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    New Analytical Model for Composite Materials Containing Local Resonance Units

    Source: Journal of Engineering Mechanics:;2011:;Volume ( 137 ):;issue: 001
    Author:
    Zhang Bo
    ,
    Zongjin Li
    DOI: 10.1061/(ASCE)EM.1943-7889.0000195
    Publisher: American Society of Civil Engineers
    Abstract: In this research, a new approach has been developed to calculate the effective mass density for a composite containing local resonance units consisting of a hard sphere core, a soft shell layer surrounding, and a stiff host medium. The composite has been developed as low-frequency sound shielding material. Different from the model in the original paper based on wave propagation theory, the new approach is based on vibration theory. The natural frequency of local resonance unit is calculated, and then the composite behavior under harmonic load is investigated. It is shown that the effective mass density of the composite can turn to negative and infinitely close to the local resonance. In order to examine the influence of important parameters on the resonant frequency and effective mass density, a parametric study has been carried out. It is found that a thicker soft layer with smaller modules can lead to lower resonant frequency. The predictions of wave spectral gap from the new approach and from the model in the literature are almost identical.
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      New Analytical Model for Composite Materials Containing Local Resonance Units

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    http://yetl.yabesh.ir/yetl1/handle/yetl/60652
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    contributor authorZhang Bo
    contributor authorZongjin Li
    date accessioned2017-05-08T21:43:25Z
    date available2017-05-08T21:43:25Z
    date copyrightJanuary 2011
    date issued2011
    identifier other%28asce%29em%2E1943-7889%2E0000205.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/60652
    description abstractIn this research, a new approach has been developed to calculate the effective mass density for a composite containing local resonance units consisting of a hard sphere core, a soft shell layer surrounding, and a stiff host medium. The composite has been developed as low-frequency sound shielding material. Different from the model in the original paper based on wave propagation theory, the new approach is based on vibration theory. The natural frequency of local resonance unit is calculated, and then the composite behavior under harmonic load is investigated. It is shown that the effective mass density of the composite can turn to negative and infinitely close to the local resonance. In order to examine the influence of important parameters on the resonant frequency and effective mass density, a parametric study has been carried out. It is found that a thicker soft layer with smaller modules can lead to lower resonant frequency. The predictions of wave spectral gap from the new approach and from the model in the literature are almost identical.
    publisherAmerican Society of Civil Engineers
    titleNew Analytical Model for Composite Materials Containing Local Resonance Units
    typeJournal Paper
    journal volume137
    journal issue1
    journal titleJournal of Engineering Mechanics
    identifier doi10.1061/(ASCE)EM.1943-7889.0000195
    treeJournal of Engineering Mechanics:;2011:;Volume ( 137 ):;issue: 001
    contenttypeFulltext
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