Further discussion on newly developed failure criteria for fibrous composites

Kwon, Young W.; Darcy, Joseph

doi:10.1007/s41939-018-0022-z

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…The unified failure criterion is applied to the multiscale analysis of fibrous composites, the failure of which is determined based on the failure of constituent materials such as the fiber and matrix. As a result, failure is assessed in terms of the micro-stresses and/or micro-strains [9]. There are three failure modes at the constituent material level: fiber failure, matrix failure, and fiber-matrix interface failure.…”

Section: Failure Criteriamentioning

confidence: 99%

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Failure Prediction of Notched Composites Using Multiscale Approach

Kwon

2022

Polymers

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This paper presents multiscale-based failure criteria to predict the failure of polymer composites with any shape of defect. The multiscale technique consists of bi-directional processes called upscaling and downscaling processes to link two different length scales. One is the microscale at the fiber and matrix material level, and the other is the macroscale at the homogenized composite material level. Failure criteria are applied to the microscale level such as micro-stresses and/or micro-strains occurring at the fiber and matrix material level. Recently proposed unified failure criteria are applied to the micro-stresses and/or micro-strains to predict failure at a notch. The new failure criteria have two parts, and they can be applied to any shape of defect. One is the stress or strain condition, and the other is the stress or strain gradient condition. For failure to occur, both conditions must be satisfied simultaneously. The failure criteria provide not only failure locations but also directions of failure propagation.

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Section: Failure Criteriamentioning

confidence: 99%

“…A more recently proposed set of failure criteria used the micro-stresses/strains instead of macro-stresses/strains [8][9][10]. Therefore, more physical stresses and strains were Polymers 2022, 14, 2481 2 of 12 considered for the failure criteria.…”

Section: Introductionmentioning

confidence: 99%

Failure Prediction of Notched Composites Using Multiscale Approach

Kwon

2022

Polymers

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“…Вместе с тем исключение составляет сжатие по оси Y, где прогнозируемое значение предела пропорциональности существенно превышает наблюдаемое в эксперименте. Здесь необходимо заметить, что эти данные получены исходя из предположения об однородном напряженном состоянии представительного объема материала и не учитывают возможные краевые эффекты, которые могут существенно повлиять на наблюдаемые экспериментально характеристики материала [13]. Так, неоднородность напряженного состояния объема УУКМ со схемой армирования 4ДЛ при нагружении вдоль оси Y была показана в [39], а наличие значительного масштабного эффекта прочности при сжатии этого класса материалов подтверждается данными, приведенными в [40].…”

Section: результатыunclassified

Structural failure criterion for spatially-reinforced carbon-carbon composite materials

Magnitsky¹

2020

PNRPU Mechanics Bulletin

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This paper defines the structural strength criterion for 4DL-reinforced carbon-carbon materials. For this scheme, fiber reinforcement consists of four groups of reinforcing elements, three of them are located in parallel planes with the angles of 120° between them and the fourth one is normal to them. The paper addresses the first failure of the material corresponding to its yield stress, in this point, one of the material components deviates from linear elastic behavior. A composite material is considered to be non-uniform structurally and consists of a matrix and reinforcing elements, rods. Those rods, in their turn, represent a unidirectional composite. To analyze the stress-strain state of individual components of the material, a three-level elastic model is built that uses the analytic approach at the micro level, while at higher levels it uses the finite element method. For numerical calculations, a structural cell of the material is taken. The boundary conditions provide small to negligible influence of the edge effects, thus simulating the behavior of the infinite volume of the material. For the material components, local strength criteria are introduced, where the fields of the criterion quantities are averaged over the volume of the structural cell. The strength surface of the material that corresponds to its first failure is obtained, and the conclusion is made that the suggested criterion provides a reasonable agreement with the available data on the typical carbon-carbon composite characteristics. Based on the calculated dependencies of the material’s yield stress on the load direction, a procedure is suggested to identify the model parameters based on the material failure behavior analysis using standard tensile and compressive tests. Estimated discrepancies between the results calculated using the suggested criterion and those obtained using the limiting stress criterion for biaxial stress states are given. It is shown that the discrepancy may reach tens of percent and in some cases the material strength increases in comparison with that in the uniaxial stress state. The results are subject to verification tests in order to verify the model for advanced spatially reinforced carbon-carbon composite materials.

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“…The details of the derivation were given in Refs. [3][4][5][6] so that they are omitted here to save space.…”

Section: Multiscale Approachmentioning

confidence: 99%

“…Because actual failures of composite materials occur in the fiber and matrix materials, it would make more sense to describe the failures directly in terms of the constituent material level. As a result, a new set of failure criteria [2,3] was developed for fibrous composite materials recently. These criteria were based on a multiscale technique such that they used stresses and strains at the representative fiber and matrix materials.…”

Section: Introductionmentioning

confidence: 99%

Failure Analysis of Composite Structures Using Multiscale Technique

Kwon

2020

MSF

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Failure analyses of laminated fibrous composite structures were conducted using the failure criteria based on a multiscale approach. The failure criteria used the stresses and strains in the fiber and matrix materials, respectively, rather than those smeared values at the lamina level. The failure modes and their respective failure criteria consist of fiber failure, matrix failure and their interface failure explicitly. In order to determine the stresses and strains at the constituent material level (i.e. fiber and matrix materials), analytical expressions were derived using a unit-cell model. This model was used for the multiscale approach for both upscaling and downscaling processes. The failure criteria are applicable to both quasi-static loading as well as dynamic loading with strain rate effects.

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Further discussion on newly developed failure criteria for fibrous composites

Cited by 8 publications

References 7 publications

Failure Prediction of Notched Composites Using Multiscale Approach

Failure Prediction of Notched Composites Using Multiscale Approach

Structural failure criterion for spatially-reinforced carbon-carbon composite materials

Failure Analysis of Composite Structures Using Multiscale Technique

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