A RELATION BETWEEN MAXIMUM LOAD AND NECKING IN A TENSILE TEST AND A NECKING CORRECTION FOR FLOW STRESS.
ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS
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Experiments on soft SAE 1018 steel have shown general agreement with formulae proposed by Beeuwkes stating that incipient necking occurs at a significant strain beyond the maximum load in body-centered cubic metals during a tensile test. The Bridgman necking correction formula using e - e sub n equal to aR applied from incipient necking was not in as good agreement with the experimental data as that of Beeuwkes. The results obtained justify a straight-line extrapolation of the true stresstrue strain curve to represent the corrected flow stressflow strain values from the incipient necking point to fracture when the curve is plotted on a semiarchyperbolic sine graph. Author