Despite their simplicity quasi static fatigue load cases are strong tools to develop car bodies if experienced engineers do the simulation and evaluation. The biggest disadvantage of that kind of simulation is at the same time their biggest advantage: simple quasi static loads are applied onto the most simple body model possible (BIW). Because of their simplicity those load cases can be applied very early in the development process and give a good insight into the basic structural behaviour. More complex load cases like static superposition of fatigue load histories enable a deeper insight into the real behaviour under loading and account e.g. more realistic for the actual chassis tuning and the interaction of the real tire set up and the road. The simulation set up is moderate and depends on the level of detail which is included in the model. Disadvantage is that more preparation work is needed to get meaningful animations which are necessary for root cause analysis. Also vibrational effects may not be considered adequately. Therefore the dynamic analysis by means of the method of modal superposition is applied onto a full trimmed body to eliminate the disadvantages of the above described methods. Important and difficult is the choice of the damping values. Additionally the effort to set up a clean and faultless model is much higher than for a simple BIW. Therefore all methods need to be applied in succession on each other or in parallel, respectively, to be confident about the analysis results. Each method supports the other. Beside the fatigue analysis the evaluation of the strength behaviour of the car body becomes more important due to emerging market needs, larger rim sizes and potentially stiffer tires. Because of accepted local plastic deformation interactions between FE results and MBS become important and need to be considered to get accurate extreme load levels for nonlinear simulations. This is taken into account at the Adam Opel GmbH. All methods need - independent on the degree of model refinement - the evaluation by an experienced engineer who is able to correlate the new results with acquired detailed findings from past projects. Finally, the experience enables the company to reduce the hardware stages to a minimum without over-engineering the structure.


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    Titel :

    Strength and durability analysis of car bodies based on virtual load data


    Weitere Titelangaben:

    Festigkeits- und Haltbarkeitsanalyse von Pkw-Karosserien auf Basis virtuell ermittelten Betriebslasten


    Beteiligte:
    Schick, Alexander (Autor:in) / Künkler, Boris (Autor:in) / Graf, Gerhard (Autor:in)


    Erscheinungsdatum :

    2009


    Format / Umfang :

    11 Seiten, 6 Bilder, 12 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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