Of increasing importance in the automotive industry is the reduction of development time and costs by virtual prototyping. The accuracy of the numerical methods depends essentially on the correct modelling of the material behaviour and on the assessment of material properties. Especially, the simulation of material damage is important for the development of next-generation ASF (AUDI Space Frame) technology. In this paper, the deformation and fracture behaviour of two aluminium base materials and two welded joints (heat affected zones) is characterised by tests with miniature specimens and simulations with the modified Gurson model which describes the influence of stress triaxiality and loading rate on the damage development with good accuracy. It was found that the anisotropy effect has to be taken into account to model the tension tests with flat specimens. The application of these damage models in, e.g., crash simulations with commercial finite element codes like PAMCRASH gives very promising results. However, the direct transferability of laboratory data to the PAMCRASH-code suffers from the facts, that at this time only small plastic deformations are covered, and, that for practical reasons critical zones in the structure can not be modelled with the necessary mesh refinement. First steps to overcome these difficulties are presented and discussed.
Improved description of the material behaviour of aluminium automobile components by the Gurson model
Verbesserte Beschreibung des Materialverhaltens von Aluminium-Automobilteilen mit Hilfe des Gurson-Modelles
1998
8 Seiten, 8 Bilder, 4 Quellen
Conference paper
English
British Library Conference Proceedings | 1998
|Improved description of the material behavior of aluminium automobile components by the Gurson model
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