Enb110 Cheat Sheet

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Engineering Stress-Strain Curve for a Metal

������������������: The maximum engineering stress that can be applied to a specimen before it starts necking. At the necking micro‐voids and cavities are created.

ELASTIC DEFORMATION PLASTIC DEFORMATION NECKING X FAILURE

������������������������������������������ ������������������������������������������������������������������: As the material is deformed beyond yield point, the stress is no longer proportional to strain, and permanent, non-recoverable, or plastic deformation occurs. ������������������������������������������: At UTS, a small constriction or neck begins to form at some point, and all subsequent deformation is confined at this neck. This phenomenon is termed “necking,” continues to thing the specimen until failure.

������  (������������������������������ ������������������������������������): The stress level at which plastic deformation begins (or yielding occurs). It is an important design parameter. ������ (������������������������������������������ ������������������������������������������): Materials resistance to elastic deformation or the degree of materials stiffness. It is the slope of the stress‐strain curve in the elastic region and is defined as the ratio of stress to strain. ������������������������������������������ ������������ ������������������������������������������������������������: Is the capacity of material to absorb energy when it is deformed elastically and then upon unloading the energy is recoverable. It is the area under the stress‐strain curve in the elastic region.

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������������������������ℎ������������������������: This is the area under a Stress-Strain curve which is a measure of the ability of a material to absorb energy up to fracture. Specimen geometry as well as the manner of load application is important in toughness determinations.

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