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    STP1580

    A Review: The Dilemma With Premature White Etching Crack (WEC) Bearing Failures

    Published: 26 September 2014


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    Abstract

    Wind turbine gearboxes are subjected to a wide variety of operating conditions, some of which may push the bearings beyond their limits. Damage may be done to the bearings resulting in a specific premature failure mode known as white etching cracks (WECs), sometimes called irregular, or white structured flaking (WSF). In this paper, some influencing factors that can lead to WEC failure will be discussed and related to existing root cause hypotheses. From this work, it is clear that a generalized simple root cause is counterproductive, pinpointing the need to carefully evaluate each WEC case in the light of the corresponding application.

    Keywords:

    white etching cracks (WECs), white structure flaking (WSF), white etching phase transformation, adiabatic shear band (ASB), hydrogen, incipient cleavage cracks, rolling contact fatigue (RCF)


    Author Information:

    Stadler, Kenred
    Renewable Energy Application Development Center, SKF GmbH, Schweinfurt,

    Lai, Junbiao
    Engineering and Research Center, SKF B.V., MT Nieuwegein,

    Vegter, Reinder Hindrik
    Engineering and Research Center, SKF B.V., MT Nieuwegein,


    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP158020140046