Publikace detail

Tribological and Materials Aspects of the Railway Wheel / Rail Interaction

Autoři: Beneš Libor | Schmidová Eva

Rok: 2006

Druh publikace: kapitola v odborné knize

Název zdroje: Transport Systems Viewed from Technical and Economical Aspects

Název nakladatele: Univerzita Pardubice

Místo vydání: Pardubice

Strana od-do: 95-100

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Tribologické a materiálové aspekty styku kolo/kolejnice	Tribologické a materiálové aspekty styku kolo/kolejnice
eng	Tribological and Materials Aspects of the Railway Wheel / Rail Interaction	The description of structural changes in railway wheels during operational period. The nature of structure was investigated using light microscopy and microhardness. Due to extreme forces application on the tread surface, crystallic grains are distorted and crushed. This surface changes induce microcracking, that can concentrate stress and accelerate damage. Obtained results show considerable deformation of surface layers (up to approx. 5 mm) as well as initialization of cracks. Microhardness (HV 0.5) proved marked strain hardening up to depth of several tenths of millimeters. Our study characterized two basic mechanisms of cracking formation - thermal initialization and contact-fatigue damage. These two mechanisms can generate different structures, but both contribute to irreversible degradation on the surface of railways wheels.	Transport Systems, technology, tribology, wheel treads

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