Flow stress

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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: [1]

Yf = Ke^n

Yf = Flow stress, MPa 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.

The flow stress is a function of plastic strain.

Metal Properties that have an effect on flow stress [1].

a) Chemical composition

b) Purity

c) Crystal structure

d) Phase constitution

e) Exit microstructure

f) Grain size

g) Heat treatment state

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[edit] References

  1. ^ Flow Stress

[1] Mikell P. Groover, 2007, "Fundamentals of Modern Manufacturing; Materials, Processes, and Systems," Third Edition, John Wiley & Sons Inc.