Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EVALUATION OF FRICTION MATERIAL USED IN BRAKE PADS AND LININGS THROUGH DMA TESTS
Submission Author:
Juliana Favero , RS
Co-Authors:
Juliana Favero, Roberta Motta Neves, Daniel Matté, Diego Antunes, Rogério Marczak
Presenter: Juliana Favero
doi://10.26678/ABCM.COBEM2023.COB2023-1983
Abstract
Breaks are among the most demanding devices regarding material strength. The results of material characterization tests for such applications are generally compared with the ones obtained through numerical simulations, in order to guarantee that the stresses generated in the friction materials during the brake application are not greater than the material strength, thus ensuring its usage without failure, as cracks or displacements. Braking efforts are repetitive and combined (traction, compression and shear), so this is an essential validation to ensure perfect field operation. DMA tests are widely explored by the viscoelastic materials industry, so the literature presents several studies using this technique on polymers, resins and rubbers. Friction materials may have some level of viscoelasticity, since they use organic resins and elastomers in their formulation, even if in small amounts. Organic resins are used as a binder, joining all other components, ensuring structural integrity. Elastomers, on the other hand, are the viscoelastic components responsible for giving flexibility to the friction material, rubbers are generally used. Thus, the main objective of the proposed work is to develop a methodology for the evaluation of friction materials using the DMA test. Tests trials will be carried out with different temperature and frequency settings, in addition to evaluating the influence of constant displacement or constant loading. In the future, the aim is to use these characterization results as input data for numerical simulations, using the adjustment of material elasticity modulus according to the temperature and frequency of loading (braking effort).
Keywords
Dynamic Mechanical Analysisfriction material, viscoelasticity, bench tests, characterization tests, Friction material
