Content uploaded by Damir Jelaska
Author content
All content in this area was uploaded by Damir Jelaska on Oct 20, 2015
Content may be subject to copyright.
A preview of the PDF is not available
Numerical Modelling of Gear Tooth Root Fatigue Behaviour
Figures
Figures - uploaded by Damir Jelaska
Author content
All figure content in this area was uploaded by Damir Jelaska
Content may be subject to copyright.
The crack initiation period in an originally defect-free component can be a significant portion of its total fatigue life. The initiation phase is generally believed to constitute the nucleation and growth of short cracks, but the threshold crack length at which initiation occurs lacks a uniform definition. Moreover, available methods for predicting fatigue damage growth usually require an existing flaw (e.g. Paris law) and may be difficult to apply to the initiation phase. This paper presents a continuum damage mechanics-based approach that estimates cumulative fatigue damage, and predicts crack initiation from fundamental principles of thermodynamics and mechanics. Assuming that fatigue damage prior to localization occurs close to a state of thermodynamic equilibrium, a differential equation of isotropic damage growth under uniaxial loading is derived that is amenable to closed-form solution. Damage, as a function of the number of cycles, is computed in a recursive manner using readily available material parameters. Even though most fatigue data are obtained under constant amplitude loading conditions, most engineering systems are subjected to variable amplitude loading, which can be accommodated easily by the recursive nature of the proposed method. The predictions are compared with available experimental results.
Analysis of short fatigue crack on gear teeth
- B Aberšek
B. Aberšek (1993), Analysis of short fatigue crack on gear teeth, Ph.D. thesis,
University of Maribor, Faculty of Mechanical Engineering, Maribor.
- S Manson
S. Manson (1953), Proc.Heat Transfer Symp., Univ. Michigan, Res. Inst., 9-75.
- T J R Nicholas
- J R Zuiker
T. J. R. Nicholas and J. R. Zuiker (1996), Int. J. Fracture, 80, 219-235.
- D G Shang
- W X Yao
- D J Wang
D.G. Shang, W.X. Yao and D.J. Wang (1998), Int. J. Fatigue, 20, 683-687.
- W Cheng
W. Cheng et al. (1994), ASME J. Tribology, 116, 2-8.
- J F Tavernelli
- L F Coffin
J.F. Tavernelli, L. F. Coffin (1959), Trans. Amer. Soc. of Metals, 51, 438-450.
Calculation of Load Capacity of Spur and Helical Gears
ISO 6336 (1993), Calculation of Load Capacity of Spur and Helical Gears.
- S Glodež
- J Flašker
- Z Ren
S. Glodež, J. Flašker, Z. Ren (1997), Fatigue Fract. Eng. Mat. Struct., 20, 71-83.
- S Glodež
- H Winter
- H P Stüwe
S. Glodež, H. Winter and H.P. Stüwe (1997), Wear, 208, 177-183.