Title :
Initial studies of glued wood joints using FBG strain sensors
Author :
Fernandes, J.R.A. ; Passos, D.J. ; Xavier, Joao ; Morais, J.J.L. ; Frazao, Orlando
Author_Institution :
INESC Porto, Porto, Portugal
Abstract :
This work addresses the experimental work of characterization of wood (P. pinaster) bonded joints by means of pure mode I using the double cantilever beam (DCB) configuration test. The approach combines fracture mechanical testing with embedded fiber Bragg grating (FBG) sensors in the glue line. A method for the determination of the FBG reflection spectra shift based on the spectral geometric mean determination is used. The load-displacement (P-δ) curve and wavelength-displacement (λ-δ) curve are acquired and related to each other. An quantification of a global internal equivalent uniform strain applied to the FBG was then calculated.
Keywords :
Bragg gratings; beams (structures); cantilevers; fibre optic sensors; fracture mechanics; mechanical testing; strain sensors; wood; FBG strain sensors; P. pinaster; double cantilever beam configuration test; fiber Bragg grating sensors; fracture mechanical testing; global internal equivalent uniform strain; glued wood joints; load-displacement curve; reflection spectra shift; spectral geometric mean determination; wavelength-displacement curve; Fiber gratings; Joints; Optical fiber sensors; Optical fibers; Strain; Fiber Bragg strain sensors; Mode I fracture; Wood bonded joints;
Conference_Titel :
Photonics Conference, 2014 Third Mediterranean
Conference_Location :
Trani
DOI :
10.1109/MePhoCo.2014.6866495
