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ITW13 Presentation

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  • 1. Smart Materials and their Applications in Engineering Dr. Mohammad Tawfik
  • 2. Who am I? • Aerospace Engineering Department • Smart Materials and Structures • American University in Cairo • Communication and Leadership Skills
  • 3. Why am I here?
  • 4. To share the fun
  • 5. And maybe … talk about Smart Structures
  • 6. Smart Material: What? • Controlled change in properties – Change in mechanical properties (MR fluids, SMA) – Change in geometry (Piezoelectric, SMA) • Energy Converters! – Mechanical Electrical (Piezoelectric) – Heat  Mechanical (SMA) – Mechanical  Heat (Viscoelastic) – Etc…
  • 7. Smart Materials: Why? • Vibration Damping • Shape Control • Noise Reduction • Vibration/Damage Sensing • Heat Sensing
  • 8. Smart Structures: Classification Wada, Fanson, and Crawly
  • 9. Magnetorheological Fluids
  • 10. MR Fluids How do they work? • Externally applied magnetic field in a direction normal to the fluid flow direction form dipoles in the iron particles • Magnetic poles start attracting each others to the direction of the field, hence forming chains • The chains then form a skeleton within the fluid, which gains the fluid controllable yield stress
  • 11. Why MR technology? Mix them and you are done! Required Materials to synthesize an MR fluid: • Lithium grease  General purpose oil  Micron-sized iron particles
  • 12. Rabinow and Winslow 1950’s
  • 13. • Some Videos
  • 14. Seat Shock Absorbers
  • 15. Shape Memory Alloy
  • 16. Shape Memory Alloy • Change mechanical properties with the change of temperature • Regain original shape when heated!
  • 17. Shape Memory Alloys • Some Videos
  • 18. Application
  • 19. SMA Embedding
  • 20. Other Applications • Dental Fillings • Artificial Joints • Heat Valves • Eye-glasses!
  • 21. Piezoelectric Materials
  • 22. Piezoelectric Material • Electric Field  Mechanical Strain : Actuator • Mechanical Stresses  Electrical Potential Field : Sensor
  • 23. Basic Properties
  • 24. Piezo-Fiber Composites
  • 25. Active/Macro Fiber Composites
  • 26. Energy Harvesters
  • 27. MEMS Power Generation
  • 28. Backpack Power Generator
  • 29. Thank you for your attention! Mohammad.tawfik@gmail.com AerospaceEgypt.WikiSpaces.com Facebook.com/AerospaceEgypt