Computational micromechanics model for the analysis of fiber kinking in unidirectional fiber-reinforced polymers

Herráez, M.; Bergan, Andrew C.; Lopes, C.S.; González, C.

doi:10.1016/j.mechmat.2019.103299

Cited by 33 publications

(17 citation statements)

References 45 publications

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“…Mixed-mode damage evolution is governed by the energy-based Benzeggagh-Kenane (BK) damage propagation criterion, determined by the BK power exponent η BK and the normal and shear fracture toughness G n , G s . Strength and modulus of elasticity of the fiber-matrix interface adopted here were estimated by Herr aez et al 24 based on the calibration of the in-plane shear model, which are also in agreement with experimental values reported in the literature. 31 Although the normal fracture energy, G n , is difficult to measure experimentally, it was believed to be in the range of 2 to 5 J/m 2 .…”

Section: Constitutive Model Formulationsupporting

confidence: 86%

“…AS4 carbon fibers are chosen as the fiber material in the present study. Its mechanical properties can be obtained from the literature, 24,25 as listed in Table 1, which were determined via the characterization tests, including micropillar compression experiments. The maximum stress criterion is used to determine fiber failure in either longitudinal tension or compression.…”

Section: Constitutive Model Formulationmentioning

confidence: 99%

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Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments

Xie,

Ning

2024

Polymer Composites

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Compressive strength and failure mode of carbon fiber reinforced polymer (CFRP) composites are affected by the severity of fiber misalignment. In this paper, numerical models based on computational micromechanics are proposed to investigate the correlation between fiber misalignment and compression failure. A single‐fiber micromodel including fiber, matrix, and interface phases is first developed to capture the influence of misalignment severity on the material failure mode. The failure longitudinal stress distribution in the fiber predicted by the micromodel indicates that the failure mode depending on the initial misalignment can be identified as uniform compression failure, compression‐bending combination collapse, and fiber buckle. A mesoscale 2D model with multiple fibers is then constructed to investigate the kink band formation. This model takes into account the distribution of fiber misalignments to capture the key geometric features of fiber misalignment that influent the compression failure in realistic composite materials at the structural scale. The results show that fiber misalignment angle amplitude, misalignment dispersion (characterized by the standard deviation), and misalignment wavelength are the key parameters of fiber misalignment, which have significant effects on compression strength and kink band geometry.Highlights Single‐fiber model to capture the effect of misalignment severity on failure mode. Multi‐fiber model with randomly distributed fiber misalignments. Failure mode depending on the severity of initial misalignment was identified. Key parameters of misalignment on compression strength and kink band geometry.

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Section: Constitutive Model Formulationsupporting

confidence: 86%

Section: Constitutive Model Formulationmentioning

confidence: 99%

Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments

Xie,

Ning

2024

Polymer Composites

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“…Информация о закономерностях формировании полос сложенных волокон, полученная на микроуровне в испытаниях и при моделировании, может служить в дальнейшем при разработке аналитических моделей [8,10,[12][13][14].…”

Section: Introductionunclassified

“…Смятие микромеханической модели образца с учетом упругопластического поведения матрицы.Принятое в расчете пластическое поведение материала матрицы основано на модели Дрюкера-Прагера (Drucker-Prager), в которой учитывается влияние объемных деформаций и внутреннего трения, что существенно, когда матрица находится под воздействием сжатия и сдвига. В некоторых работах, посвященных микромеханическому моделированию, показана эффективность указанной формулировки[13,21]. Данная модель является встроенной в расчетном комплексе Abaqus, в руководстве пользователя [27] есть подробное описание модели и набор типовых свойств для расчета.…”

unclassified

“…Данная модель является встроенной в расчетном комплексе Abaqus, в руководстве пользователя [27] есть подробное описание модели и набор типовых свойств для расчета. Значение предела текучести V y 80 МПа матрицы выбрано по результатам анализа данных статей[13,21, 27].По результатам расчета микромеханической модели построена зависимость действующей на образец силы от перемещений заделки образца. Данную кривую можно условно разделить на три участка: линейно-упругий участок, участок с выраженной нелинейностью, участок полной потериA B Смешанная модель (A -материал болта, B -гетерогенный материал, Сгомогенный материал).несущей способности (рис.…”

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Моделирование Смятия Композитного Материала Методами Вычислительной Микромеханики

Турбин¹,

Трифонов²,

Ковтунов³

2022

mkm

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Предложен метод изучения смятия однонаправленного композитного материала на основе вычислительной микромеханики. Микромеханическая модель использована для изучения упругости и прочности однонаправленного композитного материала в условиях работы на смятие под крепежным элементом. Модель имитирует результаты испытаний на полуобразце с отверстием диаметром 6 мм. На модели, учитывающей только геометрическую нелинейность, показано влияние трения контакта и дефектов волокна на модуль упругости смятия. На модели с упругопластическими свойствами матрицы показаны особенности образования полос кинкинга волокон и выявлена последовательность разрушения при смятии. Полученные закономерности могут быть учтены при создании модели разрушения обобщенного материала слоя и изучении смятия на разнонаправленных укладках.

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A micromechanical study on shear performance of unidirectional composites with randomly distributed fibers in the transverse cross‐section

Muthukumar,

Kumar,

Shubham

et al. 2024

Polymer Composites

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The properties of unidirectional (UD) composites has been investigated by analyzing their elastic and strength characteristics under shear loading. The UD fiber‐reinforced polymer (FRP) composites usually consist of fibers randomly dispersed throughout the cross‐section in the transverse direction which is generally not accounted for. A micromechanical model based on finite element analysis (FEA) approach is utilized here to examine these properties. The study begins by identifying micro scale unit cells or repetitive unit cells (RUCs) at the micro scale, as well as representative volume elements (RVEs). The distribution of fiber volume fraction (Vf) varies among various micro scale unit cells positioned in the transverse cross‐section. The elastic properties and strength are estimated by considering the properties of the matrix and fibers, and the configuration of micro scale unit cells, which feature a fiber arrangement which is categorized as hexagonal and varying Vf at different locations (from 0.35 to 0.75). However, the overall Vf for the UD composite remains constant at 0.65. Studies are also carried out with the random distribution of fibers at micro scale unit cells. The findings reveal that the random distribution of fibers significantly impacts the shear behavior of the composite. This investigation provides valuable insights into how the mechanical properties of the UD composite are subjective by the distribution of fiber, thereby contributing to the design and development of this light weight high‐performance material.Highlights Elastic and strength analysis of UD composites is presented. Emphasis is on fiber dispersion in transverse plane. Microscale unit cells, RUCs and RVE are identified. Studies are carried out based on micromechanical model. Influence of fiber distribution on shear behavior is investigated.

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Computational micromechanics model for the analysis of fiber kinking in unidirectional fiber-reinforced polymers

Cited by 33 publications

References 45 publications

Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments

Microscale and mesoscale modeling for compressive failure in unidirectional carbon fiber reinforced polymer composites with random distribution of fiber misalignments

Моделирование Смятия Композитного Материала Методами Вычислительной Микромеханики

A micromechanical study on shear performance of unidirectional composites with randomly distributed fibers in the transverse cross‐section

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