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

Souza, Emmanuel Ferreira de; Silva, Paulo César Sales da; Grassi, Estephanie Nobre Dantas; Araújo, Carlos José de; Lima, Antônio Gilson Barbosa de

doi:10.3390/s21217140

Cited by 8 publications

(5 citation statements)

References 30 publications

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“…The intersection between Δ σ = 0 line and the Δ σ curve for various cycling frequencies identifies the self-heating frequency ( f c ) above which the material accumulates latent heat, increasing its internal temperature and consequently changing its functional properties. The methodology for determining the parameter f c used here is based on the work of de Souza et al [ 7 ] in which they analyzed a NiTi SMA Belleville spring under cyclic compression tests under various loading frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…This thermomechanical coupling is the cause of the strain rate dependence observed in SMA [ 4 , 5 , 6 ]. As a result, the hysteretic loop generated by the difference between the load/unload paths during a superelastic cycle decreases in size, affecting the energy dissipation capacity of the material [ 7 ]. Therefore, it is crucial for the designer to investigate the thermomechanical behavior of SMA structural elements under a dynamic regime, according to the system prerequisites.…”

Section: Introductionmentioning

confidence: 99%

“…The micro cable was characterized through cyclic tensile tests at loading frequencies from 0.25 Hz to 10 Hz. The self-heating frequency was identified using a previously presented experimental methodology applied to the micro cable [ 7 ]. The structural and functional fatigues of the micro cable were evaluated as a function of the loading frequency for the failure of each individual wire.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Silva

Grassi

Araújo

et al. 2022

Sensors

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“…It is worth noting that the same CuAlMn SMA CSs were used for all mechanical compression tests at different temperatures. Functional mechanical properties such as secant stiffness and dissipated energy are crucial in the design of CS devices manufactured with SMAs, particularly in applications involving the use of these devices as dynamic absorbers [34]. Based on the responses obtained in the thermomechanical tests conducted on the CuAlMn SMA CSs with a thickness of 0.5 mm, the secant stiffness (k s , in kN/m) and the dissipated energy per cycle (E D , in MJ/m 3 ) were determined at different temperatures.…”

Section: Isothermal Quasi-static Compression Responsementioning

confidence: 99%

Thermomechanical Behavior of CuAlMn SMA Cellular Structures Obtained by Rapid Investment Casting

Alves,

Silva,

Cavalcante

et al. 2024

Metals

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Shape memory alloy (SMA) bidimensional cellular structures (CSs) have a great potential application in attenuation of vibrations due to reversible martensitic phase transformations induced by thermal or mechanical loading. This work aims to produce a thermal and mechanical characterization of CuAlMn SMA CSs produced by rapid investment casting (RIC). Structures with different unit cell geometries and thicknesses of 0.5 mm and 1 mm were manufactured by centrifugal RIC. Compression tests at different temperatures were performed on the CS to verify its thermomechanical behavior. We observed that a CS with a thickness of 0.5 mm presents greater mechanical strength and lower levels of maximum force at the end of each 5% compression cycle, ranging from approximately 1/10 to 1/3, compared to structures with a thickness of 1 mm. Among all the CS configurations, the re-entrant structure exhibited higher levels of force, with higher secant stiffness and dissipated energy. The structures resisted the application of compressive forces that varied between 125 N and 500 N for the 0.5 mm CS and between 500 N and 5500 N for the 1 mm CS. Therefore, the results showed that all CuAlMn SMA CSs produced by RIC exhibited sufficient strength to attain strain levels of up to 5% at different temperatures, and that the unit cell geometry can be used to tune the mechanical properties.

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“…At the same time, it should be noted that the equivalent viscous damping factor and energy dissipated per cycle decrease with the increase in the number of load cycles at load frequencies 0.5 Hz, 1 Hz and 2 Hz. However, within the frequency range from 3 to 10 Hz, first, there is a slight decrease in energy dissipated per cycle, whereupon it sharply increases after 10-20 load cycles (it is clearly visible at 10 Hz frequency, and then reaches the plateau and remains practically unchanged [7].…”

mentioning

confidence: 98%

Methodology and some results of studying the influence of frequency on functional properties of pseudoelastic SMA

Iasnii¹,

Bykiv²,

Yasniy³

et al. 2022

Visnyk TNTU

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The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is necessary to study the effect of frequency in order to use successfully these materials in real structures. Based on the pseudoelastic cyclic behavior, the experimental methodology that allows testing of NiTi wires in stress controlled mode is proposed. Cyclic tensile tests are carried out using universal testing machine STM-100 at room temperature with loading frequencies of 0.1 Hz and 10 Hz. The functional dependencies are determined based on the experimentally obtained hysteresis loops. These functional dependencies comprise dissipated energy and damping factor. It iis found that the increase of loading frequency results in the worsening of functional properties, namely, to the decrease of dissipated energy and damping factor. This is caused by the fact that the regions of austenitic and martensitic transformation under the high loading frequency are absent. That is, the transformation of austenite into martensite does not occur, that stands for the pseudoelasticity effect. Nevertheless, it should be noted that the increase of loading frequency in 100 times augments the lifetime of pseudoelastic wire made of NiTi alloy roughly by 30%. It is determined that the increase of loading frequency results in the decrease of maximum strain in two times in the first loading cycle, and practically in 5 times after 200 cycles of loading.

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

Cited by 8 publications

References 30 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

Thermomechanical Behavior of CuAlMn SMA Cellular Structures Obtained by Rapid Investment Casting

Methodology and some results of studying the influence of frequency on functional properties of pseudoelastic SMA

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