Based on data from experimental investigations with flat specimens made of sheet Moulding Compound (SMC), the influences of different fibre orientations and fibre weight contents on the fatigue strength behaviour of this long-fibre reinforced thermosetting material were studied. SMC is a material with a high damage tolerance. Prior to the manufacture of a component and the experimental test, numerical structural durability tests based on material data allow the estimation of the service life and the identification of the critical areas of the design. In this study, the experimental results of fatigue cycle tests, a concept for fatigue design optimization and estimation of the service life for cyclically loaded components will be shown
KurzfassungFahrzeugräder sind höchstbeanspruchte Sicherheitskomponenten, deren Fertigungsqualität regelmäßig überprüft und deren Betriebsfestigkeit experimentell nachgewiesen werden muss. Unsicherheiten bei der Übertragung der für Metall abgeleiteten Prüfverfahren auf Kunststoffe, kombiniert mit der Tatsache, dass Kunststoffe im Vergleich zum Metall sehr unterschiedliche Versagensmechanismen aufweisen, sind Grund dafür, dass sich Kunststoffräder bisher noch nicht etablieren konnten. Daher soll hier auf der Basis erster experimenteller Untersuchungen an Pkw-Hybridrädern mit Felgen aus faserverstärkten Kunststoffen gezeigt werden, wie über die Eigenschaft der Schadenstoleranz ein Betriebsfestigkeitsnachweisversuch an Kunststoffrädern durchgeführt werden könnte.
This paper deals with the fatigue behaviour of a short fibre reinforced thermoplastic under multi-axial cyclic stress. Based on experimental results on notched and plain specimens, limits of existing methods for the fatigue life estimation in the design process of components exposed to complex multi-axial loads were investigated. During the manufacturing process of short fibre reinforced thermoplastic components, a moderately anisotropic behaviour in stiffness and strength arises. Because of the material's anisotropy, classical failure hypotheses for the assessment of multiaxial load cases do not apply. In this study, a fatigue failure hypothesis was implemented that assesses the stress components in accordance with the correlating fatigue strengths in the material coordinate system, considering potential interaction between the stress components. Striving for a verified multi-usable fatigue life assessment method, multiaxial load cases were examined experimentally. The experimental results on unnotched and notched specimens and the fatigue life estimation on the basis of the Tsai-Wu-failure hypothesis will be presented.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.