scholarly journals Sliding mechanisms in tribological contact of TMD-C sputtered coatings

2010 ◽  
Author(s):  
T. Polcar ◽  
A. Cavaleiro
Keyword(s):  
Tribological Contact

Assessment of physical, chemical, and tribochemical properties of biomedical alloys used in explanted modular hip prostheses

2021 ◽  
pp. 095441192110619
Author(s):  
Yesenia Gómez Taborda ◽  
Maryory Gómez Botero ◽  
Juan Guillermo Castaño-González ◽  
Angela Bermúdez-Castañeda
Keyword(s):  
Contact Angle ◽  
Polarization Resistance ◽  
Revision Procedure ◽  
Hip Prostheses ◽  
Physical Chemical ◽  
Surface Performance ◽  
Tissue Reactions ◽  
Pin On Disk ◽  
Tribological Contact

During their service life, modular interfaces experience tribological, and corrosion phenomena that lead to deterioration, which in turn can cause a revision procedure to remove the failed prosthesis. To achieve a clearer understanding of the surface performance of those biomedical alloys and the role of the surface properties in the mechanical and chemical performance, samples were taken from retrieval implants made of Ti6Al4V and Co28Cr6Mo alloys. Polarization resistance and pin-on-disk tests were performed on these samples. Physical properties such as contact angle, roughness, microhardness, and Young’s modulus were determined. A correlation between surface energy and evolution of the tribological contact was observed for both biomedical alloys. In tribocorrosion tests, titanium particles seem to remain in the surface, unlike what is observed in CoCr alloys. These metallic or oxidized particles could cause necrosis or adverse tissue reactions.

Scanning Probe Microscopy Measurements of Friction

MRS Bulletin ◽  
2004 ◽  
Vol 29 (7) ◽  
pp. 478-483 ◽  
Author(s):  
Scott S. Perry
Keyword(s):  
Scanning Probe Microscopy ◽  
Sliding Contact ◽  
Scanning Probe ◽  
Interfacial Friction ◽  
Probe Microscopy ◽  
Frictional Properties ◽  
Single Asperity ◽  
Friction Measurements ◽  
Detection Schemes ◽  
Tribological Contact

AbstractThis article describes the details of scanning probe microscopy measurements of interfacial friction from an experimental perspective. In such studies, the probe tip is taken as a model of a single asperity within a tribological contact, and interfacial forces are measured as a function of the sliding contact of the probe tip with the surface. With appropriate detection schemes, friction and load forces can be monitored simultaneously and used together to describe the frictional properties of the microscopic contact. This article provides a detailed description of the procedures and protocols of friction measurements performed with scanning probe microscopy, the relevant properties of probe tips, and the influence of environment on microscopic friction measurements. In addition, the article provides a brief overview of several categories of friction studies performed with scanning probe microscopy, highlighting the type of materials characterized in these studies as well as the importance and impact of the microscopic measurements.

Spatio-temporal structure in wax–oil gel scraping at a soft tribological contact

2015 ◽  
Vol 88 ◽  
pp. 236-251 ◽  
Author(s):  
Gui-Bin Tan ◽  
Shu-Hai Liu ◽  
De-Guo Wang ◽  
Si-Wei Zhang
Keyword(s):  
Temporal Structure ◽  
Spatio Temporal ◽  
Tribological Contact

Tribological contact stability of hard and soft cleaning projectiles

2014 ◽  
Vol 92 (8) ◽  
pp. 1353-1359 ◽  
Author(s):  
M. Reza Malayeri ◽  
Mohammad R. Jalalirad
Keyword(s):  
Contact Stability ◽  
Tribological Contact

scholarly journals Micromechanical model of dry friction hybrid polymer composite clutch facings

2019 ◽  
Vol 4 (1) ◽  
pp. 335-340
Author(s):  
Roland Biczó ◽  
Gábor Kalácska
Keyword(s):  
Dry Friction ◽  
Micromechanical Model ◽  
Friction Material ◽  
Hybrid Polymer ◽  
Mechanical Stiffness ◽  
Clutch System ◽  
Friction Clutch ◽  
Dry Friction Clutch ◽  
Hybrid Polymer Composite ◽  
Tribological Contact

Modelling the complex coupled thermomechanical and tribological contact of a dry friction clutch system between cast iron flywheel and scatter-wound hybrid composite clutch facing requires a thought through investigation of the friction material properties and behaviour. Challenges of the creation of a mechanical stiffness matrix for such a complex material are described in this paper along with simplification ideas and solutions.

New Design Concepts for the Tribological Contact of Cylinder Block and Valve Plate

2020 ◽  
Author(s):  
Stefan Geffroy ◽  
Stephan Wegner ◽  
Stefan Gels ◽  
Hubertus Murrenhoff ◽  
Katharina Schmitz
Keyword(s):  
High Pressure ◽  
High Efficiency ◽  
High Reliability ◽  
Valve Plate ◽  
Cylinder Block ◽  
Design Concepts ◽  
Additional Pressure ◽  
Simulation Results ◽  
Axial Piston ◽  
Tribological Contact

Abstract Axial piston machines are the most widely used type of hydraulic displacement machines and are characterized by their high reliability and efficiency. However, in order to ensure the high efficiency, the tribological contacts have to be precisely optimized. One of the three essential contacts in axial piston machines is the contact of valve plate and cylinder block, which is the subject of this paper. In a previous research project, a simulation model was built up specifically for the tribological contact of valve plate and cylinder block. A test rig was developed and installed for the validation of the simulation results. Both, the experimental and the simulation results show that the cylinder block tilts to the high-pressure side. It holds this preferred position nearly constantly for the different load situations over one revolution with four or five pistons pressurized with high pressure at the same time. The tilting increases the danger of solid body contact in the area of minimum gap height. In addition, it leads to temperature hot spots. Both effects necessitate the use of coatings as alternatives to the commonly used leaded alloys. This paper presents new design concepts for the optimization of the tribological contact of valve plate and cylinder block. Additional pressure pockets in the valve plate’s high-pressure kidney generate a torque and thus reduce the tilt angle of the cylinder block. By implementing additional pressure pockets at the cylinder block an imbalance results, which prevents a constant preferred position. Both concepts have the aim to reduce the heat concentration and improving the overall behavior of the tribological contact. The development and comparison of these concepts are based on a numerical analysis.

In situ observation of anisotropic tribological contact evolution in 316L steel formed by selective laser melting

Wear ◽  
2021 ◽  
pp. 204193
Author(s):  
Mohanad Bahshwan ◽  
Mark Gee ◽  
John Nunn ◽  
Connor W. Myant ◽  
Tom Reddyhoff
Keyword(s):  
Selective Laser Melting ◽  
In Situ Observation ◽  
Laser Melting ◽  
316L Steel ◽  
Tribological Contact
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