Fatigue Properties of TiNi Shape Memory Alloy

Tobushi, Hisaaki; Hashimoto, T.; Shimeno, Yoshirou; Takata, Kazuyuki

doi:10.4028/www.scientific.net/msf.327-328.151

Cited by 8 publications

(6 citation statements)

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“…Bending rotation fatigue (BRF) is generally used as a standard test for the structural fatigue of shape memory alloy wires [13]. Wagner et al [14] indicated that increasing rotational speed in a BRF test resulted in shorter rupture lives of NiTi shape memory wires while the wire was exposed to air.…”

Section: Introductionmentioning

confidence: 99%

Comparison of seismic performance of three restrainers for multiple-span bridges using fragility analysis

et al. 2009

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Steel restrainer cables for multiple-frame bridges in California in the United States showed the effectiveness to prevent the unseating at the internal hinges during the past several earthquakes. After that, the steel restrainer cables are being tried to apply for multiple-span-simply-supported (MSSS) bridges in the central and the southeastern regions in the United States. In addition, shape memory alloy (SMA) bars in tension are being studied for the same application. In multiple-frame bridges, the developed seismic forces are transferred to piers through the restrainers; however, in MSSS bridges, the seismic forces are transferred to abutments by the restrainers. Therefore, the abutment's behavior should be investigated as well. This study assesses the seismic performance of the three types of restrainers-steel restrainer cables, SMA bars in tension, and SMA bars in bending for MSSS bridges-due to moderate to strong ground motions using a deterministic seismic analysis. Also, a fragility analysis is conduced to assess the seismic resistance for the overall bridge system. For these analyses, the bending test of an SMA bar is conducted and its analytical model is determined. Then, nonlinear time history analyses are conducted to assess the seismic responses of the as-built and the retrofitted bridges. The deterministic analysis illustrates how the restrainers influence the components of the bridge. However, it could not explain the effects on the whole bridge system. The fragility analysis shows the effects of the three restrainers on the overall bridge system. The fragility analysis indicates that the SMA bars in bending are the most effective ones.

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Section: Introductionmentioning

confidence: 99%

Comparison of seismic performance of three restrainers for multiple-span bridges using fragility analysis

et al. 2009

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“…A rotating-bending fatigue test machine [9], a pulsatingbending fatigue test machine [13], and a newly developed alternating-bending fatigue test machine were used for the fatigue test.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…One of the main deformation modes of such elements is bending. The authors studied the bending fatigue properties of a TiNi SMA wire [9][10][11][12][13]. Because the fatigue strength of TiNi SMAs depends highly on the stress ratio [14], the fatigue life differs depending on the mode of bending.…”

Section: Introductionmentioning

confidence: 99%

Fatigue properties of a TiNi shape-memory alloy wire subjected to bending with various strain ratios

Furuichi

Tobushi

Ikawa

et al. 2003

Proceedings of the Institution of Mechanical Engineers, Part L:

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A fatigue-test machine for alternating bending of a wire under strain-controlled conditions was developed. Bending-fatigue tests on a TiNi shape-memory alloy wire were then performed for various strain ratios. The results obtained can be summarized as: (1) the fatigue life curves under alternating bending and pulsating bending, as expressed by the relationship between maximum strain and the number of cycles to failure, systematically follow the order of strain ratio; (2) the larger the strain ratio, the longer the fatigue life;(3) the fatigue life under rotating bending is shorter than that under alternating bending; (4) the increase in temperature during cyclic bending becomes larger in the order: rotating bending, alternating bending, pulsating bending. The fatigue life decreases in proportion to the increase in temperature; and (5) the fatigue limit of strain for alternating bending, pulsating bending and rotating bending is in the region of R-phase transformation.

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“…That is one reason why BRF has been recognised by various researchers as one important type of fatigue loading. Tobushi et al [12][13][14][15][16] and Miyazaki et al [17,18] have established BRF testing as one standard test to investigate the fatigue behaviour of pseudoelastic shape memory wires. It is interesting to note that the results of BRF experiments have even been utilized in order to assess the fatigue characteristics of vascular stents and orthodontic arch wires [19].…”

Section: Introductionmentioning

confidence: 99%

Design of a Medical Non‐Linear Drilling Device: The Influence of Twist and Wear on the Fatigue Behaviour of NiTi Wires Subjected to Bending Rotation

Wagner

Richter

Frenzel

et al. 2004

Materialwissenschaft Werkst

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This paper considers fundamental and experimental aspects associated with the engineering design of a medical, non-linear drilling device which exploits shape memory pseudoelasticity of NiTi wires. For this application it is important that the NiTi wires have a good fatigue resistance. This is why the present authors have previously determined the influence of various parameters on cyclic life, crack growth and stress state of pseudoelastic wires subjected to bending rotation fatigue. The actual drilling device has to withstand twist in addition to bending rotation because the free rotation is constrained by friction between the drill head and the bone material. In addition, friction between the wire and a NiTi guiding tube results in wear and this may well promote fatigue crack nucleation. In this paper, we explain the function of the medical drill. We then report results on the effect of the additional parameters (1) twist and (2) wear on the fatigue life of thin pseudoelastic NiTi wires. We finally discuss the implications of our experimental results for the design process of the medical drilling device.

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Fatigue Properties of TiNi Shape Memory Alloy

Cited by 8 publications

References 0 publications

Comparison of seismic performance of three restrainers for multiple-span bridges using fragility analysis

Comparison of seismic performance of three restrainers for multiple-span bridges using fragility analysis

Fatigue properties of a TiNi shape-memory alloy wire subjected to bending with various strain ratios

Design of a Medical Non‐Linear Drilling Device: The Influence of Twist and Wear on the Fatigue Behaviour of NiTi Wires Subjected to Bending Rotation

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