The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Three non-elliptic contact models, namely Kik–Piotrowski method, STRIPES and ANALYN, are first compared to the Hertz theory and the CONTACT code in terms of the normal contact solution. Further, for the contact models except for CONTACT, the tangential contact solutions are calculated by a modified simplified theory of Kalker (FASTSIM) based on the normal ones to compare with that of CONTACT. Afterwards,...
A 3D explicit finite element model has been developed with ANSYS/Ls-dyna to study the dynamic interaction between a wheelset and a cracked rail at high speeds. Two contact pairs are separately defined in the wheel–rail interface and between the crack faces, for which Coulomb׳s law of friction is implemented. By incorporating a self-developed program, the dynamic stress intensity factors (SIFs) at...
Wheel–rail frictional rolling contact has been solved for linear elasticity and statics and with the half-space assumption in three dimensions. In recent years, the normal contact problem has also been treated in elasticity and elasto-plasticity with the finite element (FE) method; the half-space assumption is dropped. In this paper, a 3D transient FE model is presented to solve both the normal and...
This paper presents evidences obtained by field monitoring, measurement and survey to show the validity of some numerical predictions about squat growth. The predictions concerns a postulated squat growth process, the relationship between the dynamic contact force and the corrugation-like wave pattern that often follows squats, the high frequency wheel–rail interaction related to squats, and the influence...
Nowadays squats are a severe rolling contact problem on some railways. The root causes of it are not yet clear. From railway operation and maintenance points of view, root causes have to be known so that effective maintenance policies and plans can be made based on measurements and prediction. In the present work first a correlation analysis is performed based on measured data and field observations,...
To investigate the influence of carbon fiber oxidation on the tribological behavior of the 3D-braided carbon fiber/nylon composites (C 3D /MCN), C 3D /MCN composites were prepared. The characteristics of carbon fibers with different conditions were characterized. The mechanical property, friction and wear tests of the composites with untreated and treated carbon fabric were performed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.