Auxetics MEEN 3344

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Auxetics MEEN 3344

• By
• Blake Hudgeons

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What Are Their Characteristics?

• Auxetic materials are any material that thickens
  when stretched and Thins when compressed.
• Known as a negative Poissons Ratio,
• They have both high energy absorption and
  fracture resistance.
• Low density to allow for the pinched areas

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Natural Occurring

• single-crystal arsenic
• catskin
• load-bearing cancellous bone from human shins

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Current Uses

• Pyrolytic graphite for thermal protection in
  aerospace applications.
• Ni3Al in vanes for aircraft gas turbine engines.
• Expanded form of PTFE used to make Gore-Tex.
• Foam mops

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Continued Current Uses

• polymeric and metallic foams
• carbon fibre composite laminates
• microporous polymers

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Possible Uses

• Biomedical-
• Prosthetic materials, surgical implants,
  suture/muscle/ligament anchors and a dilator.
• Filters-
• Any foam or honeycomb filter is a possibility.
• Fibers-
• Bullet proof vests.

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Resources

• http//www.azom.com/details.asp?ArticleID168
• http//en.wikipedia.org/wiki/Auxetic
• http//data.bolton.ac.uk/auxnet/index.html