Nitinol Fatigue Life for Variable Strain Amplitude Fatigue

Lin, Zi-yuan; Pike, K.; Schlun, Martin; Zipse, A.; Draper, John

doi:10.1007/s11665-012-0387-9

Cited by 14 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The displacements required to reach the desired pre-strain of 6% and mean strain of 3% were computed at cycle 1, whereas the displacement inputs to achieve the various strain amplitudes were computed at cycle 3 of the FEA analysis. This technique of utilizing computational modeling to establish experimental displacement inputs is common in the evaluation of Nitinol stent-like surrogates (Tolomeo et al, 2000;Pelton, 2008;Robertson and Ritchie, 2008;Gall et al, 2008;Lin et al, 2011Lin et al, , 2012Pike et al, 2011;Robertson et al, 2012;Pelton et al, 2008). Fatigue testing was performed using a 12-station Instron Model E3000 (each with isolated load cells for dynamically monitoring fracture) in 37 1C distilled water, at a frequency of 20 Hz, and under displacement-control conditions.…”

Section: Tubementioning

confidence: 99%

“…Similarly, in recent years, the effects of impurities, primarily C and O, that may form non-metallic inclusions (NMIs), in biomedical-grade NiTi (Nitinol) have been studied. In particular, investigations have demonstrated fatigue crack nucleation in Nitinol from NMIs (and/or voids) in the simple raw material form (Wick et al, 2004;Schaffer and Plumley, 2009;Rahim et al, 2013), surrogate medical device implant fatigue specimens (Tolomeo et al, 2000;Pelton, 2008;Robertson and Ritchie, 2008;Gall et al, 2008;Lin et al, 2011Lin et al, , 2012Pike et al, 2011;Robertson et al, 2012;Pelton et al, 2008), and even finished commercial devices (Pelton et al, 2008;Hull and Robertson, 2009). On a commercial scale, Nitinol is melted by vacuum arc remelting (VAR), vacuum induction melting (VIM) or a combination of the two.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A statistical approach to understand the role of inclusions on the fatigue resistance of superelastic Nitinol wire and tubing

Robertson¹,

Launey²,

Shelley³

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

Section: Tubementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A statistical approach to understand the role of inclusions on the fatigue resistance of superelastic Nitinol wire and tubing

Robertson¹,

Launey²,

Shelley³

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

View full text Add to dashboard Cite

“…The RMR samples were subjected to a second 250°C stressfree heat treatment for 15 h, then electropolished identically. Figure 2 depicts the sample geometry used for the formed wire bending fatigue tests, using a similar approach as described by [28]. The design was intended to represent a portion of a simple stent-like structure, of the type often used to support endografts for treatment of abdominal aortic aneurysms (AAA) or thoracic aortic aneurysms (TAA).…”

Section: Experiments 2: Formed Wire Bending Fatiguementioning

confidence: 99%

The Role of Parent Phase Compliance on the Fatigue Lifetime of Ni–Ti

Bonsignore

Shamini

Duerig

2019

Shap. Mem. Superelasticity

View full text Add to dashboard Cite

It has been previously suggested that the fatigue lifetime of superelastic Ni-Ti might be improved if the R-phase were the parent to martensite rather than austenite. This body of work tests that hypothesis in two separate side-by-side fatigue tests both carefully constructed to match the superelastic properties in the two study arms. Both experiments show the R-phase parent to be more durable than the more commonly considered austenitic parent phase. The first experiment considers straight wire specimens fabricated from standard purity material, in a tension-tension fatigue test to 10 7 cycles, at mean strain ranging of 0.5-5.8% and strain amplitudes of 0.15-0.45%. The second experiment considers formed wire specimens in bending fatigue, more representative of realistic medical components, with a maximum mean strain of 1.2%, and maximum strain amplitudes ranging from 0.72 to 1.64%. Compared with the austenitic parent material, the R-phase material tolerated 0.1-0.3% higher strain amplitudes.

show abstract

“…Therefore, endodontic tools made of nitinol are manufactured by removal methods using milling with carbide tools and subsequent grinding [226,227]. However, it is impossible to manufacture technologies used for endodontic tools made of corrosionresistant steel by twisting [228], due to the risk of scrapping the tool during the The method of manufacturing nitinol alloy also has a significant impact on its properties [184,187,218,219] due to the possibility of reducing the proportion of non-metallic Ti 4 Ni 2 O x inclusions [220,221] and elimination of uncontrolled changes in the ratios between the atomic concentrations of nickel and titanium, resulting in stabilization and improvement of fatigue properties, requiring the use of raw materials of the highest purity [222][223][224]. The electro-arc melting technology of nitinol alloys seems to be useless, while their manufacturing by the vacuum arc remelting (VAR) [221,225] of high purity [225], with a smaller (usually 5-10 times smaller) proportion of non-metallic inclusions than in the case of standard melt and fatigue strength several times higher [225].…”

Section: Methods and Tools Of Root Canal Preparation In Endodontic Treatmentmentioning

confidence: 99%

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Dobrzańska¹,

Dobrzański²,

Dobrzański³

et al. 2021

Processes

View full text Add to dashboard Cite

The paper is an extensive monographic review of the literature, and also uses the results of the authors’ own experimental research illustrating the noticed developmental tendencies of the filling material based on gutta-percha. The whole body of literature proves the correctness of the research thesis that this material is the best currently that can be used in endodontics. Caries is one of the most common global infectious diseases. Since the dawn of humankind, the consequence of the disease has been the loss of dentition over time through dental extractions. Both tooth caries and tooth loss cause numerous complications and systemic diseases, which have a serious impact on insurance systems and on the well-being, quality, and length of human life. Endodontic treatment, which has been developing since 1836, is an alternative to tooth extraction. Based on an extensive literature review, the methodology of qualifying patients for endodontic treatment was analyzed. The importance of selecting filling material and techniques for the development and obturation of the root canal during endodontic treatment was described. Particular attention was paid to the materials science aspects and the sequence of phase transformations and precipitation processes, as well as the need to ensure the stoichiometric chemical composition of Ni–Ti alloys, and the vacuum metallurgical processes and material processing technologies for the effects of shape memory and superelasticity, which determine the suitability of tools made of this alloy for endodontic purposes. The phenomena accompanying the sterilization of such tools, limiting the relatively small number of times of their use, play an important role. The methods of root canal preparation and obturation methods through cold side condensation and thermoplastic methods, including the most modern of them, the thermo-hydraulic condensation (THC) technique, were analyzed. An important element of the research hypothesis was to prove the assumption that to optimize the technology of development and obturation of root canals, tests of filling effectiveness are identified by the density and size of the gaps between the root canal wall, and the filling methods used and devices appropriate for material research, using mainly microscopy such as light stereoscopic (LSM) and scanning electron (SEM). The most beneficial preparations were obtained by making a longitudinal breakthrough of 48 natural human teeth, extracted for medical reasons, different from caries, with compliance with all ethical principles in this field. The teeth were prepared using various methods and filled with multiple obturation techniques, using a virtual selection of experimental variants. The breakthroughs were made in liquid nitrogen after a one-sided incision with a narrow gap created by a diamond disc using a materialographic cutter. The best effectiveness of the root canal filling was ensured by the technology of preparing the root canals with K3 rotary nitinol tools and filling the teeth with the THC thermoplastic method using the System B and Obtura III devices with studs and pellets of filling material based on gutta-percha after covering the root canal walls with a thin layer of AH Plus sealant. In this way, the research thesis was confirmed.

show abstract

Nitinol Fatigue Life for Variable Strain Amplitude Fatigue

Cited by 14 publications

References 8 publications

A statistical approach to understand the role of inclusions on the fatigue resistance of superelastic Nitinol wire and tubing

A statistical approach to understand the role of inclusions on the fatigue resistance of superelastic Nitinol wire and tubing

The Role of Parent Phase Compliance on the Fatigue Lifetime of Ni–Ti

Is Gutta-Percha Still the “Gold Standard” among Filling Materials in Endodontic Treatment?

Contact Info

Product

Resources

About