PSI - Issue 41

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

Procedia Structural Integrity 41 (2022) 759–765

© 2022 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 the MedFract2Guest Editors. The dependences of the resonant frequency of specimens from the value of fatigue life are obtained. From the dependences obtained, it can be seen that with the accumulation of damage in the sample, the resonant frequency can abruptly decrease, and each decrease corresponds either to the appearance of a new macroscopic crack or its growth. The dependences of the number of acoustic emission events on time were also obtained. According to the dependencies obtained, each abrupt decrease in the resonant frequency of tests corresponds to an increase in the number of acoustic emission events. The appearance of delamination in the composite structure is accompanied by a local increase in temperature and strain. The obtained experimental data are supposed to be used to create fatigue damage models for layered polymer composite materials. To determine the dynamic deformation fields, the digital image correlation (DIC) method implemented in the VIC-3D (Correlated solutions) experimental setup was used. Acoustic emission signals were recorded using an AMSY-6 system and two AE204A piezoelectric sensors, and the thermal state of the sample was assessed using an NEC TH9100 WR Pro New infrared camera. The dependences of the resonant frequency of specimens from the value of fatigue life are obtained. From the dependences obtained, it can be seen that with the accumulation of damage in the sample, the resonant frequency can abruptly decrease, and each decrease corresponds either to the appearance of a new macroscopic crack or its growth. The dependences of the number of acoustic emission events on time were also obtained. According to the dependencies obtained, each abrupt decrease in the resonant frequency of tests corresponds to an increase in the number of acoustic emission events. The appearance of delamination in the composite structure is accompanied by a local increase in temperature and strain. The obtained experimental data are supposed to be used to create fatigue damage models for layered polymer composite materials. 2nd Mediterranean Conference on Fracture and Structural Integrity Some effects accompanying delamination of CFRP under cyclic tension Nikhamkin M.Sh. a *, Balakirev A.A. a , Sazhenkov N.A. a , Semenov S.V. a , Solomonov D.G. a , Gladkiy I.L b a Perm National Research Polytechnic University, Professora Pozdeeva st. 13, Perm, 614000, Russia b JSC «UEC-Aviadvigatel», Perm, 614000, Russia Abstract The article presents the results of an experimental study of the processes of fatigue failure of layered carbon fiber reinforced plastics. The study was carried out on samples with a cross section of 15x25 mm subjected to cyclic tension with a maximum operating time of up to 1 million loading cycles. For loading the samples, a resonant testing machine was used - a high-frequency pulsator Zwick HFP 5100. During the operation the elastic system "machine-sample" is in resonance mode under the action of a variable load of constant amplitude. To determine the dynamic deformation fields, the digital image correlation (DIC) method implemented in the VIC-3D (Correlated solutions) experimental setup was used. Acoustic emission signals were recorded using an AMSY-6 system and two AE204A piezoelectric sensors, and the thermal state of the sample was assessed using an NEC TH9100 WR Pro New infrared camera. 2nd Mediterranean Conference on Fracture and Structural Integrity Some effects accompanying delamination of CFRP under cyclic tension Nikhamkin M.Sh. a *, Balakirev A.A. a , Sazhenkov N.A. a , Semenov S.V. a , Solomonov D.G. a , Gladkiy I.L b a Perm National Research Po ytechnic University, Professor Pozdeeva st. 13, Perm, 614000, Russia b JSC «UEC-Aviadvigatel», Perm, 614000, Russia Abstract The article presents the results of an experimental study of the processes of fatigue failure of layered carbon fiber reinforced plastics. The study was carried out on samples with a cross section of 15x25 mm subjected to cyclic tension with a maximum operating time of up to 1 million loading cycles. For loading the samples, a resonant testing machine was used - a high-frequency pulsator Zwick HFP 5100. During the operation the elastic system "machine-sample" is in resonance mode under the action of a variable load of constant amplitude.

* Corresponding author. Tel.: +7-902-642-5046. E-mail address: 1st.leonao@gmail.com * Corresponding author. Tel.: +7-902-642-5046. E-mail address: 1st.leonao@gmail.com

2452-3216 © 2022 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 the MedFract2Guest Editors. 2452-3216 © 2022 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 the MedFract2Guest Editors.

2452-3216 © 2022 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 the MedFract2Guest Editors. 10.1016/j.prostr.2022.05.088