Journal
ACTA MATERIALIA
Volume 59, Issue 13, Pages 5238-5249Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.04.063
Keywords
Shape memory alloys; Thermal cycling; Finite element
Funding
- NASA [NNX08AB49A, NNX08AB51A]
- Department of Energy [DE-SC0001258]
- Ohio Supercomputer Center [PAS676]
- Florida Center for Advanced Aeropropulsion
- NASA [103519, NNX08AB49A, NNX08AB51A, 103433] Funding Source: Federal RePORTER
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A recent microstructure-based FEM model that couples crystal-based plasticity, the B2 <-> B19' phase transformation and anisotropic elasticity at the grain scale is calibrated to recent data for polycrystalline NiTi (49.9 at.% Ni). Inputs include anisotropic elastic properties, texture and differential scanning calorimetry data, as well as a subset of recent isothermal deformation and load-biased thermal cycling data. The model is assessed against additional experimental data. Several experimental trends are captured - in particular, the transformation strain during thermal cycling monotonically increases and reaches a peak with increasing bias stress. This is achieved, in part, by modifying the martensite hardening matrix proposed by Patoor et al. [Patoor E, Eberhardt A, Berveiller M. J Phys IV 1996;6:277]. Some experimental trends are underestimated - in particular, the ratcheting of macrostrain during thermal cycling. This may reflect a model limitation that transformation plasticity coupling is captured on a coarse (grain) scale but not on a fine (martensitic plate) scale. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
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