Article
Nanoscience & Nanotechnology
Hamed Momeni-Khabisi, Masoud Tahani
Summary: In this study, the nonlocal strain gradient theory was utilized to predict the size-dependent buckling and post-buckling behavior of nano-scale piezo-flexomagnetic plate strips in two modes of direct and converse flexomagnetic effects. Analytical analysis using the first-order shear deformation plate theory was conducted for nano-strips with simply supported boundary conditions. Validation of formulations and parametric study were carried out.
ADVANCES IN NANO RESEARCH
(2022)
Article
Crystallography
Shuohui Yin, Zhibing Xiao, Gongye Zhang, Jingang Liu, Shuitao Gu
Summary: This paper proposes an analytical solution and isogeometric analysis numerical approach for buckling analysis of size-dependent beams based on a reformulated strain gradient elasticity theory. The obtained results show the accuracy of the current method and investigate the influences of different factors.
Article
Mechanics
Giovanni Tocci Monaco, Nicholas Fantuzzi, Francesco Fabbrocino, Raimondo Luciano
Summary: This study investigates the vibrations and buckling of thin laminiated composite nano plates in hygrothermal environment using second-order strain gradient theory. Numerical solutions for a large number of laminates are provided along with comparisons to classical analytical solutions. Critical temperatures for cross-and angle-ply laminates are also shown in this work.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
H. Farahmand
Summary: In this paper, a two-variable refined plate theory and strain gradient theory (TV-SGT) is adopted for buckling analysis of moderately thick microplates. The TV-SGT simultaneously considers shear and micro-effects, eliminating the need for a shear correction factor. The impact of thickness, length scale parameters, and dimensions on the non-dimensionalized critical buckling load of the microplate is investigated, showing an increasing gap between TV-SGT and classical theory results with increasing thickness.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Mechanics
Manjur Alam, Sudib Kumar Mishra
Summary: Continuum mechanics is extended to the Nonlocal (NL) and the Strain Gradient (SG) theories to analyze/designed nanostructures made of smart materials. This study investigates the thermal post-buckling of a piezoelectric, NLSG thin cylindrical shell with thickness-wise gradation of elastic properties. The governing equations are derived and solved using the Boundary Layer (BL) concept and asymptotic expansions, showing prominent SG but only nominal NL effects.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Engineering, Multidisciplinary
BingBing Wang, Chunsheng Lu, CuiYing Fan, MingHao Zhao
Summary: In this paper, a meshfree Galerkin approach is presented for analyzing free vibration and buckling of strain gradient thin plates. The method utilizes smooth meshfree approximation to reduce variables and introduces a consistent integration scheme with gradient smoothing. Numerical results confirm the effectiveness of this approach, which is superior to traditional methods.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2021)
Article
Engineering, Mechanical
Abhilash Dhanoriya, Manjur Alam, Sudib Kumar Mishra
Summary: This study investigates the buckling and the postcritical behavior of nanoarch subjected to inward pressure using nonlocal (NL), strain gradient (SG) continuum theory. The study found that the interactions between NL and SG not only cause quantitative changes in the instability behavior, but also lead to qualitative changes, especially for SG arches. Similar to classical arches, the prebuckling nonlinearity is shown to be significant.
JOURNAL OF ENGINEERING MECHANICS
(2023)
Article
Mechanics
Michele Bacciocchi, Angelo Marcello Tarantino
Summary: A nonlocal model based on the strain gradient approach is developed within the framework of the Third-order Shear Deformation Theory for the investigation of the free vibrations and the critical buckling loads of laminated composite nanoplates. The theory is suitable for dealing with thick and thin plates, and provides reliable benchmarks for future developments in the topic.
COMPOSITE STRUCTURES
(2021)
Article
Physics, Condensed Matter
Thanh Cuong-Le, Khuong D. D. Nguyen, Minh Hoang-Le, Thanh Sang-To, Phuong Phan-Vu, Abdel Wahab Magd
Summary: A numerical isogeometric solution based on the nonlocal strain gradient elasticity theory is presented for the static bending, free vibration, and buckling analysis of sigmoid functionally graded (S-FG) nanoplates. The study explores the effects of material variation, neutral axis location, nonlocal parameter, strain gradient parameter, and material index on the responses of S-FG nanoplates.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Engineering, Mechanical
Sai Sidhardh, Sansit Patnaik, Fabio Semperlotti
Summary: This study introduces a framework for stability analysis of nonlocal solids described by fractional-order continuum theory, establishing Lagrange-Dirichlet stability criteria through energy-based approach using geometrically nonlinear fractional-order kinematic relations. The study also derives the Rayleigh-Ritz coefficient for critical load and determines critical loads for buckling of nonlocal beams and plates using fractional-order finite element solver. Results show the influence of nonlocal interactions on both material and geometric stiffness, supported quantitatively through case studies and comparison with classical nonlocal approaches.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Dandan Liu, Tie Geng, Hongxiao Wang, Shahab Esmaeili
Summary: This article presents a size-dependent generalized thermoelasticity model to examine the impact of structural and thermal scale parameters on thermoelastic vibrations of Euler-Bernoulli nanobeams. The study highlights the pivotal role of scale parameters in assessing the realistic thermoelastic behavior of nanobeams, and demonstrates that the nonclassical model can reproduce both softening and hardening behavior in nanostructures.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Mechanics
Y. S. Joshan, L. K. Sharma, Neeraj Grover, R. K. Godara
Summary: In this article, couple stress models in the non-polynomial framework are developed and used to examine the structural response characteristics of composite micro-plates. The study considers length scale effects and various shear shape functions to model transverse shear deformation effects, with governing equations formulated using the Hamilton principle and linear structural kinematics. The methodology is applied to analyze bending, free vibration, and buckling responses of the micro-plates, with comparisons made among different plate theories to assess the applicability of various deformation theories in modeling composite micro-plates.
COMPOSITE STRUCTURES
(2021)
Article
Mathematics, Applied
Pham Toan Thang, T. Nguyen-Thoi, Jaehong Lee
Summary: The main goal of this research paper is to model and analyze bidirectional functionally graded nanobeams using the Timoshenko beam theory and nonlocal strain gradient theory. The study focuses on understanding mechanical behavior, calculating important parameters, and formulating equilibrium and stability equations for a detailed investigation. Specific examples are presented to verify the proposed solution, and the influences of material properties and nonlocal parameter on critical buckling load and transverse deflection are examined.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Engineering, Civil
Kareem Mohsen Raheef, Ridha A. Ahmed, Adil Abed Nayeeif, Raad M. Fenjan, Nadhim M. Faleh
Summary: This research presents dynamic response analysis of a porous functionally graded nanobeam under a moving point load. Factors like nonlocal strain gradient, pore distribution, and elastic medium are found to influence the dynamic deflection of the FG nanobeams. The study utilizes a higher-order refined beam model and NSGT to establish the nanobeam formulation.
GEOMECHANICS AND ENGINEERING
(2021)
Article
Construction & Building Technology
Linyun Zhou, Yasaman Najjari
Summary: This paper investigates the buckling analyses of nanocomposite plate reinforced by Graphene platelet using various models, and finds the effects of Graphene platelet volume percent and elastic medium on the buckling load.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Thermodynamics
Ahmed E. Abouelregal, Hamid M. Sedighi, Victor A. Eremeyev
Summary: This article proposes a photothermal model to study the thermo-magneto-mechanical properties of semiconductor materials. The model takes into account the optical heating through the semiconductor medium and uses a more reliable theoretical framework to describe the optical and heat transfer properties of these materials. Numerical calculations and analysis are used to investigate the effects of thermal parameters, electromagnetic fields, laser pulses, and thermoelectric coupling factors on the thermomagnetic behavior of the materials.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Mohammad Malikan, Victor A. Eremeyev
Summary: This study introduces a new approach to address micro-mechanic problems using the modified couple stress theory. The model considers micro-particles' rotations, which are crucial for microstructural materials and small scales. While the framework is suitable for static situations, it is necessary to consider micro-rotations' mass inertias for dynamic investigations. The solution methods are validated using numerical models, highlighting the importance of static and dynamic length scale parameters in studying microstructure vibrations.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Editorial Material
Mechanics
Anil Misra, Francois Hild, Victor A. Eremeyev
MECHANICS RESEARCH COMMUNICATIONS
(2023)
Article
Thermodynamics
Florian Massing, Sebastian Glane, Wolfgang H. Mueller, Victor A. Eremeyev
Summary: This paper examines the possibility of using Eringen's Generalized Continuum Theories as a model for human blood flow in microcirculation. The study suggests that a micromorphic fluid, which considers blood as a suspension of deformable particles (red blood cells) in a Newtonian fluid (blood plasma), accurately represents the behavior of blood flow in narrow capillaries. The flexibility of the substructure in the micromorphic fluid model plays a significant role in capturing the shear-thinning behavior observed in human blood. Rating: 8/10
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Thermodynamics
V. A. Eremeyev, Vl. Vas. Balandin, Vl. Vl. Balandin, A. M. Bragov, A. Yu. Konstantinov, L. A. Igumnov
Summary: In this study, tests were conducted on dry clay in a uniaxial stress state using the split Hopkinson pressure bar method. The compressive strength of the clay was determined as an important component of S.S. Grigoryan's soil medium model based on the experimental results. The parameters of this model were determined using the modified Kolsky method with a sample enclosed in a rigid cage. Special experiments were also carried out to verify the soil medium model by studying the penetration of a striker with conical tips into dry clay in a reversed setup. Numerical simulation of clay penetration under similar conditions to the reversed experiments was performed using the identified model in the LS-Dyna software package. The comparison of the results from physical and numerical experiments showed satisfactory agreement at a dry friction coefficient of 0.5.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Gennadi Mikhasev, Baris Erbas, Victor A. Eremeyev
Summary: This paper investigates the anti-plane shear waves in a domain composed of an infinite layer and a thin coating on an elastic half-space. The elastic properties of the coating, layer, and half-space are assumed to be different. Two possible regimes related to exponentially decaying waves in the half-space are found: the first one, called transversely exponential-transversely exponential (TE-TE) regime, is related to waves described by exponential functions in the transverse direction, and the second one, transversely harmonic-transversely exponential (TH-TE) regime, corresponds to waves in the upper layer exhibiting harmonic behavior in the transverse direction. Detailed analysis of the dispersion equations for both regimes is provided, including the effects of surface stresses, layer thickness, and the ratio of shear moduli of the upper layer and half-space on the dispersion curves.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Anatoly M. M. Bragov, Andrey K. K. Lomunov, Mikhail E. E. Gonov, Aleksandr Yu. Konstantinov, Leonid A. A. Igumnov, Victor A. A. Eremeyev
Summary: We discuss the deformation and destruction of fine-grained concrete B22.5 under dynamic loading through experimental and numerical studies. Experimental data is used to identify the dynamic component of two models in the LS-DYNA computational complex. The results show that the experimental strain rate dependences can significantly improve the predictive ability of the model.
Article
Engineering, Mechanical
Marco Zucca, Emanuele Reccia, Nicola Longarini, Victor Eremeyev, Pietro Crespi
Summary: This paper analyzes the structural behavior of an existing reinforced concrete bridge subjected to corrosion effects due to carbonation. An efficient procedure based on the implementation of a Finite Element Model (FEM) with Timoshenko beam elements is used. The safety level of the bridge is evaluated considering different load conditions and a retrofitting intervention is proposed.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Multidisciplinary
Stepan Konev, Victor A. Eremeyev, Hamid M. Sedighi, Leonid Igumnov, Anatoly Bragov, Aleksandr Konstantinov, Ayaulym Kuanyshova, Ivan Sergeichev
Summary: This article presents the experimental studies on the dynamic deformation and failure of a unidirectional carbon fiber reinforced plastic under compression. The results show that the strain rate significantly affects the strength and deformation characteristics of the material. The obtained results can be used to design structural elements operating under dynamic shock loads and to build models of mechanical behavior and failure criteria, considering the strain rate effects.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Victor A. Eremeyev
Summary: We discuss the ellipticity properties of an enhanced model of poroelastic continua called dilatational strain gradient elasticity. We show that the equilibrium equations are elliptic in the sense of Douglis-Nirenberg, which is more general than ordinary and strong ellipticity. The loss of ellipticity can be considered as a criterion for strain localization or material instability.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mechanics
Shahriar Dastjerdi, Mohammad Malikan, Bekir Akgoz, Omer Civalek, Victor A. Eremeyev
Summary: The research simulates the motion of the Earth's layers caused by internal pressures using an efficient mathematical model. By considering the Earth's rotation, the model provides more accurate results regarding the shape and displacement of the internal layers and tectonic plates. It also solves the fully nonlinear and dynamic differential equations using a semi-analytical polynomial method, which is an innovative and efficient approach.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Mohammad Malikan, Shahriar Dastjerdi, Victor A. Eremeyev, Hamid M. Sedighi
Summary: Smart composites are used in electro-mechanical systems and can exhibit advanced properties such as piezoelectricity and flexoelectricity. However, there is a lack of evaluation in three-dimensional (3D) elasticity analysis when the flexomagnetic effect exists in these composites. This study addresses this issue and demonstrates the importance of conducting 3D mechanical analyses.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mechanics
F. dell'Isola, V. A. Eremeyev, V. A. Korolenko, Y. O. Solyaev
Summary: This article investigates the deformation of an initially spherical elastic body, considering the influence of the gradient of displacements on the deformation energy. By applying radial dead loads along the equator of the sphere, the analysis focuses on a specific case of second gradient continua. Unlike in first gradient continua, it is shown that these forces do not cause infinite displacement, but instead, the displacements are finite, as demonstrated using a series method for the boundary-value problem. Therefore, there is no formation of an edge at the material points where the forces are applied in the deformed configuration.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Thermodynamics
Wolfgang H. Mueller, Victor A. Eremeyev
Summary: This article presents a review of the recent workshop on Micropolar Continua and beyond, held from March 28-31, 2023, at Technische University of Berlin, Germany.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Igor Berinskii, Victor A. Eremeyev
Summary: This study discusses the dynamics of a relatively simple origami-inspired structure using discrete and continuum models. The continuum model, derived from the discrete model, accurately captures the behavior of origami structures, which is important for determining material properties and conducting nondestructive evaluations.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(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)
