Abstract
We demonstrate shear stress sensing with a Bragg grating-based microstructured optical fiber sensor embedded in a single lap adhesive joint. We achieved an unprecedented shear stress sensitivity of 59.8 pm/MPa when the joint is loaded in tension. This corresponds to a shear strain sensitivity of 0.01 pm/µε. We verified these results with 2D and 3D finite element modeling. A comparative FEM study with conventional highly birefringent side-hole and bow-tie fibers shows that our dedicated fiber design yields a fourfold sensitivity improvement.
Highlights
The wide adoption of smart materials and structural health monitoring in domains such as material manufacturing, civil engineering, transport, energy production and healthcare stimulates the demand for reliable and dedicated sensors
We demonstrate shear stress sensing with a Bragg grating-based microstructured optical fiber sensor embedded in a single lap adhesive joint
We carry out experiments on fiber Bragg grating (FBG) sensors embedded in single lap adhesive joint (SLJ) that are loaded in tension up to failure and 2D and 3D structural finite element (FEM) analyses of an optical fiber embedded in a SLJ to compute and verify the sensor response
Summary
The wide adoption of smart materials and structural health monitoring in domains such as material manufacturing, civil engineering, transport, energy production and healthcare stimulates the demand for reliable and dedicated sensors. A first technique, demonstrated by Tjin et al [27], uses a FBG in a conventional single mode fiber (SMF) that is embedded under a small tilt angle in a deformable layer Shear loading of this layer induces an axial strain to the fiber, which can be derived from the Bragg peak wavelength shift. By exploiting stress induced changes of the modal birefringence of a highly birefringent MOF, temperature insensitive pressure and transverse strain FBG sensors have been demonstrated [34,35]. We successfully demonstrate shear strain sensing by embedding the butterfly MOF-FBG in the adhesive layer of a single lap adhesive joint (SLJ).
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