Abstract
The current research examines the transient dynamic deflection response of graphene-reinforced composite structures when subjected to external forces. Analytical solutions are specifically provided for the vibration of a rectangular composite plate that is ultimately loaded and is based on the sinusoidal shear deformation theory (SSDT). The equations of motion are derived from Hamilton's principle, considering shear deformation and bending. A Fourier series expansion is applied to the system response analysis, which allows for the quick calculation of transient deflections by breaking the problem down into harmonic components. One of the major advancements of this study is the application of Laplace transform inversion via the modified Dubner and Abate formulation, which greatly improves both the accuracy and speed of solving transient dynamic problems in composite materials. The investigation of graphene's impact on damping, natural frequencies, and overall dynamic stability of the composite structure is done along with the critical insights into its performance at different excitation frequencies. The findings indicate that the vibrational damping of graphene-based composites is better than that of conventional materials and that they also exhibit different resonance behaviors, which can be advantageous for the East and West coast engineering applications. The analytical framework presented in this paper can predict the dynamic response of graphene-reinforced composite plates and thus help in the design of structural materials that are more robust and resilient under dynamic loading conditions.
Address
Anber Abraheem Shlash Mohammad: Digital Marketing Department, Faculty of Administrative and Financial Sciences, University of Petra, Jordan
Suleiman Ibrahim Mohammad: Electronic Marketing and Social Media, Economic and Administrative Sciences, Zarqa University, Jordan/ Research follower, INTI International University, 71800 Negeri Sembilan, Malaysia
Asokan Vasudevan: Faculty of Business and Communications, INTI International University, 71800 Negeri Sembilan, Malaysia/ Shinawatra University, 99 Moo 10, Bangtoey, Samkhok, Pathum Thani 12160 Thailand
Badrea Al Oraini: Department of Business Administration, College of Business and Economics, Qassim University, Qassim – Saudi Arabia
Mohammad Faleh Ahmmad Hunitie: Department of Public Administration, School of Business, University of Jordan, Jordan
Abstract
Management of nonlinear wave propagation in graphene-reinforced solar cells is an important part of their performance improvement and reliability. In this paper, the authors examine the nonlinear phase velocity characteristics of graphene-reinforced composite materials in the case of micro-sized solar cell plates. They use a new deep neural network-genetic algorithm (DNN–GA) combination to check the nonlinear wave propagation results, thereby increasing the prediction's accuracy and efficiency. The Halpin-Tsai model is used for determining the effective properties of graphene-reinforced composites, whereas the modified coupled stress theory (MCST) and sinusoidal shear deformation theory (SSDT) are combined to reflect the influence of microstructural behaviors on wave propagation. Modified pair stress theory (MPST) is also used to allow for the size-dependent and microstructural deformation effects of the composite material. The governing equations are obtained through Hamilton's principle, and an analytical method is then used to find the solutions to these equations. The results reveal that graphene reinforcement has a significant effect on the phase velocity and that the proposed framework is very useful for accurately tracing the material's nonlinear dynamical states. The research has pointed out the fact that it is critical to resort to effective management methods so that the nonlinear wave propagation can be controlled in order to sustain the micro-sized solar cells' structural integrity and performance enhancement in real-life applications. Now, this framework has become a reliable instrument for designing and optimizing advanced graphene-reinforced composites, which are meant for the next generation of solar technologies.
Key Words
DNN–GA; graphene-reinforced composites; management; modified coupled stress theory; nonlinear wave propagation; solar cell optimization
Address
Suleiman Ibrahim Mohammad: Research follower, INTI International University, 71800 Negeri Sembilan, Malaysia
Asokan Vasudevan: Faculty of Business and Communications, INTI International University, 71800 Negeri Sembilan, Malaysia/ Shinawatra University, 99 Moo 10, Bangtoey, Samkhok, Pathum Thani 12160 Thailand
Wan Mohd Hirwani Wan Hussain: Graduate School of Business, Universiti Kebangsaan Malaysia, Bangi,43600, Selangor, Malaysia
Basem Abu Zneid: Faculty of Engineering, Hourani Center for Applied Scientific Research, Al-Ahliyya Amman University, Amman, Jordan
Abstract
The study presents a rational approach for design and optimization of high-strength One-Part Geopolymer Concrete (OP-GPC) mixes for a targeted compressive strength of 70 MPa using Response Surface Methodology (RSM). The model generated through RSM showed significant statistical relationship between the selected input and output variables. The high-strength OP-GPC was designed with ground granulated blast furnace slag as primary binder and anhydrous sodium metasilicate as the solid activator. The RSM model established statistically significant relationships between design parameters and compressive strength, which were subsequently validated through laboratory experimentation. The optimized OP-GPC have achieved compressive strength in the range of 70 MPa-76 MPa at 28 day. The experiments showed that approximately 90% of the targeted compressive strength was achieved within initial 7 days. The mechanical performance of high-strength OP-GPC was measured in terms of flexural and split-tensile strengths which was measured at 7.37 MPa and 5.32 MPa at 28 days, respectively. The durability of high-strength one-part GPC was also measured which showed low permeable void content of 8.17%, sorptivity of 0.0010 mm/s
Abstract
This research paper explores the development and characterization of three Ti-Ni-Cu shape memory alloys (SMAs), Ti50Ni40Cu10, Ti50Ni38Cu12, and Ti50Ni35Cu15, synthesized through powder metallurgy. We investigate the effects of various heat treatments, including solution treatment, annealing, and aging, on their microstructure and properties. Comprehensive analyses, including Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX), and percentage porosity measurements, were conducted. This study aims to study the influence of heat treatment processes on SEM morphology, EDX, DSC thermal transitions, porosity, and density of the SMAs. From the DSC results, it is evident that transformation temperatures increase with higher Cu content in the solution-treated, annealed, and aged samples. The percentage porosity and pore size increase with higher Cu content in all heat treatment processes, but the minimum percentage porosity and smallest pore sizes are observed in the annealed samples. SEM images confirm the presence of porosity and reveal the pore sizes. Optical microscopy shows that grain size increases with higher Cu content.
Key Words
advanced materials; aging; annealing; porosity; scan electronic microscopy
Address
Abid Hussain, Afzal Khan, Asnaf Aziz: Department of Mechanical Engineering, University of Engineering and Technology, Peshawar, Pakistan, 25100
Muhammad Imran Khan: Faculty of Materials and Chemical Engineering, Ghulam Ishaq Khan (GIK) Institute of Science,
Engineering and Technology, Khyber Pakhtonkhwa, Pakistan
Saif Ur Rehman: Institute of Industrial Control System, Rawalpindi, Pakistan
Abstract
Porosity in functionally graded materials (FGMs) arises during fabrication due to several factors, depending on the technique employed. The type of reinforcement used significantly influences the overall porosity percentage. The presence of porosity negatively affects the performance of FG structures. Consequently, this study focuses on conducting a thermal buckling analysis of FG porous plates using a refined shear deformation plate theory. This theory accounts for a quadratic variation of the transverse shear strains through the thickness and satisfies zero traction boundary conditions on the plate's top and bottom surfaces without relying on shear correction factors. Thermal loads were applied by varying the temperature uniformly, linearly, and non-linearly through the thickness. The problem was addressed assuming the plate to be simply supported at its ends. The rule of mixtures was used to estimate the material properties, and a porosity parameter was introduced to represent the equal distribution of porosity in the metal and ceramic mixture. The effects of volume fraction index, porosity fraction index, aspect ratio, and side-to-thickness ratio were investigated.
Address
Khayra Draouche: Laboratory of Geomatics and Sustainable Development, University of Tiaret, Algeria
Lazreg Hadji, Nafissa Zouatnia: Department of Civil Engineering, University of Tiaret, BP 78 Zaaroura, Tiaret, 14000, Algeria
Royal Madan: Department of Mechanical Engineering, Graphic Era (Deemed to be University), Dehradun 248002, Uttarakhand, India
Hassen Ait Atmane: Laboratory of Structures, Geotechnics and Risks, Department of Civil Engineering, Hassiba Benbouali University of Chlef, Chlef, Algeria
