Cohesive zone model of carbon nanotube-coated carbon fiber/polyester composites

Agnihotri, Prabhat; Kar, Kamal K.; Basu, S.

doi:10.1088/0965-0393/20/3/035014

Cited by 16 publications

(15 citation statements)

References 48 publications

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“…The CFEM has been successfully applied to predict the damage initiation and evolution explicitly. Furthermore, it can model spontaneous multiple crack behavior, so it has been widely used to investigate damage process [38][39][40][41][42][43]. Here, our interest is in the high nonlinearity involving the interaction of multiple microcracks, and thus the CFEM is particularly appealing.…”

Section: Cohesive Finite Element Methodsmentioning

confidence: 99%

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Guo

Sun

Yang

et al. 2018

Metals

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Abstract:The fatigue resistance of coarse-grained (CG) metals can be greatly improved by introducing a nanograined surface layer. In this study, the Weibull distribution is used to characterize the spatially-random fracture properties of specimens under axial fatigue. For the cylindrical solid specimen, the heterogeneity of element sizes may lead to unfavorable size effects in fatigue damage initiation and evolution process. To alleviate the size effects, a three-dimensional cohesive finite element method combined with a local Monte Carlo simulation is proposed to analyze fatigue damage evolution of solid metallic specimens. The numerical results for the fatigue life and end displacement of CG specimens are consistent with the experimental data. It is shown that for the specimens after surface mechanical attrition treatment, damage initiates from the subsurface and then extends to the exterior surface, yielding an improvement in the fatigue life. Good agreement is found between the numerical results for the fatigue life of the specimens with the nanograined layer and experimental data, demonstrating the efficacy and accuracy of the proposed method.

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Section: Cohesive Finite Element Methodsmentioning

confidence: 99%

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Guo

Sun

Yang

et al. 2018

Metals

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“…Such poor interfacial adhesion could limit the mechanical properties of CFRP composites [4][5][6]. Ozdemir et al [7], Velasco-Santos et al [8], and Agnihotri et al [9] investigated the use of carbon fiber reinforced polymers without carbon fiber surface treatment resulting in low interlaminate shear strength, which causes poor interfacial bonding between the carbon fibers and polymeric matrices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Multiwalled Carbon Nanotubes and Electroless Copper Plating on the Tensile Behavior of Carbon Fiber Reinforced Polymers

Truong

Kim

Choi

2018

Advances in Materials Science and Engineering

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Multiwalled carbon nanotubes (MWCNTs) and nanoscaled electroless copper plating were introduced to enhance the mechanical properties of carbon fiber reinforced polymer (CFRP) composites in this study. e influence of multiwalled carbon nanotubes (MWCNTs) with weight fractions of 0.5-1.5% of epoxy resin on the mechanical properties of CFRP composites was investigated.e MWCNTs and epoxy resin was first mixed, prior to impregnating the carbon fiber fabrics. Electroless copper plating, a deposit method using simultaneous reactions in an aqueous (copper) solution without external electric power, was applied on the carbon fiber surface, and the effect was also investigated. e CFRP test specimens were fabricated by hand lay-up method, using one or three carbon fiber fabrics. e mechanical properties of the CFRP test specimens were derived by tensile tests according to KS M ISO 527-4. According to the morphology taken by SEM, the carbon fiber surface was significantly rough with copper ions. Because of this, the strength and ultimate strain of coated specimens increased up to 26.3 and 18.6% compared to noncoated specimens, respectively. In addition, as the MWCNTs amount increased, the ultimate strain of the composites also increased. In the case of CFRP test specimens using noncoated carbon fiber fabrics, the addition of 1.5% wt. MWCNTs increased the peak strength and ultimate strain of CFRP specimens up to 80.5 and 48.8%, respectively. Finally, the tensile stress-strain relationship of CFRP specimens was idealized as bilinear or trilinear response curves.

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“…Modified classical shear-lag theory with introducing nonlinear interface laws for CNTspolymer interfaces has been established based on the van der Waals interfacial interaction [12,13] and chemical bonding [14], respectively. And cohesive zone finite element models with a nonlinear interface cohesive law have been established to model the pullout response of CNTs-coated fibers [15,16]. However, linear interface law was also proposed for 2 Advances in Materials Science and Engineering CNTs pullout from a polymer matrix to investigate fracture toughness enhancement and bond breaking [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Research on the Pullout Failure of GFRP Bolt

Wang

et al. 2017

Advances in Materials Science and Engineering

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The fiber pullout is a main failure after the fiber is broken in the tension of glass fiber reinforced polymer (GFRP) bolt. In this paper, the numerical analysis is done on the distribution of both fiber normal force and interface shear stress. The results show that, on the ideal interface, the fiber pullout occurs from the lower end to the upper end of the matrix gradually, and both the normal stress of the fiber and the shear stress of the ideal interface gradually increase from the lower end to the upper end. With the increase of the interface layer thickness, the shear stress concentration area on the interface is enlarged while the stress applied is reduced, and the displacement of GFRP deformation is increasing sharply. This means that the capacity of GFRP deformation is enhanced. As a soft elastic body, the interface layer with a smaller elastic modulus can make the fiber stress and the interface shear stress sharply small and well dispersed. In addition, the load can be effectively transferred to the reinforced phase fibers in a bigger interfacial layer elastic modulus with a certain strength.

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Cohesive zone model of carbon nanotube-coated carbon fiber/polyester composites

Cited by 16 publications

References 48 publications

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Local Monte Carlo Method for Fatigue Analysis of Coarse-Grained Metals with a Nanograined Surface Layer

Effect of Multiwalled Carbon Nanotubes and Electroless Copper Plating on the Tensile Behavior of Carbon Fiber Reinforced Polymers

Numerical Research on the Pullout Failure of GFRP Bolt

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