Transient non-Newtonian elastohydrodynamics of rough meshing hypoid gear teeth subjected to complex contact kinematics

Sivayogan, Gajarajan; Rahmani, Ramin; Rahnejat, Homer

doi:10.1016/j.triboint.2021.107398

Cited by 7 publications

(3 citation statements)

References 59 publications

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“…Progressively, many rolling and sliding contacts are subjected to high, variable, and often impulsive loads. These include the meshing of gear teeth pairs in automotive transmissions or differentials [1][2][3][4] or in wind turbines subjected to external variable wind and gust loading [5,6]. Variations in applied and impulsive loads, and in some cases, the misalignment of rolling element bearings, can cause excessive contact stresses that often result in the fatigue of mating surfaces and their eventual failure [7,8].…”

Section: Introductionmentioning

confidence: 99%

Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts

Johns-Rahnejat,

Dolatabadi,

Rahnejat

2024

Lubricants

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Machines operate under increasingly harsher contact conditions, causing significant wear and contact fatigue. Sub-surface stresses are responsible for the premature contact fatigue of rolling element bearings, meshing gears, and cam–follower pairs. Surface protection measures include hard, wear-resistant coatings. Traditionally, contact integrity has been predicted using classical Hertzian contact mechanics. However, the theory is only applicable when the contact between a pair of ellipsoidal solids of revolution may be considered as a rigid indenter penetrating a semi-infinite elastic half-space. Many coatings act as thin bonded elastic layers that undergo considerably higher pressures than those predicted by the classical theory. Furthermore, inelastic deformation of bonded solids can cause plastic flow, work-hardening, and elastoplastic behaviour. This paper presents a comprehensive, integrated contact mechanics analysis that includes induced sub-surface stresses in concentrated counterformal finite line contacts for all the aforementioned cases. Generated pressures and deformation are predicted for hard coated surfaces, for which there is a dearth of relevant analysis. The contact characteristics, which are of particular practical significance, of many hard, wear-resistant advanced coatings are also studied. The paper clearly demonstrates the importance of using efficient semi-analytical, detailed holistic contact mechanics rather than the classical idealised methods or empirical numerical ones such as FEA. The novel approach presented for the finite line contact of thin-layered bonded solids has not hitherto been reported in the open literature.

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Section: Introductionmentioning

confidence: 99%

Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts

Johns-Rahnejat,

Dolatabadi,

Rahnejat

2024

Lubricants

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“…In recent years, research on gear lubrication has further expanded to encompass thermal elastohydrodynamic lubrication [7,8] and the study of lubricants [9,10]. Sivayogan et al [11] have further studied the transient non-Newtonian elastohydrodynamics of rough meshing tooth surfaces under complex contact kinematics. From the literature review, it can be seen that basic research on gear lubrication characteristics has been relatively well-established.…”

Section: Introductionmentioning

confidence: 99%

Study on the Dynamic Characteristics of Gears Considering Surface Topography in a Mixed Lubrication State

Cheng,

Ma,

et al. 2023

Lubricants

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Based on mixed lubrication analysis, considering the influence of rough interface contact stiffness, contact damping, and interface friction on the gear transmission system, the relationship between interface contact and the overall performance of the gear transmission system has been established. First, the surface topography is characterized using statistical parameters of rough surfaces, and the contact stiffness and damping for tooth surfaces with different roughnesses are calculated. Subsequently, a six degree of freedom gear tribo-dynamics coupling model is developed. Finally, the established tribo-dynamics model is employed to investigate the relationship between surface roughness and the overall performance of the gear transmission system. This study provides a more intimate connection between the contact interface and the general behavior of the gear transmission system, enabling a better representation of real-world engineering problems. The research findings reveal that contact stiffness and damping decrease with increasing surface roughness. Higher roughness leads to greater gear vibration amplitude. Moreover, elevated surface roughness results in intensified meshing force and more significant energy loss. Surprisingly, when the roughness is appropriate, gears with rough surfaces lose less energy than those with smooth surfaces.

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“…On the other hand, the shear-thinning and thermal effects can significantly affect both film thickness and friction, mainly at high shear rate [16,28,[34][35][36][37][38]. Habchi et al [39] have suggested using the Weissenberg number to check whether shear-thinning occurs, and the Nahme-Griffith number to assess if the viscous dissipation affects the viscosity in a substantial manner.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Approach for Predicting EHL Friction: Usefulness and Limitations

et al. 2022

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The article studies the friction coefficient in elastohydrodynamic lubrication (EHL) by means of analytically obtained equations for different contact geometries. The introduction of some simplifications allows for the simultaneous consideration of piezoviscous, pseudoplastic and thermal phenomena, resulting in complete and realistic models, which provide results in a quick and easy manner. The predictive potential of this analytical approach is analyzed by comparing the estimates of friction with full-EHL simulations and experimental data under different operating conditions. The results obtained allow us to discuss the influence of some assumptions taken into account and the scope of applicability of the models, in order to determine their usefulness and limitations.

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Transient non-Newtonian elastohydrodynamics of rough meshing hypoid gear teeth subjected to complex contact kinematics

Cited by 7 publications

References 59 publications

Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts

Elastic and Elastoplastic Contact Mechanics of Concentrated Coated Contacts

Study on the Dynamic Characteristics of Gears Considering Surface Topography in a Mixed Lubrication State

An Analytical Approach for Predicting EHL Friction: Usefulness and Limitations

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