Проблемы прочности и пластичности

1814-9146

10.32326/1814-9146-2026-88-2-109-122

Other

ИССЛЕДОВАНИЕ ОСТАТОЧНЫХ МЕХАНИЧЕСКИХ СВОЙСТВ ПОЛИМЕРНОГО СЛОИСТОГО КОМПОЗИТА ПОСЛЕ НАНЕСЕНИЯ ВМЯТИН РАЗНЫХ РАЗМЕРОВ

STUDY OF RESIDUAL MECHANICAL PROPERTIES OF POLYMER LAMINATED COMPOSITE AFTER APPLYING INDENTATIONS OF DIFFERENT SIZES

Чеботарева

Е.А.

Chebotareva

E.A.

m.chebotareva@mail.ru

Лобанов

Д.С.

Lobanov

D.S.

Мельникова

В.А.

Melnikova

V.A.

Center of Experimental Mechanics of Perm National Research Polytechnic University (Perm, Russian Federation)Центр экспериментальной механики Пермского национального исследовательского политехнического университета (Пермь, Российская Федерация)

30062026

882109122https://creativecommons.org/licenses/by/4.0/

CC BY 4.0

http://ppp.mech.unn.ru/index.php/ppp/article/view/952

Представлены результаты комплексного исследования влияния наружных дефектов различной величины на механические характеристики и процессы разрушения полимерного композиционного материала. Экспериментальные исследования проводились на образцах с искусственно нанесенными дефектами-вмятинами при фиксированной нагрузке с использованием инденторов разного диаметра. После нанесения дефектов образцы были испытаны на квазистатическое одноосное растяжение. Проведен анализ типов разрушения образцов, согласно нормативной документации, установлено влияние величины дефекта на прочностные характеристики материала. В процессе исследований использованы трехмерная видеосистема и система регистрации акустической эмиссии. Проведен анализ механизмов разрушения материала на основе сигналов акустической эмиссии. Анализ включал в себя как характеристики энергетического параметра и пиковых частот, так и параметры формы сигнала с учетом времени нарастания, длительности и амплитуды сигналов. Выявлены закономерности в результатах, полученных при регистрации сигналов акустической эмиссии, включая три характерных диапазона частот сигналов акустической эмиссии, связанных с различными типами повреждений материала и их сменами в зависимости от величины предварительно нанесенного дефекта. Проведены оценки жесткости материала при нагрузке, а также локализации напряжений у образцов с поверхностными дефектами. Метод корреляции цифровых изображений позволил изучить эволюцию неоднородных полей деформаций на поверхности образцов. Исследование позволило установить закономерности влияния наружных дефектов на прочностные характеристики и механизмы разрушения полимерного композиционного материала, что имеет значение для оценки работоспособности композитных конструкций при наличии поверхностных повреждений.

The paper presents the results of a comprehensive study of the influence of external defects of various sizes on the mechanical characteristics and fracture processes of a polymer composite material. Experimental research was conducted on samples with artificially introduced indentation defects under fixed load using indenters of different diameters. After defect introduction, the samples were tested for quasi-static uniaxial tension. An analysis of sample fracture types was performed, and according to regulatory documentation, the impact of defect size on the material's strength characteristics was established. During the research, a three-dimensional video system and an acoustic emission (AE) recording system were utilized. An analysis of material fracture mechanisms was conducted based on acoustic emission signals. The analysis included both characteristics of the energy parameter and peak frequencies, as well as signal shape parameters based on signal rise time, duration, and amplitude. Regularities were identified in the data obtained during AE signal registration. Three characteristic frequency ranges of AE signals were revealed, associated with different types of material damage and their changes depending on the size of the pre-introduced defect. The material stiffness under load was evaluated, as well as stress localization in samples with surface defects. The digital image correlation method allowed studying the evolution of non-uniform deformation fields on the sample surface. The research established regularities in the influence of external defects on the strength characteristics and fracture mechanisms of the polymer composite material, which is significant for assessing the performance of composite structures in the presence of surface damage.

экспериментальная механикаакустическая эмиссияпараметрический анализкомпозиционные материалыметод цифровой корреляции изображений

experimental mechanicsacoustic emissionparametric analysiscomposite materialsdigital image correlation

Выполнено за счет гранта РНФ №25-29-00188 (https://rscf.ru/project/25-29-00188/).

The study was supported by the grant of the Russian Science Foundation No 25-29-00188 (https://rscf.ru/project/25-29-00188/).

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