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STRESS-STRAIN CURVES

STRESS-STRAIN CURVESD avid RoylanceDepartment of Materials Science and EngineeringMassachusetts Institute of TechnologyCambridge, MA 02139 August 23, 2001 IntroductionStress- strain CURVES are an extremely important graphical measure of a material s mechanicalproperties, and all students of Mechanics of Materials will encounter them often. However, theyare not without some subtlety, especially in the case of ductile materials that can undergo sub-stantial geometrical change during testing. This module will provide an introductory discussionof several points needed to interpret these CURVES , and in doing so will also provide a preliminaryoverview of several aspects of a material s mechanical properties. However, this module willnot attempt to survey the broad range of STRESS-STRAIN CURVES exhibited by modern engineeringmaterials (the atlas by Boyer cited in the References section can be consulted for this).

Figure7:Neckinganddrawingina6-packholder. “True” Stress-Strain Curves Asdiscussedintheprevioussection,theengineeringstress-straincurvemustbeinterpretedwith

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