Abstract
Phase shifted moiré interferometry is used to measure full-field strains during uniaxial tension and four-point bend loading of nitinol test samples. Optical resolution and grating coherence were exceptional and allowed simultaneous resolution of the strain fields within both the parent and transformed phases of the material. Evidence of localized and uniformly distributed phase transformation was observed for the samples tested in uniaxial tension while the bending results indicate a clear tension/compression asymmetry. The results further highlight the effect of the elasticity of the two phases and the complexity associated with competing martensite and R-phase transformations on the thermomechanical behavior of nitinol. Finally, the technique is applied to a nitinol implantable medical component to demonstrate the opportunities for improved end-use material characterization, numerical modeling and design validation.
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Perry, K.E., Labossiere, P.E. & Steffler, E. Measurement of Deformation and Strain in Nitinol. Exp Mech 47, 373–380 (2007). https://doi.org/10.1007/s11340-006-9014-8
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DOI: https://doi.org/10.1007/s11340-006-9014-8