| E*(ω): | complex modulus (MPa). |
| E00 and η00 | value of the complex modulus and the viscosity when ωτ → 0. |
| ω: | is the angular frequency, so that ω/2π is equal to the frequency. |
| ηi and Ei: | viscosity and elastic modulus of each Kelvin Voigt branch. |
| D(t): | creep compliance (1/MPa). |
| τ: | is the relaxation time for single branch. |
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