The present contribution will focus on one of the most urging challenges in sheet metal forming and crashworthiness simulation for hight strength steels, namely alternative or enhanced constitutive formulations to predict failure and cracking of sheet metal. Furthermore the inclusion of forming results in crashworthiness finite element models in order to predict material failure in such numerical investigations is of major concern. In a broader view this simulation process chain may be termed as producibility-to-serviceability since the driving force behind forming simulations used to be the question if a certain part may be produced on certain press equipment with a defined number of forming stages from a specific material of given initial thickness. Carrying over the forming results to other simulation disciplines, like crashworthiness or NVH, where the serviceability of the designed structure is investigated further, will eventually give more inside into the effects of prestraining and possible pre-damage emerging from production processes on the target discipline. The topic is extremely demanding since nowadays the crashworthiness of bodies in white is assessed to a major extent by finitie element simulations without taking the production history into account. In this context, high strength steel qualities are known to be more problematic. The present contribution discusses engineering driven approaches to close the constitutive gap between the forming and crashworthiness world.
Predicting damage and failure in forming and crashworthiness simulations
2010
13 Seiten, 7 Bilder, 11 Quellen
Conference paper
English
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