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Stretch – stress behavior of elastomeric seismic isolators with different rubber materials / G. Milani in Journal of engineering mechanics, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 5 (Mai 2012) . - pp.416-429 Titre : Stretch – stress behavior of elastomeric seismic isolators with different rubber materials : Numerical insight Type de document : texte imprimé Auteurs : G. Milani, Auteur ; F. Milani, Auteur Année de publication : 2012 Article en page(s) : pp.416-429 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Isolators  Rubber  typology  Compounds  performance  Stretch-strain  behavior  under  large  deformations  Numerical  model  simulations  Finite-element  method Résumé : This study presents a numerical approach to predict the macroscopic behavior of parallelepiped elastomeric isolators undergoing large deformations. The model uses experimental data fitting performed through cubic splines on several rubber compounds. A nine-constant Mooney-Rivlin model and an exponential law proposed in previous studies are assumed to evaluate the energy density of the rubber pads within a finite-element discretization of the isolator. Having a few experimental stretch-stress data for each rubber compound in uniaxial tension and/or shear, cubic Bezier splines are utilized to generate a large number of data (or metadata) containing the original experimental data. The Mooney-Rivlin and exponential law constitutive parameters are estimated through the least squares method, assuming spline interpolations as data to fit. The uniaxial and shear response of each rubber compound are numerically compared and, when possible, their capability in reproducing experimental data is assessed. Full-scale rectangular seismic isolators are analyzed. The compression modulus, Ec, the shear-large displacement curves, and the hysteretic behavior are estimated. For hysteretic behavior, the model is compared with existing experimental data by modeling rubber with a recently presented overlay viscoplastic model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000340 [article] Stretch – stress behavior of elastomeric seismic isolators with different rubber materials : Numerical insight [texte imprimé] / G. Milani, Auteur ; F. Milani, Auteur . - 2012 . - pp.416-429. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 5 (Mai 2012) . - pp.416-429 Mots-clés : Isolators  Rubber  typology  Compounds  performance  Stretch-strain  behavior  under  large  deformations  Numerical  model  simulations  Finite-element  method Résumé : This study presents a numerical approach to predict the macroscopic behavior of parallelepiped elastomeric isolators undergoing large deformations. The model uses experimental data fitting performed through cubic splines on several rubber compounds. A nine-constant Mooney-Rivlin model and an exponential law proposed in previous studies are assumed to evaluate the energy density of the rubber pads within a finite-element discretization of the isolator. Having a few experimental stretch-stress data for each rubber compound in uniaxial tension and/or shear, cubic Bezier splines are utilized to generate a large number of data (or metadata) containing the original experimental data. The Mooney-Rivlin and exponential law constitutive parameters are estimated through the least squares method, assuming spline interpolations as data to fit. The uniaxial and shear response of each rubber compound are numerically compared and, when possible, their capability in reproducing experimental data is assessed. Full-scale rectangular seismic isolators are analyzed. The compression modulus, Ec, the shear-large displacement curves, and the hysteretic behavior are estimated. For hysteretic behavior, the model is compared with existing experimental data by modeling rubber with a recently presented overlay viscoplastic model. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000340