Effect of the Crack Tip Bifurcation on the Plasticity-Induced Fatigue Propagation in Metallic Materials
Open Access
- 18 June 2021
- Vol. 14 (12), 3385
- https://doi.org/10.3390/ma14123385
Abstract
This article deals with the influence of the crack path branching (at the micro level) on the plasticity-induced fatigue crack growth. With regard to this, a modeling by means of the finite element method was performed considering a cracked panel subjected to tension with different symmetric and asymmetric configurations of the bifurcated crack tip. The results show the appearance of a retardation effect in the growth rate of the bifurcated crack in relation to the growth rate of the fully straight crack in different cases studied, namely: (i) if the two branches of the bifurcation have different initial projected length, the propagation rate is greater at the crack tip corresponding to the long-branch than that of the short-branch, and the long-branch growth rate increases with the decrease of the initial branch angle and of the initial projected short-branch length and with the increase of the intensity of fatigue; (ii) if the two branches of the bifurcation have identical initial projected length, the retardation effect depends on the initial distance between the two bifurcated crack tips, the growth rate going up with the decrease of such a distance and with the increase of the fatigue intensity.This publication has 20 references indexed in Scilit:
- Simulations of fatigue crack growth by blunting–re-sharpening: Plasticity induced crack closure vs. alternative controlling variablesInternational Journal of Fatigue, 2013
- Numerical and experimental analyses of the plasticity-induced fatigue crack growth in high-strength steelsConstruction and Building Materials, 2011
- Finite-deformation analysis of the crack-tip fields under cyclic loadingInternational Journal of Solids and Structures, 2009
- Large crack tip deformations and plastic crack advance during fatigueMaterials Letters, 2007
- Crack retardation equations for the propagation of branched fatigue cracksInternational Journal of Fatigue, 2005
- Stress intensity factor equations for branched crack growthEngineering Fracture Mechanics, 2005
- On fatigue crack growth in ductile materials by crack–tip bluntingJournal of the Mechanics and Physics of Solids, 2004
- Micromechanisms of fatigue crack growth retardation following overloadsEngineering Fracture Mechanics, 1983
- Determination of the growth of branched cracks by numerical methodsEngineering Fracture Mechanics, 1979
- Crack-morphological aspects in fracture mechanicsEngineering Fracture Mechanics, 1975