Microscale finite element analysis for predicting effects of air voids on mechanical properties of single fiber bundle in composites

Jiang, Hongyong; Ren, Yiru; Liu, Zhihui; Zhang, Songjun

doi:10.1007/s10853-018-2928-6

Cited by 44 publications

(16 citation statements)

References 36 publications

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“…This figure is presented to demonstrate the misleading condition, and it can be anything in quantity depending on voids, load conditions, and constituents (fiber and matrix) in composites. The misleading percents due to the effect of voids are also included in the figure from the surveyed literature [ 82 , 86 , 89 , 94 , 96 , 97 ]. This is why, for an effective design, the void’s exact state (from manufacturing conditions) should be considered to save the design from being misleading.…”

Section: Discussionmentioning

confidence: 99%

“…They obtained that voids affect pre-peak and post-peak conditions, and two types of failure modes (single and two macro-scale crack) were summarized. Jiang et al presented three representative unit cell (RUC) FE models with voids and used stress, stassi, and stiffness degradation failure criteria with different loading and concluded matrix failure domination and showed transverse strength effects more than shear strength in the presence of voids [ 94 ]. They studied the effect of voids with 0.15%, 0.5%, to 5% on a carbon fiber reinforced composites’ bundle and proved that voids diminish the strength and stress concentration depending on loading directions.…”

Section: Failure Theoriesmentioning

confidence: 99%

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Review and Suggestion of Failure Theories in Voids Scenario for VARTM Processed Composite Materials

2021

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Fiber-reinforced composite structures are used in different applications due to their excellent strength to weight ratio. Due to cost and tool handling issues in conventional manufacturing processes, like resin transfer molding (RTM) and autoclave, vacuum-assisted resin transfer molding (VARTM) is the best choice among industries. VARTM is highly productive and cheap. However, the VARTM process produces complex, lightweight, and bulky structures, suitable for mass and cost-effective production, but the presence of voids and fiber misalignment in the final processed composite influences its strength. Voids are the primary defects, and they cannot be eliminated completely, so a design without considering void defects will entail unreliability. Many conventional failure theories were used for composite design but did not consider the effect of voids defects, thus creating misleading failure characteristics. Due to voids, stress and strain uncertainty affects failure mechanisms, such as microcrack, delamination, and fracture. That’s why a proper selection and understanding of failure theories is necessary. This review discusses previous conventional failure theories followed by work considering the void’s effect. Based on the review, a few prominent theories were suggested to estimate composite strength in the void scenario because they consider the effect of the voids through crack density, crack, or void modeling. These suggested theories were based on damage mechanics (discrete damage mechanics), fracture mechanics (virtual crack closure technique), and micromechanics (representative volume element). The suggested theories are well-established in finite element modeling (FEM), representing an effective time and money-saving tool in design strategy, with better early estimation to enhance current design practices' effectiveness for composites. This paper gives an insight into choosing the failure theories for composites in the presence of voids, which are present in higher percentages in mass production and less-costly processes (VARTM).

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Section: Discussionmentioning

confidence: 99%

Section: Failure Theoriesmentioning

confidence: 99%

Review and Suggestion of Failure Theories in Voids Scenario for VARTM Processed Composite Materials

2021

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“…According to Vajari [17,18], increasing the number of matrix voids or void density in the model has no significant effect on the strengths or moduli but alters the crack path. In this study, the latter method was adopted, and its feasibility has been verified by many researchers [28,29,31,32]. To generate the random voids in the matrix, a Python (Python Software Foundation, Beaverton, OR, USA) script was used to modify the input file for ABAQUS 2020(Dassault Systemes Simulia Corp., Johnstone, RI, USA).…”

Section: Microscale Model For Ud Compositesmentioning

confidence: 99%

“…Materials 2021, 14, x FOR PEER REVIEW 5 of 22 [28,29,31,32]. To generate the random voids in the matrix, a Python (Python Software Foundation, Beaverton, OR, USA) script was used to modify the input file for ABAQUS 2020(Dassault Systemes Simulia Corp., Johnstone, RI, USA).…”

Section: Microscale Model For Ud Compositesmentioning

confidence: 99%

Multiscale Analysis of Mechanical Properties of 3D Orthogonal Woven Composites with Randomly Distributed Voids

et al. 2021

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Voids are common defects in 3D woven composites because of the complicated manufacturing processes of the composites. In this study, a micro–meso multiscale analysis was conducted to evaluate the influence of voids on the mechanical properties of three-dimensional orthogonal woven composites. Statistical analysis was implemented to calculate the outputs of models under the different scales. A method is proposed to generate the reasonable mechanical properties of the microscale models considering randomly distributed voids and fiber filaments. The distributions of the generated properties agree well with the calculated results. These properties were utilized as inputs for the mesoscale models, in which void defects were also considered. The effects of these defects were calculated and investigated. The results indicate that tensile and shear strengths were more sensitive to the microscale voids, while the compressive strength was more influenced by mesoscale voids. The results of this study can provide a design basis for evaluating the quality of 3D woven composites with void defects.

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“…After hundreds of million-year of natural evolution, the unique biological structure of animals and plants have excellent mechanical properties which can achieve self-protection or resist natural enemies [1][2][3][4][5][6][7]. With the rapid development of modern science and technology, composite materials with high strength, light weight and impact resistance have a wide range of needs in the fields of aerospace, military, automobiles and other fields.…”

Section: Introductionmentioning

confidence: 99%

Research on the Impact Resistance of the Periodic Helicoidal Multilayer Bionic Structure Based on Osteon Microstructure

Liu

Chen

et al. 2021

Preprint

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Background: As a typical biological material, bone have excellent mechanical properties and plays an important role in supporting the animal body and protecting organs, osteon is an important part of bone. It is found that the osteon is composed of thin and thick lamellae which are periodic and approximately concentric, every 5 lamellae is a cycle, the periodic helix angle of mineralized collagen fibers in two adjacent sub-lamellae is 30°. Four biomimetic composite models with different fiber helix angles were established and fabricated according to the microstructure of mineralized collagen fibers in osteon. Based on the impact analysis of four kinds of bionic composite models, the effects of the fiber periodic helicoidal structure on the impact resistance and energy dissipation of multi-layer bionic composite were investigated. Results: The analysis results show that the fiber helix angle affects the impact damage resistance and energy dissipation of multi-layer fiber reinforced composites. Among the four kinds of multi-layer composite models, the composite model with helix angle of 30° has better comprehensive ability to resist impact damage. The test results show that the impact damage area of the specimen with 30° helix angle is smallest among the four types of bionic specimens, which is consistent with the results of finite element impact analysis. Furthermore, in the case of no impact damage, the smaller the fiber helix angle is, the more uniform the stress distribution is and more energy is dissipated in the impact process. Conclusions: The periodic helicoidal structure of mineralized collagen fibers in osteon are the result of natural selection of biological evolution. This structure can effectively improve the ability of cortical bone to resist external impact. The research results can provide useful guidance for the design and manufacture of high-performance and strong impact resistant biomimetic composites.

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Microscale finite element analysis for predicting effects of air voids on mechanical properties of single fiber bundle in composites

Cited by 44 publications

References 36 publications

Review and Suggestion of Failure Theories in Voids Scenario for VARTM Processed Composite Materials

Review and Suggestion of Failure Theories in Voids Scenario for VARTM Processed Composite Materials

Multiscale Analysis of Mechanical Properties of 3D Orthogonal Woven Composites with Randomly Distributed Voids

Research on the Impact Resistance of the Periodic Helicoidal Multilayer Bionic Structure Based on Osteon Microstructure

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