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In this work, the finite element method was used to model and simulate the hip joint prosthetic tribosystem. We use an adaptation of the Archard equation to determine the abrasive wear of acetabular cups in UHMWPE as a function of their lateral tilts in relation to the coronal plane. Numerical simulations performed with acetabular cups at tilt angles of 30°, 45°, and 60° presented respectively linear...
The tribological conditions at the contact between the cutting tool and the chip are of great importance when analyzing the machining process. By knowing the contact conditions on the rake face of the cutting tool the wear on the clearance and rake face may be predicted in terms of size and type of wear. A certain value of the surface stresses is often thought of as leading to a higher wear rate of...
Predictive modelling of wear and adhesion at rolling–sliding contacts such as a railway rail and wheel depends on understanding the relationship between slip and shear force at the contact surface, i.e., the creep verses force curve. This paper describes a new approach to creep curve measurement using a twin disc machine running with a continuous programmed variation of creep, enabling an entire creep...
Specially designed steels with carbon contents from 0.6 to 1.0wt% were isothermally transformed at very low temperatures, between 220 and 270°C, in order to obtain a nano-structured bainitic microstructure. It is shown that the wear resistance in dry rolling–sliding of these nano-structured steels is significantly superior to that of bainitic steels transformed at higher temperatures with similar...
This paper describes the tribological functionality of hypereutectic AlSi under conformal contact conditions. Temperature and load bearing tests were performed with a ring-on-disc configuration with steel counterparts under fully formulated engine oil. Tribometric tests show significantly higher wear resistance and loadability of AlSi compared to pure Al. Post test surface characterization by light...
In steam piping systems containing liquid droplets, pipe walls are sometimes damaged by droplet impingement. One of the most important parameters affecting erosion is the impact angle. No research has been conducted on the effect of the impact angle on erosion for pipe steels. In this study, a jet nozzle was used for high pressure impingement tests of S15C, SUS304 and STPA24, and a spray nozzle for...
Polymer gears can be run without lubrication, however, high running temperatures, driven by high contact friction, mean that the operating life of these gears, especially in medium to high power transmission applications, tends to be low and limited by wear. This paper describes an attempt to control friction and wear by reducing the running temperatures by using a series of solid lubricant coatings...
By using an atomic force microscopy, the wear tests of Si(100) surface against SiO 2 microsphere were performed both in water and in air. During the tests, the contact pressure was varied between 0.78GPa and 1.1GPa, the displacement amplitude was set as 250nm and the number of wear cycles was 200. As a comparison, the wear tests of Si(100) surface against diamond tip were also performed in...
The abrasive wear of nanocrystalline Ni–W alloys with grain sizes of 5–105nm has been studied using Taber abrasion testing. The wear resistance of the finest grain size specimen is found to be higher than would be predicted based on hardness alone. This deviation from Archard scaling is traced to mechanically-driven structural evolution, consisting of grain growth and grain boundary relaxation, which...
Cathodic arc evaporation was utilized to synthesize Cr–N, ta–C, Al–Mo–N, Mo–N, Mo–O–N and Mo–Cu–N coatings. The coatings were characterized with respect to their stoichiometry, morphology and mechanical properties. A reciprocating wear test was used to compare the wear behavior for the unpolished coatings under dry conditions and polished coatings under lubricated (Mo-DTC) conditions. The test allows...
Hydrogen-free diamond-like carbon (DLC) coatings were formed using four different deposition methods: trigger-type arc ion plating, laser-discharge-induced arc ion plating, filtered cathodic vacuum arc ion plating and magnetron sputtering. Wear tests were conducted on the coatings under a lubricated condition to investigate the effect of their surface hardness on wear, as well as the phase transformation...
In high temperature forming processes (forging, rolling, die-casting…) the tool surfaces are the privileged places for mechanical, thermal and physico-chemical solicitations. More precisely, friction and wear play an important part in tool surface damage. The tool steel grades exhibit damages such as local plastic deformation, plastic flow, carbides fragmentation and oxidation. Oxide scales, which...
The influence of surface micro topography of CVD α-Al 2 O 3 coatings, deposited on cemented carbide inserts, on tribological characteristics in sliding contact and in metal cutting has been investigated using quenched and tempered steel as counter/work material. Pin-on-disc and turning tests were carried out and post-test characterization using 3D optical surface profilometry and scanning...
The quality of innovating PDC (Polycrystalline Diamond Compact) bits materials needs to be determined with accuracy by measuring cutting efficiency and wear rate, both related to the overall mechanical properties. An original approach is developed to encompass cutting efficiency and wear contribution to the overall sample quality. Therefore, a lathe-type test device was used to abrade specific samples...
Diamond-like carbon (DLC) coatings are becoming potential candidates for automotive engine parts because of their excellent friction and wear resistance properties. It is important to understand their film-forming, friction reduction and wear resistance mechanisms. This paper studies the influence of hydrogen and tungsten concentration in DLCs on friction and wear by comparing the behaviour of one...
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