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Examination of a Helicopter Main Transmission Spiral Bevel Gear Fractures Due to Intergranular Attack and Fatigue

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Abstract

A gear tooth from a helicopter main transmission spiral bevel gear fractured as a result of fatigue that originated from the drive side root radius. However, this fatigue fracture was secondary. The primary fatigue fracture originated adjacent to the fractured tooth at a bolt hole location that attached the spiral bevel gear to a gear shaft. Intergranular features were observed at the primary fatigue origin, which resulted from residual stress induced by abusive machining and a subsequent chemical treatment during manufacturing.

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Authors and Affiliations

  1. Bell Helicopter, 600 E. Hurst Blvd, Hurst, TX, 76053, USA

    Aaron Slager

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  1. Aaron Slager
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Correspondence to Aaron Slager.

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Slager, A. Examination of a Helicopter Main Transmission Spiral Bevel Gear Fractures Due to Intergranular Attack and Fatigue. J Fail. Anal. and Preven. 15, 441–444 (2015). https://doi.org/10.1007/s11668-015-9959-y

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  • DOI: https://doi.org/10.1007/s11668-015-9959-y

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