Engineer, General Electric Co., San Jose, Calif.
ProfessorPersonal member of ASTM, Stanford University, Stanford, Calif.
Pages: 20 Published: Jan 1970
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)
Paper ID: STP26853S