Methodology for the estimation of material damping as applied to superelastic shape memory alloy mini-springs

Reis, Rômulo Pierre Batista dos; Silva, P.C.S.; Senko, Richard; Silva, A.A.; Araújo, Carlos José de

doi:10.1016/j.matdes.2018.11.012

Cited by 14 publications

(14 citation statements)

References 21 publications

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“…For these situations, superelastic SMA has great potential due to the material's intrinsic energy dissipation capacity. Some examples of the dynamic applications of SMA include re-centering devices in civil engineering [8][9][10][11] and vibration dampers applied in varied mechanical systems, such as rotary machines [12][13][14]. Nevertheless, in these dynamic applications, functional thermomechanical properties, such as energy dissipation capacity and equivalent viscous damping factor can be considerably hindered by the effects of self-heating due to the accumulation of latent heat during cyclic phase transformation, leading to overall inefficiency.…”

Section: Introductionmentioning

confidence: 99%

Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

Souza

Silva

Grassi

et al. 2021

Sensors

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The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is crucial to study its effect for the successful use of these materials in dynamic applications. Based on the superelastic cyclic behavior, this work presents an experimental methodology for the determination of the critical frequency of the self-heating of a NiTi Belleville conical spring. For this, cyclic compressive tests were carried out using a universal testing machine with loading frequencies ranging from 0.5 Hz to 10 Hz. The temperature variation during the cyclic tests was monitored using a micro thermocouple glued to the NiTi Belleville spring. Numerical simulations of the spring under quasi-static loadings were performed to assist the analysis. From the experimental methodology applied to the Belleville spring, a self-heating frequency of 1.7 Hz was identified. The self-heating is caused by the latent heat accumulation generated by successive cycles of stress-induced phase transformation in the material. At 2.0 Hz, an increase of 1.2 °C in the average temperature of the SMA device was verified between 1st and 128th superelastic cycles. At 10 Hz, the average temperature increase reached 7.9 °C and caused a 10% increase in the stiffness and 25% decrease in the viscous damping factor. Finally, predicted results of the force as a function of the loading frequency were obtained.

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Section: Introductionmentioning

confidence: 99%

Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

Souza

Silva

Grassi

et al. 2021

Sensors

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“…Special machines were developped for or by researchers in order to investigate the response of SMA at material scale (see, Cai et al, 2005; Roy et al, 2008; Wu and Lin, 2003) or at structure scale (see Böttcher et al, 2017; dos Reis et al, 2019; Schmidt and Lammering, 2004). When we consider a structure equipped with localized damper devices, the SMA part behaviour and the dynamic response of the whole structure are difficult to link explicitly due to strong linearities in addition to SMA non-linearities (see Dieng et al, 2013; Helbert et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, it is possible for a simple SMA made structure to explicitly link the material behaviour to the dynamic response of the whole structure in order to evaluate its intrinsic damping capacity. Most of the numerical and experimental studies concern one-dimensional oscillators made up of SMA parts in the form of spring or wire submitted to harmonic axial vibrations (see Böttcher et al, 2017; dos Reis et al, 2019; Jose et al, 2018; Lacarbonara et al, 2004; Lagoudas et al, 2005; Schmidt and Lammering, 2004; Zhuo et al, 2019). Less studies concern beam submitted to transversal vibrations (see Razavilar et al, 2018; Zbiciak, 2010).…”

Section: Introductionmentioning

confidence: 99%

On the understanding of damping capacity in SMA: From the material thermomechanical behaviour to the structure response

Helbert

Volkov

Evard

et al. 2020

Journal of Intelligent Material Systems and Structures

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Superelastic Shape Memory Alloys (SMAs) provide a high damping capacity due to the hysteretic motion of the inter-phase boundaries during the martensitic transformation. They have demonstrated their ability to control vibrations of SMA-based Civil Engineering and Aerospace structures. In order to improve existing damping devices, characterization of SMA damping capacity is necessary, despite the lack of a standard procedure. Classical characterizations such as tensile or torsion tests on SMA samples are very attractive, the fact that they are common and simple to process. Furthermore, environment and loading conditions are quite easy to control. Different energy-based formulations have been proposed in the literature to explicitly predict SMA damping capacity from the hysteretic mechanical behaviour. The aim of this paper is to classify commonly used formulations from the literature, using a new thermomechanical vibration numerical model of a SMA beam structure. Thus, three energy-based predictions of SMA intrinsic damping ratio measured at the material scale are compared to the damping ratio measured from the free vibration signal at the SMA beam structure scale, taken as the objective reference. The formulation proposed by Piedbœuf and Gauvin provided a better match in three study-cases.

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“…A shape change is triggered by a temperature variation in the SME and by an isothermal mechanical loading and unloading in the SE. Other desirable properties of NiTi SMA include room temperature ductility, large recoverable deformations, constant mechanical stress, damping effect and exceptionally high wear and corrosion resistance [1,2]. Due to its unique physical and mechanical properties, this material can be used for numerous smart engineering and biomedical applications [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A new way to obtain NiTi SMA superelastic meshes: investment casting followed by hot rolling

Simões

Cardins

Grassi

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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In this work, NiTi superelastic meshes are manufactured through plasma melting followed by an injection into a mesh ceramic coating mold obtained by the lost wax technique. This is the first time such a manufacturing sequence is reported for NiTi SMA. Focus is given to the feasibility and efficiency of the manufacturing process. The as-cast NiTi meshes were afterward heat-treated and hot-rolled for thickness reduction and to increase malleability. After manufacturing, the meshes' thermomechanical properties were characterized. Differential scanning calorimetry showed that at room temperature the NiTi meshes can either be used as thermal actuators (using the shape memory effect) or as superelastic devices, depending on whether heating or cooling is performed prior to the application. This behavior leaves great potential for applications in engineering systems and biomedical uses. The superelastic behavior of the NiTi meshes was characterized through tensile tests at room temperature, showing very good cycling stability and strain recovering up to 4%. In the future, microstructural and biocompatibility investigations of the product will be evaluated to optimize the manufacturing process.

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Methodology for the estimation of material damping as applied to superelastic shape memory alloy mini-springs

Cited by 14 publications

References 21 publications

Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

Critical Frequency of Self-Heating in a Superelastic Ni-Ti Belleville Spring: Experimental Characterization and Numerical Simulation

On the understanding of damping capacity in SMA: From the material thermomechanical behaviour to the structure response

A new way to obtain NiTi SMA superelastic meshes: investment casting followed by hot rolling

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