Constitutive Equations

• Describe the relations between stress and strain in terms of the variables of strain rate and temperature

• Early concept: f(?,?,?,T) = 0

  • Analogous to equilibrium in thermodynamics system which states that: f(P, V, T) = 0

• There are several forms of constitutive relations, including the simple power law relation (Hollomon equation) and it’s variants.

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