Evaluating Elastic-Plastic Wavy and Spherical Asperity-Based Statistical and Multi-Scale Rough Surface Contact Models with Deterministic Results

Chu, Nolan; Jackson, Robert L.; Wang, Xianzhang; Gangopadhyay, Arup; Ghaednia, Hamed

doi:10.3390/ma14143864

Cited by 14 publications

(4 citation statements)

References 54 publications

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“…A recent work compared spherical and wavy asperity-based statistical models to a deterministic prediction. The wavy asperity model compared best and will therefore be implemented here [29].…”

Section: Rough Surface Contactmentioning

confidence: 99%

A Mixed Lubrication Model of Piston Rings on Cylinder Liner Contacts Considering Temperature-Dependent Shear Thinning and Elastic–Plastic Contact

Chu

Jackson

Ghaednia³

et al. 2023

Lubricants

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This work develops a numerical methodology for predicting the performance of an automotive piston ring system by considering contact and lubrication mechanics. The rough surface contact mechanics and lubrication occurs on a scale much smaller than the size of the piston rings and therefore the key aspect of the model is an algorithm that simultaneously solves the multiple mechanisms at different scales. The finite element method will be used to model the mechanical deformations of the piston ring surfaces at large scales. The quasi-steady state model includes heat generation due to solid and viscous friction. This heat generation will then be used to predict the temperature rise and thermal effects in the lubricant and component. A statistical rough surface method that renders asperities as elastic–plastic wavy surfaces predicts the solid contact area. The modified Reynolds equation will be solved to consider the effects of mixed hydrodynamic lubrication while using flow factors formulated for actual piston and ring surfaces. The lubricant viscosity depends both on temperature and shear rate. This will allow for the regimes of boundary, mixed, and full-film lubrication to be considered. The model predicts friction for various loads and speeds that are then compared to experimental measurements. Although the contacts operate mostly in the mixed lubrication regime, the model and experiments show changes in friction with load, speed, and temperature.

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Section: Rough Surface Contactmentioning

confidence: 99%

A Mixed Lubrication Model of Piston Rings on Cylinder Liner Contacts Considering Temperature-Dependent Shear Thinning and Elastic–Plastic Contact

Chu

Jackson

Ghaednia³

et al. 2023

Lubricants

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“…[27]. These expressions, together with a statistical model, allow us to derive a more accurate solution to the problem of rough contact, especially at high load values [28,29].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the discrete contact characteristics based on the Greenwood-Williamson model and the localization principle

Yakovenko,

Goryacheva

2024

Friction

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The contact of a rigid body with nominally flat rough surface and an elastic half-space is considered. To solve the contact problem, the Greenwood–Williamson statistical model and the localization principle are used. The developed contact model allows us to investigate the surface approach and the real contact area with taking into account the asperities interaction. It is shown that the mutual influence of asperities changes not only contact characteristics at the macroscale, but also the contact pressure distribution at the microscale. As follows from the results, the inclusion in the contact model of the effect of the mutual influence of asperities is especially significant for studying the real contact area, as well as the contact characteristics at high applied loads. The results calculated according to the proposed approach are in a good agreement with the experimentally observed effects, i.e., the real contact area saturation and the additional compliance exhaustion.

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“…Furthermore, the authors employed finite element analysis to determine the optimal deformation. Chu et al 5 pointed out that many popular models use statistical methods to solve the contact problem. In addition, these models borrow the solution of spherical or paraboloidal contact to represent a single unevenness.…”

Section: Introductionmentioning

confidence: 99%

Analysis of tangential characteristics of the paraboloidal contact model

Guo

Peng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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A paraboloidal contact model with different axial crossing angles is established. The contact model is subjected to a combined action of normal and tangential loads. Based on the Hertzian theory, the contact states of the model under the action of the normal load are obtained by deriving the equations. The contact states include critical interference values of the elastic phase, elastoplastic phase, and plastic phase. Under the action of the normal preload, the tangential stiffness of the contact model is obtained and verified by finite element simulation. Simulation results indicate that tangential displacements of the contact model in the deformation phase correspond well with analytical solution equations. Stresses and strains on the contact surface are also investigated. By employing the proposed contact model, the effects of axial crossing angle, friction factor, focal length, and normal load on mechanical properties are investigated. The paraboloidal contact model is advantageous to contact analysis for paraboloidal gears and cams.

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Evaluating Elastic-Plastic Wavy and Spherical Asperity-Based Statistical and Multi-Scale Rough Surface Contact Models with Deterministic Results

Cited by 14 publications

References 54 publications

A Mixed Lubrication Model of Piston Rings on Cylinder Liner Contacts Considering Temperature-Dependent Shear Thinning and Elastic–Plastic Contact

A Mixed Lubrication Model of Piston Rings on Cylinder Liner Contacts Considering Temperature-Dependent Shear Thinning and Elastic–Plastic Contact

Analysis of the discrete contact characteristics based on the Greenwood-Williamson model and the localization principle

Analysis of tangential characteristics of the paraboloidal contact model

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