Enhanced constitutive models for forming or crashworthiness applications are regularly based on a number of history variables that define the state of damage and failure more or less accurate. These models require initialization with locally computed history properties prior to a crashworthiness simulator in order to predict the subsequent loading response correctly. It is therefore of great importance to not only evaluate the many available constitutive models, based on their performance achieved in crash loading scenarios but also take the production step with mapping of history data into account. This on the other hand drives the need for a continuously usable, i.e. applicable, model in both worlds: in sheet metal forming as well as in crashworthiness simulations. The present paper will focus on the recent developments in failure prediction in sheet metal and crashworthiness applications and on the methodologies to carry over corresponding history variables from one world to the other in order to strengthen the predictiveness of damage and failure in either application. A newly proposed approach called GISSMO is discussed and the advantages and disadvantages of the model in application, calibration and predictive performance in the light of the producibility-to-servicability simulation chain is shown.
A model to predict damage and failure for UHS in forming and crashworthiness applications
Ein Modell zur Schädigungs- und Versagensprognose ultrahochfesten Stahls für Umformsimulationen und Crash-Berechnungen
2011
5 Seiten, 7 Bilder, 11 Quellen
Conference paper
English
Aufprallenergieabsorptionsvermögen , Blechumformen , Dickenabhängigkeit , Fertigungssimulation , Grenzformänderungskurve , mechanische Spannungsverteilung , numerische Simulation , plastische Verformung , Rissausbreitung , Risseinleitung , Schadenkalkulation , Schadensanalyse , Spannungs-Dehnungs-Verhalten , Spannungszustand , Umformweg , Versagen , Vorhersagemodell
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