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On instabilities and autocatalytic effects associated with the nucleation of martensite bands in polycrystalline SMA flat tensile specimens |
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| Authors: | C. Messner G. Reisner Q. P. Sun E. Werner |
| Affiliation: | a Lehrstuhl A für Mechanik, Technische Universität München, Boltzmannstr. 15, D-85747 Garching, Germany b Department of Mechanical Engineering, Hong Kong University of Science and Technology, People's Republic of China c Christian Doppler Laboratorium für Moderne Mehrphasenstähle, Technische Universität München, Germany |
| Abstract: | The mechanical response in the pseudoelastic range of polycrystalline NiTi SMA specimens in displacement controlled tensile tests exhibits a load drop associated with the nucleation of martensitic bands, a phenomenon which is similar to the formation of Lüders bands in mild steel. A continuum mechanical energy approach allows to calculate the nominal stress–strain curve incorporating the characteristic load drop. The influence of the geometrical aspect ratio, i.e., thickness-to-width ratio of the flat tensile test specimens on the load drop is discussed and compared to the experimental data. |
| Keywords: | Localized martensitic transformation Pseudoelasticity NiTi shape memory alloys Lüders bands |
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