Low-cycle fatigue life of superelastic NiTi wires

Effects of grain size on tensile fatigue life of nanostructured NiTi shape memory alloy

“…Martensite phases (similar results can be found in [42][43][44][45]). Meanwhile, for the GS=10nm specimen, since both the yield stress and the transformation stress are increased significantly, there is still no phase transformation even under 450MPa stress ( % 9 .…”

Predicting in vivo failure of rotary nickel-titanium endodontic instruments under cyclic fatigue

“…It shows the transition from fatigue fracture region (dominated by fatigue striations; left side of image) to a fi nal fracture region (dominated by dimples and microvoids). Similar images were acquired by Sawaguchi et al 21) , Figueiredo et al 22) , Cheung and Darvell 23) , and Li et al 24) . In their cyclic fatigue evaluation of rotary Ni-Ti endodontic instruments, Li et al 24) stated that the lifespan of a rotary Ni-Ti instrument could be projected with the knowledge of canal curvature.…”

Non-proportional multiaxial whole-life transformation ratchetting and fatigue failure of super-elastic NiTi shape memory alloy micro-tubes

“…For examples, Eggeler et al [1], Wagner et al [2], Matsui et al [3], Bahia et al [4], Yan et al [5], Cheung et al [6], Figueiredo et al [7], Bernard et al [8] and Chan et al [9] performed some strain-controlled cyclic bending and rotating-bending tests, and discussed the effects of the loading rate, temperature and pre-processing method on the cyclic deformation of fatigue failure of NiTi SMA; Moumni et al [10], Predki et al [11], Kang et al [12,13], Chatellet and Moumni [14], Mammano et al [15], and Song et al [16,17] conducted some stress-controlled uniaxial and torsional cyclic loading tests and investigated the effects of the peak stress, mean stress and ambient temperature on the cyclic deformation (including the so-called transformation ratchetting (Kang et al [12])) and fatigue life of the NiTi SMA.…”