Development of novel green and biocomposite materials: Tensile and flexural properties and damage analysis using acoustic emission

Bravo, Alencar; Toubal, Lotfi; Koffi, Demagna; Erchiqui, Fouad

doi:10.1016/j.matdes.2014.10.026

Cited by 54 publications

(35 citation statements)

References 36 publications

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“…Tensile modulus of the composites was between 6 and 10 GPa while the Cellulose maximum elongation was about 2.1 %, which follow the results from our earlier studies (Ramamoorthy et al 2012(Ramamoorthy et al , 2013Esmaeili et al 2014). Further, acoustic emissions could be used to analyze microstructural damage analysis (Bravo et al 2015). Tensile strength and modulus increased when the fibers were treated with silane.…”

Section: Resultssupporting

confidence: 86%

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: Resultssupporting

confidence: 86%

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

et al. 2015

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“…The term 'biocomposite' is used when natural fibers are used as an alternative in making the composite whether it is the matrix material or the filler which are biofibers (e.g. lignocellulosic fibers) [15], [16].…”

Section: Quantifying the Tensile Properties Of Hevea Brasiliensis -Simentioning

confidence: 99%

Quantifying the Tensile Properties of Hevea brasiliensis – Silicone Biocomposite using Neo – Hookean Model

Haris¹,

Mahmud²

2019

IJRTE

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Incorporation of natural fibers into composites have been continuously researched in moving towards a greener environment. As environmental issues such as climate change and global warming is becoming severe, green technology is one of the ways to reduce it. Hevea brasiliensis or commonly called rubber tree produced a lot of sawdust during the conversion of the raw material into product. The sawdust is known as an agricultural waste which has no economic value. Therefore, this study for the first time attempts to utilize the Hevea brasiliensis sawdust by incorporating it with silicone rubber in the making of a new biocomposite material. The samples were prepared in two weight compositions, 0 wt% and 16 wt% in accordance to ASTM D412. Tensile properties of biocomposite was then determined using 3382 Universal Testing Machine 100kN (Instron, U.S.A., 2008). Neo Hookean hyperelastic model was employed where the material constant, C1 values were obtained. The graph plotted shows that the hyperelastic model used can mimic the deformation behavior of silicone biocomposites. The material constants are observed to increase as Hevea brasiliensis fiber are introduced into it. Hence, it can be concluded that pure silicone rubber has higher tensile strength compared to 16 wt% hevea brasiliensis – silicone biocomposite and the addition of fiber increase the stiffness properties of material produced.

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“…Energy is dissipated in the forms of hysteresis energy [8][9][10][11][12][13], thermal energy [14][15][16][17][18][19][20], and acoustic emissions (AE) [4,[21][22][23][24][25]. In the case of dissipated thermal energy, infrared technology enables one to monitor the temperature evolution over the life of the components.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, by extracting features from the measured signals (waveforms), it is possible to monitor the cumulative trend of degradation. Such an approach has been employed for qualitative damage assessment of a wide range of materials [22,24,25,34].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Entropy of the Materials in the Course of Degradation

Kahirdeh¹,

Khonsari²

2016

Entropy

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Abstract:We report experimental observations on the evolution of acoustic entropy in the course of cyclic loading as degradation occurs due to fatigue. The measured entropy is a result of the materials' microstructural changes that occur as degradation due to cyclic mechanical loading. Experimental results demonstrate that maximum acoustic entropy emanating from materials during the course of degradation remains similar. Experiments are shown for two different types of materials: Aluminum 6061 (a metallic alloy) and glass/epoxy (a composite laminate). The evolution of the acoustic entropy demonstrates a persistent trend over the course of degradation.

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Development of novel green and biocomposite materials: Tensile and flexural properties and damage analysis using acoustic emission

Cited by 54 publications

References 36 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 the Tensile Properties of Hevea brasiliensis – Silicone Biocomposite using Neo – Hookean Model

Acoustic Entropy of the Materials in the Course of Degradation

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