Fatigue tests of superelastic NiTi wires: an analysis using factorial design in single cantilever bending

Araújo, Magna Silmara de Oliveira; Grassi, Estephanie Nobre Dantas; Araújo, Carlos José de

doi:10.1088/1361-665x/ac2f82

Cited by 5 publications

(2 citation statements)

References 68 publications

(88 reference statements)

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“…Several factors affect the fatigue life of Ni-Ti SMA, such as oscillation amplitude, loading frequency, loading mode [ 17 , 21 , 22 ] and surface finish, for example. Due to these and other factors, the evaluation of cable fatigue life is complex because of the multifilament geometry of twisted wires wrapped around a core wire, which causes friction, as previously pointed out.…”

Section: Resultsmentioning

confidence: 99%

NiTi SMA Superelastic Micro Cables: Thermomechanical Behavior and Fatigue Life under Dynamic Loadings

Silva

Grassi

Araújo

et al. 2022

Sensors

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Shape memory alloy (SMA) micro cables have a wide potential for attenuation of vibrations and structural health monitoring due to energy dissipation. This work evaluates the effect of SMA thermomechanical coupling during dynamic cycling and the fatigue life of NiTi SMA micro cables submitted to tensile loadings at frequencies from 0.25 Hz to 10 Hz. The thermomechanical coupling was characterized using a previously developed methodology that identifies the self-heating frequency. When dynamically loaded above this frequency, the micro cable response is dominated by the self-heating, stiffening significantly during cycling. Once above the self-heating frequency, structural and functional fatigues of the micro cable were evaluated as a function of the loading frequency for the failure of each individual wire. All tests were performed on a single wire with equal cross-section area for comparison purposes. We observed that the micro cable’s functional properties regarding energy dissipation capacity decreased throughout the cycles with increasing frequency. Due to the additional friction between the filaments of the micro cable, this dissipation capacity is superior to that of the single wire. Although its fatigue life is shorter, its delayed failure compared to a single wire makes it a more reliable sensor for structural health monitoring.

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Section: Resultsmentioning

confidence: 99%

NiTi SMA Superelastic Micro Cables: Thermomechanical Behavior and Fatigue Life under Dynamic Loadings

Silva

Grassi

Araújo

et al. 2022

Sensors

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“…1. Factorial design A factorial design is a screening experimental design method that aims to find the design variables involved in optimization by screening out remarkable factors from multi-factors [9] to [11]. 2.…”

Section: Design Of Experimentsmentioning

confidence: 99%

Optimization Method of Multi-parameter Coupling for a Hydraulic Rolling Reshaper Based on Factorial Design

Li,

Luo,

et al. 2023

sv-jme

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A hydraulic rolling reshaper is an advanced shaping technology with superior protection for casings, and the structural parameters of the reshaper affect its shaping effect on deformed casing directly. To improve the shaping capacity of the reshaper, a multi-parameter coupling optimization method of hydraulic rolling reshaper is proposed to optimize the design of the factors with significant influence under the premise of screening multi-structural parameters. In this paper, according to the working principle of the reshaper, considering the contact nonlinearity between the hydraulic rolling reshaper and deformed casing, as well as the material nonlinearity of the casing, a parametric finite element model of the hydraulic rolling reshaper repairing the shrinkage deformation of casings was developed. The remarkable factors were screened by factorial design, the sample points were generated by optimal Latin hyper-cube design (OLHD), and the response surface models were established by stepwise regression. Therefore, with the maximum plastic deformation of casings as the objective function, the maximum equivalent stress, residual stress, and the plastic deformation of casings as the constrained conditions, an optimized mathematical model for a reshaper was constructed, and the genetic algorithm (GA) is performed to obtain the optimal combination of parameters. The results showed that the optimal reshaper made the shaping process safe and effective, the plastic deformation of casings after single shaping was increased by 11.38 %, and the shaping effect was better (96.48 %), which can effectively improve the safety performance and shaping ability of the reshaper.

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TIG spot welding applied to NiTi shape memory wires optimized by factorial design

Rodrigues

Amorim

Grassi

et al. 2022

Int J Adv Manuf Technol

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Fatigue tests of superelastic NiTi wires: an analysis using factorial design in single cantilever bending

Cited by 5 publications

References 68 publications

NiTi SMA Superelastic Micro Cables: Thermomechanical Behavior and Fatigue Life under Dynamic Loadings

NiTi SMA Superelastic Micro Cables: Thermomechanical Behavior and Fatigue Life under Dynamic Loadings

Optimization Method of Multi-parameter Coupling for a Hydraulic Rolling Reshaper Based on Factorial Design

TIG spot welding applied to NiTi shape memory wires optimized by factorial design

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