High Quality Content by WIKIPEDIA articles! Flow stress is defined as the instantaneous value of stress required to continue deforming the material - to keep the metal flowing. It is the yield strength of the metal as a function of strain, which can be expressed: Yf = Ken. Yf = Flow stress, MPa e = True strain K = Strength Coefficient, MPa n = Strain hardening exponent. Hence, Flow stress can also be defined as the stress required to sustain plastic deformation at a particular strain.

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