![]() ![]() Conversely, under compressive loading, the true stress is less than the nominal stress.Ĭonsider a sample of initial length L 0, with an initial sectional area A 0. After a finite (plastic) strain, under tensile loading, this area is less than the original area, as a result of the lateral contraction needed to conserve volume, so that the true stress is greater than the nominal stress. The true stress acting on the material is the force divided by the current sectional area. ![]() In fact, these are “ engineering” or “ nominal” values. It is common during uniaxial (tensile or compressive) testing to equate the stress to the force divided by the original sectional area and the strain to the change in length (along the loading direction) divided by the original length. Previous Next True and Nominal Stresses and Strains
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