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Dielectric%20Elastomers

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Shape memory alloys (SMA) Piezoelectrics. Compared to these dielectric elastomers have: ... Zorpette, Glenn. ' Fly on the Wall.' Red Herring Magazine. October 2000. ... – PowerPoint PPT presentation

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Title: Dielectric%20Elastomers


1
Dielectric Elastomers
  • AE 510 Research Project Presentation
  • By Carl Johnson
  • October 22, 2002

2
How Dielectric Elastomers Work
  • Dielectric Elastomers have a polymer (aka
    plastic) film between two electrodes
  • When an electric field is induced between the
    electrodes the electrostatic forces cause a
    change in shape (see figure)

Ref. 1
3
Governing Equation of Dielectric Elastomers
  • pee0E2
  • Where
  • p is effective compressive stress
  • e is relative dielectric constant
  • e0 is permittivity of free space (a constant)
  • E is strength of electric field between diodes

4
Advantages of Dielectric Elastomers
  • Similar materials include
  • Shape memory alloys (SMA)
  • Piezoelectrics
  • Compared to these dielectric elastomers have
  • Higher energy density
  • Lower weight
  • Higher efficiencies
  • Higher maximum strains

5
Dielectric Elastomer Comparison Chart
Shape Memory Alloys
Piezoelectrics
Dielectric Elastomers
Note Similarity of Dielectric Elastomers and
Natural Muscle
6
Applications Actuators
  • Dielectric elastomers are well suited to
    actuators
  • Their similarity to natural muscle makes them
    ideal for use on robots (see right)
  • They could also be used to motivate insect-like
    micro UAVs
  • Dielectric elastomers could be used for human
    prostheses and make the six million dollar man a
    reality (see title slide)

7
Applications Heel-Strike Generator
  • DoD is using dielectric elastomers to develop a
    heel-strike generator to go in soldiers boots
    that would generate electricity just from walking
  • A dielectric elastomer generator works like an
    actuator in reverse (mechanical-to-electrical
    instead of electrical-to-mechanical energy)

8
References
  • Pelrine, Ron et al. High Strain Actuator
    Materials Based on Dielectric Elastomers. SRI
    International. 2000.
  •  
  • Wingert, Andrew et al. Hyper-Redundant Robot
    Manipulators Actuated by Optimized Binary
    Dielectric Elastomers. Smart Structures and
    Materials Symposium 2002.
  •  
  • http//ndeaa.jpl.nasa.gov/nasa-nde/lommas/eap/EAP-
    web.htm. SRI International Comparison
    Tables/Charts. 2002.
  •  
  • Bar-Cohen, Yoseph. Electroactive Polymers as
    Artificial Muscles Capabilities, Potentials and
    Challenges. Robotics 2000 and Space 2000.
    Albuquerque, NM. 2000.
  •  
  • Pelrine, Ron. And Kornbluh, Roy. Recent Progress
    in Heel-strike Generators using Electroactive
    Polymers. www.darpa.mil/dso/thrust/md/energy/brie
    fings/5sri.pdf
  •  
  • Zorpette, Glenn. Fly on the Wall. Red Herring
    Magazine. October 2000.
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