Abstract
steel cylinder in an ordinary tensile test; the quantity a in this figure is the radius of the minimum section of the neck, the quantity ro is the initial radius of the cylinder, and R is the radius of curvature of the outer profile of the cylindrical section at its point of contact P with the minimum section of the neck. By observations on a large number of cylinders constructed from a variety of steels of different composition and heat treatment, Bridgman' was led to the conclusion that the ratio a/R could be expressed in all cases as a function of the natural strain defined as the logarithm of the quantity Ao/A, where Ao is the area of the initial cross section of the cylinder and A is the area of the minimum section of the neck. Figure 2 shows the graph obtained from samples of tempered martensite (steel
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