Equivalent Material Properties of Multi-Layer, Lightweight, High-Performance Damping Material and Its Performance in Applications
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Abstract
In this study, we investigated two aspects of a multi-layer, lightweight damping treatment. The first aspect studied was an equivalent material property estimate for a simplified finite element (FE) model. The simplified model is needed for computational efficiency, i.e. so that Tier 1 and OEM users can represent this complex, multi-layer treatment as a single, isotropic solid layer plus an aluminum constraining layer. Therefore, the use of this simplified FE model allows the multilayer treatment to be included in large body-in-white structural models. An equivalent material property was identified by first representing three unique layers (two adhesive layers plus a connecting standoff layer) by a single row of isotropic solid elements, then an optimization tool was used to determine the “best fit” for two properties including Young’s modulus and material loss factor. Equivalent properties were validated for various substrate thickness and coverage areas heights by comparison to center-driven long bar test results.
Secondly, the effect of damping treatment size was studied using the previously identified equivalent material properties. This was a damper placement study to determine if a smaller, higher performing damping patch can perform as well as a larger, lower performing patch. The multi-layer damping material produces high system loss factors and it was therefore expected to perform similarly to a larger, lower performing treatment. The study showed that there is a geometry dependency for performance and also showed that performance does not strictly scale with material loss factor and treatment area. It is possible that two different treatments will produce similar damping - one with high material loss factor, small treatment area and the other with lower material loss factor and a larger area. However, achieving good results with a smaller treatment area requires knowledge of the structural modes and proper placement of the treatment.
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Citation
Yoo, T., Eichhorn, G., Gerdes, R., Lee, S. et al., "Equivalent Material Properties of Multi-Layer, Lightweight, High-Performance Damping Material and Its Performance in Applications," SAE Technical Paper 2019-01-1573, 2019, https://doi.org/10.4271/2019-01-1573.Data Sets - Support Documents
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References
- Yoo, T., Gerdes, R., Lee, S., Stanley, D. et al. , “Comparison of Long Bar Test Method to Oberst Bar Test Method for Damping Material Evaluation,” SAE Technical Paper 2017-01-1851, 2017, doi:10.4271/2017-01-1851.
- Lee, S., Yoo, T., Gerdes, R.W., Hanschen, T.P. et al. , “Lightweight, Flexible Damping Treatment Using a Kinetic Spacer,” in Inter-Noise 2018, USA, Aug. 26-29, 2018.
- Nashif, A.D., Jones, D.I.G., and Henderson, J.P. , Vibration Damping (New York: John Wiley & Sons, 1985). ISBN:0-471-86772-1.
- Grellman, G. and Seidler, S. , Polymer testing (Munich: Hanser Publications, 2007). ISBN:978-1569904107.
- Stanley, D.R. , “Alternative Method of Measuring System Loss Factor,” in Noise-Con 2014, USA, September 8-10, 2014.
- Japanese Industrial Standard (JIS) G 0602, “Test Methods For Vibration-Damping Property in Laminated Damping Steel Sheets of Constrained Type.”
- The International Organization for Standardization (ISO) 16940: “Glass in Building - Glazing and Airborne Sound Insulation - Measurement of the Mechanical Impedance of Laminated Glass.”
- Dowling, J.M. and Saha, P. , “A Correlation between Oberst Bar and Center Point Damping Results,” SAE Technical Paper 2009-01-2134, 2009, doi:10.4271/2009-01-2134.