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 Subsubsection 4.5.1.6: Fung Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.8: Malkin Distortional User-Specified 

4.5.1.7 Malkin

This relaxation function is derived from the continuous relaxation spectrum given in [54]. The material type for this relaxation function is “relaxation-Malkin”. The following material parameters need to be defined:
<tau1> Characteristic relaxation time [t]
<tau2> Characteristic relaxation time [t]
<beta> Power exponent [ ]
These parameters must satisfy . When , the reduced relaxation function for this material type is given by where is the incomplete gamma function. In the limit as this function reduces to the form given by [30], where is the exponential integral function.
 Subsubsection 4.5.1.6: Fung Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.8: Malkin Distortional User-Specified