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By D.E. Johnson, etc.

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7 and Table II based on it is slightly different from the corresponding figure and table published in my original paper on the corrections for the stress distribution at the neck. The reason for this is that at the time of publication of that paper I did not have so many data on which to base the construction of the curve of Fig. 7. Table II has been carried only to the value 4 for the natural strain. The reason for this is that, if the specimen is pulled to higher strains, as is easily possible if the pulling is conducted under hydrostatic pressure, the neck loses its geometrical regularity, the section is no longer circular, and the contour no longer has rotational symmetry.

Not far from the neck the contour of a tension specimen exhibits a point of inflection. The observation was that the parts of the specimen behind the point of inflection are approximately frozen as extension progresses, the region of sensible movement being the region between the point of inflection and the neck. The result is that as drawing progresses the contour of the specimen folds itself down along a fixed curve, as shown by the dotted lines in Fig. 10. Furthermore, the curve along which the contour folds itself is the same for all the grades of steel examined and in all degrees of heat-treatment.

Such an expectation is not implausible, because obviously parts of the specimen at a distance from the neck were flowing at an earlier stage of the process, and these parts, which are frozen at later stages of the process, thus leave a permanent record in the final shape of the tension specimen. The problem is how to interpret the shape. In order to find some answer to this question an elaborate study was made of the shape of the complete tension specimen as a function of the degree of advancement of the pulling process.

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