In this case, the true stress is related to the engineering stress as follows: Similarly, the “Engineering Strain” as defined in uniaxial strain measures is obtained by dividing the elongation by the original length, while the “True Strain” is obtained by taking the natural logarithm :Ĭonsidering the behaviour of metals, at higher strains, the deformation of a metal is volume preserving and thus: If excessive decrease (or increase) in the cross sectional area occurs, then the force should be divided by the actual area (area after deformation) to obtain the “True Stress”: In this case, the stress is termed the “Engineering Stress”. engineering strain” curve.ĭuring material uniaxial tests, the value of the applied stress is obtained by dividing the applied force by the measured initial cross sectional area of the specimen. true strain” curve of a metal given the “engineering stress vs.
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