Influence of various metallic fillers in friction materials on hot-spot appearance during stop braking

Kumar, Mukesh; Boidin, Xavier; Desplanques, Yannick; Bijwe, Jayashree

doi:10.1016/j.wear.2010.11.009

Cited by 45 publications

(34 citation statements)

References 22 publications

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“…It should be pointed out that the phenomenon of hot spots is widely considered by many researchers who deal with the both brake systems and the friction clutches of the means of transport [1,2,5,8,16]. Number of papers presents the results of studies that allow to identify the phenomenon in respect of the location and number of hot spots on the brake disc [5,6]. Part of the articles present the simulation results conducted at the ANSYS environment also paying attention to the phenomenon of hot spots as the papers [3,4,7,14,15].…”

Section: Fig 2 the Temperature Distribution On The Brake Disc Coopementioning

confidence: 99%

Identification of the hot spots phenomenon in brakes by using a thermal imaging camera

Sawczuk¹

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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A long operation of the brake pads of the brake disc causes uneven wear of the friction surface. This applies both to the friction pads of organic material and from sintered metal. For larger braking power is the reason for overheating the blade, resulting in varying temperature distribution on the brake disc cooperating with the friction pad. The first study of this phenomenon has shown that it is highly speed-dependent braking. Therefore, it was observed during the train's braking from a speed of 300 km/h. At these speeds the brake disc there are known. Hot spots between which are areas with a substantially lower temperature. However, in areas of high temperatures it occurs following the formation of the protrusions due to the expansion of the target material. This phenomenon is further enhanced during each rotation of the disc, while on each bulge of material stresses acting on each surface of the friction pad. Occurring grooves on the facing (the space between the surfaces of friction) have proved insufficient to absorb the heat produced during braking. They take a small part of the thermal energy, which on the face have areas with different temperatures, 100 °C at the periphery of the disc 800 and 900 °C protrusions. This phenomenon is very complicated because it involves in addition to the properties of the material for brake discs presented and described dependency of the breaking function of temperature. Thus, many manufacturers brake disc determines the maximum mean temperature of the disc at 400 °C in cooperation with the organic friction pad and 550 °C in cooperation with the pad of sintered metal. Type of braking understood speed beginning of braking pressure to the brake disc pads and the mass of the slowdown and the strength properties of the target material impact on the number of hot spots on the disc, ie. The distance between hot spots. In order to eliminate the phenomenon, the manufacturers of friction pads modify the shape of the contact surface pads of brake discs to ensure even distribution of pressure on the dial. However, during the long service there is a phenomenon of laying a liner with respect to the brake disc, the reasons for the backlash in the mechanism of the brake lever which, due to wear of the brake disc itself. Then, in some cases, a phenomenon arises hotspots. Cladding without causing the phenomenon is facing divided into several friction elements hinged. This solution will ensure even distribution of the pressure of all the friction elements on the shield throughout the life of the pad. As a result, the brake disc does not tend to create "hot" areas that are the reason the formation of bulges in the material of the disc.The article presents the possibility of using the thermal imaging camera studies disc brakes in order to identify the phenomenon of hot spots. The results allow to evaluate the temperature distribution on the brake disc in which there is a tendency to create hot spots.

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Section: Fig 2 the Temperature Distribution On The Brake Disc Coopementioning

confidence: 99%

Identification of the hot spots phenomenon in brakes by using a thermal imaging camera

Sawczuk¹

2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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“…However, the variation of the luminance provides relevant information about thermal phenomena of load-bearing localizations affecting rubbed surfaces. Indeed, braking generates severe thermo-mechanical distortions induced by thermal gradients that deform the bodies in contact, leading to the formation of hot bands and hot spots in the most extreme cases and giving rise to surface temperatures that can locally reach 1000 1C [21][22][23]. Then, the measurements are given in digital degrees which correspond to the intensity of the surface infrared radiation (Fig.…”

Section: Stop Brakingmentioning

confidence: 99%

Impact of the glass fibers addition on tribological behavior and braking performances of organic matrix composites for brake lining

Baklouti¹,

Cristol²,

Desplanques³

et al. 2015

Wear

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“…• Influence of varying amount, size, shape, and type of metallic contents such as copper, brass, and steel in the form of short fibers and powders (micron and nanometer size) [29][30][31][32].…”

Section: Some Highlights Of Research Investigationsmentioning

confidence: 99%

Multifunctionality of nonasbestos organic brake materials

Bijwe¹

2015

Multifunctionality of Polymer Composites

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Influence of various metallic fillers in friction materials on hot-spot appearance during stop braking

Cited by 45 publications

References 22 publications

Identification of the hot spots phenomenon in brakes by using a thermal imaging camera

Identification of the hot spots phenomenon in brakes by using a thermal imaging camera

Impact of the glass fibers addition on tribological behavior and braking performances of organic matrix composites for brake lining

Multifunctionality of nonasbestos organic brake materials

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