Evaluation of the transversal strain state in a satin weave composite using fibre Bragg gratings

E. Voet; G. Luyckx; J. Degrieck; W. Van Paepegem

doi:10.1117/12.885167

17 May 2011 Evaluation of the transversal strain state in a satin weave composite using fibre Bragg gratings

E. Voet, G. Luyckx, J. Degrieck, W. Van Paepegem

Proceedings Volume 7753, 21st International Conference on Optical Fiber Sensors; 77530K (2011) https://doi.org/10.1117/12.885167
Event: 21st International Conference on Optical Fibre Sensors (OFS21), 2011, Ottawa, Canada

Abstract

Satin woven composites can be seen as a series of connected unit cells with a definite length and width. Along the length and width of one unit cell, local strain fields can vary significantly due to the yarn interlacing pattern. Embedded Type I FBGs with a 80 μm- and 125 μm cladding diameter are used to study the internal transversal strain variations in unloaded and tensile loaded thermo-plastic 5-harness satin weave composite test specimens. The residual strains are examined at different (axial) load levels up to 300MPa and 1.2million cycles. Differential transversal strains up to 0.07% are presented. Results show that the embedded FBGs are capable of measuring long term the transversal strain distributions. It is found that the yarn interlacing pattern of the satin weave composite causes complex and random local strain fields during loading and that, even though axial strain measurements are matching very well with external strain measurements, a large scatter exists in local transversal strain states between the different composite test-coupons.

Citation Download Citation

E. Voet, G. Luyckx, J. Degrieck, and W. Van Paepegem "Evaluation of the transversal strain state in a satin weave composite using fibre Bragg gratings", Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 77530K (17 May 2011); https://doi.org/10.1117/12.885167

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