A thin-wall open channel beam, fabricated from high strength Dual Phase sheet steel, subjected to 3-point bending and constant velocity boundary condition, is investigated to validate material performance for automotive crash applications. Specifically quantitative validation of material tensile data determined from high speed tests and component models, and qualitative validation of materials resistance to fracture. The open channel beam is subjected to quasi-static and increasing loading speed and in all cases, large displacement in which deformation involves formation of a plastic hinge. This paper describes development of test procedure, notably beam specimen design, measurement system and boundary conditions, using both experimental and numerical techniques. The new test procedure, as a compliment to crush testing, will increase confidence in the modeling and application of new advanced higher strength materials in automotive crash structures. The test procedure is capable of generating meaningful data in the velocity range 10 mm/s through to 5000 mm/s. Quantitative measurements from test include force, time and displacement, from which the developed velocity may be derived during loading cycle. No quantitative performance data may be obtained above 5000 mm/s, the test is useful in providing a qualitative measurement of material performance, specifically its ability to resist fracture in the design range of interest for crash structures. For the material tested, edge cracking was not visible in the material. Modelling and experiments have shown a measurable strength hardening effect in the material in the velocity range 10 to 5000 mm/s, which is attributed to material strain rate sensitivity. The modelling study has established the essential model input requirements to validate material strain rate sensitivity data for use in crash simulation tools. The quality of model fit to experimental result is dependent on mesh resolution, especially at corner radius together with element type.


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    Title :

    Validating dynamic tensile mechanical properties of sheet steels for automotive crash applications


    Contributors:
    Wood, P.K.C. (author) / Schley, C.A. (author) / Buckley, M. (author) / Walker, B. (author) / Dutton, T. (author)


    Publication date :

    2007


    Size :

    13 Seiten, 12 Bilder, 3 Tabellen, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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