Flow Curve
Flow curve gives a true indication of deformation characteristics because it is
based on the instantaneous dimension of the specimen. The flow curve is also
known as the true stress-strain curve
True Stress (σT)
True stress is the stress determined by the instantaneous load acting on the
instantaneous cross-sectional area True stress is related to engineering stress:
Assuming material volume remains constant
True Strain (εT)
The rate of instantaneous increase in the instantaneous gauge length