Influence of modified phenolic resins on the fade and recovery behavior of friction materials

Bijwe, Jayashree; Nidhi, -; Majumdar, N.; Satapathy, Bhabani K.

doi:10.1016/j.wear.2005.01.011

Cited by 169 publications

(87 citation statements)

References 9 publications

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“…The friction materials ST and BP showed typical worn surfaces after the high-temperature wear tests, showing compacted plateaus and partially detached areas. This suggests that the wear processes of the friction materials ST and BP are governed mainly by the thermal decomposition of the binder resin, as reported in other articles [13,14,17]. However, the area of the contact plateaus was much bigger in the specimen BP than ST, while a larger area on the rubbing surface was detached in the specimen ST due to thermal decomposition.…”

Section: Wear Resistancesupporting

confidence: 69%

“…They found that the heat resistance was improved by using the resin modified by aralkylether, while a contrary result was obtained in terms of wear resistance. Bijwe and coworkers [14][15][16] reported the effect of modified resins on the fade and recovery of friction materials. They compared five modified resins concerning the friction and wear at high temperatures and concluded that no resin satisfied all the performance-related parameters.…”

Section: Introductionmentioning

confidence: 99%

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Tribological Characteristics of Binder Resins for Brake Friction Materials at Elevated Temperatures

et al. 2010

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The heat resistance of the multiphase friction materials made with straight phenolic resin (ST), boronphosphorous (B-P)-modified phenolic resin (BP), or polyimide (PI) was investigated using a Krauss-type friction tester. Thermal analysis of the cured resins was also carried out to examine the chemical and mechanical properties of the resin and their effects on the wear rate and the coefficient of friction. The results showed that the fade and wear of the friction materials were closely related to the thermal decomposition of the binder resin and durability of the contact plateaus, which were produced by the compaction of wear debris around hard ingredients on the rubbing surface. The friction material containing the B-P modified resin was more resistant to wear and fade than the other binder resins. On the other hand, the friction material with polyimide showed good fade resistance but exhibited excessive wear despite its good thermal resistance.

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Section: Wear Resistancesupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Tribological Characteristics of Binder Resins for Brake Friction Materials at Elevated Temperatures

et al. 2010

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“…Satapathy ve arkadaşları [17], etkinlik kayıplarını; 'yüke bağlı etkinlik kaybı', 'hıza bağlı etkinlik kaybı' ve 'sıcaklığa bağlı etkinlik kaybı' olarak sınıflandırıp, sıcaklığa bağlı etkinlik kaybının diskli frenlerde 370ºC'den itibaren önemli ölçüde kendini göstereceğini ifade etmişlerdir. Bijwe ve arkadaşları [18], 300-400ºC arasındaki sıcaklık değerlerine yükselen fren disklerinin etkinlik kaybına neden olabileceğini vurgulamışlardır. Aleksendric ve Duboka [19] ise 400ºC civarındaki sıcaklıkların eşik değer olduğunu, disk sıcaklıklarının 600ºC'yi aşması halinde fren diski ile balata arasındaki sürtünme katsayısının büyük ölçüde azalması nedeniyle fren etkinliğinin tamamen kaybolacağını savunmuştur.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Fren Di̇sk Sicakliğinin Frenleme Performansina Etki̇si̇

Erdem¹,

Altıparmak²

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu deneysel çalışmada, fren disk sıcaklıklarındaki artışın taşıtın frenleme performansına etkileri araştırılmıştır. Bu amaçla, frenleme performansının en önemli göstergesi olan durma mesafesi testleri yapılmıştır. Testler, bir hafif ticari taşıtta, değişik disk sıcaklıkları, pedal kuvvetleri, taşıt yükleri ve başlangıç hızlarında gerçekleştirilmiştir. Yapılan fren etkinliği test sonuçları, fren disklerindeki sıcaklık artışının taşıtın frenleme mesafesini olumsuz etkilediğini göstermiştir. Farklı pedal kuvvetleri, frenleme başlangıç hızları ve taşıt yükü değişimlerine göre değerlendirilen sonuçlardan, disk sıcaklığındaki artışın frenleme mesafesini artırdığı gözlenmiştir. Tipik bir yol testi sonucu olarak; 80 km/h hızla ve maksimum pedal kuvvetiyle 63ºC fren disk sıcaklığında taşıt 44,9 m'de dururken, 298 ºC disk sıcaklığında durma mesafesi %17,4 oranında artarak 52,71 m olarak ölçülmüştür.Anahtar kelimeler: Frenleme performansı, yol deneyi, durma mesafesi, disk sıcaklığı, hafif ticari taşıt THE EFFECT OF BRAKE DISC TEMPERATURE ON BRAKING PERFORMANCE ABSTRACTIn this experimental work, effect of increasing in brake disc temperature on braking performance was investigated. For this purpose, braking distance tests which the criteria of braking performance were carried out. The tests were conducted on a small-size commercial vehicle for different disc temperatures, pedal forces, the vehicle loads and for initial vehicle speeds. Test results of stopping (braking) distance were analyzed for the variation of disc temperatures. The results showed that the stopping distance is considerable increased when the disc temperature is increased for different vehicle speed and pedal forces. Typically, at the vehicle speed of 80 km/h and maximum pedal force for 63 ºC disc temperature, 44.9 m stopping distance was measured. When the temperature is increased as 298 ºC, stopping distance is increased as 52.71 m with the rate of 17.4% at road test.

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“…The resulting temperature distribution at the friction interface can be quite complex, and directly affects braking performance. It has been investigated by several researchers over many years [1][2][3][4][5][6], who have shown how high temperatures can cause a fall in friction coefficient, or fade, and increased wear of both discs and pads. Both fade and increased wear are affected by local thermal distortions of the disc, which can lead to hot spots [7].…”

Section: Introductionmentioning

confidence: 99%

Air jet cooling of brake discs

Lyons

Murray

Torrance

2008

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper reports on an investigation of a novel approach to the cooling of brake discs, based on the application of impinging air jets. This has the capacity to enhance the heat transfer coefficients at the disc surface quite considerably without affecting the disc design, so that the disc construction may then be optimized without reference to heat transfer. Using a purpose built test-rig, disc temperature histories were recorded using IR thermography for varying jet air flow rates, angle of impingement, dimensionless distance from the brake disc and rotational speed. As well as comparing cooling effectiveness for different test parameters, convective heat transfer coefficients were calculated from the transient temperature data and were used as boundary conditions for a finite element model of the process. The results obtained from this investigation suggest that the higher convection coefficients achieved with jet cooling will not only reduce the maximum temperature in the braking cycle but will reduce thermal gradients, since heat will be removed faster from hotter parts of the disc. Jet cooling should therefore be effective to reduce the risk of hot spot formation and associated disc distortion.

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Influence of modified phenolic resins on the fade and recovery behavior of friction materials

Cited by 169 publications

References 9 publications

Tribological Characteristics of Binder Resins for Brake Friction Materials at Elevated Temperatures

Tribological Characteristics of Binder Resins for Brake Friction Materials at Elevated Temperatures

Fren Di̇sk Sicakliğinin Frenleme Performansina Etki̇si̇

Air jet cooling of brake discs

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