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Modeling Magneto-Mechanical Behavior of Porous Magnetic Gel at Large Deformations in External Magnetic Field

Rezaei, Shayan | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54486 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Naghdabadi, Reza
  7. Abstract:
  8. Magnetic gels and ferrogels are smart composite materials made by combining magnetic particles in a polymer matrix. These materials have been considered due to their special properties such as deformation and change of mechanical properties in the presence of external magnetic field. Having polymer properties along with the magnetic properties of metals, have led these materials to many uses such as drug delivery and artificial muscles. The increasing use of these materials has led researchers to continue research in the field of modeling ferrogels. Due to the porous nature of ferrogels, the ability to absorb a lot of liquid and their large deformations in the magnetic field, modeling of these gels with porosity is very important. The aim of this study is to provide a continuum modeling for porous ferrogels in large deformations. To consider the effect of magnetic particles, magnetic thermodynamic free energy relations are used for medium intensity fields where the magnetization of the material does not enter the saturation phase. Two methods have been used to consider the effect of porosity. In the first method biot porosity energy relationship is used while in the second method the effect of porosity is implemented computationally in the finite element code for these materials. The results obtained from this study shows that the ferrogels deformation increases parabolically with the increase of the magnetic field. Also, a porosity of 20% causes up to 50% increase in the deformation of the ferrogels. Therefore, it is important to consider the effect of porosity for modeling these materials in large deformation within medium and high intensity magnetic fields
  9. Keywords:
  10. Large Deformation ; Continuum Mechanics ; Modeling ; Magnetic Gels ; Smart Composite Materials ; Porous Ferrogels

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