|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Effect of Deviatoric Material Response on Perturbed Shock Front Stability
||Saul Opie, Elizabeth Fortin, Ashish Gopalakrishnan, Eric Loomis, Pedro Peralta
|On-Site Speaker (Planned)
Computational modeling and experimental measurements on metal and polymer samples subject to a laser-driven, ablative Richtmyer-Meshkov instability were carried out to study deviatoric material response. In particular, numerical and analytical solutions, coupled with measurements of fed-through perturbations, generated by perturbed shock fronts onto initially flat surfaces, show promise to calibrate and validate strength or viscous models in the post shocked material. In particular, the amplitude of perturbed shock fronts was measured using spatially resolved velocity interferometry along a line about 1 mm long in metallic (Cu, Al, Fe) and polymer (polyurea) samples with surface perturbations for pressures ranging from 10 to 50 GPa. These measurements, as a function of sample thickness-to-perturbation wavelength ratios, along with modeling can provide insight into deviatoric behavior, since analytical and numerical results show that strength and viscosity lead to significantly different dependences of shock front perturbation evolution on initial perturbation amplitude and wavelength.
||Planned: Supplemental Proceedings volume