Auxetic materials

Ratio of axial and lateral strains

Formulated so most materials with positive value

ν= -Єx = -Єy Єz Єz

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 materials

Larger when stretched

Smaller when compressed

Normal materials

Smaller when stretched

Larger when compressed

Nature

Neutron stars

White dwarf

Skin of a cat

Manufactured(still under research)

Artificial muscles

Artificial arteries

Structural connectors

Increased shear stiffness

Increased plane strain fracture toughness

Increased indentation resistance

Superior to conventional materials for many practical applications