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Auxetic Materials

What's Poisson Ratio?. Ratio of axial and lateral strainsFormulated so most materials with positive value?= -?x = -?y ?z ?z. What are auxetic materials and their properties?. Materials with a negative Poisson ValueDensity may vary from one-trillionth the density of air or 10

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Auxetic Materials

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    1. Auxetic Materials by: Zahra Elkassabgi

    2. Whats Poisson Ratio? Ratio of axial and lateral strains Formulated so most materials with positive value ?= -?x = -?y ?z ?z

    3. What are auxetic materials and their properties? Materials with a negative Poisson Value Density may vary from one-trillionth the density of air or 100 billion times air Formed -460*F or 10,000+ heat of white dwarf stars

    4. Auxetic v. Normal materials Auxetic materials Larger when stretched Smaller when compressed Normal materials Smaller when stretched Larger when compressed

    8. Applications of Auxetic materials Nature Neutron stars White dwarf Skin of a cat Manufactured (still under research) Artificial muscles Artificial arteries Structural connectors

    9. Advantages of auxetic materials Increased shear stiffness Increased plane strain fracture toughness Increased indentation resistance Superior to conventional materials for many practical applications

    10. References http://www.dallasnews.com/sharedconntent/dallas/healthsciences/stories http://silver.neep.wisc.edu/~lakes/PoissonStru.html http://silver.neep.wisc.edu/~lakes/PoissonEnd.html http://silver.neep.wisc.edu/~lakes/Poisson.html -

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