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Materials
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Modeling of Coupled Phenomena in Novel Ferromagnetic Materials
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Modeling of Coupled Phenomena in Novel Ferromagnetic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Materials Characterization".

Deadline for manuscript submissions: closed (20 April 2022) | Viewed by 8927

Special Issue Editor

Dr. Krzysztof Chwastek

E-Mail Website
Guest Editor
Faculty of Electrical Engineering, Czestochowa University of Technology, Al. Armii Krajowej 17, 42-201 Częstochowa, Poland
Interests: soft magnetic materials; hysteresis; anisotropy; coupled phenomena; modeling
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Modeling of coupled nonlinear effects (e.g., magnetoelastic, magnetocaloric ones) in novel soft and hard magnetic materials is of practical and theoretical interest. There is a stringent need to develop new types of sensors and actuators for practical applications; on the other side, it is important to understand the mutual interactions within materials in deeper detail.

The scope of the Special Issue is focused on but not limited to:

- Mathematical descriptions of Joule, Matteuci, Wiedemann, Villari, etc. effects;

- Recent advances in hysteresis modeling;

- Magneto-optic effects;

- Materials characterization;

- Diagnostic methods for studying coupled phenomena for nondestructive testing purposes;

- Novel artificial-intelligence-based algorithms for practical applications;

- Case studies.

I invite your contributions to this Special Issue.

Dr. Krzysztof Chwastek
Guest Editor

Manuscript Submission Information

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Keywords

  • hysteresis models
  • magnetoelastic effect
  • effect of temperature
  • pressure on magnetic properties
  • eddy currents
  • magnetostriction
  • novel sensors and actuators
  • nondestructive testing
  • diagnostic methods

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Published Papers (3 papers)

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Research

12 pages, 1119 KiB  
Article
Anhysteretic Magneto-Elastic Behaviour of Terfenol-D: Experiments, Multiscale Modelling and Analytical Formulas
by Laurent Daniel and Mathieu Domenjoud
Materials 2021, 14(18), 5165; https://doi.org/10.3390/ma14185165 - 8 Sep 2021
Cited by 13 | Viewed by 2465
Abstract
Giant magnetostrictive materials such as Terfenol-D and Galfenol are used to design actuators and sensors, converting magnetic input into a mechanical response, or conversely, mechanical input into a magnetic signal. Under standard operating conditions, these materials are subjected to stress. It is therefore [...] Read more.
Giant magnetostrictive materials such as Terfenol-D and Galfenol are used to design actuators and sensors, converting magnetic input into a mechanical response, or conversely, mechanical input into a magnetic signal. Under standard operating conditions, these materials are subjected to stress. It is therefore important to be able to measure, understand and describe their magneto-mechanical behaviour under stress. In this paper, a comprehensive characterisation of the anhysteretic magneto-mechanical behaviour of Terfenol-D was performed. An energy-based multiscale approach was applied to model this behaviour. Finally, it was shown that the strain behaviour of Terfenol-D can be satisfactorily described using an analytical model derived from the full multiscale approach. Full article
(This article belongs to the Special Issue Modeling of Coupled Phenomena in Novel Ferromagnetic Materials)
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18 pages, 8536 KiB  
Article
Thermo-Viscoelastic Response of 3D Braided Composites Based on a Novel FsMsFE Method
by Jun-Jun Zhai, Xiang-Xia Kong and Lu-Chen Wang
Materials 2021, 14(2), 271; https://doi.org/10.3390/ma14020271 - 7 Jan 2021
Cited by 11 | Viewed by 2121
Abstract
A homogenization-based five-step multi-scale finite element (FsMsFE) simulation framework is developed to describe the time-temperature-dependent viscoelastic behavior of 3D braided four-directional composites. The current analysis was performed via three-scale finite element models, the fiber/matrix (microscopic) representative unit cell (RUC) model, the yarn/matrix (mesoscopic) [...] Read more.
A homogenization-based five-step multi-scale finite element (FsMsFE) simulation framework is developed to describe the time-temperature-dependent viscoelastic behavior of 3D braided four-directional composites. The current analysis was performed via three-scale finite element models, the fiber/matrix (microscopic) representative unit cell (RUC) model, the yarn/matrix (mesoscopic) representative unit cell model, and the macroscopic solid model with homogeneous property. Coupling the time-temperature equivalence principle, multi-phase finite element approach, Laplace transformation and Prony series fitting technology, the character of the stress relaxation behaviors at three scales subject to variation in temperature is investigated, and the equivalent time-dependent thermal expansion coefficients (TTEC), the equivalent time-dependent thermal relaxation modulus (TTRM) under micro-scale and meso-scale were predicted. Furthermore, the impacts of temperature, structural parameters and relaxation time on the time-dependent thermo-viscoelastic properties of 3D braided four-directional composites were studied. Full article
(This article belongs to the Special Issue Modeling of Coupled Phenomena in Novel Ferromagnetic Materials)
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14 pages, 6497 KiB  
Article
Magnetic Properties of Silicon Steel after Plastic Deformation
by Andries Daem, Peter Sergeant, Luc Dupré, Somsubhro Chaudhuri, Vitaliy Bliznuk and Leo Kestens
Materials 2020, 13(19), 4361; https://doi.org/10.3390/ma13194361 - 30 Sep 2020
Cited by 27 | Viewed by 3390
Abstract
The energy efficiency of electric machines can be improved by optimizing their manufacturing process. During the manufacturing of ferromagnetic cores, silicon steel sheets are cut and stacked. This process introduces large stresses near cutting edges. The steel near cutting edges is in a [...] Read more.
The energy efficiency of electric machines can be improved by optimizing their manufacturing process. During the manufacturing of ferromagnetic cores, silicon steel sheets are cut and stacked. This process introduces large stresses near cutting edges. The steel near cutting edges is in a plastically deformed stress state without external mechanical load. The magnetic properties of the steel in this stress state are investigated using a custom magnetomechanical measurement setup, stress strain measurements, electrical resistance measurements, and transmission electron microscopic (TEM) measurements. Analysis of the core energy losses is done by means of the loss separation technique. The silicon steel used in this paper is non-grain oriented (NGO) steel grade M270-35A. Three differently cut sets of M270-35A are investigated, which differ in the direction they are cut with respect to the rolling direction. The effect of sample deformation was measured—both before and after mechanical load release—on the magnetization curve and total core energy losses. It is known that the magnetic properties dramatically degrade with increasing sample deformation under mechanical load. In this paper, it was found that when the mechanical load is released, the magnetic properties degrade even further. Loss separation analysis has shown that the hysteresis loss is the main contributor to the additional core losses due to sample deformation. Releasing the mechanical load increased the hysteresis loss up to 270% at 10.4% pre-release strain. At this level of strain, the relative magnetic permeability decreased up to 45% after mechanical load release. Manufacturing processes that introduce plastic deformation are detrimental to the local magnetic material properties. Full article
(This article belongs to the Special Issue Modeling of Coupled Phenomena in Novel Ferromagnetic Materials)
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