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| Lan, Marine; Cartie, Denis; Davies, Peter; Baley, Christophe. |
| Automated fibre placement (AFP) enables the trajectory of unidirectional composite tape to be optimized, but laying down complex shapes with this technology can result in the introduction of defects. The aim of this experimental study is to investigate the influence of gaps and overlaps on the microstructure and tensile properties of carbon-epoxy laminates. First, a comparison between a hand-layup and AFP layup, draped and cured under the same conditions, shows equivalent microstructures and tensile properties. This provides the reference values for the study. Then, gap and overlap embedded defects (more or less severe) are introduced during manufacturing, on two cross-ply layups [(0°/(90°)5/0°] and [(90°/0°)2/90°]. Autoclave cure without a caul plate... |
| Tipo: Text |
Palavras-chave: Carbon fibre; Defects; Mechanical properties; Automated fibre placement (AR). |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00275/38609/37138.pdf |
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| Maurin, R; Davies, Peter; Baral, N; Baley, C. |
| In this study the transverse modulus of three high modulus (M40, M46 and K63712) carbon fibres has first been measured directly by nano-indentation measurements. Transverse tensile tests on unidirectional epoxy composites were then performed, and the comparison was made between transverse fibre properties from indentation and those needed to obtain the measured transverse composite modulus using micromechanics expressions. The latter tended to underestimate values from indentation, by up to 36%, and reasons for this are discussed. Values of transverse fibre modulus determined by both methods decrease as longitudinal fibre modulus increases. |
| Tipo: Text |
Palavras-chave: Transverse tensile; Nano indentation; Epoxy; Carbon fibre. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4502.pdf |
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| Baral, N; Guezenoc, H; Davies, Peter; Baley, C. |
| This paper presents test results from mode I interlaminar fracture and transverse tensile tests on unidirectional carbon/epoxy composites used in racing yacht construction. Fibre modulus has been varied from 380 to 640 GPa. PAN fibre reinforced composite properties, delamination resistance (G(Ie) and G(Ip)) and transverse strain to failure, decrease as fibre modulus increases. Composites based on the highest modulus pitch fibres show higher transverse failure strains than the highest modulus PAN fibre composites. A distinct failure mechanism, crack propagation within the fibres, was observed for the pitch based reinforcement. The transverse tensile tests allowed transverse fibre modulus to be estimated as 11.5 GPa for the PAN and 9 GPa for the pitch... |
| Tipo: Text |
Palavras-chave: Carbon fibre; Fracture; Deformation; Delamination; Composite materials. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3723.pdf |
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