Introduction to Smart Materials

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Introduction to smart materials and their applications in engineering.
How to prepare MR (Magnetrorheological) fluids at home?
What are Shape Memory Alloys?
What are Piezoelectric materials?

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https://wikicourses.wikispaces.com/Topic04+Smart+Materials

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Introduction to Smart Materials

  1. 1. Smart Materials and their Applications in Engineering Smart Structures Mohammad Tawfik #WikiCourses Dr. Mohammad Tawfik Http://WikiCourses.WikiSpaces.com
  2. 2. • 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… Smart Structures Mohammad Tawfik Smart Material: What? #WikiCourses Http://WikiCourses.WikiSpaces.com
  3. 3. • Vibration Damping • Shape Control • Noise Reduction • Vibration/Damage Sensing • Heat Sensing Smart Structures Mohammad Tawfik Smart Materials: Why? #WikiCourses Http://WikiCourses.WikiSpaces.com
  4. 4. Smart Structures Mohammad Tawfik Smart Structures: Classification #WikiCourses Wada, Fanson, and Crawly Http://WikiCourses.WikiSpaces.com
  5. 5. Magnetorheological Fluids Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com
  6. 6. Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com 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. 7.  General purpose oil Smart Structures Mohammad Tawfik Why MR technology? #WikiCourses Mix them and you are Http://WikiCourses.WikiSpaces.com done! Required Materials to synthesize an MR fluid: • Lithium grease  Micron-sized iron particles
  8. 8. Smart Structures Mohammad Tawfik #WikiCourses MR Fluids Http://WikiCourses.WikiSpaces.com
  9. 9. Smart Structures Mohammad Tawfik Rabinow and Winslow 1950’s #WikiCourses Http://WikiCourses.WikiSpaces.com
  10. 10. Smart Structures Mohammad Tawfik #WikiCourses MR Damper Fabrication Http://WikiCourses.WikiSpaces.com Prototype Damper
  11. 11. Smart Structures Mohammad Tawfik Seat Shock Absorbers #WikiCourses Http://WikiCourses.WikiSpaces.com
  12. 12. Smart Structures Mohammad Tawfik Seat Shock Absorbers #WikiCourses Http://WikiCourses.WikiSpaces.com
  13. 13. Shape Memory Alloy Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com
  14. 14. • Change mechanical properties with the change of temperature • Regain original shape when heated! Smart Structures Mohammad Tawfik Shape Memory Alloy #WikiCourses Http://WikiCourses.WikiSpaces.com
  15. 15. Smart Structures Mohammad Tawfik Shape Memory Alloys #WikiCourses Http://WikiCourses.WikiSpaces.com
  16. 16. Smart Structures Mohammad Tawfik Shape Memory Alloys #WikiCourses Http://WikiCourses.WikiSpaces.com
  17. 17. Smart Structures Mohammad Tawfik #WikiCourses Application Http://WikiCourses.WikiSpaces.com
  18. 18. Smart Structures Mohammad Tawfik #WikiCourses SMA Embedding Http://WikiCourses.WikiSpaces.com
  19. 19. Smart Structures Mohammad Tawfik Other Applications #WikiCourses Http://WikiCourses.WikiSpaces.com • Dental Fillings • Artificial Joints • Heat Valves • Eye-glasses!
  20. 20. Smart Structures Mohammad Tawfik Shape Memory Alloys #WikiCourses Http://WikiCourses.WikiSpaces.com
  21. 21. Smart Structures Mohammad Tawfik Shape Memory Alloys #WikiCourses Http://WikiCourses.WikiSpaces.com
  22. 22. Piezoelectric Materials Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com
  23. 23. • Electric Field  Mechanical Strain : Actuator • Mechanical Stresses  Electrical Potential Field : Sensor Smart Structures Mohammad Tawfik Piezoelectric Material #WikiCourses Http://WikiCourses.WikiSpaces.com
  24. 24. Smart Structures Mohammad Tawfik #WikiCourses Basic Properties Http://WikiCourses.WikiSpaces.com
  25. 25. Smart Structures Mohammad Tawfik Piezo-Fiber Composites #WikiCourses Http://WikiCourses.WikiSpaces.com
  26. 26. Smart Structures Mohammad Tawfik Active/Macro Fiber Composites #WikiCourses Http://WikiCourses.WikiSpaces.com
  27. 27. Smart Structures Mohammad Tawfik Energy Harvesters #WikiCourses Http://WikiCourses.WikiSpaces.com
  28. 28. Smart Structures Mohammad Tawfik MEMS Power Generation #WikiCourses Http://WikiCourses.WikiSpaces.com
  29. 29. Smart Structures Mohammad Tawfik Backpack Power Generator #WikiCourses Http://WikiCourses.WikiSpaces.com
  30. 30. Ionic Polymer Metal Composite Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com IPMC
  31. 31. • New Material • Shape is controlled by electric field • Designed on the molecule level (NANO technology) Smart Structures Mohammad Tawfik #WikiCourses IPMC Http://WikiCourses.WikiSpaces.com
  32. 32. Smart Structures Mohammad Tawfik #WikiCourses Slow and Fast! Http://WikiCourses.WikiSpaces.com
  33. 33. Thank you for your attention! Mohammad.tawfik@gmail.com Smart Structures Mohammad Tawfik #WikiCourses Http://WikiCourses.WikiSpaces.com

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