The stress-strain relationship of visco-elastic materials, generally used in the damping treatment of structures, can be described by two properties, such as the perfectly elastic (in-phase) stress-strain modulus and the loss factor. The values of these properties need to be determined in tension or compression for materials used as unconstrained damping layers and as anti-vibration mountings under machinery and under foundation blocks.Using a dual channel FFT analyzer, the specimen can be excited using wide band random excitation, and the properties determined from the frequency response spectra, as a continuous function of frequency, as shown in the following.Another possibility is to preload the specimen by a well-known mass, such that the preloaded damping material becomes a part of a resonant mass-spring-damper system. Damping, e.g. loss factor, is then determined from the 3 dB bandwidth of the resonance. The procedure is then repeated at different frequencies of the specimen using different mass-loadings.The two methods are demonstrated and compared in this article.


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    Titel :

    Complex Modulus and Damping Measurements Using Resonant and Non-Resonant Methods


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Herlufsen, H. (Autor:in) / Konstantin-Hansen, H. (Autor:in) / Zaveri, K. (Autor:in) / Gade, S. (Autor:in)

    Kongress:

    SAE Noise and Vibration Conference and Exposition ; 1995



    Erscheinungsdatum :

    01.05.1995




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


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