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Can you choose an arbitrary gauge length for a tensile test if you use the crosshead...

Can you choose an arbitrary gauge length for a tensile test if you use the crosshead motion to measure elongation? Explain why or why not?

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The gauge length affects the elongation of tensile specimen.The % elongation decreases with increasing gauge length. An arbitrary gauge length is not recommended, as it leads to reporting of incorrect fracture elongation. The gauge length needs to be selected to ensure the strain is uniform along the gauge length upto the point of necking, where the stress and strain are proportional. Following necking the force drops and the reduction in area is no longer proportional to the stretching (elongation) of the material and failure occurs.

ASTM E8 recommends, a minimum gauge length of 25 mm for flat tensile specimens. The gauge length needs to be selected with respect to width of the specimen. ASTM and DIN recommends 4:1 ratio of gauge length to width and JIS bar features a 2:1 ratio.

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