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2015 | 127 | 4 | 1251-1254
Article title

Characterization of Viscoelastic Materials Using Free-Layered and Sandwiched Samples: Assessment and Recommendations

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EN
Abstracts
EN
Viscoelastic materials are widely used in many applications in practice. However, determination of the elastic and damping properties of these materials is quite difficult in the sense that the identified results may contain high degree of uncertainty. The characterization of viscoelastic materials using the Oberst beam method, based on non-contact excitation and response measurements, is revisited in this paper. The effects of signal processing parameters such as frequency resolution in Frequency Response Function (FRF) measurements, as well as the effects of various single-degree-of-freedom modal analysis methods, including circle-fit, half-power and line-fit are investigated first. Then, the modal loss factors, Young's modulus and shear modulus of some sample viscoelastic materials are identified using both the free-layered and sandwiched samples. The results obtained from different tests are compared, discussed and some recommendations are made so as to identify the damping and elastic properties of typical viscoelastic materials with better accuracy. Analyses of a large number of FRF measurements show that the selection of the appropriate signal processing parameters and the use of appropriate modal analysis method can be very significant during the identification of viscoelastic materials. By following the approach presented in this paper, the damping and elastic properties of viscoelastic materials can be identified with better accuracy using either free-layered or sandwiched samples. The material properties obtained by this approach can be used for developing valid structural models and/or for damping optimization purposes.
Keywords
EN
Year
Volume
127
Issue
4
Pages
1251-1254
Physical description
Dates
published
2015-04
References
  • [1] ASTM E756-05, Standard Test Method for Measuring Vibration-Damping Properties of Materials, American Society for Testing Materials, 2005, doi: 10.1520/E0756-05R10
  • [2] SAE J1637, Laboratory Measurement of the Composite Vibration Damping Properties of Materials on a Supporting Steel Bar, SAE International, 1993
  • [3] H. Koruk, K.Y. Sanliturk, On Measuring Dynamic Properties of Damping Materials Using Oberst Beam Method, ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Istanbul, Turkey, 2010, doi: 10.1115/ESDA2010-24452
  • [4] H. Koruk, K.Y. Sanliturk, Mech. Syst. Signal Pr. 30, 274 (2012), doi: 10.1016/j.ymssp.2012.02.003
  • [5] H. Koruk, K.Y. Sanliturk, Modelling Electromagnetic Effect of The Non-Contact Excitation System in Oberst Beam Method, Inter-Noise 2013: The 42nd International Congress and Exposition on Noise Control Engineering, Paper no: 1261, Innsbruck, Austria, 15-18 September, 2013
  • [6] D.J. Ewins, Modal Testing: Theory, Practice and Application, Second Edition, Research Studies Press, Hertfordshire, 2000
  • [7] ICATS: Imperial College Testing Analysis and Software, Imperial Collage London, Dynamic Section, London, 2009
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv127n4109kz
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