Low-velocity impact responses of Napier fibre/polyester composites

Fahmi, Ichsan; Majid, M.S. Abdul; Afendi, M.; Helmi, E.A.; Haameem, J.A. M.

doi:10.15282/ijame.13.1.2016.9.0269

Cited by 15 publications

(8 citation statements)

References 31 publications

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“…The choice of constituent materials depends mainly on the specific application and design criteria of the sandwich panel products [1]. The most outstanding benefit of this type of composite structure is its high strength and stiffness to weight ratio [2][3][4][5][6][7][8]. On the other hand, this typical structure also has a few drawbacks; they suffer from strong stress concentration at the interfaces between the face sheets, the weak adhesive layer, and the core, as a consequence of the distinctly different properties of these materials in contact [9].…”

Section: Introductionmentioning

confidence: 99%

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Fajrin¹,

Zhuge²,

Bullen³

et al. 2016

J. MECH. ENG. SCI.

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Polymeric composites reinforced with natural fibers have raised more attention as the alternative building materials. In this work, natural fiber composites prepared from jute and hemp fiber were proposed for the intermediate layer of a hybrid sandwich panel. This paper presented the flexural behavior of the newly developed hybrid sandwich panel which included the comparison of the ultimate load, load-deflection behavior, load-strain behavior and failure modes. The study was designed as a single factor experiment where the performance of hybrid sandwich panels containing jute fiber composite (JFC) and hemp fiber composite (HFC) as the intermediate layer was compared to the control (CTR) which was a conventional sandwich panel without an intermediate layer. A static flexural test under a four-point bending load scheme was performed in accordance with the ASTM C 393-00 standard. Aluminium sheet was used as the skins, while expanded polystyrene (EPS) was employed for the core. The testing was performed using a 100 kN servohydraulic machine with a loading rate of 5 mm/min. The applied load, displacement and strains were obtained using data logger. The results demonstrated that the hybrid sandwich panel exhibited a more superior performance than the conventional sandwich panels. The intermediate layer contributed significantly to enhancing the load carrying capacity of the hybrid sandwich panel. The load carrying capacity of hybrid panel with the JFC intermediate layer was 29.60% higher than the conventional sandwich panel, and correspondingly 93.46% higher for the sandwich panel with the HFC intermediate layer.The hybrid sandwich panels also developed a much larger area under the load-deflection curve, indicating greater toughness. The introduction of intermediate layer helped the hybrid sandwich panels to sustain a larger strain prior to reach their ultimate loads, resulting in a higher deformation capability. Indentation and core shear were observed as the failure mode of the conventional sandwich panel. Meanwhile, core shear and delamination were identified as the failure mode of the hybrid sandwich panel.

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Section: Introductionmentioning

confidence: 99%

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Fajrin¹,

Zhuge²,

Bullen³

et al. 2016

J. MECH. ENG. SCI.

View full text Add to dashboard Cite

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“…Conducting polymer composites (CPC) as bipolar plates are an attractive alternative to pure graphite and metal bipolar plates. CPCs have the capability to provide the necessary properties such as electrical and thermal conductivity while offering good mechanical strength to support the forces within the stack, even at a reduced plate thickness [6][7][8]. Nonetheless, the properties of CPC must meet the DoE target as shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a flow channel for the production of polymer composite bipolar plates through hot compression molding

et al. 2017

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Materials used to fabricate polymer electrolyte membrane fuel cell (PEMFC) bipolar plates need to be light, strong, cheap, easily fabricated, mechanically stable, and have low surface contact resistance. Additionally, the performance of PEMFCs is greatly influenced by the materials used, flow channel design and shape to be fabricated on the bipolar plate surface. In this study, the fabrication of a flow channel through the hot compression molding method was developed. All materials used were in powder form, with graphite (G), carbon black (CB) and ferum (Fe) as fillers, and polypropylene (PP) acting as binder. The ratio of fillers (G/CB/Fe) to binder (PP) was fixed at 80:20. The fillers ratio was fixed in the range of (25 to 65 wt%) G, (10 to 30 wt%) CB and (5 to 25 wt%) Fe, and all fillers were mixed using a ball mill machine. The second stage of the mixing process involves the mixing of fillers and a binder, which was mixed using a internal mixer machine. Subsequently, the compaction process through hot compression molding was carried out. During the hot compression molding process, the flow channel of serpentine type, and U or V shapes were pressed onto the surface of the sample. The in-plane electrical conductivity and mechanical properties such as flexure strength, bulk density and shore hardness were then measured. Thus, a flow channel was investigated for accuracy of surface condition of flow channel dimensions (using a coordinate measurement machine), and subsequently compared with the actual drawings and its process ability. Based on electrical conductivity, flexure strength, bulk density and shore hardness, the sample with 15 wt% Fe was shown to yield the best results of 137.39 S/cm 3 , 34.04 MPa, 1.582 g/cm 3 , and 53.14 respectively. Meanwhile, based on the analysis of flow channel dimensions, the V shape is shown to give a smooth surface, with a dimensions difference between samples and the drawing of about -0.118 to 0.27%. Meanwhile, for the process ability, the V shape is much easier to release from the mold. In summary, this study revealed that the flow channel with V shape can be fabricated through the hot compression molding method with high accuracy.

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“…Natural fibres (NFs) possesses a number of benefits which add values to polymer composites in terms of strength, structural flexibility, light weight, renewability and cost reduction [1][2][3][4][5][6][7][8]. In addition, environmental sustainability and reduced demand of polymer are also considered as significant impacts of using them with polymer matrices [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The variations in properties are also claimed as a function of fibre loading and aspect ratio [24]. Polyester from among the thermosetting resins is used for composite preparation [24,25]. They are important in hand lay-up technique for easy fabrication of the composites.…”

Section: Introductionmentioning

confidence: 99%

Effects of reinforcing arrangement of kenaf fibres into unsaturated polyester for improved properties

Islam¹,

Beg²

2016

J. MECH. ENG. SCI.

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In this current study, the mechanical, structural and morphological properties of kenaf fibre based polyester composites based on reinforcing arrangement were investigated. Fibres were placed in layers into the resin to enhance reinforcement. A hand lay-up technique was used to prepare the sandwich composite. Composites were characterized by tensile, flexural and impact testing. The structural properties as well as crystalline behaviour were observed by X-ray diffraction analysis. Additionally, the surface of the fractured samples was also examined using scanning electron microscopy to understand the interaction behaviour between the fibres and matrix. Results of the analyses revealed that single layered kenaf mat enhanced the tensile strength by 80%, whereas the double layered improved by 156%, in the presence of a fixed amount of curing agent. The thermal properties of the composites based on double layered kenaf mat were also found to improve compared to the others. The double layered composites can be used as high temperature-sustained roofing materials to replace traditional products.

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Low-velocity impact responses of Napier fibre/polyester composites

Cited by 15 publications

References 31 publications

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Flexural behaviour of hybrid sandwich panel with natural fiber composites as the intermediate layer

Fabrication of a flow channel for the production of polymer composite bipolar plates through hot compression molding

Effects of reinforcing arrangement of kenaf fibres into unsaturated polyester for improved properties

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