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| Morvan, Barthelemy; Bles, G; Dumergue, Nicolas; Priour, Daniel. |
| The evaluation of the mesh opening stiffness of fishing nets is an important issue in assessing the selectivity of trawls. It appeared that a larger bending rigidity of twines decreases the mesh opening and could reduce the escapement of fish. Nevertheless, netting structure is complex. A netting is made up of braided twines made of polyethylene or polyamide. These twines are tied with non-symmetrical knots. Thus, these assemblies develop contact-friction interactions. Moreover, the netting can be subject to large deformation. In this study, we investigate the responses of netting samples to different types of solicitations. Samples are loaded and unloaded with creep and relaxation stages, with different boundary conditions. Then, two models have been... |
| Tipo: Text |
Palavras-chave: Numerical model; Experiments; Braided twine; Mesh opening rigidity; Large deformation.. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00348/45899/45581.pdf |
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| Temtching, Vanilla; Augier, Benoit; Dalmas, T.; Fagherazzi, O.; Dumergue, Nicolas. |
| Composite materials are good candidates for hydrofoil manufacturing, ensuring a good balance between strength and weight. This study investigates experimentally and numerically the influence of the laminate layup on the hydrodynamic performances of a foil piercing the free surface. Four real scale hydrofoils with a constant chord, geometrically identical with different composite lay-up made up in glass or carbon fiber, are used for experiments. Mechanical properties of the foils are experimentally obtained and comparisons to numerical approaches calculating composite properties show a good consistency in the different experimental tests and good agreements of numeric and experiments (relative difference < 10%) when looking at the bending stiffness.... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00601/71291/69698.pdf |
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