Regensburg 2007 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 22: SYM Physics meets Industry
MM 22.12: Talk
Wednesday, March 28, 2007, 18:55–19:15, H16
Modulation of stress-GBD curves of a polycristalline fibre mat using a micromechanic model — •Florian Wolferseder1, Ferdinand Haider2, and Uwe Tröger3 — 1Universität Augsburg, Institut für Physik — 2Universität Augsburg, Institut für Physik, Experimentalphysik I — 3Firma ArvinMeritor, Augsburg, Deutschland
Polycrystalline fibre mats are used to support ceramic substrates in catalytic converters and diesel particulate filters. Under compressive loading the fibre mats show a non-linear stress-strain behaviour. The stress-GBD (gap bulk density) curves follow a power-law relationship in accordance with several models. The models predict an exponent of the power law higher 3, depending on the architecture of the fibre network. In-situ-deformation in a SEM on the fibre mat were conducted in order to verify the assumptions of the model and the results of the compression tests. Another aim has been to find an empirical formula of the stress-time behaviour for long time relaxation experiments.