Rotary Bend Fatigue of Nitinol to One Billion Cycles.

ABSTRACT: Nitinol implants, especially those used in cardiovascular applications, are typically expected to remain durable beyond 10⁸ cycles, yet literature on ultra-high cycle fatigue of nitinol remains relatively scarce and its mechanisms not well understood. To investigate nitinol fatigue behavior in this domain, we conducted a multifaceted evaluation of nitinol wire subjected to rotary bend fatigue that included detailed material characterization and finite element analysis as well as post hoc analyses of the resulting fatigue life data. Below approximately 10⁵ cycles, cyclic phase transformation, as predicted by computational simulations, was associated with fatigue failure. Between 10⁵ and 10⁸ cycles, fractures were relatively infrequent. Beyond 10

SUBMITTER: Weaver JD 

PROVIDER: S-EPMC10228025 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature