Showing papers by "Mohd Zulkefli Selamat published in 2017"
TL;DR: In this article, the authors discussed the use of fibres from the oil palm empty fruit bunch (OPEFB) to be an alternative natural acoustic material for lower frequencies, this can be achieved by introducing air cavity gap behind the fibre samples.
91 citations
TL;DR: In this paper, the density and tension-tension fatigue performances of thermoplastic-based fiber metal laminate structures with different hybrid layups are investigated. And the results show that a hybrid laminate system with kenaf/glass/kenaf composite construction had better performance than other layups.
Abstract: Increasing the knowledge about the fatigue performance of thermoplastic-based fibre metal laminate is crucial for further extending their applications. In this study, the density and tension-tension fatigue performances of laminate structures with different hybrid layups are investigated. The fibre metal laminate structure is formed by bonding the composite laminate to annealed aluminium 5052 by using polypropylene adhesive through the hot press moulding compression method. The fatigue test was conducted at force controlled constant amplitude loading in accordance with ASTM E466. The results show that hybrid composite laminates layups of kenaf/glass/kenaf reinforced metal laminate improve the tensile and fatigue strength by 9%, compared to composite laminates layups of kenaf/kenaf/kenaf fibre reinforced metal laminate. Meanwhile, the hybrid composite laminates layups of glass/kenaf/glass reinforced metal laminate show an increase in tensile strength and fatigue strength by 30% and 4% respectively. In terms of fatigue sensitivity, a hybrid laminate system with kenaf/glass/kenaf composite construction had better performance than other layups.
15 citations
01 Jan 2017
TL;DR: In this article, the authors modify the mechanical properties of pure corn starch by mixing it with water, glycerol and vinegar, and the results showed that the best mixture composition is selected based on the visual impaction, hardness and density.
Abstract: The use of natural fiber as reinforcement in polymeric composites has been seen a dramatically increase over the last decades. The surge in the interest of natural fiber composite or biodegradable composite is mainly due to the attractive cost of production, improved of hardness, better fatigue endurance and good thermal and mechanical resistivity. In this work, corn starch in the form of powder is utilized as the matrix of the composite. However, starch is brittle and has low strength make it inappropriate candidate for matrix binder. The main objective of this study is to modify the mechanical properties of pure corn starch by mixing it with water, glycerol and vinegar. The composition ratio of water is 60~80%, corn starch 10~35%, glycerol is 5~15% and vinegar is 0~5%, ten samples (A-J) have been manufactured and the best mixture composition is selected based on few selection criteria. The selection criteria are visual impaction, hardness and density. From the results, the samples without vinegar are not suitable to be used because of the fungus availability on the surface. Meanwhile the results from the samples with 5 ml vinegar have no fungus on their surface even has been exposed to the ambient air. While the sample C has shown the best sample based on the visual, hardness and density test.
2 citations
01 Jan 2017
TL;DR: In this article, the effect of temperature and preload moment on the bearing strength of woven kenaf-glass fiber reinforced polypropylene hybrid composite was studied and the results revealed that increase in the ambient temperature reduced the bolted joint strength whereas the increase in pre load moment improved the joint strength.
Abstract: Composite material is gaining a large attention in these few years due to its high strength to weight ratio. The cost of composite is also relatively lower than conventional metallic alloy. Several previous studies had shown introducing of synthetic fibre in the natural fibre-based composite polymer can enhance the mechanical strength of the composite structure. This research paper studies the effect of temperature and preload moment on the bearing strength of woven kenaf-glass fibre reinforced polypropylene hybrid composite. The kenaf fibre and E-glass fibre are in the form of plain weave fabric. Composite specimens were manufactured through hot press moulding compression method at 180oC. In bolted joint test, specimens were exposed to a temperature of 25oC (room temperature), 40oC, 50oC, and 60oC and tightened with 0Nm, 5.2Nm and 7.5Nm preload moment. Bearing response under different conditions was tested according to ASTM D5961 standard procedure and failure modes were observed. The results revealed that increase in the ambient temperature reduced the bolted joint strength whereas the increase in preload moment improved the joint strength.
2 citations