Analysis of stresses and deformations of elements of axle boxes and improvement of their shape

The development of constructive recommendations aimed at increasing the service life of roller bearings of axle boxes of railway cars is described. The elastic volumetric stress-strain state of the bearing elements of the bearings under consideration is analyzed. Numerical analysis of the correspond...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-02, Vol.760 (1), p.12064
Main Authors: Tsvik, L B, Tarmaev, A A, Bocharov, I S, Eremeev, V K
Format: Article
Language:English
Subjects:
Axleboxes
Chamfering
Circuits
Contact pressure
Contact stresses
Contour rolling
Curvature
Finite element method
Nastran
Numerical analysis
Railroad cars
Roller bearings
Rounding
Service life
Smoothness
Strain
Stress concentration
Stress-strain relationships
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Summary:The development of constructive recommendations aimed at increasing the service life of roller bearings of axle boxes of railway cars is described. The elastic volumetric stress-strain state of the bearing elements of the bearings under consideration is analyzed. Numerical analysis of the corresponding mathematical models was carried out using the finite element method in the NX NASTRAN software environment. It is shown that near the edge of the roller with chamfer-rounding, a stress concentration arises, caused by insufficient smoothness of the contour line of the axial section of the roller. It is noted that this concentration is caused by the fact that the line of the contour under consideration has a finite specified curvature in the section corresponding to the chamfer and almost zero curvature in the adjacent straight section corresponding to the cylindrical surface of the roller. It is shown that the use of smoother contour lines for the marginal zone of a roller more than doubles the maximum value of the stress intensity in the boundary zone under consideration and accordingly increases the cyclic life of the bearing. The proposed smoothing of the line of the considered circuit allows one not only to unload the edge of the roller but also to reduce the contact pressure in its middle part. At the same time the stress-strain state of the roller becomes more uniform by increasing the smoothness of the contour line in the area of the roller's edge and simultaneously reducing the degree of bombing (barrel-shaped) its cylindrical surface.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/760/1/012064