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Modeling Of Nitihf Using Finite Difference Method, Nazanin Farjam, Reza Mehrabi, Haluk E. Karaca, Reza Mirzaeifar, Mohammad Elahinia
Modeling Of Nitihf Using Finite Difference Method, Nazanin Farjam, Reza Mehrabi, Haluk E. Karaca, Reza Mirzaeifar, Mohammad Elahinia
Mechanical Engineering Faculty Publications
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. …