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Unformatted text preview: Chpt 7 mechanical properties Elastic deformation- when stress and strain are proportional, usually up to strains of 0.005 Anelasticity- the time dependent elastic behavior, how some stuff takes time to return to its original shape, for metals it is usually neglected. For some polymers its time takes longer and is called viscoelastic behavior Plastic deformation- permanent deformation. Called slip in crystalline materials Proportional limit- when the stress-strain curve becomes non-linear Yield strength- when the material breaks, where the parallel line intersects the curve. Tensile strength- maximum on the stress-strain curve. Ductility- the measure of the degree of plastic deformation sustained at fracture. Resilience- capacity of a material to absorb energy while being stretched then having that energy recovered when the force is let off Toughness- a materials resistance to fracture when a crack or other defect is present...
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- Spring '08