Papers by Keyword: Hand Lay-up Method

Abstract: Retracted article: In this study, the influence of silane coupling agent on the matrix/ fiber interface bonding and its effect to the mechanical properties of oil palm frond fiber reinforced polyester composites were investigated. Tensile and flexural properties of the composites were studied at 0 - 10.2 volume fraction (% fiber content). Results showed an increasing trend in tensile modulus while tensile strength and flexural strength reduced as the fiber content increased. Higher tensile modulus values were observed in silane treated fiber composites due to additional fiber/ matrix interaction and increment in polyester molecular chain mobility constraint. Reduction in tensile strength is caused by decrease in the matrix crystallinity and formation of stress concentration spots emerging from interface discontinuity. These obstructions, however, were reduced by fiber surface modification, which improved the tensile strength. Enhanced fiber dispersion upon surface modification was unveiled through scanning electron micrograph images.

Abstract: In this study, fabrication of flax-abaca hybrid composites is done using hand lay-up technique. The arrangement of the composite is such that a layer of flax fiber is mounted on both sides by abaca fiber layers. Glass fiber reinforced polymer is used for lamination on both sides. Mechanical characterisation is done by performing tensile test on the hybrid composites. The tensile behaviour is compared with those of composites containing any one of the constituents of the hybrid composites. Morphological analysis of the specimen after testing is performed.

Abstract: Recent growth in the field of engineering demands specialised composite materials to meet various industrial needs. Composite materials are emerging as the most promising new materials. This paper deals with the fabrication and analysis of flexural characteristics of flax and Abaca hybrid epoxy composite. The show that GFRP + Flax +Abaca based hybrid composite has a higher ultimate stress which is much greater than GFRP + Flax composite and GFRP + Abaca composites. The inner filament breakage and crack propagation are studied using scanning electron microscope.

Abstract: In the present scenario, composites are beginning to play a major role in day to day applications. Suitable properties can be imparted by selection or orientation of fibers during the manufacturing process. This paper demonstrates the natural composites made up of Manila as reinforcing agent with epoxy resin as matrix enclosed between glass fibers. Glass fibers, also known as woven rovings, are used to improve the surface finish and provide better strength and rigidity to the composite. Using hand lay-up method, fibers of Manila are arranged in alternate layers. The strength of composites depends on the fiber-matrix interfacial bonding. Three composite samples are prepared and mechanical stability of the composite is determined by tensile test. It is seen that there is not much variation in the ultimate strength of the three samples. On an average, it is found that average break load of the composite is 4.8 KN and the corresponding displacement is 9.08 mm. All the three samples exhibit almost similar elongation of about 18 % and the average ultimate tensile strength is 31.66 MPa. The reason for uniform tensile properties is due to a homogeneous distribution of fibers in all the three samples.

Abstract: The Natural fiber composites form a combination of plant derived fibers with plastic binders (Polymer matrices). The fibers form the fillers or reinforcements of the composite and the matrix is the continuous phase. In general, fibers are principal load carrying members while the surrounding matrix keeps them in the desired position, acts as a load transfer medium between them. So fibers with good strength and modulus and having good bonding with matrix should be used to a produce a good quality composite material [1-3]. The mechanical efficiency of a fiber composite depends on the adhesion between the matrix and the reinforcement [4-7]. This paper is to evaluate impact and compression properties of pineapple fiber based reinforced composite with epoxy resin as matrix.

Abstract: Recently, composites are widely used for interior panel of the transportation facilities such as railway vehicle, ships and aircraft, etc. These interior composites panels are often made by vacuum bagging, hand lay-up method and autoclave, etc. In this study, we carried out tests for the evaluation of material properties of the panels under more severe conditions than real environment to evaluate the dimension stability of the interior composite panels. Two sets of panels, one made by hand lay-up method with glass mat/polyester resin (Type 1), and the other, by vacuum bagging method with epoxy prepreg/NOMEX (Type 2) are exposed to the low temperature, high temperature and room temperature. And then we measured the dimensions of the strained panels. To monitor the characteristics of cured resin, we used DSC (Differential Scanning Calorimeter). It was observed that Type 2 has higher mechanical properties and dimensional stability than Type 1.