A thermodynamic constitutive model for gradual phase transformation of SMA materials Conference Paper uri icon


  • A thermally induced phase transformation in a Shape Memory Alloy (SMA) polycrystal occurs gradually over a range of temperatures unlike the first-order transition (at a single temperature) of a SMA monocrystal. This spread in transformation temperatures is believed to be caused by such factors as material inhomogeneities and internal stresses in the polycrystal. Taking a recently proposed thermodynamic model by Bo and Lagoudas for the Two-Way Memory Effect of SMA materials as a starting point, we extend it to account for the presence of initial heterogeneities, by introducing a statistical distribution in the Gibbs free energy function. The extended theory is then used as a basis to correlate strain recovery vs. temperature measurements from thermally induced cyclic phase transformation in untrained polycrystalline wires.

name of conference

  • Smart Structures and Materials 1996: Mathematics and Control in Smart Structures

published proceedings


author list (cited authors)

  • Lagoudas, D. C., Bo, Z., & Bhattacharyya, A.

citation count

  • 6

complete list of authors

  • Lagoudas, DC||Bo, Z||Bhattacharyya, A

editor list (cited editors)

  • Varadan, V. V., & Chandra, J.

publication date

  • January 1996