Estimation of the elastic anisotropy of sisal fibres by an inverse method

Ntenga, Richard; Béakou, A.; Ateba, Atangana; Ohandja, Louis-Max Ayina

doi:10.1007/s10853-008-2925-2

Cited by 17 publications

(24 citation statements)

References 9 publications

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“…These models are valid for transversely isotropic laminates under plane stress conditions. Unidirectional PFCs are composed of transversely isotropic fibers/yarns embedded in an isotropic matrix, and hence they satisfy this requirement [38, 39, 52]. Here, comparisons are made between experimental data and predicted results from micromechanical models to (i) show the validity of conventional composite models for PFCs and (ii) determine, otherwise difficult to measure, material properties (for instance, fiber shear modulus G f and transverse tensile modulus E f,90 ) through curve fitting methods.…”

Section: Resultsmentioning

confidence: 99%

“…For jute‐epoxy composites, Cichocki and Thomason [11] measured G f and G c12 to be 3.5 GPa and 1.4 GPa, respectively. In a study by Ntenga et al [38] G c12 was measured to be 1.68 to 2.04 GPa for sisal–epoxy composites. Hence, the shear modulus of flax and its composite determined in this study are in agreement with other studies in literature.…”

Section: Resultsmentioning

confidence: 99%

“…11. [38] These observations are indicative of changes in failure mode with increasing off-axis loading angle. For low offaxis angles (h \ 58), the composite failure strain of 1.56% is close to the tensile failure strain of a single flax fiber.…”

Section: Fracture Strain and Fracture Modesmentioning

confidence: 96%

“…Kumar [37] tested jute-polyester composites only in three directions-0, 45, and 908. Although Ntenga et al [38] and Cichocki and Thomason [11] considered the effect of at least five off-axis angles other than 0 and 908, to investigate the (thermo-)elastic anisotropy of aligned PFCs they only measured elastic properties. Their studies focussed on the application of micromechanical models.…”

Section: Off-axis Loading Of Compositesmentioning

confidence: 99%

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The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

et al. 2012

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Composites in load‐bearing applications are often exposed to off‐axis loads. For plant fiber composites (PFCs) to be seriously and readily considered in structural applications, knowledge and reliable prediction of their response to off‐axis loads is critical. This article (i) characterizes the stress–strain response, (ii) investigates the tensile properties, and (iii) analyses the fracture modes, of unidirectional flax‐polyester composites subjected to off‐axis tensile loading. A key finding of this study is that due to the nonlinear stress–strain response of PFCs, the apparent stiffness of the composite reduces by ∼30% in the strain range of 0.05 to 0.25%. In addition, through cyclic tests on the composites, the elastic strain limit is found to be only ∼0.15%. This has major implications on the strain range to be used for the determination of the composite elastic Young's modulus. Consequently, it is proposed that the tensile modulus for PFCs should be measured in the strain range of 0.025 to 0.100%. Through comparison with experimental data, conventional composite micromechanical models are found to be adequate in quantitatively describing the tensile behavior of off‐axis loaded PFCs. The application of such models has also enabled the determination of, otherwise difficult to measure, material properties, such as fiber shear and transverse modulus. Off‐axis loaded PFCs fail by three distinct fracture modes in three different off‐axis ranges; each fracture mode produces a unique fracture surface. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Fracture Strain and Fracture Modesmentioning

confidence: 96%

Section: Off-axis Loading Of Compositesmentioning

confidence: 99%

See 2 more Smart Citations

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

et al. 2012

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“…Thomason expanded on these results to show that the anisotropy of these jute fibres, and specifically their low transverse and shear modulus, could fully explain the apparent low performance levels observed in the injection moulded jute-polypropylene composites [13,15]. Using similar methods, Ntenga et al [18] reported high levels of mechanical anisotropy in sisal fibres and reported values of 11.5 GPa, 1.4 GPa, and 0.1 GPa, respectively for the sisal fibre longitudinal, transverse and shear moduli. Baley et al [19] reported that the transverse modulus of flax fibres was 8 GPa, compared to a longitudinal modulus of 59 GPa.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the Anisotropic Thermoelastic Properties of Natural Fibres for Composite Reinforcement

Thomason

Yang

Gentles

2017

Fibers

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There has been a substantial increase in the investigation of the potential of natural fibres as a replacement reinforcement in the traditional fibre reinforced polymer composite application. However, many researchers often overlook the anisotropic properties of these fibres, and the estimation of the potential reinforcement performance. A full understanding of the thermoelastic anisotropy of natural fibres is important for realistically predicting their potential performance in composite applications. In this study, the thermoelastic properties of flax and sisal fibres were determined through a combination of experimental measurements and micromechanical modelling. The results confirm the high degree of anisotropy in properties of the flax and sisal fibres. The implications of these results on using natural fibres as an engineering composite reinforcement are discussed.

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Dependence of interfacial strength on the anisotropic fiber properties of jute reinforced composites

Thomason

2010

Polymer Composites

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The upsurge in research on natural fiber composites over the past decade has not yet delivered any major progress in large scale replacement of glass fiber in volume engineering applications. This article presents data on injection-molded jute reinforced polypropylene and gives a balanced comparison with equivalent glass reinforced materials. The poor performance of natural fibers as reinforcements is discussed and both chemical modification of the matrix and mercerization and silane treatment of the fibers are shown to have little significant effect on their level of reinforcement of polypropylene in comparison to glass fibers. A hypothesis is proposed to explain the poor performance of natural fibers relating their low level of interfacial strength to the anisotropic internal fibre structure

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Estimation of the elastic anisotropy of sisal fibres by an inverse method

Cited by 17 publications

References 9 publications

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

The tensile behavior of off‐axis loaded plant fiber composites: An insight on the nonlinear stress–strain response

Characterisation of the Anisotropic Thermoelastic Properties of Natural Fibres for Composite Reinforcement

Dependence of interfacial strength on the anisotropic fiber properties of jute reinforced composites

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