Physical and mechanical properties of unidirectional plant fibre composites—an evaluation of the influence of porosity

Madsen, Bo; Lilholt, Hans

doi:10.1016/s0266-3538(03)00097-6

Cited by 266 publications

(151 citation statements)

References 14 publications

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“…Due to these reasons, a closely packed nonwoven structure was chosen as reinforcement for a composite with a fiber volume percent between 42 and 45 %. The pore volume was 6.4 % when the untreated fabric was used as reinforcement and falls in line with previous study on porosity prediction resulted in porosity between 4 and 8 % (Madsen and Lilholt 2003). The high pore volume could be attributed to the poor fiber-matrix interface.…”

Section: Density and Porosity Measurementssupporting

confidence: 90%

“…These porous regions could initiate the delamination of the layers resulting in composite failure. A study based on natural fiber composites showed that the porosity increased at high fiber volume fraction (Madsen and Lilholt 2003). Due to these reasons, a closely packed nonwoven structure was chosen as reinforcement for a composite with a fiber volume percent between 42 and 45 %.…”

Section: Density and Porosity Measurementsmentioning

confidence: 99%

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Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin

et al. 2015

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The effect of surface treatments, silane and alkali, on regenerated cellulose fibers was studied by using the treated fibers as reinforcement in lactic acid thermoset bioresin. The surface treatments were performed to improve the physico-chemical interactions at the fiber-matrix interface. Tensile, flexural and impact tests were used as indicator of the improvement of the interfacial strength. Furthermore, thermal conductivity, viscoelasticity measurements as well as microscopy images were made to characterize the fiber surface treatments and the effect on adhesion to the matrix. The results showed that silane treatment improved the mechanical properties of the composites as the silane molecule acts as link between the cellulose fiber and the resin (the fiber bonds with siloxane bridge while the resin bonds with organofunctional group of the bi-functional silane molecule) which gives molecular continuity in the interphase of the composite. Porosity volume decreased significantly on silane treatment due to improved interface and interlocking between fiber and matrix. Decrease in water absorption and increase in contact angle confirmed the change in the hydrophilicity of the composites. The storage modulus increased when the reinforcements were treated with silane whereas the damping intensity decreased for the same composites indicating a better adhesion between fiber and matrix on silane treatment. Thermogravimetric analysis indicated that the thermal stability of the reinforcement altered after treatments. The resin curing was followed using differential scanning calorimetry and the necessity for post-curing was recommended. Finite element analysis was used to predict the thermal behavior of the composites and a non-destructive resonance analysis was performed to ratify the modulus obtained from tensile testing. The changes were also seen on composites reinforced with alkali treated fiber. Microscopy images confirmed the good adhesion between the silane treated fibers and the resin at the interface.

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Section: Density and Porosity Measurementssupporting

confidence: 90%

Section: Density and Porosity Measurementsmentioning

confidence: 99%

Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin

et al. 2015

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“…It became clear that the projected area of the voids in the transverse direction (or the area of the void in the 1-2 plane) was important to determining the stiffness. The plot in Figure 13 plots the transverse stiffness as a function of the area fraction, 3 a , which can be define as the ratio of the projected void area, a 3, to the total area of the 12 plane, A 3, and written as …”

Section: Transverse Stiffness Analysis and Resultsmentioning

confidence: 99%

“…where V v is the void volume fraction, E 3 is the change in trasverse stiffness due to the voids, and 3 a was defined in Equation (2). If 3 a and 3 3 E E  are small, the following approximation can be used:…”

Section: Transverse Stiffness Analysis and Resultsmentioning

confidence: 99%

Quantifying Effects of Voids in Woven Ceramic Matrix Composites

Goldsmith

Sankar

Haftka

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…This database will be used to develop a conceptual use model for testing biomass materials to estimate biomass performance in harvesting, handling, and processing systems. It is recognized that environmental conditions (i.e., temperature, humidity), stages of maturation, matrix composition, and cell matrix configuration are important test parameters to consider (16,17,18,19,20,21,22). For purposes of simplicity, this study primarily focuses on matrix composition and cell configuration in mature plant biomass for the determination of biomechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Biomechanics of Wheat/Barley Straw and Corn Stover

Wright

Pryfogle

Stevens

et al.

Twenty-Sixth Symposium on Biotechnology for Fuels and Chemicals

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SummaryThe lack of understanding of the mechanical characteristics of cellulosic feedstocks is a limiting factor in economically collecting and processing crop residues, primarily wheat and barley stems and corn stover. Several testing methods, including compression, tension, and bend have been investigated to increase our understanding of the biomechanical behavior of cellulosic feedstocks. Biomechanical data from these tests can provide required input to numerical models and help advance harvesting, handling, and processing techniques. In addition, integrating the models with the complete data set from this study can identify potential tools for manipulating the biomechanical properties of plant varieties in such a manner as to optimize their physical characteristics to produce higher value biomass and more energy efficient harvesting practices.Index Entries: Modulus of elasticity; biomechanics; wheat straw; corn stover; feedstock development.

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Physical and mechanical properties of unidirectional plant fibre composites—an evaluation of the influence of porosity

Cited by 266 publications

References 14 publications

Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin

Performance of biocomposites from surface modified regenerated cellulose fibers and lactic acid thermoset bioresin

Quantifying Effects of Voids in Woven Ceramic Matrix Composites

Biomechanics of Wheat/Barley Straw and Corn Stover

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