PSI - Issue 41

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Procedia Structural Integrity 41 (2022) 550–556

2nd Mediterranean Conference on Fracture and Structural Integrity Technique for obtaining an integral characteristic of the structure of a loaded composite material based on microtomographic research data Ignatova A.M. a * , Balakhnin A.N. a,b , Bannikov M.V. a , Kuper K.E. c , Nikitiuk A.S. a , Naimark O.B. a 2nd Mediterranean Conference on Fracture and Structural Integrity Technique for obtaining an integral characteristic of the struct re f a loaded composite material ba ed n microtomographic res arch d ta Ignatova A.M. a * , Balakhnin A.N. a,b , Bannikov M.V. a , Kuper K.E. c , Nikitiuk A.S. a , Naimark O.B. a

a Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Akademika Koroleva Street, Perm 614013, Russia b Perm National Research Polytechnic University, 29 Komsomolsky Prospect , Perm 614990, Russia c Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, 11, Acad. Lavrentieva Pr. Novosibirsk 630090, Russia a Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences, 1 Akademika Koroleva Street, Perm 614013, Russia b Perm National Research Polytechnic University, 29 Komsomolsky Pro pect , Perm 614990, Russia c Budker Institute of Nuclear Physics, Sibe ian Branch, Russian Academy of Sciences, 11, Acad. Lavrentie a Pr. Novosibirsk 630090, Russia

Abstract Composite materials are characterized by an uneven distribution of the density value in the volume. Under mechanical loading, the parameters of the density distribution over the volume change, which leads to qualitative changes in the structure up to the formation of discontinuities, and the shock-wave sensitivity also changes accordingly. The exact distribution of regions with different density values in the bulk of the material is established by means of X-ray microtomography. The purpose of the work was to develop a technique for obtaining an integral characteristic of the structure of a loaded composite material based on microtomographic examination data. Samples of a carbon composite material in the initial state and subjected to loading with various degrees of deformation were used as objects of study. Synchrotron radiation from a VEPP-3 charged particle accelerator (Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia) was used as an X-ray source for microtomographic studies. To extract the indicated integral characteristic of the structure from the density matrices of the material, an image analysis technique was developed based on sequential image filtering in order to select regions with a given range of gray shades from the total matrix. To decompose the general matrix into derivatives and their subsequent analysis, the universal software ImageJ-FiJi was used. Abstract Composite materials are characterized by an uneven distribution of the density value in the volume. Under mechanical loading, the parameters of the density distribution over the volume change, which leads to qualitative changes in the structure up to the formation of discontinuities, and the shock-wave sensitivity also changes accordingly. The exact distribution of regions with different density values in the bulk of the material is established by means of X-ray microtomography. The purpose of the work was to develop a technique for obtaining an integral characteristic of the structure of a loaded composite material based on microtomographic examination data. Samples of a carbon composite material in the initial state and subjected to loading with various degrees of deformation were used as objects of study. Synchrotron radiation from a VEPP-3 charged particle accelerator (Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia) was used as an X-ray source for microtomographic studies. To extract the indicated integral characteristic of the structure from the density matrices of the material, an image analysis technique was developed based on sequential image filtering in order to select regions with a given range of gray shades from the total matrix. To decompose the general matrix into derivatives and their subsequent analysis, the universal software ImageJ-FiJi was used.

* Corresponding author. E-mail address: iampstu@gmail.com * Corresponding author. E-mail address: iampstu@gmail.com

2452-3216 © 2022 Ignatova A.M., Balakhnin A.N., Bannikov M.V., Kuper K.E., Nikitiuk A.S., Naimark O.B. 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 Ignatova A.M., Balakhnin A.N., Bannikov M.V., Kuper K.E., Nikitiuk A.S., Naimark O.B. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC- D lice se ( 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.2022.05.063