Article
Engineering, Multidisciplinary
Jalal Khaghanifard, Amir R. Askari, Mohsen Taghizadeh, Jan Awrejcewicz, Peter D. Folkow
Summary: This paper nonlinearly models cantilever-based functionally graded magneto-electro-elastic energy harvesters (FGMEEEH) for the first time. The coupled magneto-electro-mechanical model is obtained on the basis of the Euler-Bernoulli beam theory. A hybrid procedure including Ritz's method is then utilized to generate reduced order models for both asym-metric unimorph and symmetric bimorph configurations.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Energy & Fuels
E. F. Rojas, S. Faroughi, A. Abdelkefi, Y. H. Park
Summary: A reduced-order model considering material structure, size dependency, and surface smoothness effects was developed to study the performance of piezoelectric and/or flexoelectric systems at different scale levels. The study showed that at nanoscale, the combined piezoelectric and flexoelectric configuration and the flexoelectric only configuration perform similarly, but at transition scales, from nano to micro, the combined system outperforms either configuration. A non-smooth surface was found to increase the harvested power levels of the system in all cases, indicating that a piezoelectric-flexoelectric system can generate more power than previously thought near the microscale.
Article
Mechanics
M. C. Ray, B. K. Jha
Summary: This paper presents the exact solutions for plate type piezoelectric bimorph energy harvesters composed of laminated cross-ply or angle-ply substrate plate. The effects of series and parallel connections of the piezoelectric layers and different parameters on the induced electric potential have been studied.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Tran Quoc Thai, Xiaoying Zhuang, Timon Rabczuk
Summary: Flexoelectricity is a universal electro-mechanical coupling effect that occurs in dielectrics of all symmetric groups and becomes dominant at the micro- and nano-scales. It plays an important role in evaluating micro-electro-mechanical systems (MEMS) such as energy harvesters which convert vibrational energy to electric energy. At finer length scales, micro-inertia effects significantly contribute to the behavior of flexoelectric materials due to the mechanical dispersion. Hence, to properly characterize the vibrational behavior of MEMS, a reliable theoretical approach is required accounting for all possible phenomena that affect the output of the system such as voltage or power density. In this work, we present a consistent (dynamic) model and associated computational framework for flexoelectric structures to study the characteristics of the vibrational behavior of energy harvesters showing the dominance of the flexoelectric effect at micro- and nano-scales. In this context, we quantify the impact of the micro-inertia length scale and the flexoelectric dynamic parameter on both frequency and time responses of energy harvesters.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Multidisciplinary
David Ruiz, Sergio Horta Munoz
Summary: A milli-sized traveling wave actuator is designed in this paper by optimizing the polarization direction. Two different sets of electrodes are required to generate the traveling wave. The topology optimization method is utilized to obtain the optimal sets of electrodes that minimize the difference between a pure traveling wave and the deflection generated. Examples with different boundary conditions are presented to validate the model, overcoming classical issues in topology optimization.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Instruments & Instrumentation
Abhijeet M. Giri, S. F. Ali, A. Arockiarajan
Summary: This study presents analytical formulations for the assessment of induced strain and voltage in piezoelectric cantilevers, and validates the formulations through experiments. The study also analyzes the influences of various parameters on the results and provides guidelines for design and selection of parameters.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Shijing Zhang, Yingxiang Liu, Jie Deng, Xinqi Tian, Xiang Gao
Summary: A new two-DOF inertial rotary motor using a two-dimensional piezoelectric actuator with stick-slip mechanism was developed, achieving high rotary velocities and resolution. It held the advantages of smaller size and larger output speed, suitable for precision attitude adjustment systems.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Instruments & Instrumentation
Jianxing Li, Shijing Zhang, Yingxiang Liu, Jie Deng, Xuefeng Ma
Summary: An inertial impact locomotion robot (IILR) driven by piezoelectric bimorph actuators (PBAs) was developed for plane locomotion with multiple degrees of freedom. A simplified dynamic model and a prototype were established and tested to evaluate the robot's performance. The results showed that the IILR had a large carrying capability, multiple degrees of freedom, and no electromagnetic interference, making it suitable for precision positioning and carrying applications.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Tran Quoc Thai, Xiaoying Zhuang, Timon Rabczuk
Summary: Micro/nano-scale energy harvesters are an important technology for providing sustained energy solutions for micro/nano-electromechanical devices, and have attracted significant research interest in recent decades. This work explores the impact of curved shapes on the nonlinear vibration of energy harvesters and demonstrates the potential for improving their performance through tuning the structural curvature. By developing a piezo-flexoelectric curved beam model and using the multiple time scale method, the effect of structural curvature in nanoscale arc-shaped beams is quantitatively evaluated.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Jalal Khaghanifard, Amir R. Askari, Mohsen Taghizadeh
Summary: This study investigates the response of unimorph and bimorph cantilever-based functionally graded magneto-electro-elastic energy harvesters under mechanical shock. The influence of shock duration on the values of the harvested power is analyzed using the mass-spring shock spectrum diagram. The effects of various parameters on the performance of the harvesters are investigated through a detailed parametric study.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF MECHANICAL ENGINEERING
(2023)
Article
Instruments & Instrumentation
Yongfeng Fang, Kong Fah Tee, Lianghua Wen
Summary: This study investigates the structure and output voltage of a smart piezoelectric cantilever beam (SPCB), finding that the output voltage is positively proportional to the displacement of the beam's right end and is also influenced by factors such as the piezoelectric fiber material, electrode layer, thickness, width, and length of the SPCB.
SENSORS AND MATERIALS
(2021)
Article
Computer Science, Interdisciplinary Applications
Arthur Givois, Jean-Francois Deu, Olivier Thomas
Summary: This paper proposes a reduced-order modeling method to predictively simulate the dynamics of piezoelectric structures with geometric nonlinearities, which can efficiently perform numerical simulations and provide a convenient procedure for studying nonlinear dynamics. The focus is on the parametric effect resulting from the combination of geometric nonlinearities and piezoelectricity, with reference results provided for different test cases involving realistic structures.
COMPUTERS & STRUCTURES
(2021)
Article
Engineering, Mechanical
B. K. Jha, M. C. Ray
Summary: The exact solutions for the electro-elastic static response of simply supported doubly curved shell piezoelectric bimorph energy harvesters have been derived in this study. The effects of curvature, stacking sequence, and connections of the piezoelectric layers on the harvesting capability of the laminated composite shell harvesters are investigated. The obtained exact solutions can serve as benchmark solutions for validating numerical and experimental results.
INTERNATIONAL JOURNAL OF MECHANICS AND MATERIALS IN DESIGN
(2023)
Article
Engineering, Mechanical
Qi Liu, Weiyang Qin, Yongfeng Yang, Zhiyong Zhou
Summary: In this study, a novel vibration energy harvester is proposed, which can produce large outputs by utilizing the amplified inertial force of a mass acting on two clamped piezoelectric beams. The harvester performs well under low-frequency excitation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mechanics
A. Kaghazian, A. Hajnayeb, H. M. Sedighi
Summary: In this study, the nonlinear forced vibrations of a bimorph piezoelectric nanobeam were investigated using the nonlocal elasticity theory. The nanobeam was modeled using Euler-Bernoulli beam theory, and the equations of motion were obtained using the Hamilton principle. The derived equations were discretized using the Galerkin decomposition method with mode shapes of multi-span beams as test functions. The results of the study showed that size effects significantly influenced the dynamic behavior of the nanoactuators, with an increase in the nonlocal parameter leading to a decrease in the fundamental natural frequency of the nanobeam and an increase in the response amplitude.
JOURNAL OF APPLIED MECHANICS AND TECHNICAL PHYSICS
(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)