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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1. Smart Materials and their
Applications in Engineering
Smart Structures
Mohammad Tawfik
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Dr. Mohammad Tawfik
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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…
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Mohammad Tawfik
Smart Material: What?
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6. Smart Structures
Mohammad Tawfik
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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. General purpose oil
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Mohammad Tawfik
Why MR technology?
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Mix them and you are
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done!
Required Materials to
synthesize an MR fluid:
• Lithium grease
Micron-sized iron particles
11. Smart Structures
Mohammad Tawfik
Seat Shock Absorbers
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12. Smart Structures
Mohammad Tawfik
Seat Shock Absorbers
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13. Shape Memory Alloy
Smart Structures
Mohammad Tawfik
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14. • Change mechanical properties with the
change of temperature
• Regain original shape when heated!
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Mohammad Tawfik
Shape Memory Alloy
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28. Smart Structures
Mohammad Tawfik
MEMS Power Generation
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29. Smart Structures
Mohammad Tawfik
Backpack Power Generator
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30. Ionic Polymer Metal Composite
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IPMC
31. • New Material
• Shape is controlled by electric field
• Designed on the molecule level (NANO
technology)
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Mohammad Tawfik
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IPMC
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