Experimental characterization and numerical modeling of short-glass-fiber composite for vibroacoustic applications
Résumé
In order to design vehicles with diminished CO2/km emissions level, car manufacturers-among alternatives-aim at reducing the weight of their vehicles. One of the solutions pursued consists in the replacement of metallic structural parts by light weight polymer based composites ones. Naturally, with these new parts, NHV (Noise, Vibration and Harshness) engineers now face the challenge to predict their vibrational responses. In the present study, focusing on PA6 reinforced glass fiber oil pan, mechanical and microstructural characterizations, dynamic mechanical analysis (DMA) and X-ray tomography measurements respectively were performed and evidenced that the complex modulus of the parent material not only depends on temperature and frequency but also on humidity content and loading direction. The effect of temperature and humidity content was also evidenced on the vibratory response of the oil pan. Further experimental (modal analysis) and numerical (finite element modeling) comparisons up to 2000 Hz were conducted, showing that simplistic material's descriptions are not satisfactory.
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