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Modeling of NiTiHf using finite difference method
Author(s): Nazanin Farjam; Reza Mehrabi; Haluk Karaca; Reza Mirzaeifar; Mohammad Elahinia
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Paper Abstract

NiTiHf is a high temperature and high strength shape memory alloy with transformation temperatures above 100oC. A constitutive model based on Gibbs free energy is developed to predict the behavior of this material. Two different irrecoverable strains including transformation induced plastic strain (TRIP) and viscoplastic strain (VP) are considered when using high temperature shape memory alloys (HTSMAs). The first one happens during transformation at high levels of stress and the second one is related to the creep which is rate-dependent. The developed model is implemented for NiTiHf under uniaxial loading. Finite difference method is utilized to solve the proposed equations. The material parameters in the equations are calibrated from experimental data. Simulation results are captured to investigate the superelastic behavior of NiTiHf. The extracted results are compared with experimental tests of isobaric heating and cooling at different levels of stress and also superelastic tests at different levels of temperature. More results are generated to investigate the capability of the proposed model in the prediction of the irrecoverable strain after full transformation in HTSMAs.

Paper Details

Date Published: 27 March 2018
PDF: 6 pages
Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 1059613 (27 March 2018); doi: 10.1117/12.2300857
Show Author Affiliations
Nazanin Farjam, The Univ. of Toledo (United States)
Reza Mehrabi, The Univ. of Toledo (United States)
Haluk Karaca, Univ. of Kentucky (United States)
Reza Mirzaeifar, Virginia Polytechnic Institute and State Univ. (United States)
Mohammad Elahinia, The Univ. of Toledo (United States)

Published in SPIE Proceedings Vol. 10596:
Behavior and Mechanics of Multifunctional Materials and Composites XII
Hani E. Naguib, Editor(s)

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