Nov 27, · PhD thesis, University of Sheffield. Abstract A finite element code has been developed at the University of Sheffield to simulate the structural response of steel and composite At we have a team of MA and Phd Thesis On Composite Materials Pdf PhD qualified experts working tirelessly to provide high quality Phd Thesis On Composite Materials Pdf customized writing solutions to all your assignments including essays, term papers, research papers, dissertations, coursework and projects Jul 30, · Lee, Ching Hao () FIRE RETARDANT BEHAVIOR OF KENAF FIBRE REINFORCED FLOREON COMPOSITE. PhD thesis, University of Sheffield. Abstract. According to the report, more than 41% of fatalities in flight were to find to be caused by fire. In recent years, composites used in aircrafts are carbon fibre/ glass fibre reinforced epoxy, due to light
FIRE RETARDANT BEHAVIOR OF KENAF FIBRE REINFORCED FLOREON COMPOSITE - White Rose eTheses Online
PhD thesis, University of Sheffield. However, these composites are known as highly flammable. Serious fire incident will be created in a short time after a spark of fire. Furthermore, ingredients for fibre and epoxies are, composite phd thesis, toxic and resulting in the release of toxic gases during fire, and cutting off fresh air to survivors and hindering their escape.
In the meantime, biopolymers have attracted considerable attention due to their environmentally friendly and sustainable nature, Kenaf Fibre KF is one of the most composite phd thesis natural fibre used as a reinforcement in Polymer Matrix Composites PMC, composite phd thesis. Kenaf is also known as Hibiscus Cannabimus L. However, the inherent drawbacks associated with Floreon FLO based composites include brittleness, lower strength and high moisture sensitivity, which in turn limit their application in the aircraft industry.
In order to overcome such drawbacks, two modification techniques were employed in this study: 1 incorporated kenaf fibre into polypropylene polymer with magnesium hydroxide flame retardant and 2 reinforces kenaf fibre and magnesium hydroxide by different combination of volume. Consequently, KF reinforced FLO or polypropylene PP composites with magnesium hydroxide MH flame retardant specimens were successfully developed using extrusion followed by hot pressing.
The increment of Composite phd thesis contents in PP composites had shown higher tensile modulus and decomposed mass loss at onset temperature, but lower values in tensile strength, elongation, flexural composite phd thesis and onset temperature. Furthermore, increasing the KF contents in PP matrix has found lower mass residue.
However, increasing of KF contents in MH contented composite had increased the mass residue at the end of the testing. On the other hand, the increment of the melt flow properties MVR and MFR was found for the KF or MH insertion, due to the hydrolytic degradation of the polylactic acid PLA in FLO. The deterioration of the entanglement density at high temperature, shear thinning and wall slip velocity were the possible causes for the higher melt flow properties, composite phd thesis.
In the meantime, increasing the KF loadings caused the higher melt flow properties while the FLO composites with higher MH contents created stronger bonding for higher macromolecular chain flow resistance, hence, recorded lower melt flow properties. The high probability of KF-KF and KF-MH collisions was expected and there were more collisions for higher fibre and filler loading, composite phd thesis lower melt flow properties.
Besides that, insufficient resin for fibre wetting, hydrolytic degradation on the biopolymer and poor interfacial bonding were attributed to low strength profile. Yet, further addition of KF increased the tensile strength and flexural.
Nevertheless, inserting KF and MH filler have shown positive outcome on flexural modulus. Insertion of KF and MH showed the deterioration of impact strength, while the addition of KF increased the impact strength, composite phd thesis.
Meanwhile, FLO is a hydrophobic biopolymer which showed only a little composite phd thesis total water absorption, composite phd thesis. In this regard, for the first 24 hours, the water absorption rates were high for all bio-composites.
Hence, it is worth mentioning that the high contents of KF in bio-composites shown higher saturation period and higher total amount of water absorption while Composite phd thesis caused shorter saturation period but lower total amount of water absorption. The MH filler was found to be more significant in enhancing mass residual.
The Tg were show deterioration for all samples compared to pure FLO biopolymer. The melting temperature has found no meaningful change for either insertion of KF or MH or both. The values of co-coefficient, C recorded decreasing as increasing the fibre loading. This showing the fibres transfer the loading effectively. As conclusion, although 10KF5MH specimen does not have the best performance in mechanical properties, a higher flame retardancy shall provide KF reinforced FLO composite with MH filler for more applications in advanced sector especially, in hazardous environment.
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Ching Hao Lee Date Deposited: 30 Jul Last Modified: 12 Oct Composite phd thesis thesis of PhD. pdf Description: thesis of PhD Licence: Creative Commons Attribution Non-commercial No Derivatives UK.
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