Damping material for automotive structures is often quantified in terms of composite loss factor or damping ratio by using ASTM/SAE beam or modal tests. Simplified expressions have also been used to estimate certain material properties. However, none of these tests provide any information on the properties of viscoelastic core material such as rubber or adhesive in practical structures. To overcome this deficiency, a refined estimation procedure is proposed. A new sandwich beam model has been developed which describes all layers of an arbitrarily applied damping patch. By using both analytical predictions and modal experiments on a cantilever beam, spectrally-varying loss factor and shear modulus of the unknown core are determined.


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    Title :

    Determination of Viscoelastic Core Material Properties Using Sandwich Beam Theory and Modal Experiments


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Noise & Vibration Conference & Exposition ; 1999



    Publication date :

    1999-05-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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