ELASTIC!@!!!!
No offense but if you know what plastic and elastic deformation is you should know that once a metal enters its plastic range it cannot return to its original length. You should also realize that each successive loading cycle will eventually cause the metal to fail.
An example of this is bending a paper clip back and forth until it breaks.
Adam Borkowski has written: 'Analysis of skeletal structural systems in the elastic and elastic-plastic range' -- subject(s): Elastic analysis (Engineering), Structural frames
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It also increases. It increases linearly with stress in the elastic range, then increass more rapidly once the material is plastic ( yielded).
Plastic is a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be molded into shape while soft and then set into a rigid or slightly elastic form. Rubber is a tough elastic polymeric substance made from the latex of a tropical plant or synthetically. Hard rubber is a rubber that is stiff and relatively inflexible. It is made by vulcanizing natural rubber with a high percentage of sulfur.
Photo chromic plastic properties are; the rear surface of the glass has a different radius than the front surface of the plastic, so that the space between the lenses forms a tapered gap which is filled by the elastic adhesive. The edge thickness of the elastic adhesive is sufficient to insure that the increase in diameter of the plastic layer with respect to the diameter of the glass layer due to differences in the thermal expansion characteristic of the glass and the plastic will not damage the composite lens even over a temperature range greater than 300° F.
Most of the materials can be considered elastic at least for a specific range. For example, Wood is elastic when we compare it with glass. Their modulus of elasticity cannot be calculate. However;It is anisotropic material. (its elasticity will be change if your loading parallel to its fibers or perpendicular.)
Strees decreases after the plastic range because the material has releived the strees through movement.
Plastic brochure holders come at a pretty cheap range, and usually only cost maybe fifty dollars at most. http://www.plasticfab.com/ has a wide range of holders.
A material is called elastic if the deformation produced in the body is completely recovered after the removal the load. For ideally elastic materials, a single valued (linear) and time independent relation exist between the forces and the deformations. Although it is hard to find an ideally elastic material, most of the materials can be considered elastic at least for a specific range.
Produce in the elastic range of the demand curve
This is the range in which the body operates normally.
leeward