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Subsubsection 4.5.1.2: Exponential Distortional Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.4: Park

#### 4.5.1.3 Fung

The material type for this relaxation function is “relaxation-Fung”. The following material parameters need to be defined:
 Characteristic relaxation time [t] Characteristic time [t]
The reduced relaxation function for this material type is given by where is the exponential integral function.
Subsubsection 4.5.1.2: Exponential Distortional Up Subsection 4.5.1: Relaxation Functions Subsubsection 4.5.1.4: Park