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| Davies, Peter; Riou, Luc; Mazeas, Florence; Warnier, Philippe. |
| A study of thermoplastic matrix composites has been performed to investigate their use in underwater applications such as oceanography, submarine, and sub-sea offshore structures. This article first presents six candidate materials. Results from simple mechanical and seawater aging screening tests on flat specimens are then described. Glass/epoxy and carbon/epoxy composites are used as reference materials. Two materials emerged from this process, glass/PEI and carbon/PEEK. Cylinders of both were manufactured and subjected to hydrostatic pressure tests, and results are compared to those for glass/epoxy and carbon/epoxy cylinders of similar geometry. The carbon/PEEK material appeared most promising. It resisted pressures in excess of 90 MPa and was retained... |
| Tipo: Text |
Palavras-chave: Damage tolerance; Glass/PEI; Carbon/PEEK; Aging; Hydrostatic pressure; Cylinder. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-1037.pdf |
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| Derombise, Guillaume; Chailleux, Emmanuel; Forest, Bertrand; Riou, Luc; Lacotte, Nicolas; Van Schoors, L. Vouyovitch; Davies, Peter. |
| Aramid fibers are today proposed in ropes and cables for marine applications. As these highly crystalline materials are loaded in tension for a longer period in seawater, their long-term mechanical behavior has to be understood. However, the response is time-dependent and exhibits a nonlinear effect with stress. In this study, two types of aramid fibers are studied: Twaron and Technora. Mechanical properties are measured using static tensile tests and creep-recovery tests. A nonlinear viscoelastic-viscoplastic model, based on the Schapery formulation, allows discriminating between the instantaneous and the time-dependent response as well as the reversible and nonreversible phenomena (plasticity). First, this procedure allows the overall mechanical behavior... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00039/15049/12604.pdf |
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