Optical measurements to probe inelastic deformation in shocked brittle materials

Kwiatkowski, C. S.; Gupta, Y. M.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p641
Academic Journal
Transparent, brittle materials are used routinely as optical windows in shock wave experiments. Deformation mechanisms in these materials when shocked above their elastic limit are not well understood. Time-resolved optical measurements (transmission, emission, and scattering) were obtained in shocked c-cut sapphire to examine and understand material failure mechanisms. Emission measurements, in the absence of an external light source, show weak but discernable broadband emission in particular situations. Single pass transmission measurements over 450-650 nm, using a broadband flashlamp, have shown that shorter wavelength light is preferentially extinguished, consistent with Mie scattering. Contributions to light extinction by scattering have been verified.


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