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Frequency-dependent energy harvesting via magnetic shape memory alloys

Sayyaadi, H ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1088/0964-1726/24/11/115022
  3. Publisher: Institute of Physics Publishing , 2015
  4. Abstract:
  5. This paper is focused on presenting an accurate framework to describe frequency-dependent energy harvesting via magnetic shape memory alloys (MSMAs). Modeling strategy incorporates the phenomenological constitutive model developed formerly together with the magnetic diffusion equation. A hyperbolic hardening function is employed to define reorientation-induced strain hardening in the material, and the diffusion equation is used to add dynamic effects to the model. The MSMA prismatic specimen is surrounded by a pickup coil, and the induced voltage during martensite-variant reorientation is investigated with the help of Faraday's law of magnetic field induction. It has been shown that, in order to harvest the maximum RMS voltage in the MSMA-based energy harvester, an optimum value of bias magnetic field exists, which is the corresponding magnetic field for the start of pseudoelasticity behavior. In addition, to achieve a more compact energy harvester with higher energy density, a specimen with a lower aspect ratio can be chosen. As the main novelty of the paper, it is found that the dynamic effects play a major role in determining the harvested voltage and power, especially for high excitation frequency or specimen thickness
  6. Keywords:
  7. Dynamics effects ; Aspect ratio ; Composite beams and girders ; Constitutive models ; Energy harvesting ; Hardening ; Hyperbolic functions ; Magnetic fields ; Magnetism ; Partial differential equations ; Strain hardening ; Bias magnetic field ; Frequency-dependent ; High excitation frequency ; Higher energy density ; Magnetic field induction ; Magnetic shape memory alloy (MSMAs) ; Martensite variant reorientations ; Shape memory effect
  8. Source: Smart Materials and Structures ; Volume 24, Issue 11 , October , 2015 ; 09641726 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0964-1726/24/11/115022/meta;jsessionid=E832F39BCAEB9D768C68107AAA307029.c1.iopscience.cld.iop.org