Investigator: doc. RNDr. Karel Obrtlík, CSc.
Number of Project: 106/01/0376
Agency: Czech Science Foundation
Duration: 01. 01. 2001 - 31. 12. 2003

The project was directed to study the effect of positive mean stress and mean strain on the decisive stages and characteristics of the fatigue process in advanced structural materials (316L austenitic stainless steel and austempered ductile cast iron). Main attention was paid to the effect of cycle asymmetry on short crack growth mechanisms and kinetics, on lifetime and plastic strain localization in low cycle regime and on fatigue life and fatigue limit under high cycle fatigue cycling.

MAN J, OBRTLÍK K, BLOCHWITZ C, POLÁK J: Atomic Force Microscopy of surface relief in individual grains of fatigued 316L austenitic stainless steel. Acta Mater. 50 (2002) 3767–3780.

MAN J, OBRTLÍK K, POLÁK J: Study of surface relief evolution in fatigued 316L austenitic stainless steel by AFM. Mater. Sci. Engng A351 (2003) 123–132.

MAN J, PETRENEC M, OBRTLÍK K, POLÁK J: AFM and TEM study of cyclic slip localization in fatigued ferritic X10CrAl24 stainless steel. Acta Mater. 52 (2004) 5551–5561.

POLÁK J, MAN J, OBRTLÍK K: AFM evidence of surface relief formation and models of fatigue crack nucleation. Int. J. Fatigue 25 (2003) 1027–1036.