Effect of fiber, matrix and interface properties on the in-plane shear deformation of carbon-fiber reinforced composites

Totry, Essam; Molina-Aldareguía, J.M.; González, C.; LLorca, J.

doi:10.1016/j.compscitech.2010.02.014

Cited by 252 publications

(123 citation statements)

References 34 publications

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“…A description of the various mechanical characteristics are shown in Figure 11b. Strain hardening is expected to be a consequence of fibre rotation (the scissoring action of the fibres, aligning themselves to the stress field) [43], whereas the necking phase is expected to be the result of the fibre scissoring (rotation), inducing stress inwards, contributing to a Poisson contraction. In addition to the fibre rotation, the orientation of the fibres hinders transverse crack propagation, allowing for progressive failure (as opposed to the tensile tested specimens).…”

Section: In-plane Shear Testmentioning

confidence: 99%

“…In addition to the fibre rotation, the orientation of the fibres hinders transverse crack propagation, allowing for progressive failure (as opposed to the tensile tested specimens). Interfacial de-bonding of the fibre from the matrix does not occur until a high shear strain is reached [43] with the ultimate failure of the ±45 o woven fibre composites occurring due to the fibre breakage and pull-out [21]. The SR-CFRP displayed a large extension of the strain-hardening regime, resulting in an overall larger extension to failure compared to the other materials.…”

Section: In-plane Shear Testmentioning

confidence: 99%

“…Totry et al [43] carried out simulations and experiments on IPS properties of CFRP and attributed the initial elastic region and the strain hardening to be dependent on the Vf with greater GSC accompanying higher Vf [43,45]. Barbero et al [46] stated increased τIPS values with increasing Vf for E-glass composites.…”

Section: In-plane Shear Testmentioning

confidence: 99%

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Development of sizing-free multi-functional carbon fibre nanocomposites

Pozegic

Jayawardena

Chen

et al. 2016

Composites Part A: Applied Science and Manufacturing

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms AbstractHigh quality multi-walled carbon nanotubes (CNTs) grown at high density using a low temperature growth method are used as an alternative material to polymer sizing and is utilised in a series of epoxy composites reinforced with carbon fibres to provide improved physical and electrical properties. We report improvements for sizing-sensitive mechanical and physical properties, such as the interfacial adhesion, shear properties and handling of the fibres, whilst retaining resin-infusion capability. Following fibre volume fraction normalisation, the carbon nanotube-modified carbon fibre composite offers improvements of 146 % increase in Young's modulus; 20% increase in ultimate shear stress; 74 % increase in shear chord modulus and an 83 % improvement in the initial fracture toughness. The addition of CNTs imparts electrical functionalisation to the composite, enhancements in the surface direction are 400%, demonstrating a suitable route to sizing-free composites with enhanced mechanical and electrical functionality.

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Section: In-plane Shear Testmentioning

confidence: 99%

Section: In-plane Shear Testmentioning

confidence: 99%

See 1 more Smart Citation

Development of sizing-free multi-functional carbon fibre nanocomposites

Pozegic

Jayawardena

Chen

et al. 2016

Composites Part A: Applied Science and Manufacturing

View full text Add to dashboard Cite

show abstract

“…(Note that this situation contrasts markedly with RVE models used to compute the deformation response of polymer matrix composites (PMCs). In PMCs undergoing plastic deformation, the length of the RVE can be taken to be arbitrarily small, thereby allowing for a large number of fibers with non-uniform spacing to be readily tackled with existing computational capabilities (see, for instance, Totry et al, 2010).) In order to strike a balance between computational efficiency and model accuracy, we assume here that the fibers are arranged in a regular, square array and that the matrix cracks are evenly spaced.…”

Section: Geometry and Meshmentioning

confidence: 99%

Matrix cracking of fiber-reinforced ceramic composites in shear

Rajan

Zok

2014

Journal of the Mechanics and Physics of Solids

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a b s t r a c tThe mechanics of cracking in fiber-reinforced ceramic matrix composites (CMCs) under general loadings remains incomplete. The present paper addresses one outstanding aspect of this problem: the development of matrix cracks in unidirectional plies under shear loading. To this end, we develop a model based on potential energy differences upstream and downstream of a fully bridged steady-state matrix crack. Through a combination of analytical solutions and finite element simulations of the constituent stresses before and after cracking, we identify the dominant stress components that drive crack growth. We show that, when the axial slip lengths are much larger than the fiber diameter and when interfacial slip precedes cracking, the shear stresses in the constituents are largely unaffected by the presence of the crack; the changes that do occur are confined to a 'core' region within a distance of about one fiber diameter from the crack plane. Instead, the driving force for crack growth derives mainly from the axial stresses-tensile in the fibers and compressive in the matrix-that arise upon cracking. These stresses are wellapproximated by solutions based on shear-lag analysis. Combining these solutions with the governing equation for crack growth yields an analytical estimate of the critical shear stress for matrix cracking. An analogous approach is used in deriving the critical stresses needed for matrix cracking under arbitrary in-plane loadings. The applicability of these results to cross-ply CMC laminates is briefly discussed.

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“…Plasticity was employed to model the non-linear response of the matrix and failure was introduced by allowing the fiber-matrix interface to debond using cohesive zone elements. [17][18][19] The response of a statistical sample of RUCs subjected to a combination of transverse compressive and transverse shear was reported. In the current work, the focus is restricted to the microscale to evaluate the capabilities of the smeared crack band model to predict progressive failure evolution within a composite microstructure, using the semi-analytical methods (GMC and HFGMC), by verifying and validating this implementation, as well as the overall utility of the micromechanics models employed, against available experimental data, and an analogous, fully numerical (FEM) model.…”

Section: Introductionmentioning

confidence: 99%