Table 6.
Estimates of the viscoelastic model parameters by fitting the shear modulus equation G*(ω) for the models having static stiffness as a parameter with the median of the estimated experimental complex shear modulus over the frequency range (500 Hz to 16 kHz) with static stiffness μ0 as an unknown parameter
| Model | μ0 (kPa) | 1st Parameter | 2nd Parameter | 3rd Parameter | 4th Parameter | Error (%) | AIC |
|---|---|---|---|---|---|---|---|
| Voigt | μ0 = 49.83 | η = 0.5455(Pa · s) | / | / | / | 29.97 | 624.5891 |
| Generalized Maxwell | μ0 = 27.5 | μ1 = 88.8(kPa) | μ2 = 22.8(kPa) | η1 = 0.57(Pa · s) | η2 = 2.17(Pa · s) | 29.6 | 624.7848 |
| Zener | μ0 = 36.4 | μ1 = 74.55(kPa) | η1 = 0.9217(Pa · s) | / | / | 13.67 | 573.0675 |
| fractional Voigt | μ0 = 16.72 | μα = 637.3(Pa · sα) | α = 0.4077 | / | / | 3.34 | 495.1964 |
| 3-parameter fractional Zener | μ0 = 18.33 | μα = 453(Pa · sα) | α = 0.4408 | μ1 = 106 (Pa) | / | 3.33 | 496.8971 |