Browsing OU - Faculty and Staff Publications by Author "Hamidi, Y. K."
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Characterization of Nanoclay Dispersion in Epoxy Matrix by Combined Image Analysis and Wavelength Dispersive Spectrometry
Aktas, L.; Hamidi, Y. K.; Altan, M. C. (2006-07-02)Nanoclay has been gaining acceptance as a nano-meter scale reinforcement for polymers during the last two decades [1]. It has proven to be successful for reinforcing thermoplastics [2], however, its utilization in thermosetting ... -
Comparison of Void Reduction Methods for Resin Transfer Molded Composites
Hamidi, Y. K.; Aktas, L.; Altan, M. C. (2004)Liquid composite molding (LCM) processes such as resin transfer molding (RTM) have been successfully used to manufacture high performance fiber-reinforced composites at a low cost. However, these composites usually suffer ... -
Effect of Planar Preform Density on Properties of Resin Transfer Molded Composites
Olivero, K. A.; Hamidi, Y. K.; Aktas, L.; Altan, M. C. (2002)The type and volume fraction of fibrous preform used in resin transfer molding has significant influence on the properties of the molded composite parts. In this study, effect of preform architecture and fiber volume ... -
Effect of Repeated Loading on Moisture Absorption of Fiber Reinforced Polymer Composites
Hamidi, Y. K.; Aktas, L.; Altan, M. C. (2011-05)Although known for their ease of production and high specific properties, fiber reinforced polymer composites are highly susceptible to environmental conditions such as moisture absorption. While the adverse effects of ... -
Filtration of Nanoclay Clusters During Resin Transfer Molding of Clay Glass Epoxy Disks
Aktas, L.; Dharmavaram, S.; Hamidi, Y. K.; Altan, M. C. (2005)Inclusion of nanoclay in various polymer systems is being studied as a viable improvement method for thermo-mechanical properties for more than a decade. It has also been shown that addition of nanoclay into polymers ... -
Geometrical Effects in Determination of Fickian Mass Diffusivity of Polymers
Aktas, L.; Hamidi, Y. K.; Altan, M. C. (2003)Hydrophilicity of polymers makes them prone to moisture absorption that leads to degradation of mechanical properties. Kinetics of moisture ingress needs to be fully characterized to perform reliable designs with polymeric ... -
Microscopic Void Analysis in Resin Transfer Molded Composites
Hamidi, Y. K.; Aktas, L.; Altan, M. C. (2003)Composites are being increasingly used in various applications because of their light weight and high performance. One of the common disadvantages of composite materials is the formation of defects during manufacturing ... -
Multiscale Dispersion Characterization and Breakdown of Nanoclay Clusters during Molding
Aktas, L.; Dharmavaram, S.; Hamidi, Y. K.; Altan, M. C. (2005)Thermo-mechanical properties of polymers can be significantly altered by the addition of nano-scale particulates such as carbon nanotubes and nanofibers. Among the nano-scale particulates, inclusion of nanoclay is proven ... -
Nano-scale Flexible Interphase in a Glass Fiber/Epoxy Resin System Obtained by Admicellar Polymerization
Barraza, H. J.; Aktas, L.; Hamidi, Y. K.; O'Rear, E. A.; Altan, M. C. (2002)Organosilane coupling agents are widely used in the composites industry to improve the wetting of inorganic reinforcements by low surface energy resins. An increased wettability is often a harbinger of better mechanical ... -
Post-Cure Compression as a Void Reduction Technique for Thermosetting Composites
Hamidi, Y. K.; Rey, D. V.; Olivero, K. A.; Aktas, L.; Altan, M. C. (2005)Composite materials often suffer from process-induced defects such as voids that lower their overall performance and thus limit their wider application. Void formation mechanisms and detrimental effects of voids on mechanical ... -
Process Induced Defects in Resin Transfer Molded Composites
Hamidi, Y. K.; Altan, M. C. (2016)Resin transfer molding (RTM) is an attractive, versatile and cost-effective alternative to autoclave processing for manufacturing geometrically complex, structural polymer matrix composites (PMC). However, process induced ... -
Thermal History Effects on Moisture Absorption of Fiber-Reinforced Polymer Composites
Hamidi, Y. K.; Aktas, L.; Altan, M. C. (2016)Fiber-reinforced polymer composites may offer numerous attractive features such as low cost, high specific performance, and ease of production. However, there are concerns about the overall durability of these materials, ...