Image analysis to reveal crack development using a computer simulation of wear and rolling contact fatigue (2003)

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

    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.

      • Date: 17-10-2003
      • Journal: Fatigue and Fracture of Engineering Materials and Structures
      • Volume: 26
      • Issue: 10
      • Pages: 957-967
      • Publisher: Wiley-Blackwell Publishing Ltd.
      • Publication type: Article
      • Bibliographic status: Published

      Keywords: image analysis; rail steel; rolling contact fatigue; simulation; wear


      Dr Francis Franklin