A study regarding damping properties of alternative materials for rail-to-ground fastening components is carried out to overcome the noise and vibration problem of railway track by means of alternative solutions exploiting material internal friction. The damping properties of sintered steel having cellular microstructure and of a composite material obtained by sintered steel infiltration with a polymeric resin were investigated. The effects of the infiltration on steel static properties were preliminarily analyzed by compression tests, whose results show that the treatment increases elastic stiffness and flow stresses. The influence of load magnitude and fatigue damage on materials damping was instead analyzed executing periodically interrupted fatigue tests and processing experimental data by a new procedure. Damping results show that, when cyclic stresses belong to the elastic field, the infiltration treatment increases the amplitude decay rate. For more severe stress amplitudes, the infiltrating resin, bounding plastic strains of metallic matrix, restrains the corresponding dislocation-related damping mechanisms. The fatigue damage due to cyclic compressive stresses is responsible of damping decay in the examined materials; a more stable behaviour has been observed for the composite when it was loaded in the elastic range, whereas infiltrating resin strains were responsible of the dominant damping mechanism.
Internal damping characterization of sintered advanced materials
2005
7 Seiten, 8 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
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