Discussing the capabilities of adhesives in the virtual development phase of structures participating in the crash energy management, it can be concluded that the accuracy level of a bonded joint should increase. Due to the complex behavior of the adhesive material, especially in crash, not only the prediction of the maximum force but also the failure mechanism including the softening and fracture behavior should be integrated into describing the behavior of such materials. As numerous adhesives are available, the material model selection for crash simulation is discussed comparing different types of adhesives under static and dynamic loading. Within the material selection process, the benefits for crash-stabilized adhesives are related to the performance expectations and crash requirements. As the structure material is dominating the energy dissipation, the joint should keep the substrates together to get the most out of the energy dissipation from the substrates as well as to keep the structure integrity as long as possible. To predict this behavior in an appropriate material model, material characterization and testing methods for the parameter identification have been provided. For crash-stabilized BETAMATE adhesives, DOW Automotive suggests to use Gurson representing the adhesive behavior. Taking the critical timestep of a detailed discretization into account, a macro-element approach is suggested, to keep calculation times for e.g. full car crash simulations feasible. The representation of such a macro-element is discussed. Results of the methodology are validated with an axial crush test of a hat section profile closed by bonding with a crash-stable adhesive with a flat plate. This setup allows comparing the overall force-deflection (energy) as well as to appraise the quality of the failure model. For this type of component the accuracy of the model is acceptable. DOW Automotive will continue to broaden the material models to the main BETAMATE grades used in crash relevant applications.


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    Title :

    Validation and assessment of the Gurson material model for structural adhesives


    Additional title:

    Validierung und Beurteilung des Gurson-Materialmodells für Strukturklebstoffe


    Contributors:


    Publication date :

    2007


    Size :

    14 Seiten, 13 Bilder, 4 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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