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3D characterisation of RCF crack networks

Johan Ahlström (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Casey Jessop (Institutionen för material- och tillverkningsteknik, Materialteknologi) ; Lars Hammar (Institutionen för material- och tillverkningsteknik, Avancerad oförstörande provning) ; Christer Persson (Institutionen för material- och tillverkningsteknik, Materialteknologi)
MATEC Web of Conferences Vol. 12 (2014),
[Konferensbidrag, refereegranskat]

Rolling contact fatigue (RCF) damage is becoming more frequent with increased traffic and loading conditions in the railway industry. Defects which are characterized by a two-lobe darkened surface and a V-shaped surface-breaking crack are often so-called squats. The origination and propagation of squats in railway rails is the topic of many recent studies; the associated crack networks develop with complicated geometry near the surface of rails that is difficult to characterise using most non-destructive methods. The cracks can be examined with repeated metallographic sectioning, but the process is time-consuming and destructive. In order to reduce time, as well as information and material loss, high-resolution and high-energy X-ray imaging of railway rails was done in the current study. Combining the exposures from a range of angles using image analysis, a 3D representation of the complex crack network is achieved. The latter was complemented with metallographic sectioning to determine the accuracy of prediction of the geometrical reconstruction.



Denna post skapades 2014-07-22. Senast ändrad 2016-11-02.
CPL Pubid: 200655

 

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Institutioner (Chalmers)

Institutionen för material- och tillverkningsteknik, Materialteknologi (2005-2017)
Institutionen för material- och tillverkningsteknik, Avancerad oförstörande provning (2005-2017)

Ämnesområden

Metallurgi och metalliska material

Chalmers infrastruktur