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New analytical model for composite materials containing local resonance units / Zhang Bo in Journal of engineering mechanics, Vol. 137 N° 1 (Janvier 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.1-7 Titre : New analytical model for composite materials containing local resonance units Type de document : texte imprimé Auteurs : Zhang Bo, Auteur ; Zongjin Li, Auteur Année de publication : 2011 Article en page(s) : pp.1-7 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Density  Resonance  Composite  materials  Vibration  Stiffness. Résumé : 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. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p1_s1?isAuthorized=no [article] New analytical model for composite materials containing local resonance units [texte imprimé] / Zhang Bo, Auteur ; Zongjin Li, Auteur . - 2011 . - pp.1-7. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.1-7 Mots-clés : Density  Resonance  Composite  materials  Vibration  Stiffness. Résumé : 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. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p1_s1?isAuthorized=no