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Image analysis to reveal crack development using a computer simulation of wear and rolling contact fatigue

Lookup NU author(s): Dr David Fletcher, Dr Francis Franklin, Professor Ajay Kapoor

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Abstract

Plastic flow of near-surface rail material under contact loading is a feature of rail/wheel contact, and severe flow typically leads to both wear, and the initiation and development of small surface-breaking cracks. This paper presents results from a ratcheting based computer simulation, which has been developed to allow the simultaneous investigation of wear, crack initiation and early crack propagation. To identify repeatably small crack-like flaws, image analysis is applied to the visual representation of the wearing surface generated by themodel. This representation shows a good similarity to traditional micrographs taken from sections of worn surfaces. The model clearly reveals the interaction of wear with crack development, processes which are linked because wear truncates surface-breaking cracks, and can completely remove small surface-breaking cracks.

Publication metadata

Author(s): Fletcher DI; Kapoor A; Franklin FJ

Publication type: Article

Publication status: Published

Journal: Fatigue and Fracture of Engineering Materials and Structures

Year: 2003

Volume: 26

Issue: 10

Pages: 957-967

ISSN (print): 8756-758X

ISSN (electronic): 1460-2695

Publisher: Wiley-Blackwell Publishing Ltd.

URL: http://dx.doi.org/10.1046/j.1460-2695.2003.00696.x

DOI: 10.1046/j.1460-2695.2003.00696.x

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