Inverkan av anisotropi på utmattningsprickor under rullkontakt (CHARMEC MU34)
Forskningsprojekt, 2015 – 2020

Rolling Contact Fatigue (RCF) crack initiation is often connected to the accumulation of plastic deformation in the surface layer of rail and wheel. The behaviour and strength of this highly deformed layer are thus key properties of a rail or wheel material. Microhardness and 3D head check crack geometry analyses of the surface layer of a rail (from field) were conducted in project MU24 and the modelling of anisotropic evolution and response of highly deformed pearlitic steel was developed in project MU19. The modelling was validated against wire-drawing results from the literature as well as high-pressure torsion tests and micropillar tests performed at Erich Schmid Institute in Leoben (Austria). A new biaxial tension and torsion testing machine at the Department of Materials and Manufacturing Technology (now Industrial and Materials Science) will make it possible to perform laboratory tests on rail and wheel materials in more realistic loading conditions than earlier. Aims of the current project are (1) to find ways to produce anisotropy (by predeformation) of the rail material similar to what is found in rails in field, (2) to determine the multiaxial cyclic behaviour of rail steel in the biaxial testing machine, (3) to utilize and further develop cyclic material models from, e g, project MU19, that take anisotropy into account, and (4) to analyse crack initiation and formulate crack initiation criteria. The ultimate goal is to increase the understanding of the role of the microstructure development in different rail materials subjected to realistic traffic loading conditions.

This is a doctoral project. Mr Knut Andreas Meyer (now doctor)  is the doctoral student and Professor Magnus Ekh the project leader and supervisor. Professor Johan Ahlström is assistant supervisor. Knut Andreas Meyer successfully defended his doctoral dissertation on 4 October 2019 and continues as researcher in the project.  




Knut Andreas Meyer (kontakt)

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik

Johan Ahlström


Magnus Ekh

Chalmers, Industri- och materialvetenskap, Material- och beräkningsmekanik


Abetong AB

Växjö, Sweden

Atkins Sverige AB

Göteborg, Sweden

Bombardier Transportation GmbH

Siegen, Germany

Faiveley Transport Nordic AB

Landskrona, Sweden

Green Cargo AB

Solna, Sweden

Lucchini Sweden AB

Surahammar, Sweden


Stockholm, Sweden

SweMaint AB

Göteborg, Sweden


Borlänge, Sweden

voestalpine Schienen GmbH

Leoben, Austria

voestalpine VAE GmbH

Zeltweg, Austria


Europeiska kommissionen (EU)

Finansierar Chalmers deltagande under 2015–2020

Chalmers järnvägsmekanik (CHARMEC)

Finansierar Chalmers deltagande under 2015–2020

Relaterade styrkeområden och infrastruktur

Hållbar utveckling




C3SE (Chalmers Centre for Computational Science and Engineering)





Mer information

Projektets webbplats

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