![]() What is actually measured is a force versus displacement curve, but in order to make these results independent of specimen size, the results are usually presented as stress versus strain. When evaluating the mechanical data of a material, it is common to perform a uniaxial tension test. The defining tensor expressions and transformations can be found in many textbooks, as well as through some web links at the end of this blog post, so they will not be given in detail here. In this blog post we will investigate these quantities, discuss why there is a need for so many variations of stresses and strains, and illuminate the consequences for you as a finite element analyst. ![]() It may be a Second Piola-Kirchhoff Stress or a Logarithmic Strain. In structural mechanics you will come across a plethora of stress and strain definitions.
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