Brake pad formulations usually contain more than 20 components. Even if each filler effect on the final product properties are acknowledged, interaction developed between filler and matrix, as well as interaction between fillers remain unknown. For a brake pad, friction coefficient and wear can be considered as the resulting performances of all the braking process and the testing conditions. To better understand them, it is necessary to take in account thermal, morphological and physical-mechanical properties of all the friction material ingredients and their eventual mutual interaction. This point is usually left aside in literature, which represents an obvious gap towards the full mechanism comprehension. This work is devoted to the understanding of the interactions among all the ingredients, focusing on the relationship between the main thermal/mechanical properties and the tribological behavior of the composite. First of all, a simplified formulation is set up, including a limited number of components. The experimental work starts with the creation of binary systems containing only the binder and a filler, then the system gets more complex with addition of other fillers until reaching the total formulation. A systematic characterization of the material properties is performed, and analyzed using principal components analysis (PCA) method, which is a powerful dimension-reduction tool permitting to obtain from a large set of variables a graphic representation, called biplot, of the entire set of objects and variables to identify objects (samples) similarities and variables (measured properties) correlations. It is obviously only a model proposal, giving indications in order to improve the system and tailor the desired material properties modifying ingredients nature or content. The method developed here and its further data treatment using PCA can be extended to a wider investigation formulating more samples, or a deeper investigation considering more properties.

Synergetic effects inside a simplified friction material: study of the role of ingredients / Vivier, Florence; Sangermano, Marco; Pellerej, Diego. - (2016). [10.6092/polito/porto/2660107]

Synergetic effects inside a simplified friction material: study of the role of ingredients

SANGERMANO, MARCO;
2016

Abstract

Brake pad formulations usually contain more than 20 components. Even if each filler effect on the final product properties are acknowledged, interaction developed between filler and matrix, as well as interaction between fillers remain unknown. For a brake pad, friction coefficient and wear can be considered as the resulting performances of all the braking process and the testing conditions. To better understand them, it is necessary to take in account thermal, morphological and physical-mechanical properties of all the friction material ingredients and their eventual mutual interaction. This point is usually left aside in literature, which represents an obvious gap towards the full mechanism comprehension. This work is devoted to the understanding of the interactions among all the ingredients, focusing on the relationship between the main thermal/mechanical properties and the tribological behavior of the composite. First of all, a simplified formulation is set up, including a limited number of components. The experimental work starts with the creation of binary systems containing only the binder and a filler, then the system gets more complex with addition of other fillers until reaching the total formulation. A systematic characterization of the material properties is performed, and analyzed using principal components analysis (PCA) method, which is a powerful dimension-reduction tool permitting to obtain from a large set of variables a graphic representation, called biplot, of the entire set of objects and variables to identify objects (samples) similarities and variables (measured properties) correlations. It is obviously only a model proposal, giving indications in order to improve the system and tailor the desired material properties modifying ingredients nature or content. The method developed here and its further data treatment using PCA can be extended to a wider investigation formulating more samples, or a deeper investigation considering more properties.
2016
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2660107
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