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Summary:
Phase shifted moir¿̐ư interferometry is used to study fatigue initiation in superelastic Nitinol. Notched four-point bend coupon samples were fatigue tested according to a multi-level amplitude test protocol tailored for medical implant applications. Fringe patterns of local strain measurements are presented for three loading sequences based on the type of loading and range of anticipated strains in service. The effect of an initial series of pre-load cycles is examined and resulting life data is accompanied by local strain results highlighting the unique mechanisms associated with the initiation of fatigue cracks and the development of effective test methods and protocols.
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Reproduction Note:
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2013. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
