30 Estimating Frequency-Dependent Mechanical Properties of Materials 319 Fig. 30.3 Schematic of two-bar experiment showing sensor locations and the polymer bar support mechanism Fig. 30.4 Photos of two-bar experiment highlighting the polymer bar support mechanism 0.038 0.04 0.042 0.044 0.046 0.048 0.05 0.052 0.054 0.056 0.058 -600 -400 -200 0 200 400 Strain time history Time [s] Strain [μ m/m] 18 in. 36 in. 74 in. 77 in. 82 in. Fig. 30.5 Strain time history in the hollow aluminum incident (xi D18 and 36 in.) and solid polyurethane transmission (xi D74, 77, and 82 in.) bars
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