Stress relaxation in short sisal‐fiber‐reinforced natural rubber composites

Varghese, Siby; Kuriakose, Baby; Thomas, Sabu

doi:10.1002/app.1994.070530807

Cited by 115 publications

(50 citation statements)

References 19 publications

(4 reference statements)

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“…Particles (both passive and active) are often immersed in fluids that are non-Newtonian (e.g., polymer-filled materials [4,14], spermatozoa swimming through the viscoelastic cervical mucus [15], bacteria in cross-linked polymer gels [16]). The complexity of the suspending liquid strongly alters the observed particle dynamics with respect to that with a Newtonian fluid in analogous flow conditions.…”

Section: Gadavino@uninaitmentioning

confidence: 99%

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

et al. 2014

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The motion of an ellipsoidal particle in a viscoelastic liquid subjected to an unconfined shear flow is addressed by numerical simulations. A complex dynamics is found with different transients and long-time regimes depending on the Deborah number De (De is the product of the viscoelastic liquid intrinsic time times the applied shear rate). Spiraling orbits toward a log-rolling motion around the vorticity are observed for low Deborah numbers, whereas the particle aligns with its major axis near to the flow direction at high Deborah numbers. The transition from vorticity to flow alignment is characterized by a periodic regime with small amplitude oscillations around orientations progressively shifting from vorticity to flow direction by increasing De. A range of Deborah numbers is detected such that the periodic solution coexists with the flow alignment regime (bistability). A further range of De is found where flow alignment is attained differently for particles starting far from or next to the shear plane: in the latter case, very long transients are found; hence an effective bistability (metabistability) is predicted to occur in a large time lapse before reaching the fully aligned state. Finally, the computed Deborah number values for flow alignment favorably compare with available experimental data. © 2014 American Physical Society

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Section: Gadavino@uninaitmentioning

confidence: 99%

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

et al. 2014

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“…However, studies on composites containing plant fibres are important because of their renewable nature, low cost and amenability to chemical and mechanical modifications. A considerable amount of research work has been reported on plant fibre reinforced elastomer composites (Bhagavan et al, 1987;Varghese et al, 1992Varghese et al, ,1994Geethamma et al, 1995. Coran et al (1974 have studied the properties of cellulosic fibre-elastomer composites and found that aspect ratio of the fibre has a major role on composite properties.…”

Section: Sisal Fibre Reinforced Rubber Compositesmentioning

confidence: 99%

“…They concluded that in general, the mechanical properties of the composites in the longitudinal direction were superior to those in the transverse direction, the optimum length for coir fibre in natural rubber system was found to be 10 mm in order to achieve good reinforcement in natural rubber composites; in order to achieve maximum tensile properties, coir fibre should be immersed in 5% sodium hydroxide solution for 48 h; anisotripic swelling studies indicated the poor adhesion between untreated coir fibre and natural rubber; the swelling was found smaller in composites containing alkali treated coir fibre along with the resorcinol-hexamethylene tetramine bonding agent. Varghese et al (1992) have studied the mechanical properties of acetylated and untreated short sisal fibre reinforced natural rubber composites and found that acetylation improves the adhesion between the rubber and the fibre. They have investigated the effect of different bonding agents on the physical and mechanical properties of sisal fibre reinforced natural rubber composites.…”

Section: Sisal Fibre Reinforced Rubber Compositesmentioning

confidence: 99%

A Review on Sisal Fiber Reinforced Polymer Composites

Joseph

Filho

James³

et al. 1999

Rev. bras. eng. agríc. ambient.

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267

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The global demand for wood as a building material is steadily growing, while the availability of this natural resource is diminishing. This situation has led to the development of alternative materials. Of the various synthetic materials that have been explored and advocated, polymer composites claim a major participation as building materials. There has been a growing interest in utilizing natural fibres as reinforcement in polymer composite for making low cost construction materials in recent years. Natural fibres are prospective reinforcing materials and their use until now has been more traditional than technical. They have long served many useful purposes but the application of the material technology for the utilization of natural fibres as reinforcement in polymer matrix took place in comparatively recent years. Economic and other related factors in many developing countries where natural fibres are abundant, demand that scientists and engineers apply appropriate technology to utilize these natural fibres as effectively and economically as possible to produce good quality fibre reinforced polymer composites for housing and other needs. Among the various natural fibres, sisal is of particular interest in that its composites have high impact strength besides having moderate tensile and flexural properties compared to other lignocellulosic fibres. The present paper surveys the research work published in the field of sisal fibre reinforced polymer composites with special reference to the structure and properties of sisal fibre, processing techniques, and the physical and mechanical properties of the composites.Key words: sisal fibre, polymer, composites, structure, properties COMPÓSITOS POLIMÉRICOS REFORÇADOS COM FIBRAS DE SISAL RESUMOO uso da madeira como material de construção continua crescendo mundialmente enquanto a disponibilidade deste recurso natural está diminuindo. Esta situação tem conduzido ao desenvolvimento de materiais alternativos. Dentre os vários materiais sintéticos que têm sido explorados, os compósitos poliméricos reivindicam e buscam uma maior participação como material de construção. Nos últimos anos tem se observado um crescente interesse na utilização de fibras naturais como reforço de matrizes poliméricas para a produção de materiais de baixo custo. As fibras naturais são reforços com grande potencialidade e seu uso tem se dado de forma mais tradicional do que científica. Elas têm se prestado a inúmeras aplicações ao longo do tempo, mas a aplicação da tecnologia dos materiais visando a sua utilização como reforço de matrizes poliméricas é relativamente recente. As dificuldades econômicos e sociais observadas em muitos dos países em desenvolvimento, onde as fibras naturais são abundantes, requerem que cientistas e engenheiros apliquem tecnologias apropriadas para utilizar estas fibras da forma mais eficiente possível, de tal maneira que se possa produzir materiais compósitos poliméricos de boa qualidade visando a atender a demanda da população por habitações e componentes habi...

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“…due to complex geometries), of joining cured parts of a structure or even for repairing purposes. Natural fibres like flax, henequen, sisal, coconut, jute, palm, bamboo, wood or paper have been used as reinforcement in thermosetting and thermoplastic resin composites [7]. Compared to typical fibre composites, e.g.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness determination of adhesive and co-cured joints in natural fibre composites

Campilho

Moura

Gonçalves

et al. 2013

Composites Part B: Engineering

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a b s t r a c tAdhesive bonding has become more efficient in the last few decades due to the adhesives developments, granting higher strength and ductility. On the other hand, natural fibre composites have recently gained interest due to the low cost and density. It is therefore essential to predict the fracture behavior of joints between these materials, to assess the feasibility of joining or repairing with adhesives. In this work, the tensile fracture toughness (G c n ) of adhesive joints between natural fibre composites is studied, by bonding with a ductile adhesive and co-curing. Conventional methods to obtain G c n are used for the co-cured specimens, while for the adhesive within the bonded joint, the J-integral is considered. For the J-integral calculation, an optical measurement method is developed for the evaluation of the crack tip opening and adherends rotation at the crack tip during the test, supported by a Matlab sub-routine for the automated extraction of these quantities. As output of this work, an optical method that allows an easier and quicker extraction of the parameters to obtain G c n than the available methods is proposed (by the J-integral technique), and the fracture behaviour in tension of bonded and co-cured joints in jute-reinforced natural fibre composites is also provided for the subsequent strength prediction. Additionally, for the adhesively-bonded joints, the tensile cohesive law of the adhesive is derived by the direct method.

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Stress relaxation in short sisal‐fiber‐reinforced natural rubber composites

Cited by 115 publications

References 19 publications

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

Bistability and metabistability scenario in the dynamics of an ellipsoidal particle in a sheared viscoelastic fluid

A Review on Sisal Fiber Reinforced Polymer Composites

Fracture toughness determination of adhesive and co-cured joints in natural fibre composites

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