The advantages of additive manufacturing technologies (AMT) make them a very interesting manufacturing tool for several industrial applications. AMT-parts are an economic alternative in case of small number series. AMT provide parts within a short period of time making them very attractive for the automotive industry as well. One field of application is the validation of cockpits' parts by hardware testing where the parts are submitted to various tests, evaluating their long-time behavior in fast motion. The aim is to ensure the high quality of the parts during the whole life cycle of a premium automobile. Series injection molding parts are, due to the complex and expensive tools needed for their fabrication, available very late in the development process when the geometries of the cockpit parts are frozen. Thus the time slot for hardware tests is late and narrow. Therefore it would be beneficial if these hardware tests could be performed earlier using AMT-parts. Requirement is that AMT-parts have properties that are comparable to series parts. One important test in the cockpit's validation is the measurement of parts' stiffness since the parts need to obtain a certain minimum stiffness. In this paper we determined the difference between the stiffness of series and AMT-parts. We also investigated parts made of mould-based rapid manufacturing technologies (MBRMT). Based on the investigations of deBuhr, Krensel and Wagner we assumed that there is a correlation between Young's modulus and stiffness in case of flat, single parts. We extended this idea by investigating the stiffness of a more complex geometry. Furthermore, we extended these approaches to assemblies by measuring the stiffness of the storage compartment on driver's side.
Elastic properties of Additive Manufacturing materials for automotive applications
2014
8 Seiten, Bilder, 10 Quellen
Aufsatz (Konferenz)
Englisch
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