322 J.R. Foley and J.C. Dodson Constant, 1.42e7 Linear, 6.66e5 0 0.02 0.04 0.06 0.08 0.1 -700 -600 -500 -400 -300 -200 -100 0 100 200 a b c Strain vs. time (model and data) Time [s] Strain [μ m/m] Data Model 0 0.02 0.04 0.06 0.08 0.1 -300 -250 -200 -150 -100 -50 0 50 100 150 Strain vs. time (model and data) Time [s] Strain [μ m/m] Data Model Constant, 5.31e6 0 0.02 0.04 0.06 0.08 0.1 -300 -250 -200 -150 -100 -50 0 50 100 150 Strain vs. time (model and data) Time [s] Strain [μ m/m] Data Model Fig. 30.7 Data and model fitting results for (a) constant, (b) linear, and (c) quadratic parameterized complex modulus 0 2000 4000 6000 8000 10000 0 1 2 3 4 5 6 7 8 9 10 x 107 Frequency [Hz] Modulus [MPa] Constant (Real) Constant (Imag) x 100 Linear (Real) Linear (Imag) Quadratic (Real) Quadratic (Imag) Fig. 30.8 Estimates of the complex modulus as a function of frequency for constant, linear, and quadratic parameterizations
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