Correlation between Fatigue Crack Propagation and Low Cycle Fatigue Properties
ILLINOIS UNIV AT URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS
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Fatigue crack propagation is treated as a succession of fatigue crack initiation events. The cyclic stress and strain experienced by each element ahead of the crack tip is computed by means of an elastic-plastic analysis of the crack tip region. The attendant cumulative fatigue damage is computed in terms of low cycle fatigue properties of the metal. This permits a correlation to be made between the fatigue crack propagation resistance of a metal and its resistance to fatigue as measured on smooth specimens. Fatigue crack propagation data for eight steels from Barsoms work are compared with predictions from the analysis using low cycle fatigue properties and values of rho based on Gurlands study of the microstructural elements responsible for strengthening in steels.
- Properties of Metals and Alloys