The development of hybrid trusses made of carbon-fiber-reinforced plastic struts and aluminum knots is currently not standardized, and there is no overall method for the design, although it has been proven that mass reduction is feasible. This paper introduces a new method for computer-aided engineering based design of hybrid trusses using carbon-fiber-reinforced plastic struts and metal nodes based on a modular system. The method includes all design steps from topology optimization to computer-aided design model generation and offers support to the engineer. The method is discussed in theory. A case study is done with a beam-shaped truss. It shows that if the bisection optimization method is combined with further constraints, it is suitable for selecting the optimum struts from a modular system for the truss. The developed approach is a suitable method for designing hybrid trusses. The basis of the method has been developed and will be further detailed and extended.
Efficient and systematic design methods are indispensable aids on the way to effective lightweight solutions. In this article, the necessity of providing the product developer with a design method for the design of endless fibre-reinforced plastic (FRP) components to fulfil fatigue requirements is highlighted. Existing damage models and test methods could be used and extended within such approaches. A suitable method should take into account particularly the variety of requirements for FRP components and consider other influences, e.g. from multi-layer composite design or load introduction, preferably supported by CAE tools. The simple applicability of an effective approach should be demonstrated both on test specimens and on demonstrator components.
INHALT Alles altert – auch Bauteile aus kurzfaserverstärktem Kunststoff, wie sie im modernen Kraftfahrzeugbau häufig eingesetzt werden. Durch eine tausendfach wiederholte mecha- nische Beanspruchung aus Gebrauchslastfällen kommt es zu einer Degradation der mechanischen Eigenschaften, die auch das Crashverhalten der Struktur beeinflusst. Durch Nutzung von Materialdaten, die aus neuwertigen Materialproben gewonnen wurden, bleibt dieser Effekt jedoch derzeit in der Beurteilung der Crashsicherheit unberücksichtigt. Der vorliegende Beitrag stellt daher eine Methode vor, die eine Berücksichtigung der Auswirkungen dieser Materialdegradation in der numerischen Crashsimulation – und damit eine Beurteilung der Crashsicherheit in verschiedenen Lebensphasen – erlaubt.
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