NiTi-based SMAs for self-post-tensioned bridge girders

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The localized strain fields during the tensile stress-induced martensitic transformation (MT) in NiTiNb wide-hysteresis shape memory alloys (SMAs) are studied. NiTiNb alloys are a class of SMAs that exhibit a wide temperature hysteresis required for practical application. Previous investigators embedded Nitinol (NiTi) wires into concrete. The temperature hysteresis of NiTi (∼30 °C) is unsuitable for practical self-post tensioned bridge-girder applications. With the addition of Nb, the hysteresis can be widened up to (∼145 °C) [6]. The effects of Nb are attributed to the dispersion of a Nb rich second phase with the NiTi matrix. We hypothesize that by controlling the Nb content we can design microstructures and tailor NiTiNb for service temperature requirements. This work represents the initial thermo-mechanical experimentation towards an understanding of the relationship between the material response and the underlying MT morphology. For a commercial NiTiNb, we interpret the MT morphology, in-situ, based on full-field deformation and strain measurements obtained using DIC. To elucidate the influence of Nb, the results are contrast with those for a binary NiTi SMA.

Original languageEnglish (US)
Title of host publication28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
Pages1640-1649
Number of pages10
StatePublished - Dec 1 2013
Event28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013 - State College, PA, United States
Duration: Sep 9 2013Sep 11 2013

Publication series

Name28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
Volume2

Other

Other28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013
CountryUnited States
CityState College, PA
Period9/9/139/11/13

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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  • Cite this

    Lanba, A., & Hamilton, R. F. (2013). NiTi-based SMAs for self-post-tensioned bridge girders. In 28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013 (pp. 1640-1649). (28th Annual Technical Conference of the American Society for Composites 2013, ASC 2013; Vol. 2).