Slides-Lab_3(2) - Lab #3 Tensile Testing of Materials...

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Lab #3 Tensile Testing of Materials
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Stress-Strain Curve
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Stress-strain curve is obtained by converting load-displacement curve from experiment. Stress is defined as the load over the cross-sectional area of the sample tested. However, it is very tedious to measure the cross- sectional area during deformation. Hence, “engineering stress” is often used. Engineering stress is defined as the load over the initial cross-sectional area of the sample. Strain is a dimensionless number. It is defined as the relative displacement over the gage length of the sample. However, like the cross-sectional area, the gage length is also changing during deformation. Hence, “engineering strain” is often used. Engineering strain is defined as the relative displacement over the gage length. Moreover, to assure uniform deformation within the gage section, an extensometer with an accurate initial reference length is often needed. In this lab, we will not be using the extensometer but rather use a “dog-bone” shape test specimens.
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Slides-Lab_3(2) - Lab #3 Tensile Testing of Materials...

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