Fatigue propagation threshold of short cracks under constant amplitude loading

MIRCO DANIEL CHAPETTI

INTERNATIONAL JOURNAL OF FATIGUE

Elsevier Ltd.

Año: 2003 vol. 25 p. 1319 - 1326

0142-1123

In this study a threshold for fatigue crack propagation as a function of crack length is defined from a depth given by the position d of the strongest microstructural barrier to crack propagation, which defines the plain fatigue limit. The material threshold is estimated from the plain fatigue limit DseR, the position d of the strongest microstructural barrier and the threshold for long cracks, DKthR. The threshold for eight different materials for which experimental results can be obtained from the literature was estimated. Good agreement was observed in all cases. Some quantitative analyses of the fatigue propagation behavior of short cracks are carried out and discussed