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- Title
Modelling of overload effects on fatigue crack initiation in case of carbon steel.
- Authors
Mlikota, M.; Schmauder, S.; Božić, Ž.; Hummel, M.
- Abstract
This paper deals with the modelling of short crack initiation within a microstructure of medium carbon steel under fatigue loading, as well as with the influence of overload on the crack initiation period. Studies on the long crack growth show that the overload introduces first an increase in the crack growth rate that is then followed with a decrease, a so-called retardation. A micro-model containing the microstructure of the material is analysed using the finite element method in combination with a model for crack development - the assessment of number of cycles needed for crack initiation was based on the Tanaka-Mura equation. The analysis brings in a correlation between the crack growth rate and the crack length together with the effects of the overload on the crack growth rate. The overload is found to accelerate the short crack growth; however, the following retardation could not be captured due to the inability of the model to produce residual stresses, which are considered to be the main cause of the retardation effect.
- Subjects
FRACTURES in carbon steel; MICROSTRUCTURE; FATIGUE crack growth; FINITE element method; RESIDUAL stresses
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2017, Vol 40, Issue 8, p1182
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12598