Design of Piezo-SMA Composite for Thermal Energy Harvester Under Fluctuating Temperature

Namli, Onur C.; Taya, Masahito

doi:10.1115/1.4002592

Cited by 31 publications

(20 citation statements)

References 18 publications

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“…In particular, for a static case, assuming also T = 0, expression Eq. (48) coincides with its counterpart derived in [14]. The material properties shown in Table 1 will be considered during the numerical simulation of Eq.…”

Section: Discussion and Numerical Resultsmentioning

confidence: 82%

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Energy Harvesting Performance of Dynamic Bimorph Thermopiezoelectric Benders with Arbitrary Support Location

Hasanyan

2015

Journal of Thermal Stresses

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A comprehensive theoretical analysis of a dynamic thermoferroelectric pre-stressed bimorph energy harvester is performed. The analysis takes into account pyroelectric and thermal expansion effects and general analytical expressions for the energy conversation coefficients are presented for a bilayer. These derived coefficients (transformation coefficients) are for situation when mechanical, electrical, and thermal fields are present and they are important for sensors, actuators, and energy harvesters. They are a function of material properties, location of boundary conditions, vibration frequency, and in plane compressive/tensile follower force. Numerical simulations of the analytical results are presented. Effects of volume fraction, material properties, applied mechanical loads, and boundary conditions on the harvesting coefficients are shown in the figures. The results for a cantilever and a simply-supported beam are obtained as particular cases. The result for a low frequency (static) system is obtained as a particular case by approaching the vibration frequency to zero. It is shown that volume fraction, material properties, plain compressive/tensile follower force, the location of the boundary conditions, and the vibrational frequency of the bimorph strongly influence the strain distribution, and this in turn influences the charge coefficient and the generation of energy.

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Section: Discussion and Numerical Resultsmentioning

confidence: 82%

“…It should be noted that the derivation in this work can be extended to the magnetothermoelectroelastic shape memory alloy (SMA) composites. For example SMA with PZT-5A and an aluminum substrate is discussed in [14].…”

Section: Discussion and Numerical Resultsmentioning

confidence: 99%

Energy Harvesting Performance of Dynamic Bimorph Thermopiezoelectric Benders with Arbitrary Support Location

Hasanyan

2015

Journal of Thermal Stresses

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“…This phenomenon has been recently explored for energy harvesting applications by coupling a piezoelectric material with an SMA to convert the temperature-induced strain into electric energy [1,2]. Our group has previously presented a hybrid laminated composite material for harvesting quasistatic temperature variations, consisting of piezoelectric PZT-based Macro Fiber Composite (MFC, Smart Material Corp.) and a TiNiCu SMA [3,4].…”

Section: Introductionmentioning

confidence: 99%

Flexible composite thermal energy harvester using piezoelectric PVDF polymer and shape memory alloy

Gusarov¹,

Gimeno²,

Gusarova³

et al. 2015

2015 Transducers - 2015 18th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

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A novel flexible composite thermal energy harvester is presented, which couples pyroelectric and piezoelectric effects of polyvinylidene fluoride (PVDF) with shape memory effect of a TiNiCu alloy. The harvester combines superior flexibility of PVDF with large temperature-induced strain of the shape memory alloy (SMA) to harvest small and quasi-static temperature variations. The composite with a volume of 27.5 mm 3 (post-stamp size) can harvest an energy density of 0.41 mJ/cm 3 per event, i.e. a temperature variation of 20°C. The harvester can directly power a lightemitting diode (LED) without any storage unit. The use of PVDF quadruples the energy, compared to previously reported harvesters based on PZT-fiber composites.

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“…Typically, SMA-based actuators are activated by resistive (Joule) heating [16][17][18][19], a method that also requires an external energy source. In some cases, however, by adequate matching of the SMA phase transformation temperatures to the working environment, the energy required for thermal activation of the SMA can be harvested from changes in the surrounding temperature [20,21]. This can eliminate the need for a dedicated energy source and the associated electronic assemblies, and allow for unlimited working time of the system.…”

Section: Introductionmentioning

confidence: 99%

Self-propagating miniature device based on shape memory alloy

2018

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The development of novel locomotion mechanisms is beneficial for advancing the field of selfpropagating devices, which are implemented in various civilian and military applications. In this work, we present a purely mechanic, mm-sized autonomous device capable of linear propagation on a smooth, relatively flat surface. The locomotion mechanism is driven by a shape memory alloy (SMA) wire that is connected to a metallic, ring-shaped, bias spring. Periodic changes in the temperature in the vicinity of the device activate the SMA wire, and result in alternating contraction-elongation deformations of the SMA-bias spring assembly. These deformations are transferred to a linear back and forth motion of small legs that are attached at the bottom of the ring. To generate locomotion, the general conditions for obtaining asymmetric friction between needle shaped legs and a smooth surface were formulated and validated experimentally. The structure and performance of the device are modeled analytically leading to basic design rules that are validated experimentally by real-time optical tracking of the device's displacements and propagation. In addition, the potential of miniaturization of the presented locomotion concept down to the micro-meter scale is demonstrated.

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Design of Piezo-SMA Composite for Thermal Energy Harvester Under Fluctuating Temperature

Cited by 31 publications

References 18 publications

Energy Harvesting Performance of Dynamic Bimorph Thermopiezoelectric Benders with Arbitrary Support Location

Energy Harvesting Performance of Dynamic Bimorph Thermopiezoelectric Benders with Arbitrary Support Location

Flexible composite thermal energy harvester using piezoelectric PVDF polymer and shape memory alloy

Self-propagating miniature device based on shape memory alloy

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