3D characterisation of RCF crack networks
Paper i proceeding, 2014

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.

Författare

Johan Ahlström

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Casey Jessop

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Lars Hammar

Chalmers, Material- och tillverkningsteknik, Avancerad oförstörande provning

Christer Persson

Chalmers, Material- och tillverkningsteknik, Materialteknologi

MATEC Web of Conferences

2261236X (eISSN)

Vol. 12 06001

Ämneskategorier

Metallurgi och metalliska material

DOI

10.1051/matecconf/20141206001

ISBN

9782759812745

Mer information

Skapat

2017-10-07