Although, up to now, there is no precise physical definition
of superplasticity phenomenon in polymeric materials;
from a phenomenological point of view, superplasticity can
be defined as very high deformations prior to local failure. In
the case of tensile tests under controlled strain rate, this
means very high elongations of the specimens before
rupture. Despite the lack of definition of any fundamental
mechanism for superplastic behavior, the evaluation of the
influence of strain rate on superplastic properties of a polymer
sheet material is a basic requirement for its economical
use. This objective is accomplished by the execution of a set of
tensile tests at different rates.