Assessment of natural crack initiation and its propagation in slow speed bearings

M. Elforjani, D. Mba

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)


    Monitoring of bearings is an essential part of most condition monitoring programmes in rotating machinery. This paper demonstrates the use of acoustic emission (AE) measurements to detect, monitor and locate natural defect initiation and propagation in a thrust rolling element bearing. To undertake this task a special purpose test-rig was built that allowed for accelerated natural degradation of a bearing race. It is concluded that sub-surface initiation and subsequent crack propagation can be detected using a range of time and frequency domain analysis techniques on AE's generated from natural degrading bearings. The paper also investigates the source characterisation of AE signals associated with a defective bearing whilst in operation.

    Original languageEnglish
    Pages (from-to)261-275
    Number of pages15
    JournalNondestructive Testing and Evaluation
    Issue number3
    Publication statusPublished - 30 Sept 2009


    • Acoustic emission
    • Bearing life and natural crack initiation
    • Condition monitoring
    • Source location


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