Abstract
We conducted tensile fatigue tests on polycrystalline NiTi strips with in-situ optical observation on the evolution of the localized deformation (Lüders-like band) in order to trace the deformation history of the fatigue-failure material point in the strips under various loadings. It is found that the band front motion triggering localized cyclic phase transformation leads to a short fatigue life while the "elastic" deformation (without the band front motion) results in a much longer life whose failure crack nucleates away from the immobile band front. The results provide hints to derive a material fatigue criterion from the structure fatigue tests.
| Original language | English |
|---|---|
| Pages (from-to) | 46-50 |
| Number of pages | 5 |
| Journal | Scripta Materialia |
| Volume | 123 |
| DOIs | |
| Publication status | Published - 1 Oct 2016 |
Keywords
- Fatigue
- Martensitic phase transformation
- Shape memory alloys
- Shear bands (localized deformation)
- Superelasticity
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