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Harvesting Energy from Magnetic Shape Memory Alloys in Plannar Loading

Karamian Manesh, Mohammad Javad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51097 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Sayyadi, Hassan
  7. Abstract:
  8. Harvesting energy by magnetic shape memory alloy has many advantages against other various methods which harvested from environmental vibrations and has been considered due to high long longevity, large strain amplitude and good performance in low frequencies. These materials can display up to % recoverable strain in response to the application of a magnetic field or compressive mechanical stress. Microstructure of these materials changes under applying mechanical loading and/or magnetic field which cause magnetic vector rotating in magnetic domain. Change in magnetization of these materials, lead to harvesting energy by considering Faraday's law of induction. The model of this investigation was obtained to predict the behaviors of these materials under bi-axial mechanical loading based on Kiefer and Lagoudas models and compared with experimental results. The proposed model was extended in two steps regarding to harvesting energy aim. First, the model was used in uniaxial mechanical loading for prediction of harvested energy and it demonstrated acceptable accuracy in prediction of these material behaviors and also it can be used for voltage measurement in these mechanical loading conditions. At second step, a generalized model was extracted for prediction response of these materials which a varying bi-axial compression stress is applied to plan with a bias magnetic field perpendicular to stress plan, synchronously and has been illustrated that the results of model were close to experimental results. Eventually, a model of harvesting energy system was introduced for measuring of harvested energy in this condition and the value of inducted voltage was obtained by this model and the results were analyzed. Finally, defects of modeling and investigational gaps were expressed as future issues depend on this research and prior investigates
  9. Keywords:
  10. Magnetic Shape Memory Alloys (MSMA) ; Magnetization ; Vibrational Energy Harvesting ; Faraday's Induction Law ; Plane Stress

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