A crystal plasticity-based study of the relationship between microstructure and ultra-high-cycle fatigue life in nickel titanium alloys

Moore, J.; Frankel, Dana; Prasannavenkatesan, Rajesh; Domel, August G.; Olson, Gregory B.; Liu, Wing Kam

doi:10.1016/j.ijfatigue.2016.06.006

Cited by 29 publications

(14 citation statements)

References 53 publications

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“…The main difference between both results is the higher overall strain amplitude level, which was found for cyclic loaded PVAs. This fatigue strain effect attributed to the existence of voids is in good agreement with results by Moore et al [32] and Kafka et al [33], which observed a strong drop in fatigue initiation lifetime based on numerical evaluation methods for PVAs. By analyzing the effect of varying mean strain on the strain amplitude in the bottom of Fig.…”

Section: General Overviewsupporting

confidence: 92%

Numerical Investigation on the Effect of Inclusions on the Local Fatigue Strain in Superelastic NiTi Alloy

Koschella

Degel

Hempel

2023

Shap. Mem. Superelasticity

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The important role of inclusions for the fatigue behavior of Nitinol and the related service lifetime for medical devices is stated by numerous studies. Besides the well-known size effect on the fatigue limit, the corresponding crack initiation was observed preferably at particle-void-combinations. However, the detailed relationship of several geometrical inclusion properties and the resulting fatigue load remains not clear. To shed a light on this effects relationship, a numerical investigation was performed with a superelastic material behavior on a macroscopic framework. In the scope of this study, two-dimensional unit cells with fully embedded particles or particle-void-assemblies of different shapes and different relative orientations with respect to the load direction were evaluated. Additionally, those unit cells were subjected to different global strain amplitudes and mean strain levels. The careful evaluation of the results revealed a hierarchy of parameter effects on the fatigue strain. Besides the trivial relationship between global applied and local resulting fatigue load, the inclusion shape and the orientation were observed to show a strong effect on the local fatigue strain.

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Section: General Overviewsupporting

confidence: 92%

Numerical Investigation on the Effect of Inclusions on the Local Fatigue Strain in Superelastic NiTi Alloy

Koschella

Degel

Hempel

2023

Shap. Mem. Superelasticity

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“…inclusion was also modeled, providing two extreme cases. It has been reported that particle void assemblies (PVAs) are in fact the worst-case condition (Ref 22,24) and warrant modeling in the future work. FEA studies have also shown that the morphology of the inclusions (size and shape) plays a role in influencing the fatigue life of Nitinol compared to inclusion material type and inclusion-inclusion interactions (Ref 24, 25).…”

Section: Discussionmentioning

confidence: 99%

Effect of Prestrain on the Fatigue Life of Superelastic Nitinol

Senthilnathan

Shamimi

Bonsignore

et al. 2019

J. of Materi Eng and Perform

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Three types of fatigue testing are performed to elucidate the effects of prestraining superelastic Nitinol on its subsequent fatigue lifetime: rotary bending and tension-tension testing of wire, and beam bending using diamond-shaped specimens fabricated from tubing. Results show that local plastic deformation during prestraining induces residual stresses that have a pronounced effect on fatigue performance, enhancing performance when the fatigue duty cycle is of the same sense as the prestraining (tensile prestraining followed by a tensile duty cycle, for example), and decreasing fatigue lifetime when the sense of the duty cycle is opposite to that of prestraining. This provides an avenue to increasing fatigue lifetime, but more importantly it highlights the need to fully understand the nature of the duty cycle: for example, prestraining a stent by crimping it into a delivery catheter induces favorable residual stresses with respect to subsequent pulsatile fatigue, but might accelerate fracture in other modes, such as axial or crush fatigue. Caution is also advised when trying to apply data from ''constant life diagrams'' derived from the literature (Ref 1, 2 for example) that may not properly reflect the strain history of the device being analyzed.

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“…A Fatemi-Socie fatigue indicating parameter, akin to that described in Ref. [27], is then used to determine regions or high fatigue initiation potency.…”

Section: Void Clustermentioning

confidence: 99%

Modeling process-structure-property relationships for additive manufacturing

et al. 2018

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This paper presents our latest work on comprehensive modeling of process-structure-property relationships for additive manufacturing (AM) materials, including using data-mining techniques to close the cycle of design-predict-optimize. To illustrate the processstructure relationship, the multi-scale multi-physics process modeling starts from the micro-scale to establish a mechanistic heat source model, to the meso-scale models of individual powder particle evolution, and finally to the macro-scale model to simulate the fabrication process of a complex product. To link structure and properties, a highefficiency mechanistic model, self-consistent clustering analyses, is developed to capture a variety of material response. The model incorporates factors such as voids, phase composition, inclusions, and grain structures, which are the differentiating features of AM metals. Furthermore, we propose data-mining as an effective solution for novel rapid design and optimization, which is motivated by the numerous influencing factors in the AM process. We believe this paper will provide a roadmap to advance AM fundamental understanding and guide the monitoring and advanced diagnostics of AM processing.

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A crystal plasticity-based study of the relationship between microstructure and ultra-high-cycle fatigue life in nickel titanium alloys

Cited by 29 publications

References 53 publications

Numerical Investigation on the Effect of Inclusions on the Local Fatigue Strain in Superelastic NiTi Alloy

Numerical Investigation on the Effect of Inclusions on the Local Fatigue Strain in Superelastic NiTi Alloy

Effect of Prestrain on the Fatigue Life of Superelastic Nitinol

Modeling process-structure-property relationships for additive manufacturing

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