Shear Viscosity of Aluminium under Shock Compression

Based on the Newtonian viscous fluid model and the analytic perturbation theory of Miller and Ahrens for the oscillatory damping of a sinusoidal shock front, a flyer-impact technique is developed to investigate the effective viscosity of shocked aluminium. The shear viscosity coefficient is determined to be about 5000 poises at 42GPa with strain rate of 1.27×10⁶s^-1, which is a reasonable estimation compared with the results of other measurement methods.