PSI - Issue 65

ScienceDirect 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 Available online at www.sciencedirect.com

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

Procedia Structural Integrity 65 (2024) 1–5

The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Thermal control. Point heating of composite materials Akhmetkhanov R. S.* A.A. Blagonravov Institute of Mechanical Engineering. 101990, 4, Maly Kharitonievsky lane, Moscow, Russian Federation The purpose of this work is to develop procedures for processing thermograms during precise heating of composite material in order to detect defects or during thermal monitoring of technical products under beyond-design effects that may lead to defect formation. To study the damage process, the effect of distortion of the induced thermal field in areas with defects or changes in the mechanical properties of the material was used. Fractal analysis was used to analyze quantitative and qualitative characteristics of thermograms, which made it possible 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 The 17th International Conference on MECHANICS, RESOURCE AND DIAGNOSTICS OF MATERIALS AND STRUCTURES (MRDMS 2023) Thermal control. Point heating of composite materials Akhmetkhanov R. S.* A.A. Blagonravov Institute of Mechanical Engineering. 101990, 4, Maly Kharitonievsky lane, Moscow, Russian Federation Abstract The purpose of this work is to develop procedures for processing thermograms during precise heating of composite material in order to detect defects or during thermal monitoring of technical products under beyond-design effects that may lead to defect formation. To study the damage process, the effect of distortion of the induced thermal field in areas with defects or changes in the mechanical properties of the material was used. Fractal analysis was used to analyze quantitative and qualitative characteristics of thermograms, which made it possible 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

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.2024.11.001