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Characterization and modeling of ductile damage in structural steel at low and intermediate strain rates / Farid H. Abed in Journal of engineering mechanics, Vol. 138 N° 9 (Septembre 2012) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1186–1194. Titre : Characterization and modeling of ductile damage in structural steel at low and intermediate strain rates Type de document : texte imprimé Auteurs : Farid H. Abed, Auteur ; Adil K. Al-Tamimi, Auteur ; Reem M. Al-Himairee, Auteur Année de publication : 2012 Article en page(s) : pp.1186–1194. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : CDM  Strain  rate  Ductile  damage  Steel  SEM Résumé : In this research, the concept of continuum damage mechanics (CDM) was implemented to evaluate damage initiation and evolution in structural steel rebars at low and intermediate loading rates. The work was divided into experimental and theoretical phases to evaluate the ductile damage behavior. The experimental part involved uniaxial tensile tests for steel bars at the ambient temperature over a range of strain rates between 3.0×10−4 and 0.1 s−1. Scanning electron microscopy (SEM), coupled with image processing techniques, was utilized to characterize the damage at several loading stages. The theoretical part of this paper introduced a new energy-based isotropic damage model capable of capturing the evolution of damage throughout the deformation process. The proposed damage model was verified via comparisons with the present SEM results and with other data available in the literature. The comparisons showed good agreement, and results from both approaches indicated that cracks and voids intensified significantly with the increase of plastic strain and strain rates. Results proved that the new procedure was satisfactory for damage characterization and offered good simplifications. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000415 [article] Characterization and modeling of ductile damage in structural steel at low and intermediate strain rates [texte imprimé] / Farid H. Abed, Auteur ; Adil K. Al-Tamimi, Auteur ; Reem M. Al-Himairee, Auteur . - 2012 . - pp.1186–1194. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 9 (Septembre 2012) . - pp.1186–1194. Mots-clés : CDM  Strain  rate  Ductile  damage  Steel  SEM Résumé : In this research, the concept of continuum damage mechanics (CDM) was implemented to evaluate damage initiation and evolution in structural steel rebars at low and intermediate loading rates. The work was divided into experimental and theoretical phases to evaluate the ductile damage behavior. The experimental part involved uniaxial tensile tests for steel bars at the ambient temperature over a range of strain rates between 3.0×10−4 and 0.1 s−1. Scanning electron microscopy (SEM), coupled with image processing techniques, was utilized to characterize the damage at several loading stages. The theoretical part of this paper introduced a new energy-based isotropic damage model capable of capturing the evolution of damage throughout the deformation process. The proposed damage model was verified via comparisons with the present SEM results and with other data available in the literature. The comparisons showed good agreement, and results from both approaches indicated that cracks and voids intensified significantly with the increase of plastic strain and strain rates. Results proved that the new procedure was satisfactory for damage characterization and offered good simplifications. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000415