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| Ghoreishi, Seyed Reza; Davies, Peter; Cartraud, Patrice; Messager, Tanguy. |
| In part I of this study it was shown that, to model synthetic fiber ropes, two scale transition models can be used in sequence. The first model (continuum model) has been presented in the part I and the present paper examines the behavior of a fibrous structure consisting of 6 helicoidal strands around a central core (1 + 6 structure). An analytical model will be presented which enables the global elastic behavior of such a cable under tension-torsion loading to be predicted. In this model, first, the core and the strands are described as Kirchhoff-Love beams and then the traction-torsion coupling behavior is taken into account for both of them. By modeling the contact conditions between the strands and the core, with certain assumptions, it is possible to... |
| Tipo: Text |
Palavras-chave: Testing; Analytical model; Aramid; Wire; Simple strand; Fiber rope. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2596.pdf |
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| Ghoreishi, Seyed Reza; Cartraud, Patrice; Davies, Peter; Messager, Tanguy. |
| Synthetic fiber ropes are characterized by a very complex architecture and a hierarchical structure. Considering the fiber rope architecture, to pass from fiber to rope structure behavior, two scale transition models are necessary, used in sequence: one is devoted to an assembly of a large number of twisted components (multilayered), whereas the second is suitable for a structure with a central straight core and six helical wires (1 + 6). The part I of this paper first describes the development of a model for the static behavior of a fibrous structure with a large number of twisted components. Tests were then performed on two different structures subjected to axial loads. Using the model presented here the axial stiffness of the structures has been... |
| Tipo: Text |
Palavras-chave: Testing; Analytical model; Multilayered structures; Aramid; Yarn; Fiber rope. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2595.pdf |
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| Messager, Tanguy; Chauchot, Pierre; Bigourdan, Benoit. |
| This numerical study deals with the stiffened composite underwater vessel design. The structures under investigation are laminated cylinders with rigid end-closures and inter-nal circumferential and longitudinal unidirectional composite stiffeners. Structural buckling induced by the high external hydrostatic pressure is considered as the major failure risk. An optimization design tool has been developed to obtain the reinforcement definition which maximizes the limit of stability: an analytical model of cylindrical composite shell buckling has been coupled to a genetic algorithm procedure. The numerical optimization tests carried out corroborate design tendencies validated previously by experiments. |
| Tipo: Text |
Palavras-chave: Optimization; Buckling; Stiffeners; Cylinders; Composite. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/acte-6474.pdf |
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| Messager, Tanguy; Pyrz, Mariusz; Gineste, Bernard; Chauchot, Pierre. |
| This paper deals with the optimal design of deep submarine exploration housings and autonomous underwater vehicles. The structures under investigation are thin-walled laminated composite unstiffened vessels. Structural buckling failure due to the high external hydrostatic pressure is the dominant risk factor at exploitation conditions. The search of fiber orientations of the composite cylinders that maximize the stability limits is investigated. A genetic algorithm procedure coupled with an analytical model of shell buckling has been developed to determine numerically optimized stacking sequences. Characteristic lamination patterns have been obtained. FEM analyses have confirmed the corresponding significant increases of buckling pressures with respect to... |
| Tipo: Text |
Palavras-chave: Experimental results; Optimal design; Buckling; Lamination; Cylinder; Composite. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-759.pdf |
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