Smart Structures

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Smart Structures

  1. 1. Smart Materials and their Applications in Engineering Dr. Mohammad Tawfik
  2. 2. Smart Material: What? <ul><li>Controlled change in properties </li></ul><ul><ul><li>Change in mechanical properties (MR fluids, SMA) </li></ul></ul><ul><ul><li>Change in geometry (Piezoelectric, SMA) </li></ul></ul><ul><li>Energy Converters! </li></ul><ul><ul><li>Mechanical Electrical (Piezoelectric) </li></ul></ul><ul><ul><li>Heat  Mechanical (SMA) </li></ul></ul><ul><ul><li>Mechanical  Heat ( Viscoelastic ) </li></ul></ul><ul><ul><li>Etc… </li></ul></ul>
  3. 3. Smart Materials: Why? j0153598[1] <ul><li>Vibration Damping </li></ul><ul><li>Shape Control </li></ul><ul><li>Noise Reduction </li></ul><ul><li>Vibration/Damage Sensing </li></ul><ul><li>Heat Sensing </li></ul>j0127264[1] j0190173[1] j0320940[1] tn00507_[1]
  4. 4. Smart Structures: Classification Wada, Fanson, and Crawly
  5. 5. Magnetorheological Fluids
  6. 6. MR Fluids <ul><li>How do they work? </li></ul><ul><li>Externally applied magnetic field in a direction normal to the fluid flow direction form dipoles in the iron particles </li></ul><ul><li>Magnetic poles start attracting each others to the direction of the field, hence forming chains </li></ul><ul><li>The chains then form a skeleton within the fluid, which gains the fluid controllable yield stress </li></ul>mr_animation2.gif
  7. 7. Why MR technology? DSC00151.JPG <ul><li>Mix them and you are done! </li></ul>DSC00150.JPG DSC00152.JPG Required Materials to synthesize an MR fluid: <ul><li>Lithium grease </li></ul><ul><li>General purpose oil </li></ul><ul><li>Micron-sized iron particles </li></ul>
  8. 8. MR Fluids
  9. 9. Rabinow and Winslow 1950’s
  10. 10. MR Damper Fabrication <ul><li>Prototype Damper </li></ul>21062007103.jpg
  11. 11. Seat Shock Absorbers
  12. 12. Shape Memory Alloy
  13. 13. Shape Memory Alloy <ul><li>Change mechanical properties with the change of temperature </li></ul><ul><li>Regain original shape when heated! </li></ul>
  14. 14. Shape Memory Alloys
  15. 15. Application
  16. 16. SMA Embedding
  17. 17. Other Applications <ul><li>Dental Fillings </li></ul><ul><li>Artificial Joints </li></ul><ul><li>Heat Valves </li></ul><ul><li>Eye-glasses! </li></ul>
  18. 19. Piezoelectric Materials
  19. 20. Piezoelectric Material <ul><li>Electric Field  Mechanical Strain : Actuator </li></ul><ul><li>Mechanical Stresses  Electrical Potential Field : Sensor </li></ul>
  20. 21. Basic Properties
  21. 22. Piezo-Fiber Composites 13Composites
  22. 23. Active/Macro Fiber Composites AFC MFC
  23. 24. Energy Harvesters
  24. 25. MEMS Power Generation
  25. 26. Backpack Power Generator
  26. 27. Ionic Polymer Metal Composite IPMC
  27. 28. IPMC <ul><li>New Material </li></ul><ul><li>Shape is controlled by electric field </li></ul><ul><li>Designed on the molecule level (NANO technology) </li></ul>
  28. 29. Slow and Fast!
  29. 30. Thank you for your attention! [email_address]

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