-3493.

[4] R.G. McQueen D.G. Isaak, J. Geophy. Res. 95 (1990) 21753-21765.

[5] K. Kondo, Window problem and complementary method for shock-temperature measurements of iron , in : S. C. Schmidt, J. W. Shaner, G. A. Samara, and M. Ross (Eds. ), High Pressure Science and Technology, AIP Conf. Proc., New York, 1999, pp.31-34.

[6] D.E. Hare D.J. Webb S.H. Lee, N.C. Holmes, Optical Extinction of Sapphire Shock-Loaded to 250-260 GPA, in : M.D. Furnish, N.N. Thadhani, and Y. Horie (Eds. ), Shock Compression of Condensed Matter, AIP Conf. Proc., New York, 2002, pp.1231-1234.

DOI: 10.1063/1.1483761

[7] D.P. Sebban, J.L. Pelissier, W.W. Anderson, R.S. Hixson, D. B. Holtkamp, Characterization of Sapphire for Optical Pyrometry in Shock Experiments, in: M. D. Furnish, Y. M. Gupta, and J. W. Forbes (Eds. ), Shock Compression of Condensed Matter , AIP Conf. Proc., New York, 2004, pp.1289-1292.

DOI: 10.1063/1.1780474

[8] O. V. Fat'yanov, R. L. Webb, Y. M. Gupta, J. Appl. Phys. 97(2005) 123529.

[9] B.H. Billings, American Institute of Physics Handbook, 1st ed., McGraw Hill, New York, (1972).

[10] C.F. Bohren , D.R. Huffman, Absorption and Scattering of Light by Small Particles, 2nd ed., John Wiley & Sons, New York, (1998).

[11] G Y Hao, F S Liu, D Y Zhang, M J Zhang, Appl. Phys. Lett. 90 (2007)261914.

[12] D Y Zhang, F S Liu, G Y Hao, Y H Sun, Chin. Phys. Lett. 24(8) (2007)2341.

[13] M B Boslough, J. Appl. Phys. 58(1985) 3394.

[14] E Tochigi, Y Kezuka, N Shibata, A Nakamura, Y Ikuhara, Acta Mater. 60 (2012)1293-1299.

[15] J D Clayton, Proc. R. Soc. A. 465 (2009) 307-334.

[16] S B Yiadom, A K Khan, N Bassim, Sci. Eng. A. 615( 2014)373-394.

[17] M T Hanaoka, Y N Kunihito, J. Appl. Phys. 63(1988) 327-336.

[18] Kucherov Y, Hubler G, Michopoulos J, J. Appl. Phys. 111(2012)023514.