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- 2014 (5) (entfernen)
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- Damage evolution (1)
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- Faser-Kunststoff-Verbunde (1)
- Fibre reinforced plastics (FRP) (1)
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- Multiaxial loading (1)
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- Picture frame test (1)
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Eingeladener Vortrag
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The multiaxial fatigue damage behaviour of short fibre reinforced polyamide 6 is analysed on injection moulded tube samples. In parallel with the fatigue tests, the damage state is evaluated
nondestructively by X-ray refraction analysis which detects inner surfaces by the variation of electron density. By applying X-ray refraction analysis and a model based on by GÜNZEL the micro damage evolution can be separated into fibre matrix debonding and matrix-Micro cracking.
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.
Für die Schubkennwertermittlung an faserverstärkten Kunststoffen existieren verschiedene Verfahren, die nur eine Prüfung bis zu einer vorgegebenen maximalen Schubdehnung zulassen. Die Grasse Zur Ingenieurgesellschaft hat auf Basis eines an der BAM entwickelten Schubrahmens ein Schubprüfsystem etabliert, das diese Nachteile aufhebt. Damit ist es nun erstmals möglich, Schubkennwerte ohne Einschränkung einer maximalen Schubdehnung effizient und mit sehr guter Reproduzierbarkeit zu ermitteln.