Entire Life Time Monitoring of Filament Wound Composite Cylinders Using Bragg Grating Sensors: III. In-Service External Pressure Loading |
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Authors: | H Hernández-Moreno F Collombet B Douchin D Choqueuse P Davies |
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Affiliation: | (1) Université de Toulouse; INSA, UPS, Mines Albi, ISAE; ICA (Institut Clément Ader), IUT P. Sabatier, 133c, avenue de Rangueil, 31077 Toulouse, France;(2) Instituto Politécnico Nacional, ESIME Unidad Ticomán, Av. Ticomán No. 600, Col. San José Ticomán, 07340 México D. F., México;(3) IFREMER, Materials & Structures group, Brest Centre, BP70, 29280 Plouzané, France |
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Abstract: | This article is the third of three papers describing a study of the monitoring of filament wound composite cylinders for underwater
applications. Part I described the technological issues and the development of specimens instrumented with embedded gratings
and thermocouples, with the aim of monitoring the temperature and strain changes during the cylinder manufacturing presented
in Part II. Residual strains are not negligible, over 1,000 axial micro-strain at the end of the curing cycle. Part III describes
the response of these cylinders to hydrostatic pressure loading. The same embedded fiber optical Bragg gratings (FBGs) used
for parts I and II of the study are here used as strain gauges. Their response is compared to that of classical resistive
strain gages bonded to the inner surface of the tube. Results from these initial tests demonstrate the embedded FBG sensor’s
capability to monitor structural health of an underwater structure from fabrication throughout its service life. Embedded
instrumentation records strains during pressure cycles up to final failure, without affecting the cylinder response. |
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Keywords: | Polymer-matrix composites (PMCs) Smart materials Residual stress Filament winding Underwater application |
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