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2. Spandex - Wikipedia

   en.wikipedia.org/wiki/Spandex

   Elastic material used in the fabrics of a summer cycling attire comprising a jersey, bib shorts and gloves. Spandex, Lycra, or elastane is a synthetic fiber known for its exceptional elasticity. It is a polyether-polyurea copolymer that was invented in 1958 by chemist Joseph Shivers at DuPont. [1] [2] [3] Yarn of colourless to white Spandex fibers

3. Superhard material - Wikipedia

   en.wikipedia.org/wiki/Superhard_material

   If a material contains many delocalized bonds it is likely to be soft. [10] Somewhat related to hardness is another mechanical property fracture toughness, which is a material's ability to resist breakage from forceful impact (note that this concept is distinct from the notion of toughness). A superhard material is not necessarily "supertough".

4. Cauchy elastic material - Wikipedia

   en.wikipedia.org/wiki/Cauchy_elastic_material

   A Cauchy-elastic material is also called a simple elastic material. It follows from this definition that the stress in a Cauchy-elastic material does not depend on the path of deformation or the history of deformation, or on the time taken to achieve that deformation or the rate at which the state of deformation is reached.

5. Anelasticity - Wikipedia

   en.wikipedia.org/wiki/Anelasticity

   Anelasticity is therefore by the existence of a part of time dependent reaction, in addition to the elastic one in the material considered. It is also usually a very small fraction of the total response and so, in this sense, the usual meaning of "anelasticity" as "without elasticity" is improper in a physical sense.

6. Dynamic modulus - Wikipedia

   en.wikipedia.org/wiki/Dynamic_modulus

   In purely elastic materials the stress and strain occur in phase, so that the response of one occurs simultaneously with the other. In purely viscous materials, there is a phase difference between stress and strain, where strain lags stress by a 90 degree ( π / 2 {\displaystyle \pi /2} radian ) phase lag.

7. Elasticity (physics) - Wikipedia

   en.wikipedia.org/wiki/Elasticity_(physics)

   The elastic behavior of objects that undergo finite deformations has been described using a number of models, such as Cauchy elastic material models, Hypoelastic material models, and Hyperelastic material models. The deformation gradient (F) is the primary deformation measure used in finite strain theory.