May 14, 2011
In this Journal of Materials Engineering and Performance paper published in February 2011, Alan Pelton reviews the fundamental principles of Nitinol fatigue from a microstructural perspective. Thermal and mechanical fatigue are discussed, with supporting data from DSC, TEM, and tensile testing illustrating mechanisms and and implications of fatigue in a variety of circumstances. Originally presented at SMST-2010, this paper also presents new constant-life diagram data for mean strains up to 9% and strain amplitudes up to 0.6%.
Pelton-2011-NiTi-Fatigue-Microstructures-and-Mechanisms.pdf
May 8, 2011
Presented at SMST-2010, and now published in the journal Biomaterials, Amanda Runciman and her collaborators present new studies on the multiaxial fatigue performance of Nitinol.
Download the paper here: 163_Runciman_EquivalentStrain_Coffin-Manson_MultiaxialFatigue.pdf
May 14, 1999
When mining our server logs in preparation for creating NitinolUniversity.com, we found that two articles in our literature database had far and away more hits than any other. So, it seems fitting that the first paper in our spotlight should be this 1999 classic by our own Tom Duerig, Alan Pelton, and Dieter Stöckel. Though now over a decade old, this paper reads like Nitinol’s Greatest Hits, touching on superelastic design, thermal deployment, kink resistance, biocompatibility, constancy of stress, biomechanical compatibility, dynamic intereference, and hysteresis. But wait, there’s more: MR compatibility, fatigue resistance, and uniform plastic deformation. It highlights such applications as stents (of course!), endoscopic instruments, septal occluders, vena cava filters, and graspers, among other things. If you read only one paper on Nitinol medical applications today, make this the one! Read more »
