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Numerical stress analysis of rail rolling contact fatigue cracks

Bogdanski, S. / Olzak, M. / Stupnicki, J.

The paper presents the results of the stress analysis of rail rolling contact fatigue cracks. The basis of the model used in the analysis is the finite element approach which enables the crack tip stress environment to be described by the fracture mechanics crack tip SIFs (stress intensity factors) K(I), (KII) and K(III). The results for a semi-elliptical crack perpendicular to the rail axis and the 'squat' type of crack are presented. An influence of such factors as crack inclination angle, residual stresses, a traction load acting on the rail surface and the pressure of liquid trapped in the crack is presented as the results of two-dimensional modelling. Distributions of contact normal and tangential forces at the rail surface and inside the crack are determined. Variations of the SIFs K(I), K(II) and K(III) for the three-dimensional cases, and K(I), K(II) for the two-dimensional cases during rolling of a wheel over the crack are plotted against the wheel positions. Distributions of the SIFs along the 'squat' type crack front for various locations of the wheel are also presented.

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Numerical stress analysis of rail rolling contact fatigue cracks

Bogdanski, S. / Olzak, M. / Stupnicki, J.

The paper presents the results of the stress analysis of rail rolling contact fatigue cracks. The basis of the model used in the analysis is the finite element approach which enables the crack tip stress environment to be described by the fracture mechanics crack tip SIFs (stress intensity factors) K(I), (KII) and K(III). The results for a semi-elliptical crack perpendicular to the rail axis and the 'squat' type of crack are presented. An influence of such factors as crack inclination angle, residual stresses, a traction load acting on the rail surface and the pressure of liquid trapped in the crack is presented as the results of two-dimensional modelling. Distributions of contact normal and tangential forces at the rail surface and inside the crack are determined. Variations of the SIFs K(I), K(II) and K(III) for the three-dimensional cases, and K(I), K(II) for the two-dimensional cases during rolling of a wheel over the crack are plotted against the wheel positions. Distributions of the SIFs along the 'squat' type crack front for various locations of the wheel are also presented.

Numerical stress analysis of rail rolling contact fatigue cracks

Bogdanski, S. / Olzak, M. / Stupnicki, J.

The paper presents the results of the stress analysis of rail rolling contact fatigue cracks. The basis of the model used in the analysis is the finite element approach which enables the crack tip stress environment to be described by the fracture mechanics crack tip SIFs (stress intensity factors) K(I), (KII) and K(III). The results for a semi-elliptical crack perpendicular to the rail axis and the 'squat' type of crack are presented. An influence of such factors as crack inclination angle, residual stresses, a traction load acting on the rail surface and the pressure of liquid trapped in the crack is presented as the results of two-dimensional modelling. Distributions of contact normal and tangential forces at the rail surface and inside the crack are determined. Variations of the SIFs K(I), K(II) and K(III) for the three-dimensional cases, and K(I), K(II) for the two-dimensional cases during rolling of a wheel over the crack are plotted against the wheel positions. Distributions of the SIFs along the 'squat' type crack front for various locations of the wheel are also presented.

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Title:

Numerical stress analysis of rail rolling contact fatigue cracks

Additional title:

Numerische Spannungsanalyse von Rissen in Schienen durch Wälzkontaktermüdung

Contributors:

Bogdanski, S. (author) / Olzak, M. (author) / Stupnicki, J. (author)

Published in:

International Conference on Contact Mechanics of Rail-Wheel Systems, 4 ; 14-24

Wear - An International Journal on the Science and Technology of Friction, Lubrication and Wear ; 191

Publication date:

1996

Size:

11 Seiten, 15 Bilder, 19 Quellen

ISSN:

DOI:

https://doi.org/10.1016/0043-1648(95)06685-3

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Eisenbahnschiene , Wälzermüdung , Rollkontakt , Ermüdungsriss , Rissausbreitung , Spannungsanalyse , Eigenspannung , Finite-Elemente-Methode , Spannungsintensitätsfaktor , zweidimensionale Darstellung , dreidimensionale Darstellung , Lebensdauer

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