zldmЗаводская лаборатория. Диагностика материаловIndustrial laboratory. Diagnostics of materials1028-68612588-0187ООО «Издательство «ТЕСТ-ЗЛ»10.26896/1028-6861-2023-89-1-46-55zldm-1833Research ArticleИССЛЕДОВАНИЕ СТРУКТУРЫ И СВОЙСТВ. МЕХАНИКА МАТЕРИАЛОВ: ПРОЧНОСТЬ, РЕСУРС, БЕЗОПАСНОСТЬTESTING OF STRUCTURE AND PARAMETERS. MECHANICAL TESTING METHODSОптический метод оценки деградации свойств полимерных композитов, армированных углеродными волокнами, при циклическом нагруженииOptical strain measurement technique for estimating degradation of the properties of carbon fiber reinforced polymer composites under cyclic loadingПанинС. В.PaninS. V.

Панин Сергей Викторович.

634055, Томск, проси. Академический, д. 2/4; 634050, Томск, проси. Ленина, д. 30

Sergey V. Panin.

2/4, Akademicheskii prosp., Tomsk, 634055; 30, prosp. Lenina, Tomsk, 634050

svp@lspms.ruБогдановА. А.BogdanovA. A.

Богданов Алексей Алексеевич.

634055, Томск, проси. Академический, д. 2/4; 634050, Томск, проси. Ленина, д. 30

Alexey A. Bogdanov.

2/4, Akademicheskii prosp., Tomsk, 634055; 30, prosp. Lenina, Tomsk, 634050

ЛюбутинП. С.LyubutinP. S.

Любутин Павел Степанович.

634055, Томск, проси. Академический, д. 2/4

Pavel S. Lyubutin.

2/4, Akademicheskii prosp., Tomsk, 634055

ЕреминА. В.EreminA. V.

Еремин Александр Вячеславович.

634055, Томск, проси. Академический, д. 2/4; 634050, Томск, проси. Ленина, д. 30

Alexander V. Eremin.

2/4, Akademicheskii prosp., Tomsk, 634055; 30, prosp. Lenina, Tomsk, 634050

БусловичД. Г.BuslovichD. G.

Буслович Дмитрий Геннадьевич.

634055, Томск, проси. Академический, д. 2/4

Dmitry G. Buslovich.

2/4, Akademicheskii prosp., Tomsk, 634055

БяковА. В.ByakovA. V.

Бяков Антон Викторович.

634055, Томск, проси. Академический, д. 2/4

Anton V. Byakov.

2/4, Akademicheskii prosp., Tomsk, 634055

ШилькоИ. С.Shil’koI. S.

Шилько Иван Сергеевич.

246050, Гомель, ул. Кирова, д. 32, а

Ivan S. Shil’ko.

32a, ul. Kirova, Gomel, 246050

Институт физики прочности и материаловедения СО РАН; Национальный исследовательский Томский политехнический университетРоссияInstitute of Strength Physics and Materials SB RAS; National Research Tomsk Polytechnic UniversityRussian FederationИнститут физики прочности и материаловедения СО РАНРоссияInstitute of Strength Physics and Materials SB RASRussian FederationИнститут механики металлополимерных систем им. В.А. Белого НАН БеларусиБеларусьMetal-Polymer Research Institute of National Academy of Sciences of BelarusBelarus2023210120238914655Copyright © Панин С.В., Богданов А.А., Любутин П.С., Еремин А.В., Буслович Д.Г., Бяков А.В., Шилько И.С., 20232023Панин С.В., Богданов А.А., Любутин П.С., Еремин А.В., Буслович Д.Г., Бяков А.В., Шилько И.С.Panin S.V., Bogdanov A.A., Lyubutin P.S., Eremin A.V., Buslovich D.G., Byakov A.V., Shil’ko I.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.zldm.ru/jour/article/view/1833

Цель работы — изучение процесса усталости в композитах на основе полиимида, армированных коротким углеродным волокном. Для этого использованы параметры петель механического гистерезиса, такие как площадь петли, секущий и динамический модули, установленные в ходе циклических испытаний. Петли гистерезиса получены посредством разработанного аппаратно-программного комплекса, в основе которого лежит оптический метод определения деформации на основе корреляции цифровых изображений (DIC). Описаны методики расчета модулей и параметров петель механического гистерезиса. Представлены результаты их оценки, а также экспериментальные данные по усталостному поведению композитов на основе полиимида, армированных короткими углеродными волокнами. Показано, что важной количественной мерой, отражающей различия в усталостном поведении исследованных композитов, является величина потерь энергии на гистерезис. Для композита с карбонизированными волокнами потери за цикл составили 35 кДж/м3, тогда как для композита с графитизированными волокнами — 23 кДж/м3, что на 34 % меньше. При этом долговечность последнего была в ~40 раз ниже. В ходе циклических испытаний наблюдалось снижение как секущего модуля (до 11 %), так и динамического модуля (до 3,5 %). У композита с карбонизированными волокнами, обладающего большей долговечностью, снижение было в два раза больше. Таким образом, оценка петель механического гистерезиса по параметрам секущего и динамического модулей, а также площади, получаемая методом DIC, может быть эффективно использована для интерпретации отличия усталостных характеристик на стадии накопления рассеянных повреждений. Однако это не позволяет однозначно прогнозировать остаточную долговечность. Решение данной задачи требует проведения дальнейших системных исследований с использованием подходов механики разрушения.

The goal of the study is the fatigue process in polyimide-based composites reinforced with short carbon fibers. Parameters of mechanical hysteresis loops such as the loop area, secant and dynamic moduli were used in the study. Hysteresis loops were constructed using the developed hardware and software system based on the optical method of strain measurements using a digital image correlation (DIC) technique. Methods for calculating the moduli and the parameters of mechanical hysteresis loops is considered. The results of their evaluation and the experimental data on the fatigue behavior of polyimide-based composites reinforced with short carbon fibers are presented. It is shown that an important quantitative measure of the differences in the fatigue behavior of the studied composites is the hysteresis induced energy loss. For a composite with carbonized fibers, the energy loss level per cycle is 35 kJ/m3, whereas for a composite with graphitized fibers it is 34% lower (23 kJ/m3). At the same time, the fatigue durability of the latter is - 40 times lower. A decrease both in the secant modulus (up to 11%) and the dynamic modulus (up to 3.5%) was observed in cyclic tests. However, the reduction was twice as much in a composite with carbonized fibers possessing a longer durability. Thus, the DIC-based estimation of mechanical hysteresis loops by the parameters of the secant and dynamic moduli, as well as the loop area can be successfully used to interpret the difference in the fatigue characteristics at the stage of scattered damage accumulation, whereas an unambiguous prediction of the residual life appeared impossible. The problem requires further systematic studying using approaches of the fracture mechanics.

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The authors declare that there are no conflicts of interest present.