The influence of fibre aspect ratio on the deformation of discontinuous fibre-reinforced composites

Robinson, I. M.; Robinson, Jason

doi:10.1007/bf00356507

Cited by 46 publications

(26 citation statements)

References 35 publications

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“…Modulus significantly increased immediately at a fiber length of 0.5 mm, or approximately the critical length estimated from literature, whereas strength was not expected to increase until about 2L c [48]. As previously described, the plateau region was predicted to occur at 4-5×, the critical length for strength [52,53], or ~2.0 mm, which was also seen experimentally for modulus. Initial elastic isostrain deformation defining the micromechanics related to modulus does not include manifestation of composite defects in the plastic region of the load-deflection curve so that crack propagation around fiber ends is not a confounding variable, which was seen with flexural strength.…”

Section: Modulussupporting

confidence: 65%

“…The plateau region for fiber length has further been proposed to exist at 4-5 L c [52,53] so that for the quartz fiber vinyl ester resin system with the experimental plateau starting near 2.0 mm, L c should be approximately between 0.4 and 0.5 mm. Therefore, the critical length of 450 μm already plotted in Fig 3B appeared to be an acceptable approximation, although this value was unacceptable for explaining the large differences with experimental data.…”

Section: Mechanical Properties and Analysesmentioning

confidence: 99%

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Stress‐transfer micromechanics for fiber length with a photocure vinyl ester composite

2006

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The objective was to test how increasing fiber length above the critical length would influence mechanical properties and fracture crack propagation. Micromechanics considering fiber/matrix stress-transfer was used to evaluate the results in addition to a shear debonding volume percent correction term necessary for the final analysis. Fiber lengths of 0.5, 1.0, 2.0, 3.0, and 6.0 mm with 9 μm diameters were added into a photocure vinyl ester particulate-filled composite at a uniform 28.2 vol%. Mechanical flexural testing was performed using four-point fully articulated fixtures for samples measuring 2 × 2 × 50 mm 3 across a 40 mm span. Fiber length correlated with improved mechanical properties for flexural strength, modulus, yield strength, strain, work of fracture, and strain energy release, p < 0.001. In addition, sample fracture depth significantly decreased with increasing fiber lengths, p < 0.00001. All mechanical properties correlated significantly as predictors for fracture failure, p < 0.000001, and as estimators for each other, p < 0.0001. The stress-transfer micromechanics for fiber length were improved upon for strength by including a simple correction factor to account for loss of fiber volume percent related to cracks deflecting around debonded fiber ends. In turn, the elastic property of modulus was shown to exhibit a tendency to follow stress-transfer micromechanics.

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Section: Modulussupporting

confidence: 65%

Section: Mechanical Properties and Analysesmentioning

confidence: 99%

Stress‐transfer micromechanics for fiber length with a photocure vinyl ester composite

2006

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“…Krenchel (18) showed that η o in the Cox modulus model (equation 5) can be calculated from η o = < cos 4 (φ) > and this has been used with some success in modeling the stiffness of composites (25)(26)(27). However it can be seen in Figure 18 that these values fall well below the values calculated using equation 5, which we have observed and reported previously (7,22).…”

Section: Discussionmentioning

confidence: 62%

Structure-property relationships in glass-reinforced polyamide, part 1: The effects of fiber content

Thomason¹

2006

Polym Compos

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We present the results of an extensive study of the performance of injection moulded glass-fibre reinforced polyamide 66 with glass content between 0-40% and based on two chopped glass products both sized with polyamide compatible sizing. Mechanical properties generally improved with increasing glass content, modulus linearly, strength with a maximum at 40-50% glass content, and impact showing an initial decrease from the resin value with a minimum at 4% glass content before increasing at higher glass contents. Residual fibre length decreased linearly with increasing glass content. Interfacial strength was found to be in the 30-36 MPa range and no significant differences in dry as moulded performance was found between the 123D and 173X sizings. Conditioning these composites in either boiling water or water/glycol mixtures leads to a dramatic drop in both tensile modulus and tensile strength. This is most likely due to the high level of matrix plasticization. After conditioning the 173X sized glass delivered a significantly higher level of tensile elongation at all fibre contents. Excellent agreement was obtained between the experimental data and the theoretical predictions of the Cox model for modulus and the Kelly-Tyson model for strength over the range of fibre concentrations studied.

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“…Although the strength of single plant fibres can be affected by the length of a single fibre, the most important parameter is the ratio of fibre length to the diameter (aspect ratio) (Peltola et al 2011). Moreover, this parameter can be used to characterise the mechanical performance of natural fibres (Robinson and Robinson 1994). In Table, it can be seen that the diameter, length, and density of fibres varied between the species and their portions.…”

Section: Characterisation Of Single Bamboo Fibres From Four Species Dmentioning

confidence: 99%

Morphological, Mechanical, and Physical Properties of Four Bamboo Species

Zakikhani¹,

Zahari²,

Sultan³

et al. 2017

BioResources

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Bamboo among other plants has unique properties and massive variety. The properties of bamboo species vary between species and along their culms. The aim of this study was to investigate the characteristics of four bamboo species: Dendrocalamus pendulus (DP), Dendrocalamus asper (DA), Gigantochloa levis (GL), and Gigantochloa scortechinii (GS), and their three portions (bottom (B), middle (M), and top (T)). The number of fibre strands in vascular bundles and the single fibres extracted from every portion was studied. The distribution of fibres varied along the bamboo culms and between species. The DP species showed the highest water content and water absorption and the lowest mechanical properties. The DA species exhibited the best mechanical and physical properties. Moreover, the bottom portion of every species indicated the highest aspect ratio and tensile properties. The results indicated that before the application of bamboo culms in composite materials, the bamboo species should be characterized so that it can be utilised effectively as a renewable reinforcement in composites.

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The influence of fibre aspect ratio on the deformation of discontinuous fibre-reinforced composites

Cited by 46 publications

References 35 publications

Stress‐transfer micromechanics for fiber length with a photocure vinyl ester composite

Stress‐transfer micromechanics for fiber length with a photocure vinyl ester composite

Structure-property relationships in glass-reinforced polyamide, part 1: The effects of fiber content

Morphological, Mechanical, and Physical Properties of Four Bamboo Species

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