Modeling the high-frequency complex modulus of a silicone rubber using standing lamb waves and an inverse finite element method
2014 (English)In: IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, ISSN 0885-3010, E-ISSN 1525-8955, Vol. 61, no 12, 2106-2120 p.Article in journal (Other academic) Published
To gain an understanding of the high-frequency elastic properties of silicone rubber, a finite element model of a cylindrical piezoelectric element, in contact with a silicone rubber disk, was constructed. The frequency dependent elastic modulus of the silicone rubber was modeled by a four parameter fractional derivative viscoelastic model in the 100 kHz to 250 kHz frequency range. The calculations were carried out in the range of the first radial resonance frequency of the sensor. At the resonance, the hyperelastic effect of the silicone rubber was modeled by a hyperelastic compensating function. The calculated response was matched to the measured response by using the transitional peaks in the impedance spectrum that originates from the switching of standing Lamb wave modes in the silicone rubber. To validate the results, the impedance responses of three 5 mm thick silicone rubber disks, with different radial lengths, were measured. The calculated and measured transitional frequencies have been compared in detail. The comparison showed very good agreement, with average relative differences of 0.7 %, 0.6 %, and 0.7 % for the silicone rubber samples with radial lengths of 38.0 mm, 21.4 mm, and 11.0 mm, respectively. The average, complex, elastic modulus of the samples were: (0.97 + 0.009i) GPa at 100 kHz and (0.97 + 0.005i) GPa at 250 kHz.
Place, publisher, year, edition, pages
IEEE Press, 2014. Vol. 61, no 12, 2106-2120 p.
piezoelectric, silicone rubber, impedance, resonance, lamb waves, phantom
Medical Laboratory and Measurements Technologies Electrical Engineering, Electronic Engineering, Information Engineering Fluid Mechanics and Acoustics
Research subject Electronics
IdentifiersURN: urn:nbn:se:umu:diva-88214DOI: 10.1109/TUFFC.2014.006471ISI: 000345944300017OAI: oai:DiVA.org:umu-88214DiVA: diva2:714397