Modeling the Nonlinear Deformation and Damage of Carbon-Aramid Fabric Composites in Tension

Leshkov, E. V.; Сапожников, С. Б.

doi:10.1007/s11029-020-09906-1

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…This phenomenon can be explained by an uneven fracture of the carbon layers in the hybrid composite along the length of the specimen. Similar fracture mechanism was also observed during static tests [29].…”

Section: Resultssupporting

confidence: 80%

“…Polymer composites based on carbon fabric manufactured by the CJSC Composite Holding Company [27] (2/2-1000-3K-200, St-12403, twill weave) and aramid fabric manufactured by the LLC "NPP "Termoteks" [28] (S-125, twill weave) were produced for ballistic tests. Stacking sequence of the carbon/aramid hybrid composite with pronounced pseudo-yield behaviour was designed using FARGR-2 [29]. The number of layers in the package was selected so that the surface density of all materials differed by no more than 5%.…”

Section: Methodsmentioning

confidence: 99%

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Experimental Study of Tensile Preloading Influence on the Mechanical Behaviour of Pseudo-Ductile Hybrid Composite under High-Velocity Impact

Olivenko

Kudryavtsev

Zhikharev

2021

DDF

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The hybridisation of fibre-reinforced plastics is one of the perspective technological methods that make it possible to reduce the sensitivity of polymer composites to stress concentration and increase their damage tolerance. In this case, hybridisation means a combination of different types of reinforcing fibres in one yarn, one layer or one package. In most published papers, the authors investigated the mechanical behaviour of hybrid fibre-reinforced plastic under static loading or low-velocity impact conditions only. At the same time, statically preloaded structures made of composite materials can also be subjected to high-velocity impact. Tensile or compressive preloading affects not only the amount of energy absorbed by the composite but also changes the deformation and fracture pattern. This paper presents the results of the experimental study of the mechanical behaviour of a woven carbon/aramid hybrid composite under tensile preloading and high-velocity impact. Pre-tensioned specimens of homogeneous and hybrid composites were subjected to a high-velocity impact by a steel spherical projectile with the velocities up to 900 m/s. The experimental results showed that the hybrid composite had the lowest sensitivity of the ballistic limit to the tensile preloading.

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Section: Resultssupporting

confidence: 80%

Section: Methodsmentioning

confidence: 99%

Experimental Study of Tensile Preloading Influence on the Mechanical Behaviour of Pseudo-Ductile Hybrid Composite under High-Velocity Impact

Olivenko

Kudryavtsev

Zhikharev

2021

DDF

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“…The ratio depends on their mechanical characteristics (modulus of elasticity, tensile strength) and the orientation of the fibres to the loading direction. The previously developed FARGR-2 software module [17] was used to calculate nonlinear stressstrain diagrams for layered composites consisting of fabric layers with arbitrary fibre orientations. To obtain the calculated stress-strain diagram, it is required to set the elastic characteristics of the fabric layer (E 1 , E 2 , G 12 , μ 12 ), as well as the warp/weft strength limits F 1t /F 2t , shear strength F 12 .…”

Section: Hybrid Composites Designmentioning

confidence: 99%

“…In this case, LE layers are unloaded which can lead to an overload of HE component layers and a general decrease in the strength. It should be noted that in most studies the authors considered hybridisation of unidirectional composites, whereas only a few works are devoted to hybridisation using fabrics with plain, twill, or satin weave structures [17].…”

Section: Introductionmentioning

confidence: 99%

Methods for Reducing Notch Sensitivity of Hybrid Pseudo-Ductile Polymer Composites With Fabric Reinforcement: Experimental Study

Leshkov

Olivenko

Kudryavtsev

et al. 2023

PNRPU Mechanics Bulletin

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Composite materials reinforced with synthetic fibres have been used in aviation and space technology for more than half a century. Fibre-reinforced composites with high specific strength and corrosion resistance are an attractive alternative to traditional structural materials, including steels, aluminium and titanium alloys. At the same time, composites based on carbon and glass fibres are inherently brittle structural materials with high strength sensitivity to stress concentrations due to the design features of the structures or defects that occur in operation. One way to solve this problem is hybridisation which makes it possible to increase the nonlinearity of the composite stress-strain diagram and reduce sensitivity to notches. Hybrid composites combine several types of reinforcing filler with different fracture strains and exhibit a pronounced pseudo-ductile plateau in tension. Such material behaviour ensures the redistribution of stresses near the concentrator and potentially reduce notch sensitivity. When designing hybrids, it is necessary to take into account the influence of different factors including the ratio between the components and their lay-up, using various technological methods, and the specific strength of the finished material. This paper presents the results of an experimental study on the strength of hybrid composites based on glass and carbon fabrics in the open hole tests. It was found that hybrids with an extended hardening area after the pseudo-yield plateau are were more notch sensitive. A low elongation component layers rotation on angles up to 10°, as well as the use of thin polymer veils, also reduce the sensitivity of the composite strength to the presence of the defects.

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“…Thus, a sudden collapse after overloading is not observed in these materials which minimizes the risks of the occurrence of a catastrophic failure [8][9][10]. The pseudo-ductility behavior in composites is obtained by hybridization of fibers with high and low failure strains, such as carbon and glass fibers, respectively [11][12][13][14]. Due to the difference in strain energy between plies, the middle ply fails first and then the created crack propagates through other plies until the whole structure fails.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the failure behavior of pseudo-ductile composites using a multi-scale finite element model

Abdellahi,

Azhari,

Nguyen

2024

Preprint

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The hybridization technique has recently been used to produce a new generation of composites called pseudo-ductile composites, which have shown higher failure strain compared to conventional composites, minimizing the risks of the occurrence of a catastrophic failure. The pseudo-ductility behavior in these composites is obtained by hybridization of fibers with high and low failure strains. In this study, a multi-scale finite element (FE) model incorporating micro and macro-scales is proposed to predict the failure behavior of pseudo-ductile composites. A micro-scale representative volume element (RVE), consisting of randomly distributed fibers, was generated using a Python code. Periodic boundary conditions (PBCs) were applied to the RVE generated with a periodic geometry. To account for fiber failure and ply fragmentation, the tensile strength of fibers was distributed based on the Weibull distribution function and a user-defined UMAT subroutine was developed. Tensile loading was then applied to the RVE to simulate the composite’s mechanical behavior. For validation, an RVE was developed based on experimental data from recent research on thin-ply and conventional thickness composites. Numerical results were compared to experimental data, demonstrating acceptable agreement. In the final step, following a sequential multi-scale modeling approach, a macro-scale model was constructed based on the outputs of the micro-scale model subjected to tensile and shear loads. The results were compared with experimental data, revealing good agreement. The proposed model allows for the optimization of pseudo-ductile composite structures to achieve a desired set of mechanical properties without the need for conducting extensive experimental material tests.

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Modeling the Nonlinear Deformation and Damage of Carbon-Aramid Fabric Composites in Tension

Cited by 7 publications

References 18 publications

Experimental Study of Tensile Preloading Influence on the Mechanical Behaviour of Pseudo-Ductile Hybrid Composite under High-Velocity Impact

Experimental Study of Tensile Preloading Influence on the Mechanical Behaviour of Pseudo-Ductile Hybrid Composite under High-Velocity Impact

Methods for Reducing Notch Sensitivity of Hybrid Pseudo-Ductile Polymer Composites With Fabric Reinforcement: Experimental Study

Prediction of the failure behavior of pseudo-ductile composites using a multi-scale finite element model

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