Local thermal transfer improvement by using bimetallic architectured materials for braking application – numerical and experimental evaluations

Résumé fourni par la source

The thermal dissipation of a bimetallic material, based on Cu periodic foams filled with a classical sintered braking pad material, is studied in the present work. First, foam design (size, porosity, angle and cross-section) and finite element method (FEM) simulation were carried out to investigate the global and local thermal diffusivity of the bimetallic material s . The samples were prepared by a mixed process of investment casting and hot pressing. The global and local thermal dissipation of the bimetallic materials were measured by laser flash analysis (LFA) and a scale-reduced tribological test bench, respectively. Finally, a thermal enhancement mechanism of foam to the bimetallic materials is discussed. The heat dissipation behavior of the bimetallic materials can be predicted due to the architecture of the foams. It is shown by both simulation and experiments that the local thermal dissipation of the bimetallic materials can be improved with decrease in representative elementary volume (REV) size of foams. The maximum diffusion distance of heat from the filler material to the foam decreases with the decrease in REV size. As a result, the heat transfer efficiency at interface increases and then the Cu foam acts as a rapid pathway, transferring the heat from the interface to the bulk.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.