Processing of unidirectional hemp fiber reinforced composites with micro-braiding technique

Kobayashi, Satoshi; Takada, Keita

doi:10.1016/j.compositesa.2012.11.012

Cited by 47 publications

(20 citation statements)

References 24 publications

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“…A tubular braiding machine was used to produce micro-braid yarn using a continuous jute yarn inserted axially and a polymer yarn as the matrix material braided around the reinforcing jute thread [153]. This technology, illustrated in figure 6 (right), has also been used for hemp/PLA micro-braided yarn by Kobayashi et al [155].…”

Section: Cohesion By Wrapping/comingling/micro-braidingmentioning

confidence: 99%

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Specific features of flax fibres used to manufacture composite materials

et al. 2018

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The use of composite materials reinforced by flax fibres has been increasing steadily over the last 20 years. These fibres show attractive mechanical properties but also some particularities (naturally limited length, presence of a lumen, fibres grouped in bundles in the plant, complex surface properties and composition). An analysis of the available literature indicates that the quality of the composite materials studied is not always optimal (high porosity, incomplete impregnation, heterogeneous microstructure, variable fibre orientation). This paper reviews published data on the specific nature of flax fibres with respect to manufacturing of biocomposites (defined here as polymers reinforced by natural fibres). All the important steps in the process which influence final properties are analyzed, including the plant development, retting, fibre extraction, fibre treatment, preform preparation, available manufacturing processes, the impregnation step, fibre cell wall changes during processing and fibre/matrix adhesion.

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Section: Cohesion By Wrapping/comingling/micro-braidingmentioning

confidence: 99%

“…Left: warping staple natural fibres with a thread[111]. Right: Micro-braiding technology[155]. Below: DREF-3 spinning system[156][157] …”

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confidence: 99%

Specific features of flax fibres used to manufacture composite materials

et al. 2018

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“…The second step involved placement of the metallic frame containing intermediate material in a pre-heated molding die for consolidation by compression molding to produce composite specimens. Molding conditions of processing temperature 190 ºC, pressure 1MPa and time 4 min were selected, which was obtained the optimum condition in the previous study [9]. Static tensile strength of this specimen was 205 MPa.…”

Section: Experimental Methodsmentioning

confidence: 99%

Damage Behavior of Hemp Fiber Reinforced Poly(L-Lactic Acid) Composites under Fatigue Loading

Kobayashi

2013

JMMP

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Green composites, such as natural fiber reinforced naturally-derived plastics attract much attention because of reducing CO 2 emission. Many studies about green composites have enabled the materials substitutes as glass fiber reinforced composites. However, lack of investigations about fatigue properties restricts the actual usage of the composites. In the present study, we investigate fatigue properties of green composites. A hemp fiber yarn reinforced poly(lactic acid) composite was selected as a green composite. Unidirectional (UD) and textile (Textile) composites were fabricated using micro-braiding technique. Fatigue tests results indicated that fatigue damages in UD composites was splitting which occurred just before the final fracture, while matrix crack and debonding between matrix and fiber yarn occurred and accumulated stably in Textile composites. These results were consistent with modulus reduction and acoustic emission measurement during fatigue tests.

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“…As described above, many researches on resin impregnation behavior in FS, CY and Powder method could be confirmed. On the other hand, there are some researches about MB method (Sakaguchi et al 2000;Fujihara et al 2003;Kamaya et al 2001;Hung 2004;Kobayashi et al 2012a, b;Kobayashi and Tanaka 2012;Kobayashi and Takada 2013) for unidirectional composites, whereas the resin impregnation behavior for continuous woven materials has been limited (Kobayashi and Morimoto 2014;Kobayashi et al , 2017 because of their complexity. However, it is important to clarify the resin impregnation behavior for continuous woven material with superior in drape property compared to unidirectional material, considering actual usage of the composites (Kobayashi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental and analytical investigation on resin impregnation behavior in continuous carbon fiber reinforced thermoplastic polyimide composites

Kazano

Osada

Kobayashi

et al. 2018

Mech Adv Mater Mod Process

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In molding of carbon fiber reinforced thermoplastics (CFRTP), resin impregnation behavior to fiber yarns is very important because higher viscosity of molten thermoplastics inhibites resin impregnation to the interspace among fibers. Resultant resin un-impregnation causes lower mechanical properties of CFRTP. The purpose of this study was to clarify the relation among molding method, molding conditions and resin impregnation to fiber yarns experimentally and analytically. In this study, CFRTPs using continuous carbon fiber yarn as a reinforcement and a thermoplastic polyimide which is excellent in heat resistance as a matrix resin were produced by Micro-Braiding, Film Stacking and Powder method. In addition resin impregnation was modeled based on Darcy's law and continuity condition. As a result, analytical resin impregnation prediction showed good agreements with the experimental results in all the producing methods and molding conditions. In addition, the void content in the molded CFRP could be greatly reduced by pressurizing cooling.

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Processing of unidirectional hemp fiber reinforced composites with micro-braiding technique

Cited by 47 publications

References 24 publications

Specific features of flax fibres used to manufacture composite materials

Specific features of flax fibres used to manufacture composite materials

Damage Behavior of Hemp Fiber Reinforced Poly(L-Lactic Acid) Composites under Fatigue Loading

Experimental and analytical investigation on resin impregnation behavior in continuous carbon fiber reinforced thermoplastic polyimide composites

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