PSI - Issue 42

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Valerii Matveenko et al. / Procedia Structural Integrity 42 (2022) 307–314 V.Matveenko, N.Kosheleva, G.Serovaev / Structural Integrity Procedia 00 (2022) 000 – 000

Fig. 7. Strain (a) and temperature (b) surface distributions in the sample during the manufacturing process, measured by embedded DFOS

DFOS recorded the behavior of the material similar to the point FOSs during the printing process and after its completion, allowing to estimate the non-uniform distribution of these parameters with high spatial resolution. The obtained results demonstrate the operability of fiber-optic sensors based on Bragg gratings and distributed fiber-optic sensors based on Rayleigh scattering embedded in samples manufactured using additive technologies. 4. Conclusions The paper demonstrates the possibility of using two types of embedded fiber-optic sensors (point and distributed) to register data on the mechanical state of the structure during its manufacture. The structure is made by FDM method using a 3D printer. Data on temperature and strains occurring in the sample during the manufacturing process have been recorded since the fiber-optic sensors were embedded. Experimental demonstration of strain and temperature measurements using embedded fiber-optic sensors was carried out on the uniform strength beam. The change of strains during and after the printing of the sample was recorded. It is shown that the main process of formation of technological strains begins after the end of the printing process. Data are presented that allow to monitor the temperature distribution along the sample during the fabrication process, measured by an embedded distributed fiber-optic temperature sensor. The obtained data demonstrate the operability and reliability of point fiber-optic sensors based on Bragg gratings and distributed fiber optic sensors based on Rayleigh scattering embedded in samples made using additive technologies. References Chen, R. et al. 2021. Monitoring the strain and stress in FDM printed lamellae by using Fiber Bragg Grating sensors, Polymer Testing , 93, p. 106944. doi: 10.1016/j.polymertesting.2020.106944. Hong, C. et al. 2019. A simple FBG pressure sensor fabricated using fused deposition modelling process, Sensors and Actuators A: Physical , 285, pp. 269 – 274. doi: 10.1016/j.sna.2018.11.024. Kousiatza, C. and Karalekas, D. 2016. In-situ monitoring of strain and temperature distributions during fused deposition modeling process, Materials & Design , 97, pp. 400 – 406. doi: 10.1016/j.matdes.2016.02.099. Lee, J.-Y., An, J. and Chua, C. K. 2017. Fundamentals and applications of 3D printing for novel materials, Applied Materials Today , 7, pp. 120 – 133. doi: 10.1016/j.apmt.2017.02.004. Liu, R. et al. 2017. Aerospace applications of laser additive manufacturing, in Laser Additive Manufacturing . Elsevier, pp. 351 – 371. doi: 10.1016/B978-0-08-100433-3.00013-0. Luna Technologies Inc. 2013. Optical Backscatter Reflectometer 4600 User Guide, p. 227. Mao, J. et al. 2016. A Monitoring Method Based on FBG for Concrete Corrosion Cracking, Sensors , 16(7), p. 1093. doi: 10.3390/s16071093. Matveenko, V. P. et al. 2018. Temperature and strain registration by fibre-optic strain sensor in the polymer composite materials manufacturing,