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Lebensdauerberechnung von Abgaskomponenten auf der Basis von Riss-wachstumsmodellen für thermomechanische Ermüdung

: Riedel, H.; Mohrmann, R.; Schmitt, W.; Hauss, R.

Deutscher Verband für Materialforschung und -prüfung e.V. -DVM-, Arbeitskreis Bruchvorgänge -AKBV-:
Ermüdungsrisswachstum. Weiterbildungsseminar DVM-Arbeitskreis Bruchvorgänge : Freiburg, 17. Februar 2003
Freiburg/Brsg., 2003
Weiterbildungsseminar Ermüdungsrisswachstum <2003, Freiburg/Brsg.>
Conference Paper
Fraunhofer IWM ()
exhaust system; thermal-mechanical loading; viscoplastic; constitutive model; microcrack

Modern exhaust systems must withstand severe cyclic mechanical and thermal loads throughout the whole life cycle. Up to now, highly loaded parts of exhaust syst ems are predominantly designed experimentally by means of lengthy and expensive component tests. A further shortening of development time without quality loss i s possible only by an increasing application of computer simulation. A procedure is presented which supports the component development already in an early desig n stage and which aims at reducing the number of component tests. The numerical model is capable of handling complex thermal-mechanical loading histories by a v iscoplastic constitutive model.