A New Laboratory Friction and Wear Test for the Characterization of Brake Linings

Anderson, A. E.; Gratch, Serge; Hayes, H.

doi:10.4271/670079

Cited by 23 publications

(9 citation statements)

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“…Dynamometer tests are accelerated bench tests, carried out on real parts, reproducing the real braking conditions. On the contrary, small-scale testing rigs, such as the friction assessment screening test (FAST) [9], the Chase machine [10], the reduce-scale dynamometers [11,12] or the Pin on Disc (PoD) tests, are simply used as first screening tests or in the initial stage of the development of new friction materials [11]. In particular, PoD tests, are rather simplified tests since they are typically carried out in drag conditions, i.e., under constant sliding velocity and contact pressure.…”

Section: Introductionmentioning

confidence: 99%

A critical comparison of dynamometer data with pin-on-disc data for the same two friction material pairs – A case study

Federici

Alemani

Menapace

et al. 2019

Wear

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Friction and wear behavior of brake materials is often investigated using Pin-on-Disc (PoD) or dynamometer tests. Dynamometer tests reproduce the real braking conditions since they are carried out on real parts. whereas PoD tests are carried out using small pins, under constant sliding velocity and contact pressure. In the present technical note, the friction and wear behavior of two commercial friction materials, a low-met and a nonasbestos organic (NAO) material, dry sliding against a pearlitic cast iron counterface disc was investigated. The PoD tests were carried out at room temperature and at 300°C; the dynamometer tests were conducted simulating urban braking conditions. The experimental data were compared and the main wear mechanisms were identified. The wear mechanisms observed with the PoD at room temperature turned out to be similar to those observed with the dynamometer tests. On the other hand, the PoD tests carried out at 300°C revealed particular features in the friction layer that were not detected in the dynamometric tests. As far as the tribological data are concerned, the average friction coefficients recorded during the dynamometric tests were similar to the values recorded in the PoD tests, whereas the wear coefficients were one order of magnitude lower, most probably due to the limited area of contact of the pins.

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Section: Introductionmentioning

confidence: 99%

A critical comparison of dynamometer data with pin-on-disc data for the same two friction material pairs – A case study

Federici

Alemani

Menapace

et al. 2019

Wear

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“…A reduced scale testing system has been used in the past for different applications, such as screening for friction stability using the FAST machine and monitoring drum lining material using the CHASE machine [8,9]. reducing spurious effects such as caliper and bracket deflection and pressure fluctuations [6].…”

Section: Introductionmentioning

confidence: 99%

Reduced scale thermal characterization of automotive disc brake

Alnaqi

Barton

Brooks

2015

Applied Thermal Engineering

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The thermal behaviour of a disc brake is a critical factor that needs to be considered at the design phase. Most researchers utilise a full size brake dynamometer or a simple pin-on-disc rig to experimentally evaluate the performance of a friction pair (disc and pad). In the current paper, a scaling methodology is proposed to evaluate the thermal performance of a disc brake at a reduced scale. The resulting small scale disc brake has the advantage of low cost and reduced development time. The proposed scaling methodology was validated by comparing the results for the full and small scale discs using a conventional brake dynamometer. In addition, a two dimensional axisymmetric transient thermal finite element model was developed using Abaqus software to assist in the validation of the scaling methodology. The numerical simulations confirmed the equivalence between the full and small scale disc thermal performance using the proposed scaling methodology and also gave good agreement with the experimental results. It is concluded that the scaling methodology is an important tool with which to evaluate the thermal performance of disc brakes in the early design phase.Keywords: Disc brake, thermal performance, dynamometer, small scale.The ratio of heat flux into the pad to the total heat flux M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT

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“…18 A small specimen (13.5 mm × 12.7 mm × 4.7 mm) suspended from a hinged arm is pulled onto the surface of the disc with a normal force of appropriate magnitude. The testing system is controlled by a hydraulic feedback system that continuously changes the normal force to maintain a constant friction force of 17.4 N 19. The mean temperature measured at some point on the rubbing track increases with time at a rate that is independent of the composition of the friction material.…”

Section: Methodsmentioning

confidence: 99%

Optimization of a commercial brake pad formulation

Tang

Wright

2002

J of Applied Polymer Sci

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A brake pad material used in a popular, commercially available vehicle that consisted of steel wool, iron powder, graphite, coke, styrene-butadiene rubber, MgO, BaSO 4 , and phenolic resin was tested with the friction assessment and screening test. The average friction coefficient (0.357) and total wear (19.75 wt %) were measured. An alternative friction material formulated with identical constituents but optimized with the golden section principle and relational grade analysis was produced in a laboratory environment. This material exhibited an average friction coefficient of 0.419 and a low total wear of 6.25 wt %. An analysis of component costs indicated that the large volume price of the commercial material, $1.01/kg, was less than that of the laboratory material, $1.21/kg. However, the performance/cost ratio of the new material was appreciably greater.

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A New Laboratory Friction and Wear Test for the Characterization of Brake Linings

Cited by 23 publications

References 1 publication

A critical comparison of dynamometer data with pin-on-disc data for the same two friction material pairs – A case study

A critical comparison of dynamometer data with pin-on-disc data for the same two friction material pairs – A case study

Reduced scale thermal characterization of automotive disc brake

Optimization of a commercial brake pad formulation

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