Journal of Theoretical
and Applied Mechanics

55, 4, pp. 1443-1448, Warsaw 2017
DOI: 10.15632/jtam-pl.55.4.1443

Experimental analysis and modelling of fatigue crack initiation mechanisms

Aneta Ustrzycka, Zenon Mróz, Zbigniew L. Kowalewski
The present work is devoted to simulation of fatigue crack initiation for cyclic loading within
the nominal elastic regime. It is assumed that damage growth occurs due to action of mean
stress and its fluctuations induced by crystalline grain inhomogeneity and the free boundary
effect. The macrocrack initiation corresponds to a critical value of accumulated damage.
The modelling of damage growth is supported by Electronic Speckle Pattern Interferometry
(ESPI) apparatus using coherent laser light.
Keywords: fatigue crack initiation, damage evolution, optical methods