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| Casari, Pascal; Jacquemin, Frederic; Davies, Peter. |
| This paper presents a method for the characterization of residual stresses in thick filament wound tubes. The three materials considered in the study are wet wound epoxy composite tubes based on E glass, R glass and T700 carbon fibres with three winding angles, [+/- 35], [+/- 55] and [+/- 851 with respect to the longitudinal axis. The aim of the present work is to measure internal stresses, based on strains liberated by cutting composite tubes, and to compare results with predictions from a residual stress model based on the classical equations of solid mechanics. This leads to a simple technique which allows the quick identification of the effects of manufacturing and moisture on the internal multi-axial stress level. |
| Tipo: Text |
Palavras-chave: Moisture; Tube; Composite; Residual stress. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1212.pdf |
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| Hernandez-moreno, H.; Collombet, F.; Douchin, B.; Choqueuse, Dominique; Davies, Peter; Gonzalez Velazquez, J. L.. |
| This article is the second of a series of three papers concerning monitoring of filament wound cylinders using Bragg gratings. In this second part, the tooling presented in Part I is used to embed gratings and thermocouples in filament wound glass reinforced epoxy composite cylinders during fabrication. Bragg grating strain was obtained from wavelength and temperature response, by a calibration technique described here. Results from tests on five cylinders show the Bragg grating's capability to monitor strain evolution during fabrication, and the capacity to detect several phenomena occurring during cure is established, in addition to quantifying the initial material condition of the cylinder before it enters service. |
| Tipo: Text |
Palavras-chave: Filament winding; Non destructive testing; Residual stress; Smart materials. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-7329.pdf |
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