Experimental Investigation of the Pseudoelastic Hysteresis Damping Characteristics of Shape Memory Alloy Wires

Wolons, David; Gandhi, Farhan; Malovrh, Brendon

doi:10.1177/1045389x9800900205

Cited by 73 publications

(67 citation statements)

References 7 publications

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“…Concerning the strain rate at which fatigue takes place, up to now cycling research of NiTi SMAs has focused on tensile behavior at low strain rates, from 10 −4 to 10 −3 s −1 . The cyclic characterization for higher strain rates has been carried out by a few groups, mostly limited to the order of 10 −1 s −1 [3,12,13]. Higher strain rates, on the order of 10 3 s −1 , have recently been achieved using Split Hopkinson Pressure Bar technique (S.H.P.B.…”

Section: Introductionmentioning

confidence: 99%

Impact fatigue behavior of superelastic NiTi shape memory alloy wires

Zurbitu

Santamarta

Picornell

et al. 2010

Materials Science and Engineering: A

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a b s t r a c tSuperelastic cyclic behavior of NiTi wires was studied by cyclically deforming several samples at impact strain rates on the order of 10 s −1 , using an instrumented tensile-impact device. The stress-strain cycles were performed up to different maximum strain ratios in order to study the cyclic impact fatigue for the incomplete, complete stress-induced martensitic transformation, and for the elastoplastic deformation of the martensitic phase. Impact results show that the stress-induced martensitic transformation stresses decrease with the number of cycles, although this decrease is lower than that obtained in cycling fatigue experiments performed at low strain rates. This suggests that the increment of the dislocation density, responsible for the stress reduction, depends on the strain rate applied during deformation. Moreover, the near-adiabatic condition fulfilled when deforming at high strain rates, promoting higher stress-induced martensitic transformation stresses during cycling at impact than the ones reached at low strain rates. In addition, the dissipated energy per cycle is also affected by the strain rate, being at impact 10-15% lower than the values obtained when the deformation occurs in isothermal conditions, that is at strain rates lower than 10 −4 s −1 .

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Section: Introductionmentioning

confidence: 99%

Impact fatigue behavior of superelastic NiTi shape memory alloy wires

Zurbitu

Santamarta

Picornell

et al. 2010

Materials Science and Engineering: A

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“…In the recent research, it has been found that the properties of the SE depend on cyclic loading [6][7][8], strain rate [9][10][11][12] and the loading conditions [13][14][15]. In order to design SMA elements in Science which the properties of energy storage and dissipation due to the SE are used, it is important to evaluate these properties properly and to take them into account of the design.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of energy storage and dissipation in TiNi shape memory alloy

Pieczyska

Gadaj

Nowacki

et al. 2005

Science and Technology of Advanced Materials

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The characteristics of energy storage and dissipation in TiNi shape memory alloys were investigated experimentally based on the superelastic properties under various thermomechanical loading conditions. The influence of strain rate, cyclic loading and temperature-controlled condition on the characteristics of energy storage and dissipation of the material was investigated. Temperature on the surface of the material was observed and the influence of variation in temperature on the characteristics was clarified. The results obtained can be summarized as follows. (1) In the case of low strain rate, the stress plateaus appear on the stress-strain curves due to the martensitic transformation and the reverse transformation during loading and unloading. In the case of high strain rate, the slopes of the stress-strain curves are steep in the phase-transformation regions during loading and unloading. The recoverable strain energy per unit volume increases in proportion to temperature, but the dissipated work per unit volume depends slightly on temperature. In the case of low strain rate, the recoverable strain energy and dissipated work do not depend on both strain rate and the temperature-controlled condition. (2) In the case of high strain rate, while the recoverable strain energy density decreases and dissipated work density increases in proportion to strain rate under the temperature-controlled condition, the recoverable strain energy density increases and dissipated work density decreases under the temperature-uncontrolled condition. In the case of the temperature-uncontrolled condition, temperature varies significantly due to the martensitic transformation and therefore the characteristics of energy storage and dissipation differ from these under the temperature-controlled condition. (3) In the case of cyclic loading, both the recoverable strain energy and dissipated work decrease in the early 20 cycles, but change slightly thereafter. (4) The influence of strain rate, cyclic loading and the environment on the characteristics of energy storage and dissipation is important to be considered in the design of shape memory alloy elements. q

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“…The complex modulus is widely used in the fields of elastomers and hysteretic elements in general [28]. The advantage of using the complex modulus is that the relatively complicated SMA behaviour can be simplified into a single quantity having a real and an imaginary part that may be functions of e.g.…”

Section: Complex Modulusmentioning

confidence: 99%