Investigation of crack propagation scatter in a gear tooth’s root

Pehan, Stanislav; Kramberger, Janez; Flašker, Jože; Zafošnik, Boštjan

doi:10.1016/j.engfracmech.2007.04.005

Cited by 43 publications

(19 citation statements)

References 14 publications

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“…The agreement between the experimental and the numerical results was demonstrated. In addition, fatigue crack trajectory calculated by three-dimensional crack growth modeling was compared with the results from Pehan et al [6] and shown in Fig. 4.8(b).…”

Section: Fatigue Crack Propagation Modelmentioning

confidence: 99%

“…4.8(b). It was noted that a twodimensional crack trajectory was modeled in [6], the crack growth line was the same through the face width of the gear tooth. However, since the three-dimensional crack growth modeling was employed in this Chapter, the crack trajectory was shown to change at different points through the face width.…”

Section: Fatigue Crack Propagation Modelmentioning

confidence: 99%

“…They developed a method to predict two-dimensional fatigue crack growth in a three-dimensional specimen geometry. Besides the numerical studies, some experimental investigations on fatigue mechanisms of gears have been conducted by Pehan et al [6] and Blarasin et al [83]. In addition, many researchers have discussed the effect of contact pressures on the fatigue crack growth in a gear tooth [6,83,87,88].…”

Section: Introductionmentioning

confidence: 99%

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Multiscale modeling and simulation of rolling contact fatigue

Gharehbagh

Ali

2018

International Journal of Fatigue

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iii ABSTRACT In this thesis, a hierarchical multiscale method was developed to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. Although various lubricant alkane chains were considered in the molecular model, the chain length of eight united molecules were mainly employed in this thesis. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nano-particles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to predict rolling contact fatigue life of rolling contact components, including bearing and gear-tooth. Specifically, the fatigue crack initiation of bearing was studied, and then the fatigue crack initiation and propagation in gear-tooth. In addition, the enhancement of gear-tooth fatigue life by using composite patches was discussed as well. It should be noted that the friction coefficient used in the continuum model was calculated in the molecular model. It is one-way message passing in iv the developed multiscale method.Another continuum method was studied and developed in this thesis to provide alternate methods for the continuum model in the proposed multiscale framework.Peridynamics method has advantages in modeling and simulation of discontinuities, including cracks, over the conventional finite element methods. The applications of Peridynamics in predicting fatigue crack initiation and propagation lives were discussed in this thesis. v PUBLIC ABSTRACTThis research aims to develop a hierarchical multiscale method to predict rolling contact fatigue lives of mechanical systems. In the proposed multiscale method, the molecular modeling and simulation of lubricant was conducted to investigate the friction between rolling contact surfaces. The calculated friction coefficient was passed to the continuum model of rolling contact components to predict fatigue lives.Molecular dynamics modeling and simulation of thin film lubrication and lubricated contact surfaces were carried out to investigate mechanisms of hydrodynamic lubrication at nano-scale first. In addition, the effects of temperature and nano-particles (debris) on the friction forces were discussed. It was found that the existing of nanoparticles (debris) could increase the friction force between contact surfaces with hydrodynamic lubrication.In the continuum model of the developed multiscale method, finite element analysis was employed to pred...

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Section: Fatigue Crack Propagation Modelmentioning

confidence: 99%

Section: Fatigue Crack Propagation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiscale modeling and simulation of rolling contact fatigue

Gharehbagh

Ali

2018

International Journal of Fatigue

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“…In this paper, both mentioned methods will serve as a tool to mark the meshing rigidity in both a proper and damaged gear. The use of the numeric methods in the tests of damages in toothed gears may be found in (Chaari et al, 2009, Ciavarella and Demelio, 1999, Ding et al, 1995, Howard et al, 2001, Kramberger et al, 2004, Pehan et al, 1997, Pehan et al, 2008, Zouari et al, 2007.…”

Section: Introductionmentioning

confidence: 99%

Defining the change of meshing rigidity caused by a crack in the gear tooth’s foot

Czech

Folęga²,

Wojnar³

2010

Int. J. Eng. Sci. Tech

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In this paper, research results concerning the influence of the cracks at the base of the tooth of wheel on the change of the wheel rigidity is presented. In order to achieve this, a series of experiments was conducted with the use of models FEM and BEM. The correctness of the models was verified with the use of analytic method, whereas the final results were confirmed in a research experiment conducted on the endurance machine MTS. The achieved results enabled the conduction of research devoted to the possibility of use of simulation models of toothed gears to get the teaching data for artificial neural networks. The best of neural networks correctly worked during tests with real data.

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“…The general types of failure modes (in decreasing order of frequency) include fatigue [6], fracture [7], wear [8], and stress rupture. Gear tooth failures occur in two distinct regions, the tooth flank and the root fillet [9].…”

Section: Introductionmentioning

confidence: 99%

Investigating bending strength of spur gear: A review

2016

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Abstract. Gear tends to play a very vital role in all industries. As other mechanical systems, it is subject to design parameter, installation errors, method of manufacture and load uncertainties arising from randomness. Before engineers could design an efficient and safe gear, it is importance to understand how gear can fail is much needed. This article reviews the methodology used to investigate bending strength of spur gear; Finite Element Method (FEM), Numerical Calculation and Investigational Techniques were usually carried out in order to understand the bending strength of thin-rimmed spur gear. Works and experiment from the literature were studied, and their findings were extracted to understand the methods used. The most common method used to investigate bending strength is the numerical calculation. This method was used with several types of established equations and standards to predict gear failures. Next stage is to simulate the gear using Finite Element Method (FEM) in order to get the analysis of gear strength. The most important stage is to put the gears to physical experiment or testing facilities to determine and validate all data from the numerical calculation and FEM method.

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Investigation of crack propagation scatter in a gear tooth’s root

Cited by 43 publications

References 14 publications

Multiscale modeling and simulation of rolling contact fatigue

Multiscale modeling and simulation of rolling contact fatigue

Defining the change of meshing rigidity caused by a crack in the gear tooth’s foot

Investigating bending strength of spur gear: A review

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