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Auxetic Materials

Auxetic Materials. by: Zahra Elkassabgi. What’s Poisson Ratio?. Ratio of axial and lateral strains Formulated so most materials with positive value ν= -Єx = -Єy Єz Єz. What are auxetic materials and their properties?.

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Auxetic Materials

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  1. Auxetic Materials by: Zahra Elkassabgi

  2. What’s Poisson Ratio? • Ratio of axial and lateral strains • Formulated so most materials with positive value • ν= -Єx = -Єy Єz Єz

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

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

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

  7. 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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