ompression testing has been used with ramped changes in strain rate during deformation, and with changes in strain rate between double
deformations to study their effects on flow stress. No systematic deviations from a mechanical equation of state were found for ramped increase or
decrease in strain rate, even at the highest experimental ramping rates. In the two deformation tests, static recovery between deformations reduced
the initial flow stress below the value for an equation of state by an amount dependent on time. The reduction was increased when strain rate was
increased for the second deformation, and the strain interval required to re-establish the equation of state flow stress is uniquely related to the initial
reduction in stress
