Method and system for judging circumferential crack initiation condition of wheel tread of railway wagon

By establishing a dynamic model and dynamic simulation of railway freight cars, and combining Hertzian contact theory and stability theory, the load conditions for circumferential cracks in the tread of railway freight car wheels are determined, which solves the problem of lack of evaluation methods in the existing technology and provides a theoretical basis for improving the crack resistance of wheels.

CN120930306APending Publication Date: 2025-11-11BEIJING JIAOTONG UNIV
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Patent Information

Application Number
CN202510697802.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-28
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

There is a lack of clear methods in the existing technology to determine the load conditions for the initiation of circumferential cracks in the tread of railway freight car wheels, and there is a lack of research, making it impossible to effectively assess the mechanism of their initiation.

Method used

By establishing a dynamic model of railway freight cars, setting track conditions and suspension failure conditions, conducting dynamic simulations, and combining Hertz contact theory and stability theory, drawing wheel stability diagrams, and analyzing the initiation mechanism of circumferential cracks in the wheel tread.

Benefits of technology

A method for evaluating the initiation of circumferential cracks in the tread of railway freight car wheels is provided, the load conditions are clarified, and a theoretical basis is provided for improving the wheel's resistance to circumferential cracks.

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Abstract

The invention provides a method and a system for judging a circumferential crack initiation condition of a wheel tread of a railway wagon. The method comprises the following steps of: establishing a railway wagon dynamic model; based on the action relation between the circumferential cracks and the shear stress borne by the wheels, the bogie working condition with the suspension failure is set in the railway wagon dynamic model; on the basis of the railway wagon dynamics model, statistics is conducted on the dynamics simulation result of each wheel of each bogie working condition, the bogie working condition when transverse force and transverse creep force borne by the wheels are maximum is obtained, and the bogie load working condition when circumferential cracks are generated is judged; based on the preliminarily judged bogie load working condition when the circumferential crack is generated, the maximum Hertz contact stress borne by the wheel is calculated through the Hertz contact theory; based on a dynamic simulation result, the maximum Hertz contact stress borne by the wheel and the shear yield limit of a wheel material, a wheel stability diagram is drawn by combining a stability theory; and judging the mechanism of circumferential crack initiation by analyzing a wheel stability diagram.
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