Material Property Characterization of Foilback Damping Treatments Using Modified ASTM Equations

2003-01-1585

05/05/2003

Event
SAE 2003 Noise & Vibration Conference and Exhibition
Authors Abstract
Content
In the automotive industry, in order to characterize and evaluate damping treatments, it is a common practice to employ Oberst bar tests as specified by ASTM E756 and SAE J1637. The ASTM standard provides equations for sandwiched Oberst bars. These equations allow engineers to extract the properties of the visco-elastic core. For certain type of automotive constrained-layer damping treatments, such as the Aluminum Foilback, it is often convenient and desirable to prepare the Oberst bar samples with production-intent configuration. Unfortunately, these configurations are often asymmetric. Therefore, the composite Oberst bar data cannot be post-processed by employing the ASTM equations. In this study, the ASTM equations for sandwiched bars are modified to accommodate for asymmetric Oberst bar configurations. The finite element method is used to validate the derived equations by performing a “Virtual Oberst Bar test.” The post-processed Material properties of the visco-elastic core are compared to that of the visco-elastic layer originally defined in the finite element model. Results indicate that the derived equations can produce quite reliable values.
Meta TagsDetails
DOI
https://doi.org/10.4271/2003-01-1585
Pages
8
Citation
Akanda, A., and Onsay, T., "Material Property Characterization of Foilback Damping Treatments Using Modified ASTM Equations," SAE Technical Paper 2003-01-1585, 2003, https://doi.org/10.4271/2003-01-1585.
Additional Details
Publisher
Published
May 5, 2003
Product Code
2003-01-1585
Content Type
Technical Paper
Language
English