A constitutive model for high temperature SMAs exhibiting viscoplastic behavior Conference Paper uri icon

abstract

  • In this work a 1-D constitutive model for high temperature shape memory alloys (HTSMA's) is presented, where the range of operating temperatures allows the appearance of creep mechanisms during transformation. The model aims to capture the coupled phenomenon, where the rate independent transformation and the rate dependent viscoplastic behavior coexist. Based on continuum thermodynamics, the Gibbs free energy and the evolution equations for forward, reverse transformation and creep are properly chosen. The generation of time independent irrecoverable strains during transformation is also taken into account. The calibration and validation of the model in the 1-D case is achieved with the help of experimental tests in Ti50Pd40Ni10, including isobaric tests at selected stress levels with 2 different temperature rates. 2009 SPIE.

name of conference

  • SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring

published proceedings

  • SPIE Proceedings

author list (cited authors)

  • Chatzigeorgiou, G. E., & Lagoudas, D. C.

editor list (cited editors)

  • Ounaies, Z., & Li, J.

publication date

  • January 1, 2009 11:11 AM

publisher