Abstract
Obtaining broadband dynamic mechanical properties of viscoelastic materials is challenging. Commercially available characterization equipment is typically limited to about 500 Hz. Ultrasonic testing is a common strategy but requires time-temperature superposition extrapolation to audible frequencies. These techniques are indirect and sensitive to inhomogeneities. Modal methods do not yield broadband data and can fail for materials with high loss factors. A new relatively simple characterization method, relying on bending wave excitation and laser Doppler vibrometer measurement, is proposed. Complex elastic moduli and phase speeds are now attainable over the entire range of building acoustics frequencies. The materials under test are an array of polyurea aerogels with fixed chemical composition but tailorable nanomorphologies. Low cost and ease of synthesis add appeal to materials already noted for their sound transmission loss performance [4].
Recommended Citation
M. Miller et al., "Bending Wave Based Characterization of Viscoelastic Materials," Proceedings of the International Congress on Acoustics, pp. 1318 - 1322, RWTH Publications, Jan 2019.
The definitive version is available at https://doi.org/10.18154/RWTH-CONV-239499
Department(s)
Chemistry
Publication Status
Open Access
Keywords and Phrases
Bending; Characterization; Damping; Flexural; Transmission
International Standard Book Number (ISBN)
978-393929615-7
International Standard Serial Number (ISSN)
2415-1599; 2226-7808
Document Type
Article - Conference proceedings
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 RWTH Publications, All rights reserved.
Publication Date
01 Jan 2019
Comments
National Science Foundation, Grant 1636306/1661246/172043