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In this paper, we present a research methodology to characterize the effects of crystallographic orientation and grain size on the deformations and transformations in Nitinol. The approach involves a combination of full-field strain measurements using Moiré interferometry and finite element modeling. We explore the effects of localized stress raisers such as notches and grain boundaries, and [...] Moire Interferometry is a powerful photomechanics technique that can produce full-field strain measurements with remarkable resolution. Illustrated in the photos are solder balls in an electronic package with the moiré fringes representing contours of displacement with sub-micron resolution per fringe. This work was performed for a patent infringement case where moiré interferometry was able to [...] |
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