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 Subsubsection 4.5.1.4: Park Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.6: Power 

4.5.1.5 Park Distortional

The material type for this relaxation function is “relaxation-Park-distortion”. The following material parameters need to be defined:
<tau0> Characteristic relaxation time [t]
<beta0> Power exponent at zero strain [ ]
<tau1> Characteristic relaxation time
<beta1> Power exponent at zero strain
<alpha> Power exponent
The reduced relaxation function for this material type is given by where and The definition of is given in Section 4.5.1.2↑.
 Subsubsection 4.5.1.4: Park Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.6: Power