Thermodynamics and thermal decomposition for shape memory effects with crystallization based on dissipation and logarithmic strain

R. B. Hall, I. J. Rao, H. J. Qi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The present effort provides a 3-D thermodynamic framework generalizing the 1-D modeling of 2-way shape memory materials described by Westbrook et al. (J. Eng. Mater. Technol. 312:041010, 2010) and Chung et al. (Macromolecules 41:184-192, 2008), while extending the strain-induced crystallization and shape memory approaches of Rao and Rajagopal (Interfaces Free Bound. 2:73-94, 2000; Int. J. Solids Struct. 38:1149-1167, 2001), Barot and Rao (Z. Angew. Math. Phys. 57:652-681, 2006), and Barot et al. (Int. J. Eng. Sci. 46:325-351, 2008) to include finite thermal expansion within a logarithmic strain basis. The free energy of newly-formed orthotropic crystallites is assumed additive, with no strains in their respective configurations of formation. A multiplicative decomposition is assumed for the assumed thermoelastic orthotropic expansional strains of the respective crystallites. The properties of the crystallites are allowed to depend both on current temperature and their respective temperatures of formation. The entropy production rate relation is written in the frame rotating with the logarithmic spin and produces stress and entropy relations incorporating the integrated configurational free energies, and a driving term for the crystallization analogous to that obtained by the previous studies of Rao et al. The salient attributes of the 1-D modeling of Westbrook et al. are recovered, and applications are discussed.

Original languageEnglish (US)
Pages (from-to)437-452
Number of pages16
JournalMechanics of Time-Dependent Materials
Volume18
Issue number2
DOIs
StatePublished - May 2014

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanical Engineering

Keywords

  • Crystallization
  • Dissipation
  • Logarithmic rate
  • Logarithmic strain
  • Shape memory

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