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An introductory section discusses the importance of stress concentration due to notches, as a cause of failures in service. Resistance of a notched specimen to fatigue and to impact may depend on entirely different properties. This paper considers the influence of notches on fatigue. Section II considers the effect of chemically formed notches, attention being confined to the influence of pitting caused by stressless corrosion. Relationship between tensile strength and the percentage decrease in the fatigue limit for steels and aluminum alloys is illustrated by composite curves. Each of these curves is presumed to represent this relationship for a notch of fairly constant effective sharpness. The three-dimensional relationship between corrosion time, percentage damage, and tensile strength is illustrated and discussed. The general object of section III is to determine whether composite curves of similar form may be obtained by a study of experimental data obtained by a number of investigators with mechanically formed notches. The fact that such graphs have been obtained, each representing the influence of one form of notch on one kind of metal, confirms the conclusion that a stressless corrosion graph of this type represents the influence of a notch of fairly constant effective sharpness. Reasons are discussed for the deviation of individual results from the ideal composite curve for a mechanically formed notch. Section IV considers the relationship between notch sensitivity (as measured by percentage damage) and other properties of metals. The properties considered are: Hysteresis, ductility, and work-hardening capacity. Evidence is presented that scatter of individual results in a composite graph, of the type used, is due largely to differences in tensile work-hardening capacity. Evidence is also presented that notch sensitivity, while depending somewhat on elastic hysteresis, depends largely on work-hardening capacity. Section V considers the influence of notches in diminishing the advantage of superior strength. Section VI is a list of the selected references cited in the text.

Influence of chemically and mechanically formed notches on fatigue of metals