Article
Physics, Multidisciplinary
M. Alimoradzadeh, S. D. Akbas
Summary: This paper investigates the nonlinear dynamic behavior of cracked AFM under external influences, analyzes the effects of various parameters on its stability through numerical examples, and identifies the corresponding unstable regions.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Biology
Babak Alizadeh-Hamidi, Reza Hassannejad, Yadollah Omidi
Summary: Nanostructured lipid carriers are used to control drug release, with dynamic behavior affected by temperature. Using the Timoshenko beam model increases accuracy, while investigating bending vibrations of lipid nano-tubules has made progress.
COMPUTERS IN BIOLOGY AND MEDICINE
(2021)
Article
Mathematics, Applied
Mohammad Arhami, Hamid Moeenfard
Summary: The objective of this paper is to develop a modified strain gradient beam constraint model (MSGBCM) to improve the modeling accuracy of small-scale compliant mechanisms. By considering nano/micro flexure beams and P-flexures, closed-form expressions for the nonlinear load-displacement relationships and stiffness values are derived. The results show that the modified model provides a more accurate description of the behavior of small-scale compliant mechanisms.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Engineering, Mechanical
Babak Ramazani Darvazi, Javad Rezapour, Saeed Rouhi, Raheb Gholami
Summary: In this paper, the nonlinear vortex-induced vibration of electrostatically actuated microbeam is studied based on modified strain gradient theory. The effects of mid-plane stretching, electrostatic actuation, Casimir and intermolecular forces are considered. By applying the Hamilton's principle and using the Galerkin method, the governing equations of motion are derived and the dynamic response and various characteristics are analyzed.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Aerospace
Hu Liu, Qiao Zhang, Jingxuan Ma
Summary: This paper theoretically examines the thermo-mechanical behaviors of a two-dimensional functionally graded microbeam under a moving load using the modified couple stress theory and finite element method. The findings can serve as a guideline for assessing the thermal performance of microstructures subjected to a moving load.
Article
Engineering, Multidisciplinary
Armagan Karamanli, Thuc P. Vo
Summary: A finite element model for the structural behaviors of bi-directional FG porous microbeams is proposed, utilizing a modified strain gradient theory and varying material length scale parameters and porosity. The study explores the effects of variable MLSP and porosity, as well as gradient index in two directions, on the deflections, natural frequencies, and buckling loads of 2D FG porous microbeams.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Computer Science, Interdisciplinary Applications
Lieu B. Nguyen, Chien H. Thai, Ngoc Duong-Nguyen, H. Nguyen-Xuan
Summary: This study presents a method using modified strain gradient theory and higher-order shear deformation theory to study the electromechanical vibration analysis of functionally graded piezoelectric porous microplates for the first time. The study considered two porosity distribution types and investigated the effects of external electric voltages, power-law index, porosity coefficient, porosity distribution, and various boundary conditions on the natural frequencies of the microplates through numerical analysis.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Multidisciplinary
Mohammadreza Eghbali, Seyed Amirhosein Hosseini, Mehdi Pourseifi
Summary: This paper investigates the free lateral vibration of a cracked nano-beam under Euler-Bernoulli beam theory and nonlocal strain gradient theory, taking into account piezoelectric effects. The effects of crack propagation, crack intensity, piezoelectric effects, longitudinal scale parameter, and nonlocal parameter on the dynamic behavior are studied.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Civil
Gui-Lin She, Hai-Bo Liu, Behrouz Karami
Summary: This paper presents an analysis of forced resonance vibration of curved micro-size beams made of graphene nanoplatelets reinforced polymer composites. Various parameters such as length scale coefficients, opening angle, weight fraction, and the total number of layers in GNPs are discussed in detail for their influences on the composite curved microbeams. The study demonstrates that changing these parameters significantly affects the resonance position.
THIN-WALLED STRUCTURES
(2021)
Article
Physics, Multidisciplinary
Hao Wei, Reza Mohammadi
Summary: This study investigates the bending and free vibration analysis of CNTRC doubly curved nanoshells subjected to hygro-thermo-mechanical loading using higher-order shear and normal deformation theory. It considers thickness stretching impact, utilizes sinusoidal shear deformation theory, applies nonlocal strain gradient shell theory, and studies the impacts of different types of CNTRC distributions on the bending and natural frequency of nanoshells. The results show that the length scale parameter has a significant impact on the deflection and natural frequency of the CNTRC doubly curved nanoshells.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Computer Science, Interdisciplinary Applications
M. M. Keleshteri, J. Jelovica
Summary: This paper investigates the nonlinear vibration behavior of bidirectional porous beams with non-uniform porosity distribution and proposes a new porosity distribution to maximize natural frequencies. Numerical methods are used to discretize and solve the nonlinear dynamic equations, showing that the newly defined porosity distribution can increase frequencies, with higher porosities near the center further increasing frequencies.
ENGINEERING WITH COMPUTERS
(2021)
Article
Mechanics
Omer Civalek, Hakan Ersoy, Busra Uzun, Mustafa Ozgur Yayli
Summary: This study investigates the effects of deformable boundary and porosity on the free vibration characteristics of functionally graded restrained Rayleigh microbeams made of metal foam under two-parameter elastic foundations through eigenvalue analysis for the first time. The porosity distribution of the microbeam is assumed to change along the height of the metal foam. The study considers size effects using nonlocal strain gradient elasticity theory and constructs a system of linear equations based on Fourier sine series. The analysis reveals that all parameters, including strain gradient, nonlocal effect, material distribution, spring parameter, elastic medium, and rotary inertia, influence the free vibration response of the restrained microbeam.
Article
Mechanics
Ziwen Guo, Yilin Qu, Gongye Zhang, Changwen Mi
Summary: This paper develops a second-order model to study the wave propagation in a magneto-electro-elastic microbeam, considering various deformations and using modified couple stress theory. The numerical results show that the wave frequencies in the present model are always larger than those in the classical model, and the effect of couple stress is significant when the microbeam thickness is very small. It is also found that the cutoff frequency is inversely proportional to material size. The study provides a mathematical explanation for the cutoff frequency influenced by couple stress effects and reveals interesting results regarding the cutoff frequency of the symmetric shear.
Article
Mathematics, Applied
Jingnong Jiang, Liaoliang Ke
Summary: This paper investigates the impact of surface roughness on the linear and nonlinear free vibration behaviors of microbeams based on the strain gradient theory. Closed-form solutions for strain gradient beams are obtained and nonlinear vibration is analyzed using the linear mode and Galerkin's method. A parametric study is conducted to explore the influences of various factors on the vibration behaviors of strain gradient beams. The findings of this study can contribute to the optimal design and fabrication of micro-/nano-resonators.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Mechanics
Varun Jain, Rajesh Kumar, S. N. Patel, Tanish Dey
Summary: This article uses a semi-analytical approach to investigate the nonlinear vibration and response of a damped porous microplate under nonuniform periodic parametric excitation. The study aims to understand the complete nonlinear dynamic behavior of the plate by considering factors such as small-scale effects, shear deformation, and various parameters. The results provide insights into the mode shape, nonlinear vibration, and nonlinear response, including the dependence of initial displacements on the frequency-amplitude curves.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Engineering, Aerospace
Ali Akbar Pasha Zanoosi, Mohammadreza Mallakzadeh, Reza Kalantarinejad
Article
Mechanics
M. Feri, A. Alibeigloo, A. A. Pasha Zanoosi
Article
Mechanics
A. A. Pasha Zanoosi, D. Naderi, M. Sadeghi-Mehr, M. Feri, A. Sh. Beheshtiha, K. Fallahnejad
MULTIBODY SYSTEM DYNAMICS
(2015)
Article
Engineering, Mechanical
A. A. Pasha Zanoosi, M. Haghpanahi, R. Kalantarinejad
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2017)
Article
Chemistry, Physical
Hamidreza Farhoudi, Reza H. Oskouei, Ali A. Pasha Zanoosi, Claire F. Jones, Mark Taylor
Article
Engineering, Mechanical
A. A. Pasha Zanoosi, R. Kalantarinejad, M. Haghpanahi
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS
(2018)
Article
Engineering, Multidisciplinary
A. Shooshtari, A. A. Pasha Zanoosi
APPLIED MATHEMATICAL MODELLING
(2010)
Article
Engineering, Multidisciplinary
A. Alibeigloo, A. A. Pasha Zanoosi
APPLIED MATHEMATICAL MODELLING
(2013)
Article
Mathematics, Applied
S. H. Nourbakhsh, A. A. Pasha Zanoosi, A. R. Shateri
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2011)
Article
Mathematics, Applied
D. Naderi, A. A. Pasha Zanoosi, M. Sadeghi-Mehr
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2012)
Article
Mathematics, Applied
M. Mallakzadeh, A. A. Pasha Zanoosi, A. Alibeigloo
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2013)
Article
Engineering, Mechanical
Ali Akbar Pasha Zanoosi, Mohammadreza Mallakzadeh, Reza Kalantarinejad
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF MULTI-BODY DYNAMICS
(2015)
Article
Ecology
Javad Najafi, Azita Farashi, AliAkbar Pasha Zanoosi, Roya Yadreh
EUROPEAN JOURNAL OF WILDLIFE RESEARCH
(2019)
Article
Mechanics
A. Alibeigloo, A. A. Pasha Zanoosi
COMPOSITE STRUCTURES
(2017)