Matthieu Mulle

Contribution of Embedded Optical Fiber with Bragg Grating in Composite Structures for Tests-Simulations Dialogue

The main topic of this paper deals with the stress analyses—tests dialogue in composite structures considering the influence of the manufacturing conditions of composite material within the structure. The scientific interest of embedded instrumentation exploited through a multiscale approach featuring optical fibers with Bragg gratings is discussed. The multiscale material requests multiscale data for calculation. The addressable scales are thus macro (or structural) scale and meso (ply) scale concerning specimens representative of aeronautical structures (whether instrumented or not). Discrepancies on both meso and macro scales obtained between the measurements and the calculations are evaluated regarding the variability of the numerical input data (i.e., elastic characteristics on average of the composite material).

Benefit from Embedded Sensors to Study Polymeric Composite Structures

The present paper deals with the use of optical fibers with Bragg gratings for the identification of process-properties relations for composite structures. This study relates a 7 year-experience in the field of process and mechanical characterization of composite parts. It highlights some major topics in terms of technological issues such as sensor integration, information discrimination and measurement accessibility. Results of process monitoring concerning autoclave cure and filament winding are shown through which initial states are identified. Finally, structural tests of instrumented parts are presented, showing the efficiency of the embedded sensors to allow test-calculation dialogues and thus properties identification.