Smart Materials and their
Applications in Engineering
Dr. Mohammad Tawfik
Who am I?
• Aerospace Engineering Department
• Smart Materials and Structures
• American University in Cairo
• Communicati...
Why am I here?
To share the fun
And maybe … talk about
Smart Structures
Smart Material: What?
• Controlled change in properties
– Change in mechanical properties (MR fluids, SMA)
– Change in geo...
Smart Materials: Why?
• Vibration Damping
• Shape Control
• Noise Reduction
• Vibration/Damage Sensing
• Heat Sensing
Smart Structures: Classification
Wada, Fanson, and Crawly
Magnetorheological Fluids
MR Fluids
How do they work?
• Externally applied magnetic field
in a direction normal to the fluid
flow direction form dip...
Why MR technology?
Mix them and you are done!
Required Materials to
synthesize an MR fluid:
• Lithium grease
 General pur...
Rabinow and Winslow 1950’s
• Some Videos
Seat Shock Absorbers
Shape Memory Alloy
Shape Memory Alloy
• Change mechanical properties with the
change of temperature
• Regain original shape when heated!
Shape Memory Alloys
• Some Videos
Application
SMA Embedding
Other Applications
• Dental Fillings
• Artificial Joints
• Heat Valves
• Eye-glasses!
Piezoelectric Materials
Piezoelectric Material
• Electric Field  Mechanical Strain : Actuator
• Mechanical Stresses  Electrical Potential
Field ...
Basic Properties
Piezo-Fiber Composites
Active/Macro Fiber Composites
Energy Harvesters
MEMS Power Generation
Backpack Power Generator
Thank you for your attention!
Mohammad.tawfik@gmail.com
AerospaceEgypt.WikiSpaces.com
Facebook.com/AerospaceEgypt
ITW13 Presentation
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ITW13 Presentation

  1. 1. Smart Materials and their Applications in Engineering Dr. Mohammad Tawfik
  2. 2. Who am I? • Aerospace Engineering Department • Smart Materials and Structures • American University in Cairo • Communication and Leadership Skills
  3. 3. Why am I here?
  4. 4. To share the fun
  5. 5. And maybe … talk about Smart Structures
  6. 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. 7. Smart Materials: Why? • Vibration Damping • Shape Control • Noise Reduction • Vibration/Damage Sensing • Heat Sensing
  8. 8. Smart Structures: Classification Wada, Fanson, and Crawly
  9. 9. Magnetorheological Fluids
  10. 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. 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. 12. Rabinow and Winslow 1950’s
  13. 13. • Some Videos
  14. 14. Seat Shock Absorbers
  15. 15. Shape Memory Alloy
  16. 16. Shape Memory Alloy • Change mechanical properties with the change of temperature • Regain original shape when heated!
  17. 17. Shape Memory Alloys • Some Videos
  18. 18. Application
  19. 19. SMA Embedding
  20. 20. Other Applications • Dental Fillings • Artificial Joints • Heat Valves • Eye-glasses!
  21. 21. Piezoelectric Materials
  22. 22. Piezoelectric Material • Electric Field  Mechanical Strain : Actuator • Mechanical Stresses  Electrical Potential Field : Sensor
  23. 23. Basic Properties
  24. 24. Piezo-Fiber Composites
  25. 25. Active/Macro Fiber Composites
  26. 26. Energy Harvesters
  27. 27. MEMS Power Generation
  28. 28. Backpack Power Generator
  29. 29. Thank you for your attention! Mohammad.tawfik@gmail.com AerospaceEgypt.WikiSpaces.com Facebook.com/AerospaceEgypt

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