Initial studies of glued wood joints using FBG strain sensors

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-) curve and wavelengthdisplacement ( -) curve are acquired and related to each other. An quantification of a global internal equivalent uniform strain applied to the FBG was then calculated. Index Terms-Wood bonded joints, Mode I fracture, Fiber Bragg strain sensors.