Abstract
An indirect method has been proposed [see J. Acoust. Soc. Am. 102, 3549–3555 (1997)] to determine the complex, frequency-dependent, elastic moduli of polymers containing microscopic inclusions from laser-based measurements and finite element modeling. The method consists in measuring the surface dynamics of the sample under harmonic excitation by noncontact laser Doppler interferometry. The experimental results are then matched with numerical predictions in which the moduli are the adjustable parameters. The method is first validated at ambient pressure by measuring the dynamic moduli of a sample of known properties. Results obtained with samples of the same voided viscoelastic material but with different aspect ratios are presented. To assess the effect of static pressure on the moduli, the sample is placed inside a static pressure air chamber (0–500 psi) and the effect of pressure cycling is investigated by measuring the moduli during the first pressure cycle (0–500, and 500–0 psi) and after eight pressure cycles. [Work supported by ONR, code 334.]
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