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Crack path investigations in a pearlitic rail steel after pre-deformation under cyclic Mode-II loading.
- Source :
-
Engineering Failure Analysis . Oct2022, Vol. 140, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- • A pre-strain method to produce large-scale tubular crack growth specimens is presented. • Mode-II fatigue crack growth of severely deformed pearlitic steels was investigated. • Alignment of the microstructure changes the crack path and propagation mechanism. The crack path under cyclic Mode-II loading in undeformed and pre-deformed pearlitic rail steel R260 is investigated. To produce large-scale specimens with pre-deformed microstructures two methods are applied. Firstly, cylinder bars are processed using an axial-torsion machine resulting in a moderate deformation. Secondly, a new high pressure torsion (HPT) setup is developed to achieve a more strongly deformed microstructure. In the fatigue tests, a distinctive change in the crack path is observed. In the undeformed and moderate deformed specimens, the cracks bifurcate and turn into a Mode-I dominated mixed-mode. In the HPT material, the cracks grow in Mode-II without mixed-mode propagation. For rolling contact fatigue cracks in rails these experimental results indicate a strong connection between the propagation mode and the anisotropy of the highly deformed pearlitic microstructure. This microstructure is characteristic near the wheel-rail contact surface. In future, these findings are important to improve numerical-based crack growth prediction models. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 13506307
- Volume :
- 140
- Database :
- Academic Search Index
- Journal :
- Engineering Failure Analysis
- Publication Type :
- Academic Journal
- Accession number :
- 158443192
- Full Text :
- https://doi.org/10.1016/j.engfailanal.2022.106567