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Next Generation Manufacturing Fixtures: CFRP Structures Using “In Situ” Health Monitoring
Technical Paper
2015-01-2619
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Lightweight Production Technology (LWPT) is today a well-established technology in the automotive industry. By introducing light weight fixtures manufactured from Carbon Fiber Reinforced Plastics (CFRP) in aeronautical applications, new challenges as well as possibilities of in-situ health monitoring emerges.
The present paper present results from experimental investigations using optical fibers with multiplex Bragg gratings (FBG) as strain gauges in an industrial CFRP fixture.
Fixtures were manufactured of laminates made from CFRP. Measurements have been performed on a single CFRP beam with dimensions (8000 × 500 × 500 mm), used as a structural part in a larger assembly (9000 × 4000mm). The optical fibers were placed in between two laminates on two sides of the beam. The measurement data from the FBGs were compared and correlated to the measured displacements of the beam and the applied loads.
The results show that for an eight meter long CFRP beam, it is possible to measure and detect displacements of 0.12 mm (load = 36kg), and resolve a displacement of 0.02 mm (Δload = 4.75kg).
The experimental results were also compared to FEM calculations on the displacement of the beams when subject to the same load. Here measurements and calculations showed very good agreement.
Overall the results imply that FBGs show a high potential as a suitable in-situ health monitoring of lightweight fixtures for the aeronautic industry as well as other applications.
Authors
Citation
Strömberg, K., Borgenvall, S., Loukil, M., Noharet, B. et al., "Next Generation Manufacturing Fixtures: CFRP Structures Using “In Situ” Health Monitoring," SAE Technical Paper 2015-01-2619, 2015, https://doi.org/10.4271/2015-01-2619.Also In
References
- Measures , R. M. Fiber optic sensing for composite smart structures Composites Engineering 3 7 8 1993 715 737 739 750
- Maaskant , R. et. al. Fiber optic Nragg Grating Sensors for Bridge Monitoring , Cements and Concrete Composites 19 1997 21 33
- Pran , K. et. al Instrumentation of a high-speed surface effect ship for structural response characterisation during sea trials Proc. SPIE 3986 March 2000 372 379
- Foote PD Fibre Bragg grating strain sensors for aerospace smart structures Proc SPIE 1994 2361 162 166
- Levin , K. Durability of embedded fibre optic sensors in composites Doctoral Thesis, Report 2001-8 0280-4646
- Satori , K. et. al. Development of small-diameter optical fiber sensors for damage detection in composite laminates Proc SPIE 3986 104 June 12 2000
- Polyimide Fiber (OFS BF04446)
- http://www.atgrating.com/en/
- Realization and Characterization of Fiber Bragg Gratings Petermann , I. Thesis 2001 91-7283-213-4
- Fabrication of advanced fiber Bragg gratings by use of sequential writing with a continuous-wave ultraviolet laser source Petermann , I. , Sahlgren , B. , Helmfrid , S. , Friberg , A. T. , and Fonjallaz , P-Y Applied Optics 41 6 1051 2002
- Fiber Bragg Gratings -Fundamentals and Applications in Telecommunications and Sensing Othonos A. and Kalli K. Artech House, Inc. 1999
- https://www.aflglobal.com/Products/Fiber-Optic-Imaging-Energy-and-Sensing/Large-Core-Fiber/Polyimide-coated-fiber.aspx
- http://www.midnightcomposites.com/
- http://aralditeadhesives.com/index.php/adhesives/request-a-tds/101-araldite-aw-4858-hardener-hw-4858-eur-e/file.html
- Kersey , A.D. et. al. Fiber Grating Sensors J. Lightwave Technol. 15 1442 1463 1997
- http://www.ibsenphotonics.com/products/interrogation-monitors/i-mon-usb/i-mon-256-512-usb