In this study, a crack initiation life prediction methodology for the tooth bending fatigue of hypoid gears is proposed. This methodology employs a previously developed finite-element based hypoid gear root stress model (Hotait et al. 2011, “An Investigation of Root Stresses of Hypoid Gears with Misalignments,” ASME J. Mech. Des., 133, p. 071006) of face-milled and face-hobbed hypoid gears to establish the multiaxial stress time histories within the root fillet regions. These stress time histories are combined with a multiaxial crack initiation fatigue criterion to predict life distributions along roots of the pinion and the gear. The predictions of the multiaxial fatigue model are compared to those from a conventional uniaxial fatigue model to establish the necessity for a multiaxial approach. The model is exercised with an example face-milled hypoid gear set from an automotive application to demonstrate the impact of various misalignments well as the key cutting tool parameters on the resultant tooth bending lives.
Estimation of Bending Fatigue Life of Hypoid Gears Using a Multiaxial Fatigue Criterion
and Aerospace Engineering,
The Ohio State University,
Contributed by the Power Transmission and Gearing Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received February 3, 2013; final manuscript received June 16, 2013; published online August 21, 2013. Assoc. Editor: Qi Fan.
Hotait, M. A., and Kahraman, A. (August 21, 2013). "Estimation of Bending Fatigue Life of Hypoid Gears Using a Multiaxial Fatigue Criterion." ASME. J. Mech. Des. October 2013; 135(10): 101005. https://doi.org/10.1115/1.4025024
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