PSI - Issue 65

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

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Procedia Structural Integrity 65 (2024) 6–10

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Thermal control. Impact loading of composite materials Akhmetkhanov R. S.* A.A. Blagonravov Institute of Mechanical Engineering. 101990, 4, Maly Kharitonievsky lane, Moscow, Russian Federation. 4, Moscow, Russian Federation, mibsts@mail.ru. The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Thermal control. Impact loading of composite materials Akhmetkhanov R. S.* A.A. Blagonravov Institute of Mechanical Engineering. 101990, 4, Maly Kharitonievsky lane, Moscow, Russian Federation. 4, Moscow, Russian Federation, mibsts@mail.ru. The aim of the work is to develop procedures for analyzing thermograms during impact inspection in order to identify defects in composite material or to assess the level of beyond-design impact. The thermoplastic effect of temperature increase in the area of plastic deformations was used to study the damage process, and fractal analysis was applied to analyze the quantitative and qualitative characteristics of thermograms, which allowed one to identify zones and types of damage by changes in the thermal field, including the possible occurrence of defects under beyond design loads. And application of Minkowski connectivity gives qualitative characterization of arising deformations and stresses, which is supplemented by information of size distribution of zones with similar temperature level. The applied methods of thermogram analysis allow one to evaluate quantitative and qualitative changes in the character of thermal fields. © 2024 Akhmetkhanov R.S., 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 MRDMS 2023 organizers Keywords: Comopositional material, thermograms, defects, statistical characteristics, Minkowski connectivity, multifractal spectra © 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 MRDMS 2023 organizers Abstract Abstract The aim of the work is to develop procedures for analyzing thermograms during impact inspection in order to identify defects in composite material or to assess the level of beyond-design impact. The thermoplastic effect of temperature increase in the area of plastic deformations was used to study the damage process, and fractal analysis was applied to analyze the quantitative and qualitative characteristics of thermograms, which allowed one to identify zones and types of damage by changes in the thermal field, including the possible occurrence of defects under beyond design loads. And application of Minkowski connectivity gives qualitative characterization of arising deformations and stresses, which is supplemented by information of size distribution of zones with similar temperature level. The applied methods of thermogram analysis allow one to evaluate quantitative and qualitative changes in the character of thermal fields. © 2024 Akhmetkhanov R.S., 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 MRDMS 2023 organizers Keywords: Comopositional material, thermograms, defects, statistical characteristics, Minkowski connectivity, multifractal spectra

Nomenclature μ Nomenclature μ D o

Minkowski connectivity Minkowski connectivity fractal dimension

D o f(α) f(α)

fractal dimension multifractal spectrum (singularity spectrum) multifractal spectrum (singularity spectrum)

* Corresponding author. Tel.: +7-910-427-7874. E-mail address: mibsts@mail.ru * Corresponding author. Tel.: +7-910-427-7874. E-mail address: mibsts@mail.ru

2452-3216 © 2024 Akhmetkhanov R.S., 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 MRDMS 2023 organizers 2452-3216 © 2024 Akhmetkhanov R.S., 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 MRDMS 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 MRDMS 2023 organizers 10.1016/j.prostr.2024.11.002