Smart Structures
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The document discusses smart materials and their applications in engineering. It defines smart materials as materials that can change their mechanical properties in response to external stimuli like magnetic fields, temperature, or electric currents. Some examples of smart materials mentioned are magnetorheological fluids, shape memory alloys, and piezoelectric materials. The document then provides more details on how these different smart materials work and examples of their applications, such as using shape memory alloys in medical implants or generating electricity with piezoelectric materials.
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Smart Structures
- 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? j0153598[1] Vibration Damping Shape Control Noise Reduction Vibration/Damage Sensing Heat Sensing j0127264[1] j0190173[1] j0320940[1] tn00507_[1]
- 4. Smart Structures: Classification Wada, Fanson, and Crawly
- 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 mr_animation2.gif
- 7. Why MR technology? DSC00151.JPG Mix them and you are done! DSC00150.JPG DSC00152.JPG Required Materials to synthesize an MR fluid: Lithium grease General purpose oil Micron-sized iron particles
- 8. MR Fluids
- 9. Rabinow and Winslow 1950’s
- 10. MR Damper Fabrication Prototype Damper 21062007103.jpg
- 13. Shape Memory Alloy Change mechanical properties with the change of temperature Regain original shape when heated!
- 15. Application
- 16. SMA Embedding
- 17. Other Applications Dental Fillings Artificial Joints Heat Valves Eye-glasses!
- 20. Piezoelectric Material Electric Field Mechanical Strain : Actuator Mechanical Stresses Electrical Potential Field : Sensor
- 21. Basic Properties
- 23. Active/Macro Fiber Composites AFC MFC
- 27. Ionic Polymer Metal Composite IPMC
- 28. IPMC New Material Shape is controlled by electric field Designed on the molecule level (NANO technology)
- 29. Slow and Fast!
- 30. Thank you for your attention! [email_address]