TY - CONF A1 - Trappe, Volker A1 - Basan, Ricardo A1 - Grasse, Fabian ED - Paris, Federico T1 - Stiffness and fracture of shear loaded laminates with unidirectional and biaxial fibre orientation investigated with a picture frame test T2 - ECCM16 - 16TH EUROPEAN CONFERENCE ON COMPOSITE MATERIALS N2 - Fibre Reinforced Plastics (e.g. CFRP, GFRP) characteristically show nonlinear stress-strain behaviour due to intralaminar shear loading. The determination of the in-plane shear stiffness and strength for this class of material is difficult and common test standards and methods of analysis are partially inaccurate. The identification of the in-plane shear properties was made with an especial designed “picture frame test device” which enables shear loading up to 950N/mm. Therefore the strength limit can be reached at specimens with adequate thickness and a high safety factor against buckling. Due to the chosen design the maximum of the shear loading and the final failure occur in the centre of the specimen. The experiments match with the numerical analysis. T2 - ECCM16 - 16TH EUROPEAN CONFERENCE ON COMPOSITE MATERIALS CY - Seville, Spain DA - 22.06.2014 KW - Picture frame test KW - Fibre reinforced plastics (FRP) KW - Shear strength and stiffness KW - In-situ effect PY - 2014 SN - 978-84-616-9798-4 VL - 2014 SP - ID0263 - 1 EP - 8 PB - ECCM CY - Sevilla AN - OPUS4-37617 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Grasse, Fabian A1 - Trappe, Volker A1 - Thöns, Sebastian A1 - Said, Samir ED - De Roeck, G. ED - Degrande, G. ED - Lombaert, G. ED - Müller, G. T1 - Structural health monitoring of wind turbine blades by strain measurement and vibration analysis T2 - EURODYN 2011 - 8th International conference on structural dynamics (Proceedings) N2 - Wind turbine blades have to withstand a high number of load cycles in mostly hard weather conditions over 20 years. In a research project BAM and several partners have designed, evaluated and tested a condition monitoring system for all parts of a wind turbine. At a rotorblade with a length of 58 m fibre bragg grating sensors were applied for in-service strain measurement. Additionally a complex test rig was designed to enable real biaxial loading conditions at a representative test rotor blade to simulate the mechanical loading conditions in the lab. In this test blade with a length of 8 m also fibre bragg grating sensors were implemented to determine their influences for the structure and the condition monitoring system. Vibration measurements were carried out at different test phases. The results were compared with finite element strain and modal analysis. T2 - EURODYN 2011 - 8th International conference on structural dynamics CY - Leuven, Belgium DA - 04.07.2011 KW - Rotor blade KW - Test blade KW - Modal analysis KW - Condition monitoring PY - 2011 SN - 978-90-760-1931-4 IS - MS25 Tue SP - 3490 EP - 3497 AN - OPUS4-25076 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Grasse, Fabian A1 - Trappe, Volker A1 - Hickmann, Stefan ED - Grellmann, W. T1 - Zustandsüberwachung von Rotorblättern - Konzeptstudie mittels Bauteilkomponentenversuch T2 - DVM-Tagung Werkstoffprüfung 2011 - Neue Entwicklungen in der Werkstoffprüfung - Herausforderungen an die Kennwertermittlung T2 - DVM-Tagung Werkstoffprüfung 2011 - Neue Entwicklungen in der Werkstoffprüfung - Herausforderungen an die Kennwertermittlung CY - Berlin, Deutschland DA - 2011-12-01 KW - Rotorblatt KW - Faserverbundwerkstoffe KW - Modalanalyse KW - Zustandsüberwachung KW - Faser-Bragg-Gitter-Sensoren KW - Rotor blade KW - Fibre reinforced plastics KW - Modal analysis KW - Condition monitoring KW - Fibre bragg grating sensors PY - 2011 SN - 978-3-9814516-1-0 SN - 1861-8154 N1 - Serientitel: DVM-Bericht – Series title: DVM-Bericht IS - 643 SP - 167 EP - 172 AN - OPUS4-25078 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Basan, Ricardo A1 - Trappe, Volker A1 - Grasse, Fabian T1 - Bestimmung der Schubeigenschaften von Faserverbundwerkstoffen mittels eines Schubrahmens T2 - Deutscher Luft- und Raumfahrtkongress 2009 T2 - Deutscher Luft- und Raumfahrtkongress 2009 CY - Aachen, Deutschland DA - 2009-09-08 KW - Faserverbundwerkstoffe KW - Schubrahmen KW - Schubeigenschaften PY - 2009 SN - 1868-8764 IS - DocumentID: 121274 SP - 1 EP - 8 AN - OPUS4-20464 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -