Mechanical separation of kenaf for composite applications – Evaluation of the total fibre line concept for field retted kenaf

Müssig, J.; Enke, S.; Gusovius, H.; Lühr, C.; Uhrlaub, B.; Dammer, L.; Carus, M.

doi:10.1016/j.indcrop.2023.117870

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Toughness, however, is limited due to the low ductility of the fibres [ 2 ]. Kenaf ( Hibiscus cannabinus L.) [ 3 ] is widely used for door panels and other interior trim units in automotive applications [ 4 ] and many other structural applications [ 5 , 6 ]. The quality of a fibre-reinforced composite is significantly influenced by the processing method, the matrix used, the fibre content, the semi-finished product used (like multilayer fibre web or needle felt, fabric, short fibres or roving), the fibre quality itself, and other criteria [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

A Bio-Inspired Approach to Improve the Toughness of Brittle Bast Fibre-Reinforced Composites Using Cellulose Acetate Foils

Graupner,

Müssig

2024

Biomimetics

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Bast fibre-reinforced plastics are characterised by good strength and stiffness but are often brittle due to the stiff and less ductile fibres. This study uses a biomimetic approach to improve impact strength. Based on the structure of the spicules of a deep-sea glass sponge, in which hard layers of bioglass alternate with soft layers of proteins, the toughness of kenaf/epoxy composites was significantly improved by a multilayer structure of kenaf and cellulose acetate (CA) foils as impact modifiers. Due to the alternating structure, cracks are deflected, and toughness is improved. One to five CA foils were stacked with kenaf layers and processed to composite plates with bio-based epoxy resin by compression moulding. Results have shown a significant improvement in toughness using CA foils due to increased crack propagation. The unnotched Charpy impact strength increased from 9.0 kJ/m2 of the pure kenaf/epoxy composite to 36.3 kJ/m2 for the sample containing five CA foils. The tensile and flexural strength ranged from 74 to 81 MPa and 112 to 125 MPa, respectively. The tensile modulus reached values between 9100 and 10,600 MPa, and the flexural modulus ranged between 7200 and 8100 MPa. The results demonstrate the successful implementation of an abstract transfer of biological role models to improve the toughness of brittle bast fibre-reinforced plastics.

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Section: Introductionmentioning

confidence: 99%

A Bio-Inspired Approach to Improve the Toughness of Brittle Bast Fibre-Reinforced Composites Using Cellulose Acetate Foils

Graupner,

Müssig

2024

Biomimetics

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Exploring the synergistic effects of graphene on the mechanical and vibrational response of kenaf/pineapple fiber‐reinforced hybrid composites

Dhilipkumar,

Arunpandian,

Arumugam

et al. 2024

Polymer Composites

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The automotive, aerospace, and sports industries are increasingly utilizing hybrid composites made from natural fiber reinforcements. This study evaluated the performance of a composite made from kenaf and pineapple fibers, manufactured using the compression molding process, with graphene nanoparticles added at varying weight concentrations of 0.5, 1.0, 1.5, and 2.0 wt%. Results showed that adding 0.5 wt% graphene increased the tensile, flexural, and impact strength of hybrid composite by 133.75%, 90.24%, and 25.67%, respectively. Microstructural analysis revealed that graphene integration has enhanced the interfacial bond between the fiber and the matrix, creating resin‐rich areas. Furthermore, the free vibrational analysis indicated that graphene‐infused composites exhibited higher natural frequencies, improving their energy‐absorbing capabilities. Water absorption tests demonstrated that the inclusion of graphene reduced water penetration by improving interfacial bonding, minimizing voids, and decreasing surface energy, which limited water pathways in the composite. Furthermore, the composites with 0.5 wt% graphene showed a contact angle of 80.8°, indicating lower hydrophilicity compared to neat composites, which had a contact angle of 70.7°. This research emphasizes the advantages of hybrid composite materials derived from kenaf and pineapple fibers, specifically for applications in vehicle interiors and construction, including wall panels and separators.Highlights Hybrid composite was prepared using the compression molding process. Adding 0.5 wt% graphene improved the mechanical properties of composites. Hybrid composites with lower wt% graphene had higher natural frequencies. The composites with 0.5 wt% graphene had better water absorption properties.

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Analysis of a Mechanism Used to Operate an Oscillating Separator

Mosnegutu,

Bibire,

Chitimuș

et al. 2024

Applied Sciences

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This article presents a comparative study of two different kinds of processes that produce oscillatory motion on a work surface during the mechanical separation process. The investigation began with determining the trajectory produced by the oscillating separator’s active component of the classical drive mechanism. Based on this, a second mechanism—the six-bar mechanism—was created using the WATT program, and a mathematical analysis was conducted. The comparative examination of the two mechanisms was carried out using OriginPro, Mathcad, and Roberts software. This study’s findings all point to the same conclusion: the newly developed mechanism produces the same trajectory as the classical mechanism when viewed through the lens of the reference element, or the element that causes the oscillatory movement. However, when looking at the operating parameters, there was a noticeable difference in the movement’s speed and the angle of the crank when producing its maximum speed. Theoretically, this new mechanism increases the speed at which solid particles move across a work surface. However, this difference cannot be characterized as positive or negative because further research is required to determine how the nature of solid particles and the work surface’s inclination affect this process, in addition to this mechanism. The identification of the mathematical equations of motion for the constituent parts of the mechanism under study is the novelty produced of this paper.

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Mechanical separation of kenaf for composite applications – Evaluation of the total fibre line concept for field retted kenaf

Cited by 3 publications

References 16 publications

A Bio-Inspired Approach to Improve the Toughness of Brittle Bast Fibre-Reinforced Composites Using Cellulose Acetate Foils

A Bio-Inspired Approach to Improve the Toughness of Brittle Bast Fibre-Reinforced Composites Using Cellulose Acetate Foils

Exploring the synergistic effects of graphene on the mechanical and vibrational response of kenaf/pineapple fiber‐reinforced hybrid composites

Analysis of a Mechanism Used to Operate an Oscillating Separator

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