Investigation On Mechanical Behaviour Of Light Weight Woven Kenaf Fibre Reinforced Polypropylene-Aluminium Fibre Metal Laminate
Composite has been widely use in many industries especially in aeronautic and automotive due to superior mechanical properties of composite such as light weight and high specific strength. The concern about environmental impact of emission from automobiles and uncertainty in fuel price has attracted...
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| 总结: | Composite has been widely use in many industries especially in aeronautic and automotive due to superior mechanical properties of composite such as light weight and high specific strength. The concern about environmental impact of emission from automobiles and uncertainty in fuel price has attracted many researchers to replace the use of monolithic metal in structural application of vehicle skin. Thus, the manufacturing of a light weight fibre metal laminate (FML) is potential to solve the problems since weight reduction of globally used vehicles helps in reducing energy consumption and CO2 emissions coupled with safety. The aim of this research is to investigate the mechanical properties of natural fibre FML through different parameters. Panels of woven kenaf fibre reinforced polypropylene-aluminium FML (WK/PP-aluminium FML) were fabricated by sandwiching 0.5 mm thin metal sheet of aluminium 6061-0 and 2 mm thickness of woven kenaf fibre reinforced polypropylene composite with different FML configuration determined by different layer of woven fibre (one layer (1L), two layers (2L) and three layers (3L)) and different fibre angle orientation (0/90° and 45/-45°). The experimental study on mechanical properties of FML were tested under tensile (ASTM D3039), flexural (ASTM D790), quasi static indentation, QSI (ASTM D6264), and low velocity impact, LVI (ASTM D3763) test to investigate the performance of the FMLs. The first objectives of the study is to investigate the effect of alkaline treatment of the fibre and were tested under tensile. The result obtained prove that treated fibre helps to improve tensile strength by 26.56% compared to the untreated fibre. Then, the following mechanical testing were conducted using FML with only treated fibre. The overall results shows that 3L FML outperformed the other FML which exhibited maximum load, strength, modulus and energy absorbed since it consists of optimum fibre content in WK/PP composite. On the other hand, the FML depicted that the increase in fibre layer results in reduction in elongation for all testing due to increase in stiffness. The FML with 45/-45° angle gives greater elongation than 0/90° angle orientation due to trellis effect. In comparison between fibre angles, tensile and flexural result shows that 0/90° is higher than 45/-45°. The QSI and LVI test were conducted using small and large indenter with diameter size of 12.7 mm and 20 mm. The results shows that FML with 45/-45° fibre angle offers more impact resistance compared to 0/90°. The trellis effect is significant in the 45/−45° angle orientation contributing to more energy to be absorbed. The large indenter gives higher properties than small indenter for both testing due to larger contact surface area which require more load and provides more energy absorbed. Besides, the failure mechanism of tensile and flexural were both demonstrated by visible composite fracture and aluminium fracture. The damage in QSI and LVI seems to have similar type of failure since all FML sample were completely perforated. In conclusion, the results obtained for WK/PP-aluminium FML shows a good mechanical properties and have a high potential to be use in related applications. |
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