The aim of reducing the CO2 emission of vehicles has started an intensive development of new light weight structures. In this contents magnesium offers promising properties like low density, good weldability, good mechanical damping etc. Whereas the application of casted components is widely spread the use of formed and extruded profiles is actually very limited but shows additional weight saving potential compared to steel and aluminum. However the effective use of new materials requires a complete description of material behavior under all loading conditions in vehicles life. So weak points can be detected at an early design state and optimization steps can be performed by the developing engineer. At this state the development process can be supported by computer simulation if suited material models are available. The Crash Simulation of Magnesium Structures with Finite Element Methods demands the use of suitable material and failure models. An associated plasticity model describing the complex asymmetric yield behaviour in tension and compression of Mg extrusions has been developed during the InMaK project (Innovative Magnesium Compound Structures for Automobile Frames) supported by the German Federal Ministry for Education and Research (BMBF). Differences to the material model 124 in LS-DYNA are exposed. In order to describe the failure behaviour of Mg extrusions under multiaxial loading in FEM crash simulation this constitutive model has been combined with a fracture model for ductile and shear fracture. The fracture model has been added to the user defined constitutive magnesium model in LS-DYNA. The experimental investigations carried out on model components are compared with numerical derived results. Experimental methods for fracture parameter evaluation are shown and general aspects of metal failure due to fracture as well as different modelling techniques are discussed.
Improved plasticity and failure models for extruded Mg-profiles in crash simulations
Verbesserte Plastizitäts- und Werkstofffehlermodelle für stranggepresste Mg-Profile in Crashsimulationen
2003
11 Seiten, 9 Bilder, 3 Quellen
Aufsatz (Konferenz)
Englisch
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