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In this investigation the long-life fatigue strength of sharply notched steel bars was improved by as much as 300 percent with the introduction of compressive self-stresses. Compressive self-stresses were produced by an axial tensile preload. Quantitative estimates of this improvement were made as a function of preload using suitable failure criteria and an analytical estimate of the stable self-stress distribution. The importance of the distribution in depth is demonstrated. A criterion for predicting crack propagation is improved and clarified.
fatigue (materials), residual stress, stresses, notch strength, yield strength, stress concentration, crack initiation, crack propagation, loads (forces)
Engineer, General Electric Co., San Jose, Calif.
ProfessorPersonal member of ASTM, Stanford University, Stanford, Calif.