PSI - Issue 18

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 18 (2019) 129–134

25th International Conference on Fracture and Structural Integrity Analysis of cross-sections of PCM samples with embedded FOSS Natalia Kosheleva a , Grigorii Serovaev a * a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614013, Russia Abstract In this work, experimental studies of the internal structure of woven fabric reinforced fiberglass and carbon fiber composite samples with embedded optical fiber were carried out. It is known that for the unidirectional composites the most significant distortion of the structure of the host material takes place when the optical fiber is embedded perpendicular to the direction of the reinforcement of the composite material layers. However, the internal structure of the composites with woven layer reinforcement scheme is significantly different. And the embedding of such a foreign object as an optical fiber can cause a basically other, as compared to unidirectional composites, change in the internal structure. Cross-sectional studies were performed using an optical microscope. The analysis of cross-sections of PCM samples was carried out with the aim of studying the changes in the structure of the layered composite with woven fabric reinforcement due to the embedding of the fiber-optic sensors. A comparison of the obtained images showed that the microstructure of the studied samples is better seen on polished surfaces. In the absence of polishing on a number of samples, the optical fiber is not visually noticeable or poorly distinguishable. Analysis of the obtained images showed that there is an insignificant distortion of the internal structure of the material in the area with embedded optical fiber without the formation of a resin pocket for all studied GFRP samples. At the same time, when analyzing CFRP samples, the effect of embedding of the optical fiber on the microstructure of the composite was not observed. 25th International Conference on Fracture and Structural Integrity Analysis of cross-sections of PCM samples with embedded FOSS Natalia Kosheleva a , Grigorii Serovaev a * a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614013, Russia Abstract In t is work, xperimental studies of the internal structure of woven fabric reinforced fiberglass and carb n fiber composite samples with embedded optical fiber were carried out. It is kn wn that for th unidirectional composites the most significant distortion of the structure of the host material takes place w n the optical fiber is embedded perpendicular to the directio f the reinforce ent of the composite material lay rs. However, the internal structure of the composites with woven l yer reinforcement scheme is significantly different. And t e embedding of such a foreign object as an optical fiber can cause a basically other, as compared to unidirectional composites, change in the internal structure. Cross-sectional studies were perform d using an optical microscope. The analysis of cr ss-sections of PCM samples was carried out with the aim of studying the changes in the structure of the layered composite with woven fabric reinforcement due to the embedding of the fiber-optic sensors. A comparison of the obtai ed imag s showed that the microstructure f the studied samples is better seen on polish d surfaces. In the abse ce of polishing on a number of samples, the optical fiber is not visually noticeable or poorly distinguish ble. Analysis of the btained images showed that there is an insignificant distortion of the internal structure of the material in the area with embedded optical fiber without the formation f a resin pocket for all studied GFRP samples. At the same time, when analyzing CFRP samples, the effect of embedding of the optical fiber on the microstructure of the composite was not observed.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

Keywords: polymer composite material, fiber-optic strain sensors, microscopic image, microstructure, resin pocket Keywords: polymer composite material, fiber-optic strain sensors, microscopic image, microstructure, resin pocket

1. Introduction With the constant increase in the use of composite materials in industry, the share of so-called “smart materials” is also increasing today. Such materials are equipped with different sensing elements which give them the ability to 1. Introduction With the constant increase in the use of composite materials in industry, the share of so-called “smart materials” is also increasing today. Such materials are equipped with different sensing elements which give them the ability to

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Correspon ing auth r. Tel.: +7(342)-237-83-08; fax: +7 (342)-237-84-87. E-mail address: serovaev@icmm.ru * Corresponding author. Tel.: +7(342)-237-83-08; fax: +7 (342)-237-84-87. E-mail address: serovaev@icmm.ru

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.147