INTEMA, University of Mar del Plata-CONICET, J.B. Justo 4302, B7608FDQ, Mar del Plata, Argentina
Abstract:
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 ΔσeR, the position d of the strongest microstructural barrier and the threshold for long cracks, ΔKthR. 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.