Auxetic Materials (Zahra Elkassabgi)
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Transcript Auxetic Materials (Zahra Elkassabgi)
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?
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
Auxetic v. Normal materials
Auxetic materials
Normal materials
Smaller when stretched
Larger when compressed
Larger when stretched
Smaller when
compressed
Applications of Auxetic materials
Nature
Manufactured
(still under research)
Neutron stars
Artificial muscles
White dwarf
Artificial arteries
Skin of a cat
Structural connectors
Advantages of auxetic materials
Increased shear stiffness
Increased plane strain fracture toughness
Increased indentation resistance
Superior to conventional materials for many
practical applications
References
http://www.dallasnews.com/sharedconntent/dallas/healthscienc
es/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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