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Ms. Ana Paula Gomes Nogueira, University of Trento, ITALY

Mr. Stefano Candeo, University of Trento, ITALY

Dr. Eng. Mara Leonardi, Brembo, ITALY

Prof. Dr. Giovanni Straffelini, University of Trento, ITALY

Tribological transitions are frequent when two new surfaces are placed in contact under load and sliding conditions. These transitions usually occur not only by the changes on the surface roughness, but also by the characteristics of the third body formed between the mating surfaces. The present work investigates the tribological behavior and the related airborne particles emissions of a Cu-free brake friction material during the initial stage of braking (bedding), starting from a virgin material. The tribo-tests have been conducted using a reduced-scale dynamometer, and the number distribution of the airborne particles was simultaneously measured by an Optical Particle Sizer (OPS). The tests were stopped with 25, 50, 100 and 130 brake events in order to analyze the surface of the friction material. Bedding showed two distinct stages regarding the friction and emissions behaviors. The first is characterized by a pronounced increase in both friction coefficient and particles emissions, achieving the highest value around 35 brake events. Successively, a smooth decrease is observed until reach the steady-stage of the friction coefficient. The friction layer formed on the surface of friction material seems to be correlated with the tribological and emissions results; in which the achievement of the state-state on the friction coefficient is coincident with the progressive compaction and area-increase of the secondary plateaus.

EuroBrake 2021





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Stefano’s Ph.D. project deals with the study of the brake performance and emissions of commercial and innovative automotive brake materials. He focuses on testing methodologies for an effective mapping of the brake performance and emission behaviors and on general relationships between the tribological parameters and the characteristics of the worn surfaces and PM.

He graduated at the University of Padova, Italy, in Mechanical Engineering with a thesis in Metal Additive Manufacturing.

In his current Ph.D. at the University of Trento, Italy, he is supervised by Giovanni Straffelini and Stefano Gialanella, in collaboration with Brembo S.p.A.


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Mr. Stefano Candeo

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