smart structures
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MATHEMATICS (1)
Smart Materials and their Applications in Engineering
Dr. Mohammad Tawfik
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
Smart Materials: Why?
j0153598[1]Vibration Damping
Shape Control
Noise Reduction
Vibration/Damage Sensing
Heat Sensing
j0127264[1]j0190173[1]j0320940[1]tn00507_[1]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 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.gifWhy MR technology?
DSC00151.JPG Mix them and you are done!
DSC00150.JPGDSC00152.JPG Required Materials to synthesize an MR fluid:
Lithium grease
General purpose oil
Micron-sized iron particles
MR Fluids
Rabinow and Winslow 1950s
MR Damper Fabrication
Prototype Damper
21062007103.jpgSeat Shock Absorbers
Shape Memory Alloy
Shape Memory Alloy
Change mechanical properties with the change of temperature
Regain original shape when heated!
Shape Memory Alloys
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 : Sensor
Basic Properties
Piezo-Fiber Composites
13CompositesActive/Macro Fiber Composites
AFCMFCEnergy Harvesters
MEMS Power Generation
Backpack Power Generator
Ionic Polymer Metal Composite
IPMC
IPMC
New Material
Shape is controlled by electric field
Designed on the molecule level (NANO technology)
Slow and Fast!
Thank you for your attention!
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