Aero495 Smart seminar

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  • 1. Smart Materials and their Applications in Engineering Dr. Mohammad Tawfik
  • 2. 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…
  • 3. Smart Materials: Why? • Vibration Damping • Shape Control • Noise Reduction • Vibration/Damage Sensing • Heat Sensing
  • 4. Smart Structures: Classification Wada, Fanson, and Crawly
  • 5. Magnetorheological Fluids
  • 6. 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
  • 7. Why MR technology? Required Materials to synthesize an MR fluid:  General purpose oil • Lithium grease  Micron-sized iron particles Mix them and you are done!
  • 8. MR Fluids
  • 9. Rabinow and Winslow 1950’s
  • 10. MR Damper Fabrication Prototype Damper
  • 11. Seat Shock Absorbers
  • 12. Shape Memory Alloy
  • 13. Shape Memory Alloy • Change mechanical properties with the change of temperature • Regain original shape when heated!
  • 14. Shape Memory Alloys
  • 15. Application
  • 16. SMA Embedding
  • 17. Other Applications • Dental Fillings • Artificial Joints • Heat Valves • Eye-glasses!
  • 18. Piezoelectric Materials
  • 19. Piezoelectric Material • Electric Field  Mechanical Strain : Actuator • Mechanical Stresses  Electrical Potential Field : Sensor
  • 20. Basic Properties
  • 21. Piezo-Fiber Composites
  • 22. Active/Macro Fiber Composites
  • 23. Energy Harvesters
  • 24. MEMS Power Generation
  • 25. Backpack Power Generator
  • 26. Ionic Polymer Metal Composite IPMC
  • 27. IPMC • New Material • Shape is controlled by electric field • Designed on the molecule level (NANO technology)
  • 28. Slow and Fast!
  • 29. Homework #1 • Prepare a report and a presentation on tow different smart materials of your choice • At least three different references • The report and presentation should reflect good understanding of the subject matter • DO NOT copy sentences or paragraphs from references • Due 27/9/2010