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You may view an animation in real time of a crack growing in a Nitinol fatigue specimen observed using moire interferometry while the test was being conducted in our Bose Electroforce test machine that shows a moving transformation zone and perceptible fringes captured at 30 frames per second. You can download the brochure for this special symposium that brings together state-of-the-art developments in clinical imaging techniques, computer modeling, medical device testing and materials characterization with a focus on medical implants, their design and the Experimental Mechanics underlying device interaction with the human body.
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 [...] This paper describes a fatigue test protocol that was used to determine the factor of safety for a superelastic Nitinol implantable medical device. A rotating cam test apparatus was designed to collect the necessary life-cycle data. Fatigue test specimens were designed as scaled-up versions of the implantable device and processed in accord with the established [...] |
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