J. Phys. IV France 11 (2001) Pr5-77-Pr5-84
Effect of the discrete nature of plasticity on fatigue crack propagationR. Pippan1, F.O. Riemelmoser2 and H. Kreuzer1
1 Erich Schmid Institute of Materials Science, Austrian Academy of Sciences and Institute of Metal Physics, University Leoben, Austria
2 Fa. HILTI AG, Abbau und Trennsysteme, 9494 Schaan, Liechtenstein
At cyclic plastic crack tip opening displacements smaller than 100 Burgers vectors per cycle the plasticity is significantly constrained by its discrete nature which is the reason for the intrinsic threshold behavior of fatigue cracks. In this paper the effect of grain boundaries and duplex microstructure on this constraint is investigated and the consequences for the interpretation of the intrinsic fatigue crack propagation behavior in ductile metals are discussed.
© EDP Sciences 2001