Rotating-bending fatigue of a TiNi shape-memory alloy wire

Tobushi, Hisaaki; Hachisuka, Takashi; Yamada, So; Peng, Lin

doi:10.1016/s0167-6636(97)00019-7

Cited by 112 publications

(92 citation statements)

References 6 publications

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“…Importantly, it has been shown that in vivo intracanal temperature ranges from 31 C-35 C (17, 18); moreover, in vitro data suggest that irrigation solutions intracanal will be at body temperature within 30 to 60 seconds after deposition (20). These findings are in line with our pilot data using an infrared thermometer indicating that rotary instruments just after removal from a root canal had surface temperatures of 30.8 C-32.5 C. In agreement with previous findings (16,21) the present data indicate that fatigue life in air is shorter than in water at room temperature, perhaps because of locally elevated temperatures (15,16). To the best of our knowledge, the present study is the first to simulate cyclic fatigue test resistance for endodontic instruments under temperature conditions similar to those of the body.…”

Section: Discussionsupporting

confidence: 92%

See 1 more Smart Citation

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Vasconcelos

Murphy

Carvalho³

et al. 2016

Journal of Endodontics

176

149

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Section: Discussionsupporting

confidence: 92%

“…However, these tests were all conducted at room temperature, taking care not to generate measurable heat, which is believed to potentially change NiTi properties (15,16).…”

mentioning

confidence: 99%

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Vasconcelos

Murphy

Carvalho³

et al. 2016

Journal of Endodontics

176

149

View full text Add to dashboard Cite

show abstract

“…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: 96%

“…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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“…In such a case, if the applied strain or stress level remains within the elastic regime, the fatigue life can be extended to as high as 10 million cycles (Kumar and Lagoudas 2008). On the contrary, if the SMA is cycled at high levels of load, through detwinning or stress-induced martensitic transformation, the fatigue life may be reduced to the order of thousands of cycles (Tobushi et al 1997).…”

Section: Sma Properties and Fatiguementioning

confidence: 99%

A review on shape memory alloys with applications to morphing aircraft

Barbarino

Flores

Ajaj

et al. 2014

Smart Mater. Struct.

320

176

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Shape memory alloys (SMAs) are a unique class of metallic materials with the ability to recover their original shape at certain characteristic temperatures (shape memory effect), even under high applied loads and large inelastic deformations, or to undergo large strains without plastic deformation or failure (super-elasticity). In this review, we describe the main features of SMAs, their constitutive models and their properties. We also review the fatigue behavior of SMAs and some methods adopted to remove or reduce its undesirable effects. SMAs have been used in a wide variety of applications in different fields. In this review, we focus on the use of shape memory alloys in the context of morphing aircraft, with particular emphasis on variable twist and camber, and also on actuation bandwidth and reduction of power consumption. These applications prove particularly challenging because novel configurations are adopted to maximize integration and effectiveness of SMAs, which play the role of an actuator (using the shape memory effect), often combined with structural, load-carrying capabilities. Iterative and multi-disciplinary modeling is therefore necessary due to the fluid-structure interaction combined with the nonlinear behavior of SMAs.

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Rotating-bending fatigue of a TiNi shape-memory alloy wire

Cited by 112 publications

References 6 publications

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

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

A review on shape memory alloys with applications to morphing aircraft

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