Analysis of the error in the estimation of the morphology of contact plateaus existing on the surface of brake pads

Poletto, Jean Carlos; Barros, L.Y.; Neis, Patric Daniel; Ferreira, Ney Francisco

doi:10.1016/j.triboint.2018.05.026

Cited by 18 publications

(6 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The microscope images were analyzed by a code written in Matlab to estimate the ACP of the specimen, which represent the real contact area between the rotor and the BFM. [ 17 ] More details about this code, which is based in the Otsu algorithm, [ 25 ] are found in References 26–28.…”

Section: Methodsmentioning

confidence: 99%

An experimental study of the transition in the wear regime of brake friction materials

et al. 2021

View full text Add to dashboard Cite

Brake friction materials (BFMs) are designed to have low wear rate under different conditions of contact pressure, temperature, and sliding velocity. The conditions to ensure a low wear rate (i.e., a moderate wear regime) between the disc and the BFM are not well established. The present article aims to enhance the comprehension about the wear regimes for BFMs. For this purpose, a commercial BFM was slid against a gray cast iron rotor (disc). Tests were performed under different sliding velocities and with both increasing and decreasing steps of pressure levels. Tribofilm formed on the disc's surface and BFM's wear were monitored during the tests. It was possible to conclude that the previous condition of the surface of the disc, with respect to the presence or absence of tribofilm, affects the required conditions for the transition in the wear regime. The removal of tribofilm on the surface of the disc was affected by high contact pressures and high sliding velocities. Those conditions led to a severe wear regime with a destruction of contact plateaus and an increase in friction and BFM's wear.

show abstract

Section: Methodsmentioning

confidence: 99%

An experimental study of the transition in the wear regime of brake friction materials

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Near the edge of a pad's surface, the number of contact plateaus is frequently increased. 22 Image segmentation shows that non-organic asbestos brake pad has a large area of contact plateaus than low metallic brake pads, but their friction coefficient is slightly lower. 23 The large shear strains that occur while pad and disc velocity contact in a friction film or the outermost layer of the metallic composition leads to the higher secondary release of electrons throughout FIB-scanning, and hence the bright contrast of contact areas can be seen.…”

Section: Brake Pad Materialsmentioning

confidence: 99%

Progress in polymeric and metallic brake pads: A comprehensive review

Bilvatej,

Naveen,

Karthikeyan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

The use of asbestos in brake pads is being eliminated due to its carcinogenic effect. Due to this, there is a need for better alternative in the brake pad material to replace asbestos fibers. This leads to the development of more natural fibers/filler-based brake pads which are safer to the environment, cheaper, and readily available. Moreover, bio fillers-based brake pads have shown excellent performance compared to asbestos. This paper addresses the different composition of brake pad materials and manufacturing techniques. Common binders like epoxy resin, Phenolic resin-based brake pads were analyzed and its effect on the mechanical, tribological, and thermal performance were critically analyzed. Also, the performance of metal matrix-based brake pad has been analyzed in detail. It has been observed that utilizing natural fibers as a reinforcement provides an excellent braking performance compared to metallic and carbon fiber-based brake pads. This research will open new avenues towards “Net Zero.”

show abstract

“…9b) exhibits a large number of secondary plateaus, voids, and grooves. According to Poletto et al [40], secondary plateau formation is influenced by operating variables like contact pressure, sliding speed, sliding time, and temperature. These secondary plateaus can take part in the formation of a third body friction layer which plays an important role in the brake friction performance of the composites as reported in [41].…”

Section: Worn Surface Morphological Analysismentioning

confidence: 99%

Enhancement of tribological and thermo-mechanical properties of phenolic resin friction composites by improving interactions between elastomeric phase and matrix resin

2020

View full text Add to dashboard Cite

New elastomer-modified brake friction composites with the identical composition, but differing in the type of rubber, were developed by altering polar/non-polar elastomeric phases into the phenolic resin matrix. Effect of dispersion and interaction of the polar/non-polar rubbers with the matrix resin on dry sliding wear characteristics of the friction composites was investigated using a laboratory-scale pin-on-disc tribometer. The composites were prepared by hot mixing followed by compression molding and post-curing at a high temperature. Coefficient of friction (COF) and specific wear rate of the composites sliding against a cast-iron disc were measured and analyzed. Polar acrylonitrile-butadiene rubber (NBR, both powder, and bale rubber), and non-polar styrene-butadiene rubber (SBR) and ethylene-propylene-diene monomer (EPDM) were used with the phenolic resin where rubber islands and its polarity played the key role in delayed stress dissipation, while the hard matrix phase contributed to the intrinsic strength of the composites. This work describes how the distribution and interaction of polar and non-polar rubbers with the matrix resin influence the performance of brake friction composites. NBR (powder)-phenolic composite showed the highest stable average COF of 0.52 as compared to 0.36 for EPDM-based composite. NBR (powder)-based composite also exhibited ~1.5 times better specific wear rate (4.9 × 10 −3 mm 3 N −1 m −1) than EPDM-based composite (7.2 × 10 −3 mm 3 N −1 m −1). However, EPDM rubber-based composite showed a significant enhancement in thermal conductivity (0.43 W/m K). Morphological analyses revealed that the dispersion of rubber phase in phenolic matrix played a significant role in transforming the wear mechanism from abrasive to adhesive.

show abstract

Analysis of the error in the estimation of the morphology of contact plateaus existing on the surface of brake pads

Cited by 18 publications

References 25 publications

An experimental study of the transition in the wear regime of brake friction materials

An experimental study of the transition in the wear regime of brake friction materials

Progress in polymeric and metallic brake pads: A comprehensive review

Enhancement of tribological and thermo-mechanical properties of phenolic resin friction composites by improving interactions between elastomeric phase and matrix resin

Contact Info

Product

Resources

About