|
|
|
|
|
| Davies, Peter; Bourmaud, A.; Pajot, A.; Baley, C.. |
| This short communication describes results from a preliminary characterization of the dimensions and mechanical properties of matricaria maritimum fibres. The aim is to develop a complementary industrial application of these plants, which are grown along the coast mainly for pharmaceutical use. The fibres are shown to be of small diameter, 5-10 mu m, and tubular in form. Nano-indentation on fibres and tensile tests on fibre bundles provide an indication of the mechanical behaviour of these fibres, which are similar to those of sisal (leaf fibre) and miscanthus (grass fibre), and may be interesting for reinforcement of polymer matrix composites. |
| Tipo: Text |
Palavras-chave: Natural fibre; Nano-indentation; Tensile properties. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00042/15369/12790.pdf |
| |
|
| |
|
|
| Baral, N.; Cartie, D. D. R.; Partridge, I. K.; Baley, C.; Davies, Peter. |
| This paper presents results from a test developed to simulate the water impact (slamming) loading of sandwich boat structures. A weighted elastomer ball is dropped from increasing heights onto rigidly supported panels until damage is detected. Results from this test indicate that honeycomb core sandwich panels, the most widely used material for racing yacht hulls, start to damage due to core crushing at impact energies around 550 J. Sandwich panels of the same areal weight and with the same carbon/epoxy facings but using a novel foam core reinforced in the thickness direction with pultruded carbon fibre pins, do not show signs of damage until above 1200 J impact energy. This suggests that these will offer significantly improved resistance to wave impact.... |
| Tipo: Text |
Palavras-chave: Honeycomb; Three-dimensional reinforcement; Impact behaviour; Mechanical testing. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00002/11311/7840.pdf |
| |
|
|
| Le Duigou, A.; Deux, J. M.; Davies, Peter; Baley, C.. |
| Biocomposites are sensitive to water, and previous work on flax reinforced PLLA showed a large drop in mechanical properties after immersion (Le Duigou et al. 2009). Unreinforced PLLA was much less sensitive. This paper presents a strategy to reduce the influence of wet ageing by adding extra layers of PLLA on the biocomposite surface. Weight gain measurements show that a PLLA coating 350 um thick reduces weight gain by half, and biocomposite stiffness and strength after ageing are improved by 100% compared to uncoated composite behaviour. Thermal analysis and microscopic examination are used to show damage mechanisms with and without protection. Property changes are shown to be quasilinearly related to weight gain. |
| Tipo: Text |
|
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00044/15511/12898.pdf |
| |
|
|
| Le Duigou, A.; Davies, Peter; Baley, C.. |
| Natural fibre reinforced biopolymer composites, or biocomposites, are an alternative to the glass fibre reinforced thermoset composites widely used today in marine applications. Biocomposites offer good mechanical properties and total biodegradability, but if they are to be adopted for marine structures their durability in a seawater environment must be demonstrated. In the present study unreinforced PLLA (Poly(L-Lactic acid)), injected and film stacked flax composites with the same PLLA matrix have been examined. All the samples were aged in natural seawater at different temperatures in order to accelerate hygrothermal ageing. Changes to physico-chemical and mechanical behaviour have been followed by weight measurements, thermal and gel permeation... |
| Tipo: Text |
Palavras-chave: Mechanical properties; Hygrothermal ageing; Biopolymer; Natural fibre; Composites. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6639.pdf |
| |
|
|
|
