Abdalla Ahmed
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Scopus Publications
Abdalla Ahmed, Amr Osman, Abd El-Moaty El-Hakeem, and Saleh Kaytbay
SAGE Publications
Graphene has excellent mechanical and thermal properties, while alumina has inexpensive and strong thermal stability, making it ideal for electronic packaging applications. The current work examines the effects of modest loadings of reduced graphene oxide (rGO), alumina (Ala), and their hybrids on the dynamic mechanical characteristics and thermal transitions of epoxy-based nanocomposites. The rGO was made using a modified Hummers’ method. Alumina nanoparticles were used as received. Various epoxy nanocomposite samples with 1 wt% of rGO, 1 wt% of Ala, and 0.5 wt% each of rGO and Ala were created. Then, Raman spectroscopy, XRD, FTIR, XPS, TEM, AFM, and SEM were used to analyze the fillers and their hybrid and epoxy-based nanocomposites. Dynamic mechanical analysis was used to examine the hybrid epoxy-based nanocomposites’ dynamic mechanical behavior. It has been demonstrated that different epoxy nanocomposites with 1 wt% Ala and 1 wt% rGO have higher elastic moduli than those with 0.5 wt% rGO and 0.5 wt% Ala. The rGO-Ala hybrid nanocomposites, on the other hand, exhibit moderate damping and glass transition temperatures. The reason for that may be because Ala filler increases the contact area between the rGO sheets and serves as a bridge between the two fillers, decreasing the resistance to deformation. This may enhance the possibility that these stress concentrations will weaken the composites.
Abdalla Ahmed, Alamry Ali, Bandar Alzahrani, and Kazuaki Sanada
Wiley
Amr Osman, Abdelmoty Elhakeem, Saleh Kaytbay, and Abdalla Ahmed
Springer Science and Business Media LLC
Amr Osman, Abdelmoty Elhakeem, Saleh Kaytbay, and Abdalla Ahmed
Elsevier BV
Abdalla Ahmed, Kazuaki Sanada, Mohamed Fanni, and Ahmed Abd El-Moneim
Elsevier BV
Abdalla Ahmed and Kazuaki Sanada
Elsevier BV
Abdalla Ahmed, Kazuaki Sanada, Mohamed Fanni, and Ahmed Abd El-Moneim
Elsevier BV
Abdalla Ahmed, Kazuaki Sanada, Mohamed Fanni, and Ahmed Abd El-Moneim
Trans Tech Publications, Ltd.
Microcapsules are used in a wide range of applications, especially in self-healing composite materials and phase change materials. There is a growing body of literature that recognizes the importance of reinforcement on the mechanical properties of composites, however the effect of microcapsules during service needs to be further investigated. In this study, numerical investigations were conducted to examine the effects of the various geometric parameters on the mechanical behavior of microcapsules-based composites. The effective Young’s modulus and Poisson’s ratio of core-shell microcapsules distributed in a continuous matrix were predicted. A detailed three-dimensional finite element modeling (FEM) was presented. The numerical results were compared with a hierarchical proposed analytical model for three-constituent composites. Good agreements were achieved.