A comparative study of a NiTi alloy subjected to uniaxial monotonic and cyclic loading-unloading in tension using digital image correlation: The grain size effect

Bian, Xiaobing; Gazder, Azdiar A.; Saleh, Ahmed A.; Pereloma, Elena V.

doi:10.1016/j.jallcom.2018.11.050

Cited by 28 publications

(3 citation statements)

References 62 publications

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“…This behavior can be attributed to the local buckling deformation of the BHS, which promoted the formation of a new deformation band at the pre-existing strained band front, thereby increasing the resistance to subsequent deformation. In contrast, for the RCS and the SWS, the peak stress initially increased and then decreased, with the values consistently lower than those of the BHS (figures 12(b) and (c)) [58]. Notably, the BHS also exhibited advantages in terms of elastic modulus (figures 12(d)-(f)).…”

Section: Mechanical Properties and Shape Memory Functionmentioning

confidence: 93%

Design and additive manufacturing of bionic hybrid structure inspired by cuttlebone to achieve superior mechanical properties and shape memory function

Yuan,

Gu,

Liu

et al. 2024

Int. J. Extrem. Manuf.

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Lightweight porous materials with high load-bearing, damage tolerance and energy absorption as well as intelligence of shape recovery after material deformation are beneficial and critical for many applications, e.g., aerospace, automobiles, electronics, etc. Cuttlebone produced in the cuttlefish has evolved vertical walls with the optimal corrugation gradient, enabling stress homogenization, significant load bearing, and damage tolerance to protect the organism from high external pressures in the deep sea. This work illustrated that the complex hybrid wave shape in cuttlebone walls, becoming more tortuous from bottom to top, creates a lightweight, load-bearing structure with progressive failure. By mimicking the cuttlebone, a novel bionic hybrid structure (BHS) was proposed, and as a comparison, a regular corrugated structure (RCS) and a straight wall structure (SWS) were designed. Three types of designed structures have been successfully manufactured by laser powder bed fusion with NiTi powder. The LPBF-processed BHS exhibited a total porosity of 0.042% and a good dimensional accuracy with a peak deviation of 17.4 μm. Microstructural analysis indicated that the LPBF-processed BHS had a strong (001) crystallographic orientation and an average size of 9.85 μm. Mechanical analysis revealed the LPBF-processed BHS could withstand over 25 000 times its weight without significant deformation and had the highest specific energy absorption value (5.32 J/g) due to the absence of stress concentration and progressive wall failure during compression. Cyclic compression testing showed that LPBF-processed BHS possessed superior viscoelastic and elasticity energy dissipation capacity. Importantly, the uniform reversible phase transition from martensite to austenite in the walls enables the structure to largely recover its pre-deformation shape when heated (over 99% recovery rate). These design strategies can serve as valuable references for the development of intelligent components that possess high mechanical efficiency and shape memory capabilities.

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Section: Mechanical Properties and Shape Memory Functionmentioning

confidence: 93%

Design and additive manufacturing of bionic hybrid structure inspired by cuttlebone to achieve superior mechanical properties and shape memory function

Yuan,

Gu,

Liu

et al. 2024

Int. J. Extrem. Manuf.

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“…When viewed along the axial/loading direction, each Debye-Scherrer ring is projected as a pair of curved lines separated by a distance of 2θ on the {hkl} pole figure [22]. From the literature [11,34] and earlier electron back-scattering diffraction work [9,46], we know that the material possesses an initial 〈111〉 B2 fibre texture along the axial/loading direction. Moreover, uniaxial tensile loading leads to the development of an axisymmetric fibre texture.…”

Section: Experimental and Analytical Proceduresmentioning

confidence: 99%

An in-situ synchrotron study of the B2→B19′ phase transformation in a Ni-Ti alloy subjected to uniaxial monotonic tension

Bian

Saleh

Lynch

et al. 2019

Materials Science and Engineering: A

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“…Indeed, DIC has been used previously for validating finite element (FE) biomechanics models of femoral [25], hemipelvic [26], craniofacial [27], and dental [28] implants as well as replica [29] and cadaveric [30,31] femurs. Digital image correlation has also been used to investigate the mechanics of polycrystalline nickel titanium (nitinol) starting in the mid 2000s [32,33], with interest rapidly increasing since that time (e.g., [34][35][36][37][38][39][40][41][42][43][44][45][46]; Figure 1). However, direct strain measurement on finished nitinol cardiovascular devices using either strain gauges or full-field DIC has been impractical to date due to limitations of scale, with typical strut cross-sectional dimensions measuring only a few hundred microns as illustrated in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

Full-field microscale strain measurements of a nitinol medical device using digital image correlation

Aycock

Weaver

Paranjape³

et al. 2021

Journal of the Mechanical Behavior of Biomedical Materials

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Computational modeling and simulation are commonly used during the development of cardiovascular implants to predict peak strains and strain amplitudes and to estimate the associated durability and fatigue life of these devices. However, simulation validation has historically relied on comparison with surrogate quantities like force and displacement due to barriers to direct strain measurement-most notably, the small spatial scale of these devices. We demonstrate the use of microscale two-dimensional digital image correlation (2D-DIC) to directly characterize full-field surface strains on a nitinol device coupon under emulated physiological loading. Experiments are performed using a digital optical microscope and a custom, temperature-controlled load frame. Following applicable recommendations from the International DIC Society, hardware and environmental heating studies, noise floor analyses, and inand out-of-plane rigid body translation studies are first performed to characterize the microscale DIC setup. Uniaxial tension experiments are also performed using a polymeric test specimen up to nominal stains of 5%. Sub-millimeter fields of view and sub-micron displacement accuracies (9 nm mean error) are achieved, and systematic (mean) and random (standard deviation) errors in strain are each estimated to be approximately 1,000 µ. The system is then demonstrated by acquiring measurements at the root of a 300 µm-wide nitinol device strut undergoing fixed-free cantilever bending motion. Lüderslike transformation bands are observed originating from the tensile side of the strut that spread toward the neutral axis at an angle of approximately 55°. Optical microscale 2D-DIC setups like that demonstrated herein will be useful in future studies for characterizing cardiovascular implant micromechanics, validating computational models, and guiding the development of next-generation material models for simulating superelastic nitinol.

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A comparative study of a NiTi alloy subjected to uniaxial monotonic and cyclic loading-unloading in tension using digital image correlation: The grain size effect

Cited by 28 publications

References 62 publications

Design and additive manufacturing of bionic hybrid structure inspired by cuttlebone to achieve superior mechanical properties and shape memory function

Design and additive manufacturing of bionic hybrid structure inspired by cuttlebone to achieve superior mechanical properties and shape memory function

An in-situ synchrotron study of the B2→B19′ phase transformation in a Ni-Ti alloy subjected to uniaxial monotonic tension

Full-field microscale strain measurements of a nitinol medical device using digital image correlation

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