X-RAY COMPUTED TOMOGRAPHY CHARACTERIZATION OF 3D-PRINTED ACRYLONITRILE BUTADIENE STYRENE AND POLYETHERETHERKETONE COMPOSITES SUBJECTED TO LASER SHOCK PEENING

V.A. Mubassarova, I.A. Panteleev, O.A. Plekhov, A.Yu. Iziumova, A.N. Vshivkov, I.V. Vindokurov, M.A. Tashkinov

Author details

V.A. Mubassarova
Institute of Continuous Media Mechanics of the UB of RAS – branch of Perm Federal Research Center of the UB of RAS, Perm, Russian Federation
I.A. Panteleev
Institute of Continuous Media Mechanics of the UB of RAS – branch of Perm Federal Research Center of the UB of RAS, Perm, Russian Federation
O.A. Plekhov
Institute of Continuous Media Mechanics of the UB of RAS – branch of Perm Federal Research Center of the UB of RAS, Perm, Russian Federation
A.Yu. Iziumova
Institute of Continuous Media Mechanics of the UB of RAS – branch of Perm Federal Research Center of the UB of RAS, Perm, Russian Federation
A.N. Vshivkov
Institute of Continuous Media Mechanics of the UB of RAS – branch of Perm Federal Research Center of the UB of RAS, Perm, Russian Federation
I.V. Vindokurov
Perm National Research Polytechnic University, Perm, Russian Federation
M.A. Tashkinov
Perm National Research Polytechnic University, Perm, Russian Federation

https://doi.org/10.15593/perm.mech/2023.6.08

The paper deals with X-ray computed tomography results of a polyetheretherketone (PEEK) and a short carbon fibre reinforced by acrylonitrile butadiene styrene (ABS+CF). Individual carbon fibres and 3D printing defects (consolidated structures of interconnected fibres and densified resin clumps) are detected on an initial microstructure of the ABS+CF composite. The carbon fibres and the consolidated structures are densely packed with uniform sub-horizontal locations throughout in a sample volume. In the PEEK samples, the process-induced defects during the composite manufacturing process are visualised as tubular structures of a densified resin with internal voids. Significant changes in the structure of both composites are observed after five times pulsed laser shock peening. In case of a single pulse exposure and a surface treatment, no microstructural changes occur. In a test mode without a protective layer, a material evaporation to a depth of 0.3 mm and a structural degradation of the PEEK samples takes place, while the process-induced interlayer voids do not close. A single consolidated area with a porous spongy structure occurs due to melting of the carbon fibres in the ABS+CF composite. The results show that the laser shock peening has a significant effect on the surface microstructure. It is therefore necessary to carry out further experiments to select the optimum laser shock peening parameters and a protective layer material to eliminate the process-induced defects and improve the strength properties of the composites.

Keywords

x-ray computed microtomographycompositePEEKABSfibre analysislaser shock peening

РЕНТГЕНОВСКАЯ КОМПЬЮТЕРНАЯ ТОМОГРАФИЯ АКРИЛОНИТРИЛ БУТАДИЕН СТИРОЛА И ПОЛИЭФИРЭФИРКЕТОНА ПОСЛЕ ЛАЗЕРНОГО УДАРНОГО ВОЗДЕЙСТВИЯ

Представлено исследование 3D-структуры композиционных материалов полиэфирэфиркетона (PEEK) и акрилонитрил бутадиен стирола с добавлением короткого углеродного волокна в матрицу (ABS+CF), выполненное при помощи компьютерной томографии на микромоторфаке SkyScan 1272 Bruker. Исходная микроструктура образцов ABS+CF обнаруживает как наличие дискретных углеродных волокон, так и дефектов 3D-печати в виде консолидированных структур из связанных между собой волокон и сгустков уплотненной полимерной матрицы. Армирующие волокна и консолидированные структуры характеризуются плотным, равномерным субгоризонтальным расположением по всему объему образца. Результаты компьютерной микротографии образцов полимера PEEK демонстрируют характерные для данного полимера дефекты процесса его укладки, отчетливо визуализирующиеся в виде трубчатых структур уплотненного полимера с пустым пространством внутри. Анализ микроструктуры образцов после лазерного ударного упрочнения показал, что значительные изменения в обоих материалах наблюдаются только в режиме пятикратного импульсного ударного лазерного воздействия. В случае экспозиции однократным импульсом и обработки области на поверхности образцов изменения микроструктуры не происходит. В режиме испытаний без защитного поверхностного слоя происходит глубокая деградация структуры PEEK образцов с испарением материала до глубин 0,3 мм, при этом не происходит закрытия сформированных при печати межслойный поровых пространств. В образцах, армированных углеродным волокном, происходит существенная модификация микроструктуры вследствие расплавления волокон и образования единой консолидированной области с пористой «губчатой» структуроной. Полученные результаты свидетельствуют о значительном влиянии лазерного ударного воздействия на качество поверхности и микроструктуру исследуемых материалов при выбранных параметрах лазерного ударного воздействия. Таким образом, необходимо проведение дополнительных экспериментов с подбором оптимальных характеристик лазерного ударного воздействия и материала защитного слоя с акустическими свойствами, близкими к свойствам исследуемых материалов, для устранения возникших при печати дефектов и улучшению прочностных свойств композиционных полимерных материалов с помощью метода лазерного ударного упрочнения.

Ключевые слова

рентгеновская компьютерная микромотографиякомпозиционные материалыполиэфирэфиркетонакрилонитрил бутадиен стироланализ волоконлазерное ударное упрочнение

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Article information

Published: 21 December 2023
Issue date: 21 December 2023
Issue: No. 6 (2023)