Article
Thermodynamics
Quoc-Hoa Pham, Van Ke Tran, Trung Thanh Tran, Trung Nguyen-Thoi, Phu-Cuong Nguyen, Van Dong Pham
Summary: This article presents a finite element method based on a quasi-3D nonlocal theory to study the free vibration of functionally graded material nanoplates on an elastic foundation in a thermal environment. The study compares numerical results with previous research to verify accuracy and investigates the effects of various parameters on the free vibration of nanoplates.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mathematics, Applied
Pei Zhang, P. Schiavone, Hai Qing
Summary: A nonlocal study of vibration responses of FG beams supported by a viscoelastic Winkler-Pasternak foundation is conducted, considering the damping responses of both the Winkler and Pasternak layers of the foundation. The bending deformation of the beams and the elastic and damping responses of the foundation are comprehensively considered by uniting differential formulations of strain-driven and stress-driven two-phase local/nonlocal integral models, addressing the stiffness softening and toughening effects. The GDQM is used to solve the complex eigenvalue problem, and benchmark results for vibration frequency are obtained.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2023)
Article
Mechanics
Uttam Kumar Kar, J. Srinivas
Summary: The present study deals with the transient dynamic analysis of bi-directional functionally graded material microbeams with edge cracks resting on nonlinear elastic foundations in the presence of thermal shock loads. The dynamic equations of the beam are derived from Hamilton principle by considering modified couple stress theory and the equations of motion are solved through the finite element model. Inverse based optimization methodology is illustrated through minimization of error functions derived from natural frequencies and input power flow to identify the crack depth and location. A surrogate scheme with firefly metaheuristic optimization employing back propagation neural network regression model is proposed for obtaining the effective solution.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Computer Science, Interdisciplinary Applications
Mahsa Najafi, Isa Ahmadi
Summary: In this paper, an efficient method based on nonlocal elasticity theory and Layerwise theory is proposed for the analysis of bending, buckling, and vibration of functionally graded nanobeam. The method takes into account the transverse shear and normal strains of nanobeam and the small-scale effect. The proposed theory is validated by comparing with other theories and shows accurate results in predicting vibration, buckling, and bending of nanobeams.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mechanics
Yuqian Xu, Peijun Wei, Lina Zhao
Summary: The present work investigates the flexural wave propagation in a micro-beam mounted on viscoelastic foundation, considering nonlocal strain gradient elasticity and the effects of size. A parameter study in numerical examples is conducted to explore the influences of nonlocal effects, strain gradient effects, and fractional-order viscoelastic effects on wave propagation.
Article
Mechanics
Kalyan Boyina, Raghu Piska, Sundararajan Natarajan
Summary: A nonlocal strain gradient model is developed for the buckling analysis of functionally graded Euler-Bernoulli beam subjected to thermo-mechanical loads. The governing equations incorporate the effects of nonlocal and strain gradient parameters. Thermal properties over the cross section are graded using the power law. The proposed model compares well with the existing literature in the limiting sense of no nonlocal and gradient effects.
Article
Nanoscience & Nanotechnology
Pham Van Vinh
Summary: This study investigates the effects of variable nonlocal parameters on the free vibration of power-law and sigmoid functionally graded nanoplates. The study offers a novel assumption of the smooth variation of nonlocal parameters through the thickness of nanoplates. Verification studies demonstrate the accuracy and efficiency of the proposed algorithm in predicting the free vibration behavior of functionally graded nanoplates.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Pham Van Vinh, Abdelouahed Tounsi, Mohamed-Ouejdi Belarbi
Summary: This paper investigates the free vibration behavior of functionally graded porous doubly curved shallow nanoshells with variable nonlocal parameters. The modified Eringen's nonlocal elasticity theory is applied to capture the small size effect of the naturally discrete FG nanoshells. The governing equations of motion are established using the Hamilton's principle and solved analytically using the Navier's solution. The accuracy of the proposed algorithm is demonstrated through comparisons with existing literature. The effects of geometric parameters, material properties, porosity, and the variation of the nonlocal parameter on the free vibration behavior are analyzed.
ENGINEERING WITH COMPUTERS
(2023)
Article
Mathematics, Applied
Wei Peng, Like Chen, Tianhu He
Summary: Functionally graded materials (FGMs) exhibit excellent thermal shock resistance, and the size-dependent effect becomes important at micro-scale, requiring the use of nonlocal generalized thermoelastic theory. The study formulates governing equations for a simply supported FGM microbeam heated by ramp-type heating using Laplace transform techniques, and presents numerical results discussing the effects of ramp-heating time parameter, nonlocal parameter, and power-law index.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Materials Science, Multidisciplinary
Mohamed-Ouejdi Belarbi, Li Li, Mohammed Sid Ahmed Houari, Aman Garg, Hanuman Devidas Chalak, Rossana Dimitri, Francesco Tornabene
Summary: This work studies the size-dependent free vibration response of functionally graded nanoplates using a layerwise theory. The proposed model has a fixed number of variables and adopts the nonlocal elasticity theory to capture the small size effects. The developed finite element model has been demonstrated to be robust and reliable, and a detailed parametric analysis has been conducted.
MATHEMATICS AND MECHANICS OF SOLIDS
(2022)
Article
Construction & Building Technology
Quoc-Hoa Pham, Phu-Cuong Nguyen, Van-Ke Tran, Trung Nguyen-Thoi
Summary: This study presents an improved triangular element for investigating the mechanical properties of functionally graded porous nano-plates. By studying the static, vibrational, and buckling responses of the nano-plates, the effects of geometric and material properties on their performance were examined in detail.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Acoustics
Mohammadamin Forghani, Yousef Bazarganlari, Parham Zahedinejad, Mohammad Javad Kazemzadeh-Parsi
Summary: This paper investigates the nonlinear frequency behavior of cracked functionally graded porous beams, providing extensive research results to understand the influences of different parameters. The crack location has a significant impact on the nonlinear frequency ratios.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Wei Peng, Baocai Pan, Liyan Meng
Summary: This article proposes a modified TED model to estimate the impact of size-dependent effect on the thermoelastic damping (TED) of FG sandwich microbeam resonators. By combining the nonlocal elasticity model, surface elasticity model, and dual-phase-lag heat conduction model, the analytical expression of TED is derived and the influences of various factors on TED are analyzed.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Nikola Nesic, Milan Cajic, Danilo Karlicic, Aleksandar Obradovic, Julijana Simonovic
Summary: This paper investigates the nonlinear dynamic behavior of a nonlocal functionally graded Euler-Bernoulli beam resting on a fractional visco-Pasternak foundation and subjected to harmonic loads. The proposed model captures both the elastic stress gradient field considering the nonlocal parameter and the strain gradient stress field considering the material length scale parameter. The study demonstrates that the application of the incremental harmonic balance method in analyzing nonlocal strain gradient theory-based structures can lead to more reliable studies for strongly nonlinear systems.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Civil
Pham Van Vinh, Abdelouahed Tounsi
Summary: This paper investigates the free vibration of functionally graded doubly curved nanoshells using nonlocal first order shear deformation theory, and the frequencies are obtained via Navier's solution technique. The effects of various parameters on the vibration response are also studied.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Ismail Esen, Mohamed A. Eltaher, Alaa A. Abdelrahman
Summary: This article investigates the dynamic responses of symmetric and sigmoid FG Timoshenko beam subjected to moving mass. The study explores the influences of gradation type, gradation index, elastic foundation stiffnesses, inertia, and variable velocity of the moving mass on the dynamic response. The Hamilton principle and finite element method are used for modeling and solving the system.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Alaa A. Abdelrahman, Ismail Esen, Ahmed Amin Daikh, Mohamed A. Eltaher
Summary: In this study, a nonclassical size dependent model was developed to investigate the dynamic behavior of CNTs reinforced composite beams under moving load. The effects of various parameters such as elastic foundation parameters, volume fraction, CNTs configuration, nonclassical parameters, and moving load velocity were analyzed. The obtained results provide valuable insights for the design and manufacturing of composite CNTs beams.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
M. A. Eltaher, R. A. Shanab, N. A. Mohamed
Summary: This article presents an enhanced mathematical model and closed-form solutions to explore the dynamic vibration response of perforated viscoelastic nanostructure thin/thick nanobeams with a size-dependent continuum model and different boundary conditions. The influences of viscoelastic parameter, nonlocal softening coefficient, supporting conditions, and filling/spacing ratio on the vibration response are analyzed.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Mathematics
Gamal S. S. Abdelhaffez, Ahmed Amine Daikh, Hussein A. A. Saleem, Mohamed A. A. Eltaher
Summary: A mathematical model of tricoated functionally graded materials (FGMs) is proposed in this paper to analyze analytically the buckling problem of coated FG spherical nanoshells resting on an orthotropic elastic foundation subjected to biaxial loads. The study considers the size-dependent and microstructure effects using the nonlocal strain gradient theory and applies the principle of virtual work to obtain equilibrium equations. The Galerkin technique is used to solve the obtained differential equations under various boundary conditions. A detailed parametric analysis is conducted to investigate the influence of different schemes of coated FGMs, gradient material distribution, length scale parameter (nonlocal), material scale parameter (gradient), nanoshell geometry, and orthotropic elastic foundation on the critical buckling loads.
Article
Mathematics
Ammar Melaibari, Salwa A. Mohamed, Amr E. Assie, Rabab A. Shanab, Mohamed A. Eltaher
Summary: This study analyzes the responses of beams and plates using middle surface (MS) and neutral surface (NS) formulations. It derives the relations between the displacement field variables on NS and MS, and defines modified boundary conditions for immovable simply supported plates. The study shows that the responses of BDFG plates based on MS and NS formulations are identical for clamped and movable simply supported boundary conditions. However, there are differences in the responses for immovable simply supported boundary conditions if fixation constraints at different planes are not properly treated.
Article
Chemistry, Physical
Aboujaila A. M. Soltan, Ismail Esen, Seyit Ali Kara, Hayrettin Ahlatci
Summary: Corrosion and wear tests were conducted on NiTi alloy samples with shape memory effect. The corrosion test revealed a proportional reduction in thickness of the samples with the change in corrosion current values. Moreover, the weight loss of the samples in corrosive wear was found to be 20% less than that in dry wear.
Article
Chemistry, Physical
Hamza A. H. Abo Nama, Ismail Esen, Hayrettin Ahlatci, Volkan Karakurt
Summary: In this study, Al7075+0%Ti-, Al7075+2%Ti-, Al7075+4%Ti-, and Al7075+8%Ti-reinforced alloys were prepared and examined for their microstructure, mechanical behavior, and dry-wear behavior. The addition of Ti increased the peak hardness and wear resistance of the Al7075 alloy, attributed to the formation of oxide films, precipitation hardening, secondary hardening, grain refinement, and solid-solution-hardening mechanisms.
Article
Engineering, Multidisciplinary
Abdulmuaen Sager, Ismail Esen, Hayrettin Ahlatci, Yunus Turen
Summary: This paper investigates the microstructure, mechanical, immersion, and potentiodynamic corrosion behaviors of extruded ZK60 matrix composites reinforced with SiC and AlN particles. The results show that increasing the percentages of SiC and AlN reinforcement elements in the matrix improves corrosion resistance.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Mechanics
Ahmed Amine Daikh, Mohamed-Ouejdi Belarbi, Sattar Jedari Salami, Miloud Ladmek, Abdelkader Belkacem, Mohamed Sid Ahmed Houari, Hani Magdy Ahmed, Mohamed A. Eltaher
Summary: This paper presents a mathematical model to analyze the static bending response of laminated composite beams reinforced by functionally graded fibers and randomly oriented single-walled carbon nanotubes. Various schemes of material distributions and types of elastic foundations are considered, and the equilibrium equations are derived using the virtual work principle and solved numerically using Fourier series. A detailed parametric analysis is performed to investigate the impact of different distribution patterns, volume fractions, and elastic foundation parameters on the deflection of the composite beam.
Article
Engineering, Aerospace
Hao-Xuan Ding, M. A. Eltaher, Gui-Lin She
Summary: A nonlinear analysis is conducted to study the low-velocity impact behavior of a graphene platelets-reinforced metal foam cylindrical shell with spinning motion in a thermal environment. The effects of geometric imperfections, spinning velocity, boundary conditions, graphene platelets distribution patterns, foam distribution types, foam coefficient, graphene platelets weight fraction, temperature changes, impactor's radius and initial velocity, prestressing force, and damping coefficient on the impact problems are discussed in detail using the Runge-Kutta method.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mohamed Ali Ibrahim Alwakwak, Ismail Esen, Hayrettin Ahlatci, Esma Keskin
Summary: This study investigates the microstructural properties and corrosion behavior of magnesium with added RE elements (Y, La) in varying minors after casting and heat treatment. The results show the presence of three-phase structures, such as α-Mg, lamellae-like phases, and network-shaped eutectic compounds. The corrosion behavior is affected by the content of lanthanum, with an increase in crater structures and a decrease in corrosion resistance observed. The corrosion products formed by Y2O3 and Y(OH)3 contribute to the thickness of the corrosion film and act as a protective barrier.
Article
Chemistry, Physical
Masoud M. M. Elhasslouk, Ismail Esen, Hayrettin Ahlatci, Bengu Akin
Summary: This study focuses on the microstructure, hardness, corrosion behavior, and rotary bending fatigue properties of rolled Al5083-H111 materials. It is the first to investigate the fatigue behavior of corroded Al5083 samples in aggressive corrosion environments. The microstructure of Al5083-H111 consists of grains oriented towards the rolling direction, with various precipitates distributed randomly at the grain boundary. The corrosion resistance of the samples varies in different NaCl and NaCl + HCl solutions, and corroded samples show lower fatigue life compared to non-corroded samples.
Article
Engineering, Mechanical
Bahadir Furkan Kinaci, Huseyin Botsali, Cevat Ozarpa, Ismail Esen, Hayrettin Ahlatci
Summary: This study investigated the fatigue occurring in the draw hook body and its influencing factors experimentally and numerically. The material's microstructure characterization and mechanical properties were examined. The fatigue behavior and endurance limit were obtained through testing and computer analysis.
ENGINEERING FAILURE ANALYSIS
(2024)
Article
Mechanics
Amr E. Assie, Salwa A. Mohamed, Rabab A. Shanab, Rasha M. Abo-bakr, Mohamed A. Eltaher
Summary: This article develops a mathematical model to study the static stability of bi-directional functionally graded porous unified plate and discusses the significant factors affecting the static stability and buckling loads through parametric studies.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2023)
Article
Mechanics
H. M. Abo-Bakr, R. M. Abo-Bakr, S. A. Mohamed, M. A. Eltaher
Summary: This study investigates multiobjective shape optimization of nonuniform microbeams made of functionally graded materials. The goal is to discover optimal shape functions and volume fraction distribution to maximize critical buckling load and fundamental frequency while minimizing mass and material cost. The study presents the static and dynamic behavior of axially functionally graded material nonuniform microbeam based on Timoshenko beam theory with modified couple stress theory. Multiobjective particle swarm optimization is applied to search for Pareto optimal solutions, considering shape functions parameters, types, and FGM power index as design variables. Several cases are studied to demonstrate the effectiveness of multiobjective optimal shape design of axially functionally graded beams.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)