The equation of state of two alumina-filled epoxy resins

The shock Hugoniots of two different alumina-epoxy particulate composites have been measured in terms of shock velocity, particle velocity and shock stress. Both shock velocities and shock stresses increase with increasing amounts of alumina loading. The shock velocity-particle velocity relationships have been shown to be linear, and that with increasing alumina, behaviour shifts from a viscous to a response more commonly seen in metals and ceramics. Comparisons of the calculated hydrodynamic pressure and shock stress suggest that these materials have a constant shear strength with increasing shock stress. Finally, comparison of the material with the highest amount of alumina, with the work of others, shows close agreement.