Application of the viscoelastic continuum damage model to the indirect tension test at a single temperature / Jaeseung Kim in Journal of engineering mechanics, Vol. 136 N° 4 (Avril 2010)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 136 N° 4 (Avril 2010) . - pp. 496-505 Titre : Application of the viscoelastic continuum damage model to the indirect tension test at a single temperature Type de document : texte imprimé Auteurs : Jaeseung Kim, Auteur ; Randy C. West, Auteur Article en page(s) : pp. 496-505 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Asphalts Mixtures Poisson ratio Viscoelasticity Cyclic tests Biaxial Stiffness Tensile strength Damage Temperature effects. Résumé : The viscoelastic continuum damage model, developed based on Schapery's correspondence principle and the continuum damage mechanics, has received a great deal of attention because of its mathematical soundness and effectiveness in describing damage growth in viscoelastic media and has been used to make reliable estimations on the fatigue lives of asphalt mixtures. Its applications to field mixtures, however, have been limited because the model requires performing the uniaxial tension test. As an alternative, this study developed an analytical methodology for applying the model to the indirect tension test, which has been successfully used in testing both laboratory-made and field-cored mixtures. From the results of the indirect tension tests conducted on asphalt mixture at three different crosshead-controlled rates, it was found that the stress-pseudostrain curves could be superimposed onto one equality line in the linear viscoelastic range of the given mixture, and its rate dependency was successfully eliminated in the C1 and S1 plots. This indicates that the methodology developed for the indirect tension test has a capability of evaluating damage development in asphalt mixtures through the viscoelastic continuum damage model. It would be potentially of great benefit to pavement engineers who want to estimate the remaining lives of field mixtures. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=ASCERL&smode=strres [...] [article] Application of the viscoelastic continuum damage model to the indirect tension test at a single temperature [texte imprimé] / Jaeseung Kim, Auteur ; Randy C. West, Auteur . - pp. 496-505. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 4 (Avril 2010) . - pp. 496-505 Mots-clés : Asphalts Mixtures Poisson ratio Viscoelasticity Cyclic tests Biaxial Stiffness Tensile strength Damage Temperature effects. Résumé : The viscoelastic continuum damage model, developed based on Schapery's correspondence principle and the continuum damage mechanics, has received a great deal of attention because of its mathematical soundness and effectiveness in describing damage growth in viscoelastic media and has been used to make reliable estimations on the fatigue lives of asphalt mixtures. Its applications to field mixtures, however, have been limited because the model requires performing the uniaxial tension test. As an alternative, this study developed an analytical methodology for applying the model to the indirect tension test, which has been successfully used in testing both laboratory-made and field-cored mixtures. From the results of the indirect tension tests conducted on asphalt mixture at three different crosshead-controlled rates, it was found that the stress-pseudostrain curves could be superimposed onto one equality line in the linear viscoelastic range of the given mixture, and its rate dependency was successfully eliminated in the C1 and S1 plots. This indicates that the methodology developed for the indirect tension test has a capability of evaluating damage development in asphalt mixtures through the viscoelastic continuum damage model. It would be potentially of great benefit to pavement engineers who want to estimate the remaining lives of field mixtures. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=ASCERL&smode=strres [...]

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General realization algorithm for modal identification of linear dynamic systems / R. A. De Callafon in Journal of engineering mechanics, Vol. 134 n°9 (Septembre 2008)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 134 n°9 (Septembre 2008) . - pp.496–505. Titre : General realization algorithm for modal identification of linear dynamic systems Type de document : texte imprimé Auteurs : R. A. De Callafon, Auteur ; Randy C. West, Auteur Année de publication : 2008 Article en page(s) : pp.496–505. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Modal analysis Linear systems Earthquakes Algorithms Dynamic loads Résumé : The general realization algorithm (GRA) is developed to identify modal parameters of linear multi-degree-of-freedom dynamic systems subjected to measured (known) arbitrary dynamic loading from known initial conditions. The GRA extends the well known eigensystem realization algorithm (ERA) based on Hankel matrix decomposition by allowing an arbitrary input signal in the realization algorithm. This generalization is obtained by performing a weighted Hankel matrix decomposition, where the weighting is determined by the loading. The state-space matrices are identified in a two-step procedure that includes a state reconstruction followed by a least-squares optimization to get the minimum prediction error for the response. The statistical properties (i.e., bias, variance, and robustness to added output noise introduced to model measurement noise and modeling errors) of the modal parameter estimators provided by the GRA are investigated through numerical simulation based on a benchmark problem with nonclassical damping. ISSN : 0733-9399 En ligne : Modal analysis, Linear systems, Earthquakes, Algorithms, Dynamic loads Read More [...] [article] General realization algorithm for modal identification of linear dynamic systems [texte imprimé] / R. A. De Callafon, Auteur ; Randy C. West, Auteur . - 2008 . - pp.496–505. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 n°9 (Septembre 2008) . - pp.496–505. Mots-clés : Modal analysis Linear systems Earthquakes Algorithms Dynamic loads Résumé : The general realization algorithm (GRA) is developed to identify modal parameters of linear multi-degree-of-freedom dynamic systems subjected to measured (known) arbitrary dynamic loading from known initial conditions. The GRA extends the well known eigensystem realization algorithm (ERA) based on Hankel matrix decomposition by allowing an arbitrary input signal in the realization algorithm. This generalization is obtained by performing a weighted Hankel matrix decomposition, where the weighting is determined by the loading. The state-space matrices are identified in a two-step procedure that includes a state reconstruction followed by a least-squares optimization to get the minimum prediction error for the response. The statistical properties (i.e., bias, variance, and robustness to added output noise introduced to model measurement noise and modeling errors) of the modal parameter estimators provided by the GRA are investigated through numerical simulation based on a benchmark problem with nonclassical damping. ISSN : 0733-9399 En ligne : Modal analysis, Linear systems, Earthquakes, Algorithms, Dynamic loads Read More [...]

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