MCE 230_F10_lec_21 - strain curve(unit energy per unit...

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MCE 230 Materials Science Fall 2010 Lecture - 21
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Mechanical Properties of Metals
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Ductility It measures the degree of plastic deformation If the material has little or no plastic deformation upon fracture----- it is called Brittle Can be expressed as : Percent elongation Or percent reduction in area
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Tensile Properties Yield strength Tensile (ultimate) strength Ductility Resilience Toughness
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Resilience The capacity of a material to absorb energy when is elastically deformed and then upon unloading to have this energy recovered. Modulus of resilience (Ur) (area under the elastic region of the stress-
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Unformatted text preview: strain curve) (unit: energy per unit volume J/m 3 or Pa )  For linear elastic region: Toughness  The ability for a material to absorb energy up to fracture.  Fracture toughness: material’s resistance to fracture  The units for toughness are the same as for resilience (energy per unit volume J/m 3 or Pa )  For a material to be tough it has to have both strength and ductility . Stiffness  Material’s resistance to elastic deformation.  Material with higher modulus of elasticity (E) is stiffer Effect of Temperature Stress-Strain Curves for Iron Concept Check...
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