Service Loading Analysis of Wind Turbine Gearbox Rolling Bearings Based on X-Ray Diffraction Residual Stress Measurements

Jürgen Gegner; Wolfgang Nierlich

doi:10.4028/www.scientific.net/MSF.768-769.723

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HomeMaterials Science ForumMaterials Science Forum Vols. 768-769Service Loading Analysis of Wind Turbine Gearbox...

Service Loading Analysis of Wind Turbine Gearbox Rolling Bearings Based on X-Ray Diffraction Residual Stress Measurements

Abstract:

Rolling bearings in wind turbine gearboxes occasionally fail prematurely by so-called white etching cracks. The appearance of the damage indicates brittle spontaneous tensile stress induced surface cracking followed by corrosion fatigue driven crack growth. An X-ray diffraction based residual stress analysis reveals vibrations in service as the root cause. The occurrence of high local friction coefficients in the rolling contact is described by a tribological model. Depth profiles of the equivalent shear and normal stresses are compared with residual stress patterns and a relevant fracture strength, respectively. White etching crack failures are reproduced on a rolling contact fatigue test rig under increased mixed friction. Causative vibration loading is evident from residual stress measurements. Cold working compressive residual stresses are an effective countermeasure.

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Periodical:

Materials Science Forum (Volumes 768-769)

Pages:

723-732

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.768-769.723

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Online since:

September 2013

Authors:

Jürgen Gegner, Wolfgang Nierlich

Keywords:

Cold Working, Micro Friction Model, Premature Bearing Failure, Rolling Bearing, Rolling Contact Fatigue Rig Testing, Vibration, Wind Turbine (WT), XRD Material Response Analysis

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References

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