Pin-on-Disc

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The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Ulf Olofsson - One of the best experts on this subject based on the ideXlab platform.

Martin Hojer - One of the best experts on this subject based on the ideXlab platform.

Stefano Gialanella - One of the best experts on this subject based on the ideXlab platform.

  • Pin-on-Disc study of dry sliding behavior of Co-free HVOF-coated disc tested against different friction materials
    Friction, 2021
    Co-Authors: Matteo Federici, Giovanni Straffelini, Cinzia Menapace, Alessandro Mancini, Stefano Gialanella
    Abstract:

    The dry sliding behavior of three commercial friction materials (codenamed FM1, FM2, and FM3) tested against a Co-free cermet coating produced by high-velocity oxy-fuel (HVOF) on gray cast-iron discs is investigated. FM1 is a conventional low-metallic friction material, FM2 is developed for using against HVOF-coated discs, and FM3 is a Cu-free friction material with a low content of abrasives and a relatively high concentration of steel fibers. For the tribological evaluation, they are tested on a Pin-on-Disc (PoD) test rig against Co-free HVOF-coated discs, with particular attention to the running-in stage, which is fundamental for the establishment of a friction layer between the two mating surfaces, i.e., the pin and disc. The PoD tests are performed at room temperature (RT) and a high temperature (HT) of 300 °C. At RT, all materials exhibit a long running-in stage. At HT, no running-in is observed in FM1 and FM2, whereas a shorter running-in period, with respect to the RT case, is observed in FM3 followed by the attainment of a comparatively high coefficient of friction. At RT, the pin wear is mild in all cases but severe at HT. FM3 shows the lowest wear rate at both temperatures. Moreover, the coated disc shows no wear when sliding against the FM3 friction material. All the results are interpreted considering the microstructural characteristics of the friction layers formed on the sliding surfaces. The findings of the present study provide insights into reducing wear in braking system components and hence reducing environmental particulate matter emissions from their wear, through the use of disc coatings.

  • A Pin-on-Disc STUDY ON THE FRICTION, WEAR AND AIRBORNE PARTICLE EMISSION FROM RECYCLED BRAKE PAD MATERIAL
    2019
    Co-Authors: Yezhe Lyu, Jens Wahlström, Stefano Gialanella, Mara Leonardi, Ulf Olofsson
    Abstract:

    A Pin-on-Disc STUDY ON THE FRICTION, WEAR AND AIRBORNE PARTICLE EMISSION FROM RECYCLED BRAKE PAD MATERIAL

  • Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution
    Tribology Letters, 2017
    Co-Authors: Matteo Federici, Giovanni Straffelini, Stefano Gialanella
    Abstract:

    Pin-on-Disc (PoD) testing is widely used to investigate the sliding behaviour of materials and relevant wear mechanisms under different tribological conditions. The approach has been also profitably applied to the characterization of materials for brake systems to obtain specific information on the wear mechanisms. In the present study, the transient thermal analysis of a pin made with a friction material dry sliding against HVOF coated and uncoated pearlitic cast iron disc in a PoD apparatus was investigated by means of a finite element analysis together with experimental measurements. The aim of the investigation was to model the surface contact temperature in this sliding system to highlight the role of the different surface conditions, i.e., coated and uncoated, on the evolution of the pin and disc temperatures during sliding. In addition, we propose a simplified analytical equation for estimating the average temperature rise in the contact region during sliding, by extending the Kennedy approach in order to be able to provide a quick evaluation of the contact temperature for this kind of couplings, what is very helpful when characterizing a large number of systems in different contact conditions.

  • Wear and Contact Temperature Evolution in Pin-on-Disc Tribotesting of Low-Metallic Friction Material Sliding Against Pearlitic Cast Iron
    Tribology Letters, 2016
    Co-Authors: Giovanni Straffelini, Piyush Chandra Verma, Sergey Verlinski, Giorgio Valota, Stefano Gialanella
    Abstract:

    Pin-on-Disc tribotesting is widely used to investigate the sliding behaviour of materials, including friction materials used in braking systems. The evaluation of the average contact temperature is paramount to understand the acting friction and wear mechanisms, and to determine the role of the materials. In the present work, the tribological behaviour of a commercial low-metallic friction material during dry sliding against a pearlitic cast iron has been investigated and the evolution of pin and disc temperature was recorded. The temperature distributions in the pin and the disc were modelled using a finite element analysis with three different approaches, i.e. considering a perfect contact, the separated bodies concept, and the presence of a third body between the sliding surfaces. The results were then discussed by considering the damaging phenomena occurring at the sliding contact. Wear was found to be nearly mild in nature in agreement with the contact temperatures that were determined to be lower than 100 °C. During sliding, a limited third body was formed, made of a partially covering friction layer on the pin surface, and a thin and irregular oxide layer on the cast iron wear track. The approach based on the perfect contact with thermal continuity at the interface was found to better fit the experimental temperature records and to be in substantial agreement with the observed wear phenomena occurring at the pin–disc interface.

  • role of the friction layer in the high temperature pin on disc study of a brake material
    Wear, 2016
    Co-Authors: Piyush Chandra Verma, Andrea Onfanti, Giovanni Straffelini, Rodica Ciudi, Pranesh Aswath, Stefano Gialanella
    Abstract:

    Abstract The tribological behavior of a commercial brake pad material, wear tested under dry sliding conditions against a cast iron counterface disc with a Pin-on-Disc apparatus, was investigated. Wear tests were conducted at the following disc temperatures: 25 °C, 170 °C, 200 °C, 250 °C, 300 °C and 350 °C. Above 170 °C a transition from mild to severe wear was observed. At 25 °C and 170 °C, the friction layer on the pin surface consists of primary and compacted secondary plateaus. At 200 °C and above, a progressive reduction of the pin surface coverage by the secondary plateaus, that are barely present after the 350 °C test, is observed. Wear tracks on the discs derive from wear fragments due to the tribo-oxidation of the disc itself and from the wearing out of the pin material. The observed tribological behavior is very much influenced by the thermal degradation of the phenolic binder of the friction material, confirmed by thermogravimetric analyses, conducted on purpose on the pin material. Raman spectroscopy indicated the presence of carbonaceous products on the high temperature worn out pin surface. Although referring to rather extreme and simplified sliding conditions, the results obtained in this study provide useful indications on the role of the thermal stability of the organic component.

Jens Wahlström - One of the best experts on this subject based on the ideXlab platform.

Guido Perricone - One of the best experts on this subject based on the ideXlab platform.

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