Title:	Influence of humidity of environment on fatigue crack propagation in railway axle
Authors:	Náhlík, L. Pokorný, P. Vojtek, T. Hutař, P.
Citation:	Computational mechanics 2018: book of extended abstracts: 34th conference with international participation, p. 69-70.
Issue Date:	2018
Publisher:	Západočeská univerzita v Plzni
Document type:	konferenční příspěvek conferenceObject
URI:	http://hdl.handle.net/11025/30812 https://www.zcu.cz/export/sites/zcu/pracoviste/vyd/online/FAV_Computational_Mechanics_2018.pdf
ISBN:	978-80-261-0819-1
Keywords:	vlhkost;železniční náprava;šíření trhlin;zkoušení materiálu
Keywords in different language:	humidity;railway axle;crack propagation;material testing
Abstract in different language:	The presentation is devoted to the crack propagation in the railway axle made of EA4T steel. The propagating fatigue crack is subjected to the different kinds of crack closure. The paper describes contribution of plasticity induced crack closure, roughness induced crack closure and oxide induced crack closure to the total crack closure and their influence on the residual fatigue lifetime of the railway axle. Special attention is devoted to the influence of humidity of the air to the fatigue crack propagation and railway axle residual fatigue lifetime. Fig.1 shows detail of fracture surfaces with different width of oxide layers occurred during fatigue testing under different humidity of laboratory air. It is evident the increase of oxides on the fracture surfaces with the increase of absolute air humidity. The experimental results were obtained using chamber developed at Institute of Physics of Materials CAS for fatigue testing machine, which enables fatigue tests under different air humidity. The chamber used is shown in Fig. 2.
Rights:	Copyright © 2018 University of West Bohemia, Plzeň, Czech Republic
Appears in Collections:	Computational mechanics 2018 Computational mechanics 2018

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