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R. Pfaller, P. Gergely, A. Weinert
Today composite materials are typically used for several components in aviation industry. They are especially well known for their excellent fatigue and damage tolerant behavior. Due to the opportunity of load adapted specific fiber layups, it is possible to design more efficient and weight reduced components in contrast to metal parts. But on the other hand, fiber composites are considered with remarkable reduction factors. Currently, for composite components, the aviation regulations request to reduce the allowable static and dynamic strength because of material scattering, compression after impact, notch sensitivity and hot/wet environmental conditions. Morever, there is often a discussion about the possible high scatter of fiber materials. It is assumed by default that the scatter is higher than that of the metallic materials. This paper shows the investigations performed with coupon and component test results to determine the scatter of the specimens and the comparison with the mean value. For this purpose the single test results (i.e. data points) are projected to the same number of load cycles. Without the influence of manufacturing deviations, which can be detected by quality inspection measures, the results show similar scatter bands as metallic coupon and component tests. The outcome of this study can be used as contribution to clarify the discussion on additional reduction factors for the scatter of the fiber reinforced composite material strength.
Deutscher Luft- und Raumfahrtkongress 2012, Berlin
Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2013
21,0 x 29,7 cm, 10 Seiten
Stichworte zum Inhalt:
bending specimens, composites, fatigue, fibre, scatter, shear specimens, Weibull function