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- CFRP (1)
- Faserverbundwerkstoffe (1)
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- Fibre reinforced plastics (FRP) (1)
- Four point bending test (1)
- In-situ effect (1)
- Picture frame test (1)
- Pultruded fibre rods (1)
- Schubeigenschaften (1)
- Schubrahmen (1)
- Shear strength and stiffness (1)
- Spar cap design (1)
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.
Fatigue life evaluation of spar cap materials by four point bending test on width-tapered specimensa
(2015)
The presented research project focuses on an effective method to evaluate the fatigue strength of thick unidirectional laminates to be applied in spar caps. Therefore, a width-tapered bending specimen was developed for a four point loading set up. Static and fatigue loading was performed with the load ratio of R=-1. The complex stress state was investigated numerically with a finite element analysis. Finally, the concept was proven experimentally on specimens made of pultruded fibre rods. The fatigue behaviour of continuous tapered width by water jet cutting was compared to discrete tapering by rod-drop.