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Finite Element Modeling and Additive Manufacturing of Meta-Material Bone Implants with Shape Memory Properties

Jalali, Mojtaba | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55861 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Movahhedy, Mohammad Reza; Mohammadi, Kaivan
  7. Abstract:
  8. Millions of people due to factors such as osteoporosis, aging, sports incidents, and accidents face complications from bone fracture injuries every year. Nitinol shape memory alloy and Gyroid metamaterial have attracted researchers to use them as suitable replacements to fill empty areas of broken bones. In this research, numerical modeling and additive manufacturing were used to take advantage of the special properties of both nitinol and gyroid structures. In the modeling section, finite element modeling of the superelastic effect and the one-way shape memory effect of sheet and solid gyroids in cubic and cylindrical geometries with different porosities were done. As a result of the numerical modeling, the adjustability of the mechanical properties by changing the porosity was shown. The numerical results were validated with the data in the literature, and a guideline to bring the experimental results close to the numerical results was presented. Finally, a report and analysis of the selective laser melting additive manufacturing and experiments were presented. The results of this research show that by using the porosity of gyroid structures, it is possible to reduce the defined elastic modulus of 57.142 GPa to 1.34 GPa with a porosity of 80%. In addition, results show superior mechanical properties of the Nitinol sheet gyroids compared to the solid gyroids. Also, by comparing the effect of geometrical parameters, i.e, porosity, unit cell size, and overall size of nitinol network gyroid structures on stiffness, strength, and residual strain, results show that porosity is the most influential factor while other factors with a 95% of confidence level are not significant
  9. Keywords:
  10. Finite Element Modeling ; Additive Manufacturing ; Shape Memory Alloy ; Implants ; Metamaterial ; Bone Implant ; Nitinol Alloy

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