Low-Cycle Fatigue of TiNi Shape Memory Alloy and Formulation of Fatigue Life

Tobushi, Hisaaki; Nakahara, Takafumi; Shimeno, Yoshirou; Hashimoto, Takahiro

doi:10.1115/1.482785

Cited by 88 publications

(81 citation statements)

References 14 publications

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“…[1][2][3] The thermal response of SMAs during cyclic loading has been largely analyzed in the literature, but applications to fatigue are rare or are limited to short time measurement intervals. Temperature variation during the low-cycle fatigue of a nickel-titanium (Ni-Ti) SMA was studied in Tobushi et al [4] The fatigue of a Ni-Ti SMA was also studied, with a focus on the thermal response near stress-induced martensitic transformation, in Alarcon et al [5] The effect of deformation frequency on thermal response was discussed in Yin et al [6] A mechanical dissipation assessment during cyclic loading lasting a few minutes was performed on a copper-based SMA in Bubulinca et al [7] This study is a follow-up of this latter work, with a focus on long-term cyclic tests.…”

Section: Introductionmentioning

confidence: 99%

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Delpueyo

Balandraud

Grédiac

et al. 2017

Strain

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This paper presents a calorimetric approach to the measurement of mechanical dissipation in specimens subjected to cyclic tensile tests. Mechanical dissipation, that is, the heat power produced by the material due to mechanical irreversibility, can potentially be deduced from the temperature changes captured on the specimen surface by infrared thermography. However, a difficulty arises for long-term cyclic tests: Results are easily skewed by any change in the specimen's environment. The problem is amplified by the fact that mechanical dissipation is in general small compared to the heat sources associated with thermomechanical couplings, making its estimation difficult. The paper proposes a simple procedure to extract a well-resolved estimation of mechanical dissipation by solving two key points specific to long-term cyclic tests: (a) the reduction of the parasitic effects associated with changes in the specimen's environment by using a specific device based on two references samples and (b) the choice of relevant thermal data acquisition parameters. A test is performed on a copper-based shape-memory alloy whose calorific response comprises three origins of heat sources: thermoelastic coupling, phase transformation, and mechanical irreversibility. The results obtained demonstrate the relevancy of the approach in extracting mechanical dissipation from the thermal response of the specimen subjected to long-term tensile tests in fatigue.

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Section: Introductionmentioning

confidence: 99%

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Delpueyo

Balandraud

Grédiac

et al. 2017

Strain

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“…As evidenced by Figure 3, Tobushi et al [11][12][13][14] have contributed significantly to the study of NiTi rotating-bending fatigue for a limited to 0.5-2.5%. These materials engineering studies utilized NiTi wire of slightly larger diameter (0.75 mm), and systematically varied temperature, strain amplitude, environmental fluid, and rotational speed (100 -1000 rpm).…”

Section: Resultsmentioning

confidence: 99%

“…This shortcoming is due chiefly to the distinct approaches to research adopted by these two fields. Materials engineering studies such as those reported by Tobushi et al [11][12][13][14] relate the cycles to failure N f of pseudoelastic NiTi as a function of systematically varied and normalized quantities such as strain amplitude and relative temperature. In such studies, experiments are conducted on model NiTi specimens-smooth wires for which the cross-sectional diameter and the strain amplitude are constant over the length of the wire-but do not consider the range of strain amplitudes consistent with endodontic applications.…”

Section: Introductionmentioning

confidence: 99%

Predicting in vivo failure of pseudoelastic NiTi devices under low cycle, high amplitude fatigue

Young

Vliet

2004

J Biomed Mater Res

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Due to the large reversible strains achievable through the stress-induced austenite-martensite phase transformation in NiTi alloys, NiTi has replaced stainless steel in the majority of large-strain biomedical applications such as root canal enlargement. However, the pseudoelasticity of NiTi is currently overshadowed by the short fatigue life of NiTi wires used in this low cycle (200 -2000 rpm), high amplitude ( a > 2.5%) application, resulting in in vivo fracture or premature retirement of otherwise reusable NiTi-based wire devices. In this study, the failure of pseudoelastic 55.8 wt % Ni-Ti wire is investigated experimentally, as a function of experimental parameters that include the clinically relevant regime. The effects of radius of curvature, angle of curvature, wire diameter, strain amplitude, cyclic frequency, volume under strain, and specific heat of the surrounding environmental fluid are considered systematically. These data indicate that the lifetime or cycles to failure N f of a rotating NiTi wire can be predicted via a modified Coffin-Manson relation that is a strong function of both strain amplitude and volume under strain, and a weaker function of frequency and fluid specific heat. The resulting quantitative relation can be used to predict useful device lifetime under clinically relevant conditions and thereby reduce incidences of in vivo failure.

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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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Low-Cycle Fatigue of TiNi Shape Memory Alloy and Formulation of Fatigue Life

Cited by 88 publications

References 14 publications

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

A specific device for enhanced measurement of mechanical dissipation in specimens subjected to long‐term tensile tests in fatigue

Predicting in vivo failure of pseudoelastic NiTi devices under low cycle, high amplitude fatigue

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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