||Morvan Barthelemy1, 2, Bles G2, Dumergue Nicolas1, Priour Daniel1
||1 : IFREMER, Plouzane, France
2 : ENSTA Bretagne FRE CNRS 3744 IRDL F-29200 Brest, France
||ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering. 5-10 june 2016, Cret Island, Greece
||Eccomas 2016 Proceedings. M. Papadrakakis, V. Papadopoulos, G. Stefanou, V. Plevris (eds.) MS 706 - Modeling of fiber-based structures - textiles and textile reinforced composites. n°9824, pp.1-19
||Numerical model, experiments, braided twine, mesh opening rigidity, large deformation.
||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 developed: an analytical model and a finite element model. The last one was used to assess, with an inverse identification algorithm, the bending stiffness of twines. In this paper, experimental results and a model for netting structures made up of braided twines are presented. During dry forming of a composite, for example, the matrix is not present or not active, and relative sliding can occur between constitutive fibres. So an accurate modelling of the mechanical behaviour of fibrous material is necessary. This study offers experimental data which could permit to improve current models of contact-friction interactions , to validate models for large deformation analysis of fibrous materials  on a new experimental case, then to improve the evaluation of the mesh opening stiffness of a fishing net
|Publisher's official version