Abstract
This work investigates the nonlinear dynamic response and oscillation analysis of composite-structured cylindrical shells. The core of this structure is constructed from graphene origami (Gori), a metamaterial with a negative Poisson's ratio (NPR). The exterior sides of this structure are composed of aluminum. To precisely determine the dynamic response of a framework, it is subjected to specific conditions, including external excitation and pre-loading. The governing Equations for the behavior and motion of the cylindrical shell are obtained utilizing the enhanced Donnell theory and the nonlinear von Karman theory, facilitating a more precise description of the shell's nonlinear behavior. This study has addressed the boundary conditions for the cylindrical shell in a straight forward manner. The governing Equations of the structure have been resolved utilizing the Galerkin's approach, and the resultant numerical results have been analyzed. This article aims to examine the linear and nonlinear vibration response ratios of cylindrical shells, taking into account the effect of negative Poisson's ratio and its nonlinear dynamic analysis. The findings of the current investigation are shown in the relevant tables alongside related research. This research examines the impact of oscillations in the geometric parameters of the structure and the characteristics of graphene origami as critical variables. The results are illustrated in figures, and their impact on the dynamic and vibrational characteristics of the structure is examined. This research investigates the dynamic behavior of cylindrical composite shells and offers solutions to the issues within this domain by analyzing the applications of this construction.
Key Words
auxetic; Galerkin; graphene origami; nonlinear vibration
Address
Farzad Ebrahimi and Seyede Zahra Mirsadoghi: Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
Abstract
This study investigates the vibrational response of a graphene oxide-reinforced volleyball under impact loading, aiming to enhance its dynamic stability. Employing Hamilton's principle and spherical shell coordinates, we derive the governing equations for the ball's motion under internal loading. These equations are solved using the generalized differential quadrature (GDQ) method and analytical techniques to analyze the vibrational modes. The results demonstrate a significant correlation between the ball's radius and its dynamic stability, with variations in radius substantially affecting vibrational characteristics. Notably, we find that increased ball mass, independent of size, contributes to enhanced stability upon ground impact. This observation suggests that heavier balls exhibit improved resistance to deformation and vibration, leading to more predictable trajectories. The findings provide a quantitative basis for optimizing volleyball design by elucidating the interplay between material reinforcement, geometry, and impact dynamics, thereby facilitating the development of volleyballs with improved stability and performance.
Key Words
ball's radius; GDQM; stability; vibration; volleyball game ball
Address
Zhao Daichang and Song Zhiqiang: College of Physical Education, Shandong Sport University, 276826, China
Li Aiyun: College of Sports and Health, Shandong Sport University, 276826, China
Mostafa Habibi: Universidad UTE, Facultad de Arquitectura y Urbanismo, Calle Rumipamba S/N y Bourgeois, Quito 170147, Ecuador/ Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai 600 077, India/ Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam
Ibrahim Albaijan: Mechanical Engineering Department, College of Engineering at Al Kharj, Prince Sattam Bin Abdulaziz University, Al Kharj 16273, Saudi Arabia
Lian Wong: Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam
Abstract
Small-scale tubular structures have garnered considerable interest owing to their exceptional mechanical qualities, making them suitable for applications requiring lightweight and durable designs. This work examines the stability and buckling behavior of these structures via an integrated approach that merges beam theory with modified couple stress theory, yielding a more accurate comprehension of micro and nanoscale phenomena. The findings are particularly relevant to the sports industry, where advances in equipment and practices may considerably impact player performance and safety. This study looks at how these structures may improve the design of high-performance sports equipment, such as lightweight yet stable bicycle frames, ski poles, and gymnastic vaulting poles, by increasing their strength-to-weight ratio for better performance. The study emphasizes the potential applications in protective equipment and wearable technologies, where maintaining structural integrity is essential for ensuring longevity while preserving mobility. The comprehension of mechanical stability has progressed, leading to the development of a method for integrating advanced structural mechanics into sports engineering, thereby facilitating innovations that improve athletic performance and safety.
Address
Donglin Xiao: Sports College, Xi'an University of Petroleum, Xi'an 710065, Shaanxi, China
Mostafa Habibi: Universidad UTE, Facultad de Arquitectura y Urbanismo, Calle Rumipamba S/N y Bourgeois, Quito, 170147, Ecuador/ Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, 600 077, India/ Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam
Belgacem Bouallegue: Department of Computer Engineering, College of Computer Science, King Khalid University, ABHA, 61421, Saudi Arabia
Maryam Bagheri: Researcher, Hoonam Sanat Farnak, Engineering Company, Ilam, Iran
Abstract
Nanotechnology enables exact manipulation at the nanoscale, resulting in game-changing solutions across numerous sectors. This work investigates the development of a new polyvinyl chloride (PVC)-based nanocomposite using plantain wood powder and nano clay, with a focus on increasing mechanical qualities for use in sports equipment. The use of nano clay significantly improves elastic modulus and bending resistance, providing cost-effective and environmentally friendly alternatives to traditional materials. Furthermore, the material has an excellent resistance to water absorption, ensuring its endurance in a variety of climatic circumstances. The proposed nanocomposite has outstanding qualities for protective equipment, helmets, and sports gear, thereby enhancing player safety and performance. The incorporation of nano clay into PVC composites addresses the limitations of traditional materials, particularly their durability and flexibility issues. The findings highlight the material's potential to transform sports equipment manufacturing by offering lightweight, long-lasting, and environmentally responsible alternatives. Furthermore, the material's biodegradability aligns with global environmental goals. This research highlights nanocomposites' ability to advance material science and enhance the quality of sporting equipment.
Address
Long Yang: College of Tennis Academy, Wuhan Sports University, Wuhan 430070, Hubei, China
Liyang Liu: College of Physical Education, Wuhan University of Technology, Wuhan 430070, Hubei, China
Mostafa Habibi: Universidad UTE, Facultad de Arquitectura y Urbanismo, Calle Rumipamba S/N y Bourgeois, Quito 170147, Ecuador/ Department of Biomaterials, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai 600 077, India/ Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam
Zhijun Chen: Institute Sciences and Design of AL-Kharj, Dubai, United Arab Emirates
Abstract
Nanotechnology incorporated into STEM education shows tremendous potential for active learning centered on students. This paper provides an exploration into three active learning applications involving problem-based learning, collaborative projects, and hands-on experiments for effective teaching of the concept of nanotechnology. By focusing on the effective use of student-centered methods, it is possible to provide an interactive environment that triggers curiosity and a deeper understanding of science at the nanoscale. In this process, active learning techniques for nanotechnology education will be matched and then analyzed for their outcomes in terms of students' participation, retention, and the development of critical thinking. Furthermore, faculty and student feedback are discussed regarding the benefit and challenges of adopting active learning. These results suggest that active learning enhances students' interest and increases the depth of understanding in complex concepts pertaining to nanotechnology, therefore enriching an active learning pedagogic practice in a STEM-related curriculum. This study provides evidence contributing toward the development of instructional strategies aimed at enhancing meaningful learning in rapidly evolving fields like that of nanotechnology.
Key Words
active learning strategies; enhancing student engagement and comprehension; STEM education; teaching nanotechnology
Address
Feng Hu: School of European Studies, Tianjin Foreign Studies University, 300204, Tianjin, China
Dhouha Choukaier: Department of Basic Health Sciences in the Foundation Year for Health Colleges Program, College of Languages, Princess Nourah bint Abdulrahman University,
P.O. Box 84428, Riyadh 11671, Saudi Arabia
Abhinav Kumar: Department of Nuclear and Renewable Energy, Ural Federal University Named after the First President of Russia Boris Yeltsin, Ekaterinburg 620002, Russia/ Department of Technical Sciences, Western Caspian University, Baku, Azerbaijan/ Centre for Research Impact & Outcome, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, 140401, Punjab, India
Ankit D. Oza: University Centre for Research and Development, Chandigarh University, Mohali, Punjab, 140413, India/ Refrigeration &Air-condition Department, Technical Engineering College, The Islamic University, Najaf, Iraq
Jajneswar Nanda: Department of Mechanical Engineering, Siksha 'O' Anusandhan (Deemed to be University), Bhubaneswar, Odisha-751030, India
Abstract
The main binder in concrete, which is extensively employed in building, Portland cement, is condemned for having a major negative environmental impact. In the field of civil engineering, engineered geopolymer composites (EGC) are a very promising substitute that offers improved sustainability while utilizing comparable special material features to ECC. Environmentally friendly EGC have mechanical properties like traditional Portland cement, however they are susceptible to cracks during tensile and flexural loadings. In this study, polypropylene (PP) fibers and functionalized multi-walled carbon nanotubes (f-MWCNTs) were employed to enhance the ductility of ground granulated blast furnace slag (GGBS)-based EGC (GGBS-EGC). The effect of employing f-MWCNTs and PP fibers was examined by mechanical tests, which comprised single-crack tension assessments, three-point bending, uniaxial tension, and compression tests. The GGBS-based engineering geopolymer showed a peak tensile strength of 3.65 MPa, an elongation of 5.48%, an initial tensile fracture strength of 2.42 MPa, and a compressive strength of 38.03 MPa after 28 days of curing. Having crack widths of 74.56
Address
Nejib Ghazouani: Mining Research Center, Northern Border University, Arar 73222, Arar, Saudi Arabia
Abdellatif Selmi: Prince Sattam Bin Abdulaziz University, College of Engineering, Department of Civil Engineering, Alkharj, 11942, Saudi Arabia
Zeeshan Ahmad: Department of Civil Engineering, Quaid-e-Azam College of Engineering and Technology (QCET) Sahiwal 57000, Pakistan
Nabil Ben Kahla: Department of Civil Engineering, College of Engineering, King Khalid University, PO Box 394, Abha 61411, Saudi Arabia/ Center for Engineering and Technology Innovations, King Khalid University, Abha 61421, Saudi Arabia
Abstract
Using the NETCR (normal-exposed-tumor-cancer-recovered) model, the present work is done to create a dynamic cancer model that shows how cancer progresses from normal cells to cancerous cells. By analyzing the dynamics of the disease and utilizing Python software to determine numerical simulation of cancer cells. The growth rates of normal, exposed, tumor and cancer cells are equivalent to the natural death rate of cells against concentrations of cells are depicted in various graphs. The rates at which cells divide are represented by the growth rates of normal, exposed, tumor, and cancer cells. Furthermore, sensitivity study is performed for various parameters and identified the optimal control strategies by utilizing nanotechnology approaches.
Key Words
cancer transmission; cells transmission; dynamical stability; nanotechnology; optimal control; sensitivity analysis
Address
Ghulam Murtaza and Muzamal Hussain: Department of Mathematics, University of Sahiwal, Sahiwal, 57000, Pakistan
Riadh Marzouki: Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, 61413 Abha, Saudi Arabia
Elimam Ali: Department of Civil Engineering, College of Engineering in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia
Abdur Rauf and Lubna Rasool: Department of Chemistry, University of Sahiwal, Sahiwal, 57000, Pakistan
Abstract
A spherical shell panel with two nanocomposite piezoelectric (NCP) facesheets and a functionally graded porous (FGP) core is the subject of the present investigation. Not only are the layers firmly linked to one another, but their qualities are functionally graded as well. When an electric voltage is provided externally to NCP patches, carbon nanotubes (CNTs) are utilized to enhance their electro-mechanical performance. The kinematic relations are shown by applying von Karman's assumptions and the first-order shear deformation theory (FSDT). By utilizing Hamilton's principle and variational approach, the equations regulating motion are derived. The differential motion equations are solved using an analytical method based on Fourier series functions. After ensuring the accuracy of the results, the influence of various factors on the model's normalized frequencies is examined. These factors include the porosity index, patterns of pore distribution, patterns of CNT distribution, and other critical parameters. More efficient smart structures and devices might be in the works according to this study's results.
Key Words
carbon nanotubes-reinforced composites; electric field; porous materials; spherical shells; vibration analysis
Address
Zhiwei Lu: Department of Physical Education, Luoyang Institute of Science and Technology, Luoyang, Henan, 471023, China
Li-Cai Zhao: The Third Engineering Co., Ltd., China Railway 19th Bureau Group Co., Ltd., Shenyang 110136, Liaoning Province, P.R. China
Yasser Alashker: Department of Civil Engineering, College of Engineering, King Khalid University, PO Box 394, Abha 61411 Kingdom of Saudi Arabia/ Center for Engineering and Technology Innovations, King Khalid University, Abha 61421, Saudi Arabia
