SMA Constitutive Modeling Backed Up by 3D-XRD Experiments: Transformation Front in Stretched NiTi Wire
- 180 Downloads
It has been known for a long time that martensitic phase transformation in NiTi shape memory alloys loaded in tension develops inhomogeneously via formation and propagation of macroscopic deformation bands resembling well-known Lüders bands. Growing literature evidence supports the view that NiTi, in fact, develops a variety of localized deformation phenomena in particular geometries and loading modes. Coupling of cutting-edge experimental methods with dedicated modeling techniques can bring new insight into such a type of behavior. In this short review of our recent study, we demonstrate this synergic approach on the investigation of the martensite band in a stretched NiTi superelastic wire, in which the advanced technique of three-dimensional X-ray diffraction was complemented by NiTi-tailored constitutive model. We focus mainly on the modeling part, but the experimental background motivating and validating the chosen numerical approach is also briefly presented.
KeywordsConstitutive model Localized deformation Numerical simulation NiTi 3D XRD
This study has been financially supported by the Czech Science Foundation via Project No. GA18-03834S and by the OP RDE, MEYS within the Project ESS SCANDINAVIA CZ.02.1.01/0.0/0.0/16_013/0001794. P. Sedmák thanks the European Synchrotron Radiation Facility for the provision of the Ph.D. grant.
- 26.Frost M, Sedlák P, Ben Zineb T (2018) Experimental observations and modeling of localization in superelastic NiTi polycrystalline alloys: state of the art. Acta Phys Pol A 134 (accepted for publication)Google Scholar
- 38.Paranjape HM, Paul PP, Sharma H, Kenesei P, Park JS, Duerig TW, Brinson LC, Stebner AP (2017) Influences of granular constraints and surface effects on the heterogeneity of elastic, superelastic, and plastic responses of polycrystalline shape memory alloys. J Mech Phys Solids 102:46–66CrossRefGoogle Scholar
- 40.Xiao Y, Zeng P, Lei L (2016) Experimental investigation on the mechanical instability of superelastic NiTi shape memory alloy. Mater Res Express 25:3551–3557Google Scholar
- 41.http://ofm.fzu.cz/localized-deformation-of-niti-in-tension. Accessed 1 Aug 2018