Role of the friction layer in the high-temperature pin-on-disc study of a brake material

Verma, Piyush; Ciudin, Rodica; Bonfanti, Andrea; Aswath, Pranesh B.; Straffelini, Giovanni; Gialanella, Stefano

doi:10.1016/j.wear.2015.11.004

Cited by 144 publications

(101 citation statements)

References 29 publications

(38 reference statements)

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“…A run-in step of 10 min in the same experimental conditions was performed before the actual test. This run-in stage was used in previous studies and was sufficient to establish a conformal contact between the pin and the disc [5,6,37]. The selected testing parameters aimed at producing mild wear conditions [6,13,37].…”

Section: Pin-on-disc Testingmentioning

confidence: 99%

“…The approach is particularly suited to study the relationships existing among wear mechanisms and such parameters like contact pressure, sliding velocity, environmental conditions [1,2]. Several studies report on the PoD results, concerning investigations on materials for vehicular brake systems for different transportation fields, like road vehicles [3][4][5][6][7] and trains [8,9]. As automotive brakes are concerned, pads are made of friction materials, comprising a large number of organic and inorganic components, pressed against a rotating disc, typically made of pearlitic cast iron [10].…”

Section: Introductionmentioning

confidence: 99%

“…Of course, the compactness of the secondary plateaus increases with temperature. Therefore, an evaluation of the contact temperature is paramount to understand and to explain the main wear mechanisms [5,7,20]. In this regard, it has to be noticed that the local temperature at the friction plateaus, where sliding is really confined, is higher than the average surface contact temperature (or ''bulk'' temperature according to the nomenclature proposed by Ashby et al [23]).…”

Section: Introductionmentioning

confidence: 99%

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Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

2017

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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.

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Section: Pin-on-disc Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

2017

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“…Verma et al [13] studied friction and wear behaviour with a pin-on-disc tribometer and controlled the disc temperature from 25 to 300 °C with a heating coil. They used one nominal contact pressure and one sliding velocity.…”

Section: Introductionmentioning

confidence: 99%

Contact Pressure and Sliding Velocity Maps of the Friction, Wear and Emission from a Low-Metallic/Cast-Iron Disc Brake Contact Pair

et al. 2017

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“…whiskers). Anhydrous calcium sulfate whiskers (AH) can be used as reinforcers in friction materials because the whiskers do not fail at high work temperature (above 150 C) 9,11,12) . Wang et al 13) prepared HH whiskers by using ue-gas desulfurization (FGD) gypsum as raw materials in the H 2 O-H 2 SO 4 -NaCl system at 130 C for 60 min.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Anhydrous Calcium Sulfate Whiskers from Phosphogypsum in H2O-H2SO4 Autoclave-Free Hydrothermal System

et al. 2017

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The anhydrous calcium sulfate (AH) whiskers were prepared in H 2 O-H 2 SO 4 autoclave-free hydrothermal system by using phosphogypsum (PG) as raw materials. The in uences of solid/solution ratio, reaction time, H 2 SO 4 concentration and maleic acid on crystal growth were detected.The whiskers with smooth surface and high aspect ratio were obtained in a 20 mass% H 2 SO 4 solution for hydrothermal 1 h with 1:60 ratio of solid/solution. The aspect ratio decreased but the amount of whiskers increased in sample by increasing the addition amount of maleic acid.The whiskers were not obtained in 30 mass% H 2 SO 4 solution for hydrothermal 1, 2 and 3 h, respectively, with 1:60 ratio of solid/solution, and the whiskers were also not obtained by adding maleic acid in the solution.

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Role of the friction layer in the high-temperature pin-on-disc study of a brake material

Cited by 144 publications

References 29 publications

Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

Pin-on-Disc Testing of Low-Metallic Friction Material Sliding Against HVOF Coated Cast Iron: Modelling of the Contact Temperature Evolution

Contact Pressure and Sliding Velocity Maps of the Friction, Wear and Emission from a Low-Metallic/Cast-Iron Disc Brake Contact Pair

Preparation of Anhydrous Calcium Sulfate Whiskers from Phosphogypsum in H<sub>2</sub>O-H<sub>2</sub>SO<sub>4</sub> Autoclave-Free Hydrothermal System

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