3. Internal friction peak

The relationship between stress σ* and strain ε* is written :

ε * (t ) = J* (ω ) σ* (τ )

or ε*(t ) = [ J ' (ω ) – iJ '' ( ω )]σ* (t )

where J ' is real dynamic complacency and J '' is imaginary dynamic complacency.

The dynamic response of the material is defined in the Zener model by the equations : $J^{'} = J_{U} + \frac{J_{R} - J_{U}}{1 + ω^{2} τ_{σ}^{2}}$

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Internal friction peak

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