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# Experimental determination of the multi-axial strain transfer from CFRP-laminates to embedded Bragg sensor

Nicolas Lammens (UGent) , Geert Luyckx (UGent) , Joris Degrieck (UGent) and Wim De Waele (UGent)
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Abstract
When embedded, optical fibre Bragg gratings are considered to be very valuable in terms of strain measurements of large composite structures for a number of reasons (safety rules, design criteria…). However, the strain field measured by the embedded optical fibre Bragg grating is not necessarily the one present in the composite material. Especially the measurement of transverse strain components is not that straight forward! In a previous paper, the multi-axial strain transfer from host material to sensor was determined by using a finite element method. In this paper, a method is defined to experimentally determine the multi-axial strain transfer. As an example, the strain transfer of a cross-ply laminate to a non-coated 80μm diameter Bragg sensor was determined. The different experiments (tensile tests and transverse compression tests) needed to obtain this transfer matrix are discussed. Good similarity was found between the numerically and experimentally determined transfer matrices.

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## Citation

Chicago
Lammens, Nicolas, Geert Luyckx, Joris Degrieck, and Wim De Waele. 2011. “Experimental Determination of the Multi-axial Strain Transfer from CFRP-laminates to Embedded Bragg Sensor.” In Smart Structures and Materials, 5th ECCOMAS Thematic Conference, Proceedings, 482–485. Barcelona, Spain: ECCOMAS.
APA
Lammens, N., Luyckx, G., Degrieck, J., & De Waele, W. (2011). Experimental determination of the multi-axial strain transfer from CFRP-laminates to embedded Bragg sensor. Smart Structures and Materials, 5th ECCOMAS thematic conference, Proceedings (pp. 482–485). Presented at the 5th ECCOMAS thematic conference on Smart Structures and Materials (SMART  ’11), Barcelona, Spain: ECCOMAS.
Vancouver
1.
Lammens N, Luyckx G, Degrieck J, De Waele W. Experimental determination of the multi-axial strain transfer from CFRP-laminates to embedded Bragg sensor. Smart Structures and Materials, 5th ECCOMAS thematic conference, Proceedings. Barcelona, Spain: ECCOMAS; 2011. p. 482–5.
MLA
Lammens, Nicolas, Geert Luyckx, Joris Degrieck, et al. “Experimental Determination of the Multi-axial Strain Transfer from CFRP-laminates to Embedded Bragg Sensor.” Smart Structures and Materials, 5th ECCOMAS Thematic Conference, Proceedings. Barcelona, Spain: ECCOMAS, 2011. 482–485. Print.
@inproceedings{1906650,
abstract     = {When embedded, optical fibre Bragg gratings are considered to be very valuable in terms of strain measurements of large composite structures for a number of reasons (safety rules, design criteria{\textellipsis}). However, the strain field measured by the embedded optical fibre Bragg grating is not necessarily the one present in the composite material. Especially the measurement of transverse strain components is not that straight forward! In a previous paper, the multi-axial strain transfer from host material to sensor was determined by using a finite element method. In this paper, a method is defined to experimentally determine the multi-axial strain transfer. As an example, the strain transfer of a cross-ply laminate to a non-coated 80\ensuremath{\mu}m diameter Bragg sensor was determined. The different experiments (tensile tests and transverse compression tests) needed to obtain this transfer matrix are discussed. Good similarity was found between the numerically and experimentally determined transfer matrices.},
author       = {Lammens, Nicolas and Luyckx, Geert and Degrieck, Joris and De Waele, Wim},
booktitle    = {Smart Structures and Materials, 5th ECCOMAS thematic conference, Proceedings},
language     = {eng},
location     = {Saarbr{\"u}cken, Germany},
pages        = {482--485},
publisher    = {ECCOMAS},
title        = {Experimental determination of the multi-axial strain transfer from CFRP-laminates to embedded Bragg sensor},
year         = {2011},
}