In the trend of lightweight construction more and more high strength steels come to application in automotive structural components. Since the ductility of high strength steels is relatively low, damage behavior of these materials has to be modeled in vehicle crash simulations to achieve a reliable crash worthiness prediction. The local mechanical properties e.g. flow stress and fracture strain in an automotive component manufactured by deep drawing are inhomogeneous due to different local deformation degrees which affects the component behavior under crash loading considerably. A reasonable approach for modeling the damage behavior of a component produced by deep drawing is a coupling between forming simulation and crash simulation. However, many questions are still open for this approach, e.g. which material model (kinematic or isotropic hardening) and which damage model should be used for an integrated simulation. In this work the influences of pre-strain and pre-damage caused by deep drawing on the crash behavior of an automobile component from a TRIP steel were investigated. To study the dependence of damage on loading history, metal sheets were at first loaded under biaxial tension to different loading levels, then small tension and shear specimens were cut from the deformed sheets and loaded to final rupture. In this way the influences of loading history and triaxiality on damage behavior were quantified. A general material model which describes kinematic hardening, anisotropy and damage was developed and implemented for forming and crash simulations. To validate the damage model component tests under bending with superposed tension were performed and simulated. The distributions of pre-strain, pre-damage and thickness from the forming simulation were mapped onto the crash model. The results demonstrated the importance of the coupling between deep-drawing simulation and crash simulation.
Integrated simulation from deep drawing to crash
2010
8 Seiten, 12 Bilder, 5 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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