Friction and wear of brake systems

Ostermeyer, Georg‐Peter

doi:10.1007/s100100100063

Cited by 77 publications

(39 citation statements)

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“…Eriksson et al [7] presented an explanatory model of the complex contact situation between an organic brake pad and a cast iron disc, (Ö sterle et al [8], and Ostermeyer [9] presented similar results). In this model, metal fibres (or other hard materials) in the pad material form stable primary plateaus (or patches), which carry the main part of the load.…”

Section: Introductionsupporting

confidence: 54%

A Cellular Automaton Approach to Numerically Simulate the Contact Situation in Disc Brakes

2011

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Since brake wear is an important contributor to the concentration of airborne particles in urban atmospheres, it is important to increase our understanding of the origin of these particles. The contact situation between the pad and disc is complicated. Metal fibres in the pad (or other hard materials) form stable contact plateaus, which carry the main part of the load. A flow of wear particles in the boundary layer between the pad and disc partially stack up against these plateaus (and increase their area), and some will escape from the contact and become airborne. The purpose of this article is to investigate the possibility to numerically simulate the contact situation in the boundary layer between the pad and disc and the amount of wear that leaves the contact using a cellular automaton approach. To do so, the contact pressure, pad temperature and wear are determined in that order. Based on these results, the creation, growth and destruction of contact plateaus are simulated using a cellular automaton model. Finally, the amount of wear that leaves the contact is determined. The simulated behaviour of the contact situation correlates qualitatively with experimental observations found in the literature.

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Section: Introductionsupporting

confidence: 54%

A Cellular Automaton Approach to Numerically Simulate the Contact Situation in Disc Brakes

2011

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“…This combined effect of pressure and speed causes the temperature rise at the interface, which decreases the heat resistance components in the formulation. This temperature rise causes the destruction and reformation of the tribo layer, which is responsible for maintaining the stable coefficient of friction [1]. Hence, as observed from | https://mc03.manuscriptcentral.com/friction industrial norms.…”

Section: Discussion Of Friction Behavior Of Brake Linermentioning

confidence: 92%

“…Whenever the brake is applied, wear particles flow along the direction of rotation of the drum and also partially out of the drum. The flow of wear particles depends on the increase in temperature [1] at the drum and liner interface. The temperature increase depends on numerous parameters such as deceleration, speed,…”

Section: Introductionmentioning

confidence: 99%

Correlation of field and experimental test data of wear in heavy commercial vehicle brake liners

Rajan

Balaji

Velmurugan³

2017

Friction

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Abstract:The correlation between the wear behavior of a heavy commercial vehicle (HCV) brake liner tested under controlled laboratory conditions and that in actual field conditions is investigated. A brake liner study for friction and wear is performed on an inertia brake dynamometer (IBD) at different temperatures (200 °C , 250 °C , and 300 °C ) using 6000 brake actuations in a laboratory. The total wear loss of the brake liner at three different temperatures for 6000 brake actuations in IBD is found to be 1.12 mm. The actual field test is conducted on four different HCVs, namely, a city bus (CB), a high speed bus (HSB), a highway truck (HWT), and a tipper lorry (TL). These HCVs run at different terrain/traffic conditions and load conditions. When comparing the predicted life of the brake liner through the IBD test with the actual life of the brake liner in different HCVs, a vast difference is observed. Due to the large variation of liner life observed between the actual and predicted tests, an extensive field test is conducted. In the field test, the liner with identical formulation is fitted in the four types of HCVs. The predicted life of the liner using IBD is then correlated with the field test observation and a correlation factor is determined. Based on this correlation factor, the predicted life of the liner and the achieved life on the HCV are found to be fairly close. This study will be useful to design the friction material formulation and to predict the actual life of the brake liner for various HCVs.

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“…OSTERMEYER (2001) [15] ressalta que pastilhas de freio geralmente são constituídas por mais de 20 ingredientes. Segundo OSTERMEYER e MULLER (2008) [16], pastilhas e lonas de freios devem apresentar baixo desgaste do material de atrito, manter o atrito estável à medida que há variação de temperatura, liberação mínima de resíduos e minimização da geração de ruído e vibrações.…”

Section: Introductionunclassified

Aplicação de Técnicas de Planejamento de Experimentos para Otimização do Comportamento Tribológico e Térmico de Materiais de Atrito Durante o Processo de Frenagem

et al. 2018

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RESUMOSistemas de freio têm a finalidade de reduzir ou manter a velocidade de um veículo, levá-lo à imobilidade ou mantê-lo imóvel. O princípio básico dos sistemas de freios por atrito é a conversão da energia cinética do veículo em energia térmica. Neste estudo, buscou-se analisar os parâmetros de operação de um sistema de freio a disco para motocicletas utilizando-se um banco de ensaios baseado no procedimento Krauss, descrita pela norma ABNT NBR 6143/1995. Optou-se por conduzir um Experimento fatorial completo 2³, em que os três fatores de controle considerados (tipo de disco de freio, tipo de pastilha e o valor da pressão de acionamento da manete de freio) foram alterados deliberadamente em dois níveis cada. Analisou-se as propriedades dos materiais envolvidos novos e após um determinado tempo de uso, denominado materiais assentados. Para avaliar o desempenho do sistema de freio durante o processo de frenagem, analisaram-se duas variáveis de resposta simultaneamente: coeficiente de atrito e temperatura final. A partir dos experimentos, o desempenho tribológico mais satisfatório ocorreu para os materiais constituintes do par de atrito, disco e pastilhas, assentados, e um menor valor de pressão de acionamento da manete de freio. Já para a temperatura, o melhor resultado ocorreu para os materiais do par de atrito novo e um menor valor de pressão. Com o intuito de encontrar a melhor combinação dos níveis de cada fator que otimize o desempenho global destas duas variáveis resposta, foi proposta uma técnica de otimização de múltiplas respostas. Como resultado, obteve-se os níveis assentados do par de atrito e o menor valor de pressão como os capazes de otimizar as duas variáveis resposta simultaneamente. Por fim, o banco de ensaios foi adaptado com um motor de maior potência, o que possibilitou evidenciar e esclarecer mais sobre o efeito brake fade. Palavras-chave: Material de atrito, Frenagem, Sistemas de Freio, efeito fade ABSTRACTBrake systems are employed to reduce or maintain the speed of a vehicle, take it to stillness or keep it motionless. The basic principle of friction brake systems is the conversion of the kinetic energy of the vehicle into thermal energy. This study aimed to analyze the operating parameters of a disc brake system for motorcycles using a test bench based on the Krauss procedure described by ABNT NBR 6143/1995. It was decided to conduct a complete 2³ factorial experiment, in which the three control factors considered (type of brake disc, type of pad and the value of brake lever drive pressure) were deliberately altered in two levels each. The properties of the new materials were analyzed and after a certain time of use, called seated materials. To evaluate the performance of the brake system during the braking process, two response variables were analyzed simultaneously: friction coefficient and final temperature. From the experiments, the

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Friction and wear of brake systems

Cited by 77 publications

References 0 publications

A Cellular Automaton Approach to Numerically Simulate the Contact Situation in Disc Brakes

A Cellular Automaton Approach to Numerically Simulate the Contact Situation in Disc Brakes

Correlation of field and experimental test data of wear in heavy commercial vehicle brake liners

Aplicação de Técnicas de Planejamento de Experimentos para Otimização do Comportamento Tribológico e Térmico de Materiais de Atrito Durante o Processo de Frenagem

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