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Sensors 2017, 17(11), 2600; https://doi.org/10.3390/s17112600

Incorporation of Fiber Bragg Sensors for Shape Memory Polyurethanes Characterization

1
Instituto de Telecomunicações, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
2
NRG-Research Group, Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
3
GRIDS-Research Group, Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 3 November 2017 / Accepted: 6 November 2017 / Published: 11 November 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
Full-Text   |   PDF [4286 KB, uploaded 11 November 2017]   |  

Abstract

Shape memory polyurethanes (SMPUs) are thermally activated shape memory materials, which can be used as actuators or sensors in applications including aerospace, aeronautics, automobiles or the biomedical industry. The accurate characterization of the memory effect of these materials is therefore mandatory for the technology’s success. The shape memory characterization is normally accomplished using mechanical testing coupled with a heat source, where a detailed knowledge of the heat cycle and its influence on the material properties is paramount but difficult to monitor. In this work, fiber Bragg grating (FBG) sensors were embedded into SMPU samples aiming to study and characterize its shape memory effect. The samples were obtained by injection molding, and the entire processing cycle was successfully monitored, providing a process global quality signature. Moreover, the integrity and functionality of the FBG sensors were maintained during and after the embedding process, demonstrating the feasibility of the technology chosen for the purpose envisaged. The results of the shape memory effect characterization demonstrate a good correlation between the reflected FBG peak with the temperature and induced strain, proving that this technology is suitable for this particular application. View Full-Text
Keywords: fiber Bragg grating sensors; shape memory polymers; polyurethanes; injection molding fiber Bragg grating sensors; shape memory polymers; polyurethanes; injection molding
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Alberto, N.; Fonseca, M.A.; Neto, V.; Nogueira, R.; Oliveira, M.; Moreira, R. Incorporation of Fiber Bragg Sensors for Shape Memory Polyurethanes Characterization. Sensors 2017, 17, 2600.

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