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Civil-Comp Proceedings
ISSN 1759-3433 CCP: 75
PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: B.H.V. Topping and Z. Bittnar
Paper 72
Computational Model for Analysis of Bending Fatigue in Gears J. Kramberger, M. Sraml, S. Glodez, J. Flasker and I. Potrc
Faculty of Mechanical Engineering, University of Maribor, Slovenia Full Bibliographic Reference for this paper
J. Kramberger, M. Sraml, S. Glodez, J. Flasker, I. Potrc, "Computational Model for Analysis of Bending Fatigue in Gears", in B.H.V. Topping, Z. Bittnar, (Editors), "Proceedings of the Sixth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 72, 2002. doi:10.4203/ccp.75.72
Keywords: gears, bending fatigue, service life, fatigue crack initiation, fatigue crack propagation, computational simulations.
Summary
A computational model for determination the service life of gears in regard to
bending fatigue in a tooth root is presented. Gears are very specific machine
parts subjected to fatigue loads (surface contact fatigue and bending fatigue). The
bending fatigue process leading to tooth breakage is divided into crack initiation (
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The model for the fatigue crack initiation presented in this paper is based on the
continuum mechanics approach, where it is assumed that material is homogeneous
and isotropic. The strain-life method (
Gear tooth crack propagation was simulated using a FEM method based
computer program which uses principles of linear elastic fracture mechanics
(LEFM). The initial crack was placed at the previously determined location in the
fillet area of gear tooth. It has been assumed that the initial crack corresponds to the
threshold crack length
The presented model is used for the computational determination of the complete
service life of real spur gear, which is made of high strength alloy steel 42CrMo4
(through-hardened) with Young's modulus
The results of the computational analyses show that the ratio among the periods of initiation and end of propagation (i.e. final breakage) depends on the stress level. At low stress level almost all service life is spent in crack initiation, but at high stress levels the significant part of the life is spent in the crack propagation. It is very important cognition by determination the service life of real gears in the praxis, because majority of them really operate with loading conditions close to the fatigue limit. The computational results correspond well with the available experimental data for the same material and same thermal treatment as used in this study. References
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