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2 May 2014 Fiber Bragg grating-based shear strain sensors for adhesive bond monitoring
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The application of shear stress sensors in structural health monitoring remains limited because current sensors are either difficult to implement, they feature a low measurement resolution or the interrogation of the output signal is complex. We propose to use fiber Bragg grating-based sensors fabricated in dedicated highly birefringent microstructured optical fibers. When embedded in a host material, the orientation angle of the fiber should be chosen such that their polarization axes are aligned parallel with the direction of maximum shear stress when the host is mechanically loaded. We present experimental results of sensors embedded in the adhesive layer of single lap and double lap structural joints. These tests demonstrate that when the joints are tension loaded, the embedded sensors have a shear stress sensitivity of around 60 pm/MPa. We study the influence of the adhesive material on the sensor response, as well as the influence of sensor orientation and location in the bond line. Finally, we demonstrate the minimal thermal cross-sensitivity of the shear stress sensitivity of this sensor.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sanne Sulejmani, Camille Sonnenfeld, Thomas Geernaert, Danny Van Hemelrijck, Geert Luyckx, Pawel Mergo, Waclaw Urbanczyk, Karima Chah, Christophe Caucheteur, Patrice Mégret, Hugo Thienpont, and Francis Berghmans "Fiber Bragg grating-based shear strain sensors for adhesive bond monitoring", Proc. SPIE 9128, Micro-structured and Specialty Optical Fibres III, 91280D (2 May 2014);

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