y=08G r2-e8 where where is called G the relaxation time Maxwell Kelvin-Voigt is called the complaince  s 1 G + t h æ è ç ö ø ÷ where h G is called the relaxation time   s G 1- e - t æ t è ç ö ø ÷ where t = h G J = g s is called the complaince