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Dictionary of Industry Terms

    The load per unit of original cross-sectional area at which a marked increase in the deformation of a specimen occurs without increase of load. It is usually determined by the sudden drop of the beam of the testing machine or by use of dividers or by means of an extensometer.

     The stress at which a material exhibits a specified deviation from proportionality of stress and strain.  An offset of 0.2% is used for many metals including steel.  API 5L and API 5LX state that the yield strength shall be the tensile stress required to produce a total elongation of 0.5% of the gauge length as determined by an extensometer or by multiplying dividers.  Usually expressed in pounds per square inch.

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