Journal
2019 7TH INTERNATIONAL CONFERENCE ON MECHANICAL, AUTOMOTIVE AND MATERIALS ENGINEERING (CMAME)
Volume 831, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1757-899X/831/1/012006
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Funding
- Australian Research Council [DE150101795]
- Australian Research Council [DE150101795] Funding Source: Australian Research Council
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This study reports experimental evaluation of inhomogeneous strain fields created in NiTi structures during stress-induced martensitic transformation. A superelastic NiTi thin plate was used to create samples with uniform and non-uniform geometries. Digital image correlation technique was employed to measure the local strain variation in the NiTi samples under mechanical loading. Clear Luders band formation and propagation were observed during experiments. The local strain contours revealed that the deformation was localised and spatially inhomogeneous in all samples. In the geometrically non-uniform sample, the transformation initiation and propagation were controlled by geometrical gradient. Also, the global deformation behaviour exhibited stress-gradient during forward and reverse transformations because of geometrical non-uniformity.
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