A shear-lag model with a cohesive fibre–matrix interface for analysis of fibre pull-out

Chen, Zuorong; Yan, Wenyi

doi:10.1016/j.mechmat.2015.07.007

Cited by 40 publications

(18 citation statements)

References 40 publications

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“…The deformation associated with debonding is assumed to be elastic, although some authors have noted that plastic deformation can occur for thermoplastic systems [31], potentially invalidating results. The calculation for apparent IFSS also assumes that the stress along the interface is constant, which is a simplification, as the shear-lag approach [32,33] and FEA modelling [34,35] have both shown it varies along the embedded length. A constant interfacial stress also implies that failure is more sudden, with no account for the progressive ''unzipping'' due to interfacial crack propagation.…”

Section: Microbond Testmentioning

confidence: 99%

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

et al. 2016

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The objective of this study was to investigate the feasibility of combining discontinuous recycled carbon fibres with polypropylene, to produce a low-cost, high specific stiffness material for high-volume applications. The inherent low affinity of carbon fibre and polypropylene motivated a detailed study of the surface characteristics of carbon fibre and interfacial behaviour between the two materials, using the microbond test. The effects of removing the sizing from the fibres, as well as introducing a maleic anhydride-grafted polypropylene coupling agent, were extensively investigated. Polypropylene was found to degrade when prepared under atmospheric conditions; therefore, it was necessary to form droplets under nitrogen. Removal of the sizing from the fibre using pyrolysis and solvolysis techniques altered the surface morphology of the fibre and increased the interfacial shear strength (IFSS) by 4 and 33 %, respectively. A more significant improvement in the fibre-matrix adhesion was achieved by adding a maleic anhydride coupling agent at 2 wt%, which increased the IFSS by 320 %.

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Section: Microbond Testmentioning

confidence: 99%

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

et al. 2016

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“…They simulated RVE in a similar way as their previous research (Spanos et al., 2014) using a multi-scale FE approach. Chen and Yan (2015) derived the governing equations of a shear-lag model with a cohesive fiber–matrix interface by a bilinear cohesive traction–separation law to study the stress transfer between the fiber and matrix. Guo and Zhu (2015) investigated the interfacial shear stress transfer of a monolayer graphene on top of a polymer substrate subjected to uniaxial tension by a cohesive zone model integrated with a shear-lag model.…”

Section: Introductionmentioning

confidence: 99%

Effect of interfacial debonding on stress transfer in graphene reinforced polymer nanocomposites

Heidarhaei

Shariati

Eipakchi

2017

International Journal of Damage Mechanics

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A shear-lag analysis hybrid cohesive zone model is employed to investigate the stress transfer from polymer matrix to the graphene by considering the interfacial damage and debonding phenomena in graphene reinforced polymer nanocomposites. The applied stress can produce three cases for interface treatment: entirely intact, damaged and debonded. By using analytical derived relations, the distribution of axial stress in the graphene and interfacial shear stress at the three-mentioned states is determined and the applied stress to the nanocomposite which leads to damage and debonding initiation at the interface is evaluated. In addition, a sensitivity analysis is performed and the effects of graphene length, interfacial shear strength and graphene volume fraction on the axial stress of graphene, damage and debonding threshold stress along the interface and interfacial shear stress are studied. The results show that after applying a stress called second critical stress, the stress transfer between graphene and matrix at the bulk of graphene length (about 75% of the interface) stops due to debonding of this zone.

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“…Finite element (FE) modeling is now widely used in the simulation of fiber-reinforced composites thanks to recent advancement in numerical simulation and computer software. A number of research groups have proposed a number of methods to characterize the fiber/matrix interface for use in FE modeling of fiber-reinforced composites, including the cohesive zone method (CZM), 23–25 the perfect bonding method, 26,27 and the frictional contact method. 9 The FE models developed by Modniks and Andersons 26 and Modniks et al.…”

Section: Introductionmentioning

confidence: 99%

“…25 established 3D FE models of a short glass fiber-reinforced composite using CZM to study the longitudinal and transverse tensile behavior of the composite material with different interfacial shear strength. Chen and Yan 24 introduced cohesive fiber/matrix interface into the classical SLM to analyze the stress distribution of fiber pullout and developed FE models based on CZM to simulate fiber pullout and to verify the accuracy of the refined SLM. Insofar, CZM-based FE modeling is the most effective and convenient approach to numerical simulation of the cohesive behavior of fiber/matrix interface.…”

Section: Introductionmentioning

confidence: 99%

“…28 No study of the stress distribution of short fiber–reinforced composite systems using SLM with consideration of the cohesive behaviors of fiber/matrix interface has been identified, except for the work on fiber pullout from single fiber composites by Chen and Yan. 24 In this work, we used the experimental load–displacement curves microdroplet tests 12,29 to construct cohesion behaviors of the natural fiber/matrix interface and establish a modified SLM to analyze the elastic properties of the SNFRCs. Using this modified SLM, we investigated the effects of cohesive interfacial shear stiffness, elastic properties of the fiber and the matrix, fiber aspect ratio, and average fiber axial stress at the embedded end face of fiber on the stress–transfer characteristics and axial tensile properties of the composite.…”

Section: Introductionmentioning

confidence: 99%

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Predicting tensile behaviors of short flax fiber-reinforced polymer–matrix composites using a modified shear-lag model

Xiong

Shen

Hua

et al. 2018

Journal of Composite Materials

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Natural fiber-reinforced composites are increasingly being used in the industry. The fiber–matrix interfacial properties of the composites are influenced by many factors, including chemical treatment of the natural fiber, type of polymer matrix, composites fabrication method, and process and the service environment of the composites. In this paper, a modified shear-lag model based on a cohesive fiber/matrix interface is proposed and applied to the analysis of the stress–transfer characteristics and the tensile properties of unidirectional short flax fiber-reinforced composites. The model takes into account of the interfacial shear stiffness, bonding strength between fiber end face and matrix, fiber aspect ratio and fiber volume fraction. 3D finite element models of the composites using a cohesive zone method are used to verify the accuracy of the modified shear-lag model. The fiber tensile strength and the composite tensile elastic modulus are significantly influenced by the interfacial shear stiffness, fiber aspect ratio, and fiber volume fraction. The bonding strength between the fiber end face and the matrix only has an effect when the interfacial shear stiffness is low. The predicted results from the modified shear-lag model show good agreement with the finite element analysis and experimental results in the literature. The modified cohesive shear-lag model provides a simple and effective method for analyzing fiber axial stress, shear stress in the fiber/matrix interface, and tensile elastic modulus of the final composite.

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A shear-lag model with a cohesive fibre–matrix interface for analysis of fibre pull-out

Cited by 40 publications

References 40 publications

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

The usability of recycled carbon fibres in short fibre thermoplastics: interfacial properties

Effect of interfacial debonding on stress transfer in graphene reinforced polymer nanocomposites

Predicting tensile behaviors of short flax fiber-reinforced polymer–matrix composites using a modified shear-lag model

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