The Effect of Triaxiality on the Technical Cohesive Strength of Steels

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Abstract
This paper describes the fundamental metal characteristics revealed by means of extensive notched tensile tests. The effects of the three major factors, triaxiality, plastic strain, and stress concentration, can be separated by means of systematic tests covering the dependence of notch strength characteristics upon numerous variables, such as notch radius, notch depth, and hardness (of heat-treated steels). The characteristic strength values supplied by notched-bar tensile tests appear to be of considerably greater practical significance than those obtainable by means of regular tensile tests. The investigations on notched tensile-test bars also furnish an example of a practical approach to a complex fundamental problem which can be solved only by means of correlated and carefully controlled experimentation covering the effects of all pertinent variables.

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