THE EFFECT OF SPECIMEN GEOMETRY ON DETERMINATION OF ELONGATION IN SHEET TENSILE SPECIMENS
WATERTOWN ARSENAL LABS MA
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A study was made of the effect of specimen gage length, width and thickness on the elongation as determined in a tentensile test. Hard-drawn copper, annealed copper, 1020 steel, and H 11 steel were studied. Although a number of relationships have been proposed to explain the variation of elongation with gage length, the results show that no one relationship adequately describes the course of the curves. The elongation in 2 inches is found to vary approximately linearly with the specimen area on a log-log plot, showing agreement with Templins equation. The reason for the dependence of elongation on specimen area rather than width-to-thickness ratio, can be seen from a study of the local width, thickness and longitudinal strains.
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