Thermodynamic Damping in Porous Materials with Spherical Cavities | Zendy

Sofia D. Panteliou | Zendy; Andrew D. Dimarogonas | Zendy

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Thermodynamic Damping in Porous Materials with Spherical Cavities

Author(s) -

Sofia D. Panteliou,

Andrew D. Dimarogonas

Publication year - 1997

Publication title -

shock and vibration

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.418

H-Index - 45

eISSN - 1875-9203

pISSN - 1070-9622

DOI - 10.1155/1997/138503

Subject(s) - thermoelastic damping , materials science , porosity , thermal conduction , isotropy , reciprocity (cultural anthropology) , loss factor , vibration , material properties , structural material , damping capacity , mechanics , composite material , thermodynamics , thermal , physics , dielectric , optics , psychology , social psychology , optoelectronics , quantum mechanics , alloy

When a material is subjected to an alternating stress field, there are temperature fluctuations throughout its volume due to the thermoelastic effect. The resulting irreversible heat conduction leads to entropy production that in turn is the cause of thermoelastic damping. An analytical investigation of the entropy produced during a vibration cycle due to the reciprocity of temperature rise and strain yielded the change of the material damping factor as a function of the porosity of the material. A homogeneous, isotropic, elastic bar of cylindrical shape is considered with uniformly distributed spherical cavities under alternating uniform axial stress. The analytical calculation of the dynamic characteristics of the porous structure yielded the damping factor of the bar and the material damping factor. Exsperimental results on porous metals are in good correlation with an analysis.

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