Fracture Behavior of Cracked Giant Magnetostrictive Materials in Three‐Point Bending under Magnetic Fields: Strain Energy Density Criterion

Colussi, Marco; Berto, Filippo; Mori, Kazuki; Narita, Fumio

doi:10.1002/adem.201500533

Cited by 16 publications

(10 citation statements)

References 26 publications

(32 reference statements)

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“…It has been found that the critical radius of 0.07 mm, obtained from Equation 13 and recommended in a previous work (Colussi et al, 2016) without considering the loading rate, falls within the range of variation here proposed. In the next figure (Fig.…”

Section: Resultssupporting

confidence: 79%

“…The mesh adopted to compute W had the same grade of refinement adopted in a previous work by the present authors (Colussi et al, 2016), in which models with 6400 elements were used to evaluate the energy release rate by means of J-integral on the same geometry.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…This suggested that the increase of the energy release rate, induced by growing magnetic fields, might be the cause of the resistance decrease. In a recent investigation (Colussi et al, 2016) it has been shown that the SED criterion could be extended to the assessment of brittle behavior of giant magnetostrictive materials, under the same loading condition. Experimental data sets on fracture behavior of Terfenol-D specimens under three-point bending have been extended in this study; in addition, fracture loads were measured in the presence and absence of the magnetic field and at different loading rates.…”

Section: Introductionmentioning

confidence: 99%

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Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

Colussi

Berto

Mori

et al. 2016

American Journal of Engineering and Applied Sciences

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Abstract:The following investigation has the purpose of describing, both experimentally and numerically, the fracture behavior of a giant magnetostrictive alloy commercially known as Terfenol-D. Single-edge precracked specimens have been analyzed via three-point bending tests, measuring fracture loads in the presence and absence of a magnetic field at various loading rates. The Strain Energy Density (SED), averaged in a finite control volume, has recently proved to be an excellent method of predicting brittle failures of cracked, U-and V-notched specimens made out of different materials. The effects of the magnetic field and of the loading rate on Terfenol-D failures have been studied, as well as discussing the ability of SED criterion to seize these effects, by performing coupled-field finite element analyses. Finally, a relationship between the size of the SED's control volume and the loading rate has been proposed and failures have then been estimated in terms of averaged SED.

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Section: Resultssupporting

confidence: 79%

Section: Finite Element Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

Colussi

Berto

Mori

et al. 2016

American Journal of Engineering and Applied Sciences

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“…Colussi et al [166] performed finite element analyses and also discussed the effect of a magnetic field on Terfenol-D fracture resistance in terms of the energy release rate and average strain energy density. Colussi et al [166] performed finite element analyses and also discussed the effect of a magnetic field on Terfenol-D fracture resistance in terms of the energy release rate and average strain energy density.…”

Section: Electromagnetic Fracture Behaviormentioning

confidence: 99%

“…www.advancedsciencenews.com www.aem-journal.com alloy with a crack under a magnetic field and discussed the effect of the field on the fracture load. Colussi et al [166] performed finite element analyses and also discussed the effect of a magnetic field on Terfenol-D fracture resistance in terms of the energy release rate and average strain energy density. The results showed that the fracture load of cracked Terfenol-D alloys, under mode I loading, was greater in the absence of the magnetic field and decreased as the magnetic field increased.…”

Section: Electromagnetic Fracture Behaviormentioning

confidence: 99%

A Review on Piezoelectric, Magnetostrictive, and Magnetoelectric Materials and Device Technologies for Energy Harvesting Applications

2017

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In the coming era of the internet of things (IoT), wireless sensor networks that monitor, detect, and gather data will play a crucial role in advancements in public safety, human healthcare, industrial automation, and energy management. Batteries are currently the power source of choice for operating wireless network devices due to their ease of installation; however, they require periodic replacement due to capacity limitations. Within the scope of the IoT, battery maintenance of the trillion sensor nodes that may be implemented will be practically infeasible from environmental, resource, and labor cost perspectives. In considering individual self-powered sensor nodes, the idea of harvesting energy from ambient vibrations, heat, and electromagnetic waves has recently triggered noticeable research interest in the academic community. This paper gives an overview of energy harvesting materials and systems. Three main categories are presented: piezoelectric ceramics/polymers, magnetostrictive alloys, and magnetoelectric (ME) multiferroic composites. State-of-the-art harvesting materials and structures are presented with a focus on characterization, fabrication, modeling and simulation, and durability and reliability. Some perspectives and challenges for the future development of energy harvesting materials are also highlighted.

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Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

et al. 2018

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The authors investigate the magnetic flux leakage for a class of magnetostrictive FeCo alloys with a notch undergoing compression and impact with respect to energy harvesting. The magnetic flux leakage plays a crucial role in the practical energy transition in terms of the features for energy harvesting. Therefore, the corresponding situations are systematically studied by combining finite element analysis (FEA) with practical experiments. The FeCo alloys are categorized into three groups with different three-dimensional notch shapes, and the depths of the notches are 0, 0.5, and 1 mm, respectively. The parameters in both the simulations and practical tests are completely consistent. The results of compression test carried out with a stepwiseincreasing stress from 0 to 100 MPa reveal that the variations of magnetic induced flux increase with the increasing depth of the notches. The following FEA herein provides a feasible interpretation that the stress concentration around the notch is largely responsible for the notch-induced enhancement. The findings of the impacting experiments simultaneously exhibit an analogous tendency that the output power is proportional to the depth of notch. Furthermore, the stress rate has no obvious effect on the output electricity. The maximum magnitude of the improvement for the output power increases by almost 400% comparing the specimens with notches of 0 and 1 mm. This study indicates a promising feasibility to achieve vibrationenergy harvesting from various irregular components.

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Fracture Behavior of Cracked Giant Magnetostrictive Materials in Three‐Point Bending under Magnetic Fields: Strain Energy Density Criterion

Cited by 16 publications

References 26 publications

Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

A Review on Piezoelectric, Magnetostrictive, and Magnetoelectric Materials and Device Technologies for Energy Harvesting Applications

Enhancement of Inverse Magnetostrictive Effect through Stress Concentration for a Notch‐Introduced FeCo Alloy

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