Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate

Tatyana Nizina; Vladimir P. Selyaev; Dmitriy Nizin; Nadezhda Kanaeva; Denis Artamonov

doi:10.52957/27821919_2020_1_27

UDC 691 UDC 620.17

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KINETICS OF DAMAGE ACCUMULATION IN THE STRUCTURE OF EPOXY POLYMERS EXPOSED IN A TEMPERATE CONTINENTAL CLIMATE Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate

АА Аа

Published in Smart composite in construction · Volume 1, Issue 1 · Pages 27–35 · Rubric: Uncategorized

DOI: https://doi.org/10.52957/27821919_2020_1_27

Received: 11.09.2020 Accepted: 12.10.2020 Published: 19.12.2020

Authors

Tatyana Nizina

Vladimir P. Selyaev

Dmitriy Nizin

Nadezhda Kanaeva

et al.

Denis Artamonov

Tatyana Nizina

Academic degree: doctor of technical sciences

Science rang: professor

Ogarev Mordovia State University Director of the Institute of Architecture and Construction · Saransk

Vladimir P. Selyaev

Academic degree: doctor of technical sciences

Science rang: academician author.academy_titles.34 ; professor

Ogarev Mordovia State University Zaveduyuschiy kafedroy · Kafedra stroitel'nyh konstrukciy · Saransk

Dmitriy Nizin

Academic degree: graduate student of technical sciences

Nacional'nyy issledovatel'skiy Mordovskiy gosudarstvennyy universitet im. N.P. Ogareva Russian Federation · Саранск

Nadezhda Kanaeva

Ogarev Mordovia State University Saransk

Denis Artamonov

Academic degree: graduate student of technical sciences

Nacional'nyy issledovatel'skiy Mordovskiy gosudarstvennyy universitet im. N.P. Ogareva Russian Federation · Саранск

ABSTRACT

The study deals with the kinetics of damage accumulation during exposure in a temperate climate. The research uses two types of polymer composites of significantly different climatic resistance as an example. The proposed method is the analysis of changes in the fractality index determined by the least-coverage method by tensile strain curves recorded with a high reading frequency (0.01 sec.). The fractality indices were calculated by analyzing the preceding time section that corresponds to 16 (24) experimental points, i.e., 0.16 sec. The levels of "critical" states corresponded to the minimum values of fractality indices ranged for the studied deformation curves from the beginning of loading to the level of reaching maximum tensile stresses by the specimens. The study included a field experiment on climatic aging of the studied polymers for one calendar year. We have recorded the changes in the elastic-strength characteristics of the samples after 45, 90, 180, 270 and 360 days. The results of the study showed significant differences in the damage accumulation kinetics of epoxy polymers impacted by tensile stresses, including those depending on the type of epoxy resin and hardener, as well as the duration of full-scale exposure. It was found that for climatically unstable compositions after just 180 days of climatic there is a grouping of "critical" points into ensembles similar in time, stress level, and relative elongation after stretching. At the same time, the climatic resistant polymers have a more uniform distribution of "critical" points along the deformation curves, which obviously allows them to successfully redistribute the occurring overstresses onto the workable structural elements and, consequently, to accept significantly higher levels of tensile loads and relative deformations.

KEYWORDS

epoksidnye polimery, krivye deformacii, nakoplenie povrezhdeniy, fraktal'nyy analiz, metod minimal'nogo pokrytiya

Funding

This work was supported by the RFBR grant No. 18-08-01050

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GOST

Nizina T. A., Selyaev V. P., Nizin D. R., Kanaeva N. S., Artamonov D. A. Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate // Smart composite in construction. 2024. no. 1. pp. 27-35. DOI: https://doi.org/10.52957/27821919_2020_1_27. (Date of access 26.10.2026).

MLA

Tatyana Nizina, Selyaev V. P., Nizin D. R., Kanaeva N. S., Artamonov D. A.. "Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate." Smart composite in construction 1.1 (2024): 27-35. DOI: https://doi.org/10.52957/27821919_2020_1_27.

APA

Nizina T. A., Selyaev V. P., Nizin D. R., Kanaeva N. S., Artamonov D. A. (2024). Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate. Smart composite in construction, 1(1), 27-35. https://doi.org/10.52957/27821919_2020_1_27

Chicago

Tatyana Nizina, Selyaev V. P., Nizin D. R., Kanaeva N. S., Artamonov D. A.. "Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate." Smart composite in construction 1, no. 1 (2024): 27-35. https://doi.org/10.52957/27821919_2020_1_27.

WIKI

{{cite journal | author = Nizina T. A., Selyaev V. P., Nizin D. R., Kanaeva N. S., Artamonov D. A. | title = Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate | journal = Smart composite in construction | year = 2024 | volume = 1 | issue = 1 | pages = 27-35 | doi = 10.52957/27821919_2020_1_27 }}

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KINETICS OF DAMAGE ACCUMULATION IN THE STRUCTURE OF EPOXY POLYMERS EXPOSED IN A TEMPERATE CONTINENTAL CLIMATE Kinetics of damage accumulation in the structure of epoxy polymers exposed in a temperate continental climate

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