PSI - Issue 54

V.P. Matveenko et al. / Procedia Structural Integrity 54 (2024) 218–224

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Matveenko V.P., Serovaev G.S., Kosheleva N.A., Galkina E.B../ Structural Integrity Procedia 00 (2023) 000 – 000

Fig. 2. The scheme of the sample.

3. FBG spectrum registration Samples conforming to Design 3 were fabricated from PLA plastic using the Fused Deposition Modeling (FDM) method with Picaso Designer XL PRO Series2 3D printer. Optical fibers with FBGs of different lengths were attached to the surface of the manufactured samples using cyanoacrylate glue, so that the FBG is aligned in the zone of the biggest strain gradient. The samples were subjected to multi-stage loading using suspended weights of different magnitudes. Registration of reflected FBG spectra was made by HYPERION si255 interrogator. The reflected spectrum shapes corresponding to various load levels for the FBGs under consideration are depicted in Fig. 3.

Fig. 3. Reflected spectra for studied FBGs of different lengths under various load levels.

Since the most substantial strain difference occurs along the FBG with a length of 15 mm, it was expected that this sensor's spectrum shape would exhibit the most significant change. However, experimental results demonstrated a