The contact mechanical nonlinearities of a mathematical model of a railway wheel rolling over corrugated rail
Abstract
The results of the investigations carried out on possible nonlinear contact mechanical effects of a wheel rolling over corrugated rail are discussed. The applied method of investigation takes as a starting point normal force and creep variations calculated by using a linear model of corrugations. Predicted normal loads between wheel and rail were taken as an input for the solution of the normal contact problem using an approximate, numerical method for non-Hertzian contact. The results of normal contact calculations were analyzed from the point of view of the geometry of contact and basic contact mechanical quantities which influence vertical dynamics of the system, generating the creep forces and wear. Similar analysis was carried out for Hertzian assumptions with the use of the same method for non-Hertzian normal contact problem. The main conclusion arrived at is that the discrepancies due to Hertzian description of the contact mechanical part of the linear model against the non-Hertzian description are most strongly pronounced when the wheel traverses the trough of the corrugation and, that might lead to the significant overall discrepancies in predictions obtained with the two different contact mechanical parts of the model.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- September 1991
- Bibcode:
- 1991STIN...9331015P
- Keywords:
-
- Mathematical Models;
- Nonlinear Equations;
- Rolling Contact Loads;
- Creep Analysis;
- Friction Factor;
- Rail Transportation;
- Stress Analysis;
- Structural Design Criteria;
- Wheels;
- Structural Mechanics