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Talks and Poster Presentations (with Proceedings-Entry):

M. Rodríguez-Hortalá, D. Salaberger, S. Hernández, M. Holzmeier, H.P. Degischer, J. Kastner:
"Characterisation of defects in carbon fibre reinforced polymers (CFRP)";
Talk: 18. DGM Symposium Verbundwerkstoffe und Werkstoffverbunde, Chemnitz (Deutschland); 03-30-2011 - 04-01-2011; in: "Tagungsband zum 18. Symposium Verbundwerkstoffe und Werkstoffverbunde", TU Chemnitz, Schriftenreihe Werkstoffe und Werkstofftechnische Anwendungen, Band 41 (2011), ISBN: 978-3-00-033801-4; 208 - 215.



English abstract:
X-ray computed tomography and classical materialography methods (light optical microscopy LOM and scanning electron microscopy SEM) are useful tools for evaluating defects in 3D and 2D, respectively. Unidirectional continuous carbon fibre reinforced polymers (CFRP) can be analyzed by means of these methods. A correlation between processing defects within specimens, which are characteristic for the production process, and the beginning and development of failure during testing is the long term aim of this study. Two different geometries are studied: tubes produced by pultrusion and laminates manually stacked and cured in a hot press. Due to the different geometry and microstructural features of the samples, suitable mechanical tests are selected. The tubes are tested by torsion where two distinct modes of failure are identified: fibre fracture and matrix crack development. A bending load applied to the laminates induces the following failure modes: delamination (favoured by porosity), localized fibre fracture and intra-laminar cracks. The mode of failure depends on the rate of loading, the geometry of the samples (the tube diameter/thickness ratio or the laminate width/thickness ratio) as well as on the nature of the present defects and their distribution within the sample.

Keywords:
CFRP, X-ray CT, defects characterisation, torsion test, bending test

Created from the Publication Database of the Vienna University of Technology.