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BENDING FATIGUE CHARACTERISTICS OF NITINOL
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2006
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Materials ScienceFatigue ManagementEngineeringMechanical BehaviorMechanical DesignMechanicsMechanical EngineeringNitinol Medical DevicesStressstrain AnalysisStrength PropertySolid MechanicsMechanical PerformanceMechanics Of MaterialsBiomedical EngineeringRotary Bend FatigueMedical DevicesLow-cycle FatigueFatigue
Bending is the predominant deformation mode in Nitinol medical devices and components. Many of these applications also impose cyclic bending loading conditions. The present study of rotary bend fatigue provides insight into the behaviour of Nitinol under zero mean-strain conditions. This investigation also gives a better understanding about the influence of the surface condition, transformation temperature and test temperature on the bending fatigue characteristics of Nitinol. These rotary bend results are also supplemented with non-zero-mean strain results that were obtained using a 4-point bending fixture attached to a dynamic electro force testing system. These results can be used as the basis of a constant life diagram for fatigue-resistant design of medical devices.