Structural engineering with NiTi . II / Jason McCormick in Journal of engineering mechanics, Vol. 133 N°9 (Septembre 2007)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 133 N°9 (Septembre 2007) . - pp.1019–1029. Titre : Structural engineering with NiTi . II : mechanical behavior and scaling Type de document : texte imprimé Auteurs : Jason McCormick, Auteur ; Jeff Tyber, Auteur ; Reginald DesRoches, Auteur Année de publication : 2007 Article en page(s) : pp.1019–1029. Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Shape memory effect, Structures, Material tests, properties Mechanical Cyclic tests Earthquake engineering Résumé : This paper continues to address the overarching goal to provide a more unified understanding of NiTi shape memory alloys intended for use in structural applications by attempting to link standard processing practice and basic materials characterization to the deformation behavior of large diameter bars. Results from cyclic tensile tests performed on large diameter Ni-rich polycrystalline NiTi bars are presented. Coupon specimens taken from deformation processed bars with diameters of 12.7, 19.1, and 31.8mm are tested along with their respective full-scale specimens. The coupon tests results reveal small and highly variable differences between specimens taken from the different size bars. The full-scale specimen tests continue to show the presence of the R phase, but lack a Lüders-like transformation. A comparison of the results suggests that coupon specimens provide only limited information in terms of the full-scale behavior. Full-scale tests using an earthquake-type loading then show similar behavior to the tensile cyclic tests suggesting the ability to use NiTi in structural applications. Overall, this paper and Tyber et al. 2007 provide a multiscale analysis of NiTi shape memory alloys to be used by both material scientist and civil engineers in the development of applications for NiTi. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=1019&volume=133&issue=9&journalC [...] [article] Structural engineering with NiTi . II : mechanical behavior and scaling [texte imprimé] / Jason McCormick, Auteur ; Jeff Tyber, Auteur ; Reginald DesRoches, Auteur . - 2007 . - pp.1019–1029. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°9 (Septembre 2007) . - pp.1019–1029. Mots-clés : Shape memory effect, Structures, Material tests, properties Mechanical Cyclic tests Earthquake engineering Résumé : This paper continues to address the overarching goal to provide a more unified understanding of NiTi shape memory alloys intended for use in structural applications by attempting to link standard processing practice and basic materials characterization to the deformation behavior of large diameter bars. Results from cyclic tensile tests performed on large diameter Ni-rich polycrystalline NiTi bars are presented. Coupon specimens taken from deformation processed bars with diameters of 12.7, 19.1, and 31.8mm are tested along with their respective full-scale specimens. The coupon tests results reveal small and highly variable differences between specimens taken from the different size bars. The full-scale specimen tests continue to show the presence of the R phase, but lack a Lüders-like transformation. A comparison of the results suggests that coupon specimens provide only limited information in terms of the full-scale behavior. Full-scale tests using an earthquake-type loading then show similar behavior to the tensile cyclic tests suggesting the ability to use NiTi in structural applications. Overall, this paper and Tyber et al. 2007 provide a multiscale analysis of NiTi shape memory alloys to be used by both material scientist and civil engineers in the development of applications for NiTi. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=1019&volume=133&issue=9&journalC [...]

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