PSI - Issue 59

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 59 (2024) 344–351

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract The study aimed to the development of signs of the presence of local damage of cantilever beams made of polymer composite materials based on the analysis of dissipative properties change. The study aims to investigate the influence of local damage on the damping capacity of T300 carbon fiber-reinforced plastic (CFRP) composite materials. The research methodology involves predetermined damage to woven CFRP beam specimens using quasi-static punching with a spherical puncher and the analysis of hysteresis losses of vibration energy. The acoustic emission signals are used to determine the extent of local damage. The effect of local damage on nonlinear or amplitude-dependent energy dissipation is considered. The results of the experimental investigations provide insights into the changes in natural frequency and amplitude-dependent energy dissipation due to local damage in cantilever composite beams made of twill CFRP. It is established that changes in the vibration decrement serve as a more sensitive vibrodiagnostic indicator of the presence of local damage in the CFRP composite beam compared to changes in its natural frequency of vibration. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: composite material; damage; vibration damping; acoustic emission; natural frequency; vibrational diagnostic; acoustic emission. 1. Introduction and problem statement The increasing use of polymer composite materials in the structural elements of modern technology, subjected to intense dynamic loads, has led to the necessity of developing effective non-destructive methods for structural health VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Experimental techniques for studying the effect of local damage on damping properties of CFRP cantilever beams Valerii Kobzar, Oleh Derkach* G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine, Kyiv 01014, Ukraine Abstract The study aimed to the development of signs of the presence of local damage of cantilever beams made of polymer composite materials based on the analysis of dissipative properties change. The study aims to investigate the influence of local damage on the damping capacity of T300 carbon fiber-reinforced plastic (CFRP) composite materials. The research methodology involves predetermined damage to woven CFRP beam specimens using quasi-static punching with a spherical puncher and the analysis of hysteresis losses of vibration energy. The acoustic emission signals are used to determine the extent of local damage. The effect of local damage on nonlinear or amplitude-dependent energy dissipation is considered. The results of the experimental investigations provide insights into the changes in natural frequency and amplitude-dependent energy dissipation due to local damage in cantilever composite beams made of twill CFRP. It is established that changes in the vibration decrement serve as a more sensitive vibrodiagnostic indicator of the presence of local damage in the CFRP composite beam compared to changes in its natural frequency of vibration. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Keywords: composite material; damage; vibration damping; acoustic emission; natural frequency; vibrational diagnostic; acoustic emission. 1. Introduction and problem statement The increasing use of polymer composite materials in the structural elements of modern technology, subjected to intense dynamic loads, has led to the necessity of developing effective non-destructive methods for structural health VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Experimental techniques for studying the effect of local damage on damping properties of CFRP cantilever beams Valerii Kobzar, Oleh Derkach* G.S. Pisarenko Institute for Problems of Strength of the NAS of Ukraine, Kyiv 01014, Ukraine

* Corresponding author. Tel.: +38044 286-49-57; fax: +3-8044-286-16-84. E-mail address: derkach@ipp.kiev.ua * Corresponding author. Tel.: +38044 286-49-57; fax: +3-8044-286-16-84. E-mail address: derkach@ipp.kiev.ua

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.049