Article
Materials Science, Multidisciplinary
Xiaoying Zhuang, Chuong Nguyen, S. S. Nanthakumar, Ludovic Chamoin, Yabin Jin, Timon Rabczuk
Summary: This paper presents a methodology for inverse design of reconfigurable topological insulators in plate-like structures. By utilizing topology optimization and piezoelectric patches, the space inversion symmetry is broken, leading to the real-time reconfigurability of topological interfaces for waveguide applications.
MATERIALS & DESIGN
(2022)
Article
Engineering, Mechanical
Chen Sun, Liang Wang, Heng Jiang, Qian Ding, Zhanli Liu, Yongtao Sun, Xinghao Wang
Summary: This paper proposes a multistage grid-pixel refinement method (MGPRM) combined with genetic algorithm to quickly obtain high-quality topology of Phononic crystal (PnC) by optimizing the bandgap. The results show that the MGPRM combined with the optimization algorithm can provide high-quality original configurations for tunable parameterized microstructures, and it has higher quality and a faster convergence rate compared to different densities of invariant grids and traditional refinement methods.
EXTREME MECHANICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Anna Dalklint, Mathias Wallin, Katia Bertoldi, Daniel Tortorelli
Summary: Topology optimization is applied to design mechanically tunable phononic bandgap materials. A periodic media model is considered, and dispersion relations are obtained by analyzing a single unit cell subjected to Floquet-Bloch boundary conditions. A finite macroscopic deformation is applied to the unit cell to modify its geometry and dispersion. The dispersion-deformation relation is tuned by solving a topology optimization problem using nonlinear programming.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Physics, Applied
Chaoyu Sun, Ailing Song, Yanxun Xiang, Fu-Zhen Xuan
Summary: This paper proposes a phononic crystal filter to purify the ultrasonic signal in nonlinear guided wave testing. The design principle, theoretical analysis, and numerical simulations of the proposed filter are introduced, and the results demonstrate its applicability in low-frequency S0 mode Lamb wave nonlinear harmonic wave testing.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Yan-Feng Wang, Li Yang, Ting-Ting Wang, A-Li Chen, Vincent Laude, Yue-Sheng Wang
Summary: The study demonstrates the manipulation of Lamb waves guided along reconfigurable phononic circuits by adjusting defects in a solid phononic crystal slab. The guiding frequency is found to be independent of waveguide details, which is significant for the design of reconfigurable phononic devices. Both numerical and experimental results show good agreement.
Article
Chemistry, Multidisciplinary
Hongbo Zhang, Shaobo Zhang, Jiang Liu, Bilong Liu
Summary: This paper realizes the Weyl points of shear horizontal guided waves through one-dimensional phononic crystal plates and proves the existence of topological phase interface states, demonstrating the potential of one-dimensional plate structural systems in detecting higher-dimensional topological phenomena.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Multidisciplinary
Qiangbo Wu, Jingjie He, Wenjiong Chen, Quhao Li, Shutian Liu
Summary: This study proposes a novel topology optimization method for the prescribed band gaps design of phononic crystal. The difficulty lies in the correlation between stiffness matrix and wave vector, and a modified Heaviside function is proposed to overcome numerical convergence difficulties. The Robust formulation is also applied to eliminate checkerboard phenomena and control the minimum size in topology optimization. Numerical examples validate the effectiveness of the developed method.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Acoustics
Lingyun Yao, Denghao Zhang, Ke Xu, Liqiang Dong, Xingzheng Chen
Summary: This paper investigates the topological properties of subwavelength bands in elastic phononic crystal (PC) plate hybridized with extra local resonances, and analyzes the band-structure evolution of a topological PC plate with local resonator using finite element method (FEM). The structure is capable of producing two bandgaps in the subwavelength region, and experimental tests validate the theoretical and numerical approach to the design of topological waveguides.
Article
Mechanics
Atul Kumar Sharma, Majd Kosta, Gal Shmuel, Oded Amir
Summary: Dielectric elastomers are active materials that change modulus under electric fields. Current research focuses on improving the performance of adaptive phononic crystals by utilizing a gradient-based optimization method to maximize band gap width. This new method outperforms traditional metaheuristics-based topology optimization in terms of wider prohibited frequency bands and reduced computational cost.
COMPOSITE STRUCTURES
(2022)
Article
Instruments & Instrumentation
Zhiwen Wang, Chuanping Zhou, Yuan Dong, Shunpeng Zhu, Wanrong Pei, Jiayou Weng
Summary: Based on Mindlin's theory and the plane wave expansion method, formulas were proposed for the governing equations and dispersion relations of bending waves in piezoelectric phononic crystal plates. Shear correction factors can be obtained through transcendental equations based on forced vibrations of the plate. The inclusion shape and lattice type of the plates have a dramatic effect on the mid-to-high frequency band gaps. Piezoelectric materials exhibit distinct eigenfrequencies at the high-symmetry point UGamma at low frequencies. Thickness and cuts influence the band gap width differently than in two-dimensional models.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Acoustics
Hao Gao, Yegao Qu, Guang Meng
Summary: Phononic crystals are engineered structures with unique acoustic properties that cannot be found in natural materials. These crystals exhibit band gaps where wave propagation is prohibited due to their periodic structure. This article presents a method using a generalized plane wave expansion and voxel-based discretization to calculate the band structures of three-dimensional phononic crystals. The proposed method, integrated with an adaptive genetic algorithm, is used for topological optimization of constituent distribution to maximize the width of the band gap. Numerical results validate the effectiveness of the method for optimizing a cubic phononic crystal, and the eigenmodes of the optimized crystal are investigated to better understand the mechanism of band gap broadening.
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Fan Yang, Zhuhua Tan, Xu Han, Chongdu Cho
Summary: A graded negative refraction index phononic crystal plate lens was designed using a method of rotating scatterers, showing significant focusing efficiency, and providing a new way for fabricating energy harvesting devices.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Chengxin Cai, Guangchen He, Zhoufu Zheng, Yao Qin, Jianfei Yin
Summary: In this study, the edge states of a designed elastic phononic crystal plate were modulated to achieve greater degrees of freedom and enhanced backscattering suppression capabilities. Straight boundary, right-angle turning boundary, and valley topological transport with defect and disordered boundary were achieved by utilizing edge states. Experimental validation confirmed the robustness against immunodeficiency and holes. The relative width of the topological band gap in the elastic wave system examined in this study exceeds 60%, offering significant advantages and potential for practical applications. This research contributes new insights for engineering applications of ultra-wideband acoustic antennas, acoustic logic control, and other devices.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Xing Zhang, Hongling Ye, Nan Wei, Ran Tao, Zhen Luo
Summary: This study successfully designed three-dimensional metamaterials with negative thermal expansion and phononic bandgap properties using the independent continuous mapping (ICM) topology optimization method and a surrogate model-based optimization method.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Yueting Wang, Jian Li, Yuxin Fu, Ronghao Bao, Weiqiu Chen, Yue-Sheng Wang
Summary: The article investigates the deformation behavior and wave propagation characteristics of a defected phononic crystal, showing that localized states appear due to the presence of the line defect. The results suggest that the phononic crystal with line defect can control guided waves through uniaxial compression, paving a new way for designing tunable elastic waveguides.
Article
Engineering, Multidisciplinary
Joost Segers, Saeid Hedayatrasa, Gaetan Poelman, Wim Van Paepegem, Mathias Kersemans
Summary: A non-destructive testing procedure using full wavefield measurement and low-power piezoelectric actuator excitation is proposed for damage detection in composites. Specific nonlinear components are extracted using a time-frequency filtering method, and damage maps are constructed through broadband bandpower calculation, showing high performance for defect detection.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Engineering, Mechanical
Joost Segers, Saeid Hedayatrasa, Gaetan Poelman, Wim Van Paepegem, Mathias Kersemans
Summary: A self-reference broadband version of the local wavenumber estimation (LWE) technique is proposed in this study to detect and characterize defects in composite structures. By injecting broadband vibrations using different methods and analyzing the surface response, this approach allows for automation and improved defect characterization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Civil
Liujie Chen, Jiyang Fu, Yahui Mei, Di Huang, Ching-Tai Ng, Haodong Yao
Summary: This study investigates the characteristics of residual sequence from time series black box models, using Lagrange Multiplier (LM) test to evaluate its nonlinearity and non-stationarity. The study also proposes the use of permutation entropy to measure the complexity, randomness, and fluctuation of the residual sequence, establishing a correlation with structural abnormal response signal and safety state. The effects of operational variability, damage, and coupling disturbance on the residual-permutation entropy (R-PE) are analyzed in detail.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Alireza Ghiasi, Mahdi Kazemi Moghaddam, Ching-Tai Ng, Abdul Hamid Sheikh, Javen Qinfeng Shi
Summary: This paper proposes a practical vibration-based deep learning approach for damage classification in railway bridges. The approach uses vibration-based Convolutional Neural Networks (CNNs) to classify various extents of cross section losses due to damages like corrosion. The method is validated through field testing and simulated corrosion scenarios. The results show that the proposed method can achieve accurate damage classification close to 100%.
ENGINEERING STRUCTURES
(2022)
Review
Engineering, Mechanical
Thangamuthu Mohanraj, Mohammad Uddin, Sevagoundanoor Karuppusamy Thangarasu
Summary: This article discusses the importance of cutting force measurement and the methods of using piezoelectric and piezoresistive transducers for measurement. It also emphasizes the importance of measuring vibration signals for analyzing the machining process.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Tingyuan Yin, Ching Tai Ng, James Vidler, Van Dac Ho, Andrei Kotousov
Summary: This study proposes an amplitude-modulation vibro-acoustic (AMVA) technique to track the evolution of thermal damage in pristine graphene mortar. The results show that the proposed AMVA technique is more sensitive and feasible to serve as the tool for thermal damage detection in cement-based material.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Uddin, Remi Santifoller, Colin Hall, Thomas Schlaefer
Summary: In this study, the influence of grinding-burnishing on the surface integrity, mechanical properties, and corrosion performance of laser-clad Stellite 21 alloys coating was investigated. The results showed that grinding-burnishing improved surface finish, reduced surface porosity, increased hardness and wear resistance, and improved impact resistance. Burnishing also flattened grains and reduced surface undulations. Furthermore, grinding-burnishing at a force of 509 N improved corrosion resistance compared to grinding alone.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Characterization & Testing
Hankai Zhu, Ching Tai Ng, Andrei Kotousov
Summary: Evaluation of fatigue damage using nonlinear guided wave mixing has been extensively studied. Combinational harmonics resulting from wave mixing of quasi-synchronized wave modes have attractive features and are sensitive to fatigue damage. However, limited research has been done on the frequency pair selection and time shifting of wave mixing signals. This study proposes a method and theoretical equations to guide the selection of wave mixing frequency pairs and introduces a new time shifting technique to enhance the generation of harmonics. These findings can further advance the development of damage detection methods using guided wave mixing.
NDT & E INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Gustavo Henrique Nazareno Fernandes, Victor Tallis Bazon, Lucas Melo Queiroz Barbosa, Pedro Henrique Pires Franca, Marcio Bacci da Silva, Mohammad Uddin, Paulo Sergio Martins, Alisson Rocha Machado
Summary: High heat generation in machining processes affects tool life and workpiece quality. Conventional cutting fluid cooling has environmental hazards and high manufacturing costs. This study evaluates the performance of a novel internally cooled tool for machining grey cast iron, which effectively removes heat from the interface. The results show that the internally cooled tool reduces surface roughness and increases microhardness and machining performance, indicating its potential as an eco-friendly and efficient technique.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Characterization & Testing
Zongfei Tong, Saeid Hedayatrasa, Liangliang Cheng, Cuixiang Pei, Zhenmao Chen, Shejuan Xie, Mathias Kersemans
Summary: This paper proposes a parametrized 3D finite element (FE) framework for simulating optical infrared thermographic inspection of multi-layer anisotropic media and generating a large-scale virtual dataset. The interface element is introduced for simulating various defect types, and non-uniform heating conditions and a stochastic morphology generator are used for realistic simulation. The trained Faster-RCNN model demonstrates excellent performance on experimental thermographic data.
NDT & E INTERNATIONAL
(2023)
Article
Neurosciences
Jinhang Wu, Chang Jiang, Han Fang, Ching-Tai Ng
Summary: This paper evaluates the feasibility of using the feature guided wave (FGW) technique to detect weld defects in steel T-welded joint structures. The Semi-Analytical Finite Element (SAFE) method is used to obtain modal solutions in the waveguide, and a new algorithm is developed to obtain FGW modes with high energy concentration and low attenuation. The study confirms the capability and robustness of the identified FGW mode (RTW) in detecting small weld defects.
Review
Engineering, Biomedical
Vincent Santos, Mohammad Uddin, Colin Hall
Summary: The present paper provides an overview of mechanical surface modification technologies for different Mg alloys. Five main treatment strategies and their effects on surface roughness, texture, and microstructure were discussed. The influence of process parameters on deformation and degradation characteristics, as well as the potential and advances in new and emerging treatment strategies, were thoroughly reviewed. This review contributes to bridging the current gap in surface modification technology for Mg alloys and offers useful insights and guidance for developing new treatment routes.
JOURNAL OF FUNCTIONAL BIOMATERIALS
(2023)
Article
Materials Science, Composites
Zige Xu, Wen Yip, Zheng Dong, Mohammad Uddin, Graham Stevens
Summary: In this study, a laser surface pre-treatment strategy was applied to aluminium 7075-T6 alloy to achieve the best modified surface wettability. The laser-treated surface at a laser power of 30 W, speed of 1.2 m/s and frequency of 8 kHz showed the highest surface wettability, with a contact angle of 17°, attributed to deeper surface cavities and higher roughness. The laser treatment increased the adhesion strength up to 8.5 MPa, nearly matching that of oxalic acid treatment, indicating its effectiveness in providing adequate strength in adhesively bonded joints.
COMPOSITE INTERFACES
(2023)
Article
Acoustics
Hankai Zhu, Andrei Kotousov, Ching Tai Ng
Summary: This article proposes a quasi-fundamental antisymmetric mode of edge wave (QEA0) for evaluating defects on curved edges. Compared with the conventional guided waves and its symmetric counterpart (QES0), the QEA0 mode has a longer propagation distance and better defect sensitivity, allowing it to distinguish multiple defects and determine their locations. Therefore, the QEA0 mode shows great potential for non-destructive evaluation and structural health monitoring of structural edges with complex cross-sectional areas.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Saeid Hedayatrasa, Wim Van Paepegem, Mathias Kersemans
Summary: The technique of thermal wave radar or pulse compression thermography, which utilizes a broadband modulated excitation signal and its cross-correlation with the thermal response, is widely used in active infrared thermography for defect characterization. However, the distortion of the thermal response due to heat diffusion affects the efficiency of cross-correlation analysis, especially for deep defects or materials with different thermal diffusivity. To overcome this issue, diffusion-compensated correlation analysis (DCCA) thermal signal is proposed, using a frequency-modulated sweep signal as an excitation waveform. DCCA can accurately analyze the thermal response in the presence of measurement noise, and can directly map the corresponding depth or diffusivity based on a library of template thermal responses. The performance of DCCA is analytically substantiated and verified through simulations and experiments on carbon fiber reinforced polymer plates, showing its superiority over thermal wave radar. The technique has potential for thermographic inspection of materials with artificial defects.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Yanzheng Wang, Qian Wu, Yiran Tian, Guoliang Huang
Summary: This paper proposes the microstructure design of an odd plate and investigates the directional wave energy amplification and the presence of interface waves in odd plates through theoretical and numerical analysis. The research findings contribute to the understanding of elastic behavior in 2D non-Hermitian systems.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
F. Greco, D. Codony, H. Mohammadi, S. Fernandez-Mendez, I. Arias
Summary: This study overcomes the difficulty of harnessing the flexoelectric effect by designing multiscale metamaterials. Through topology optimization calculations, we obtain optimal structures for various apparent piezoelectric properties and find that low-area-fraction lattices are the preferred choice. The results show competitive estimations of apparent piezoelectricity compared to reference materials such as quartz and PZT ceramics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xiaoxuan Zhang, Tryaksh Gupta, Zhenlin Wang, Amalie Trewartha, Abraham Anapolsky, Krishna Garikipati
Summary: This study presents a computational framework for coupled electro-chemo-(nonlinear) mechanics at the particle scale in solid-state batteries, including interfacial fracture, degradation in charge transfer, and stress-dependent kinetics. The discontinuous finite element method allows for arbitrary particle shapes and geometries.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Chengguan Zhang, Xavier Balandraud, Yongjun He
Summary: The coexistence of both austenite and martensite is a common characteristic in Shape Memory Alloys (SMAs). The multiple-domain microstructures, consisting of austenite, martensite twins, and individual martensite variants, evolve collectively during the phase transformation, affecting the material's macroscopic response. This paper presents an experimentally observed interface consisting of five domains in a Ni-Mn-Ga single-crystal, and analyzes the effects of thermal loading path and material initial state on the domain pattern formation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Shaobao Liu, Haiqian Yang, Guang-Kui Xu, Jingbo Wu, Ru Tao, Meng Wang, Rongyan He, Yulong Han, Guy M. Genin, Tian Jian Lu, Feng Xu
Summary: The balance between stress and adhesion plays a crucial role in governing the behaviors of adherent cells, such as cell migration. In certain microenvironments, such as tumor, variations in hydrostatic pressure can significantly impact cell volume and adhesion, which in turn affects cell behavior.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xun Xiong, Qinglei Zeng, Yonghuan Wang, Ying Li
Summary: In this work, the authors investigate the possibility of enhancing the resistance to crack growth in brittle materials through microstructure design. They establish a computational framework to simulate crack propagation and characterize fracture energy. The effects of different types of voids on toughening mechanisms are explored, and the critical conditions for embrittlement-toughening transition are identified. The study also discusses the difference between void toughening in brittle and ductile materials, and extends the toughening strategy to nacre-like materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Huan Wang, Yong-Quan Liu, Jiu-Tao Hang, Guang-Kui Xu, Xi-Qiao Feng
Summary: This study establishes a cytoarchitectural model to accurately capture the buckling and postbuckling behaviors of epithelia under fast compression. The stress evolution of epithelia is divided into three stages: loading, phase transition, and stress recovery. The postbuckling process is governed by the active tension generated by the actomyosin network. The study also proposes a minimal model that predicts the flattening time and stress recovery extent as functions of applied strain or strain rate, in agreement with simulations and experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Lei Liu, Hao Liu, Yuming He, Dabiao Liu
Summary: This study investigates the mechanics and topologically complex morphologies of twisted rubber filaments using a combination of experiment and finite strain theory. A finite strain theory for hyperelastic filaments under combined tension, bending, and torsion has been established, and an experimental and theoretical morphological phase diagram has been constructed. The results accurately determine the configuration and critical points of phase transitions, and the theoretical predictions agree closely with the measurements.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Abhishek Painuly, Kunnath Ranjith, Avinash Gupta
Summary: This paper analyzes the interfacial waves caused by frictional slipping and studies their dispersion relation and wave modes. By studying the slip waves in a geophysical model, the surface wave dispersion phenomenon is explored, and an alternative explanation is proposed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Houlin Xu, Joshua Vievering, Hoang T. Nguyen, Yupeng Zhang, Jia-Liang Le, Zdenek P. Bazant
Summary: Motivated by the extraordinary strength of nacre, this study investigated the probabilistic distribution of fishnet strength using Monte Carlo simulations and found that previous analytical solutions are not applicable for fishnets with a large number of links. By approximating large-scale fishnets as a continuum with cracks or holes, the study revealed that the strength distribution follows the Weibull distribution. This new model has significance for optimizing the strength-weight ratio in printed material structures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Souhayl Sadik, Arash Yavari
Summary: This paper revisits the mathematical foundations of nonlinear viscoelasticity and studies the geometry of viscoelastic deformations. It discusses the decomposition of the deformation gradient into elastic and viscous distortions and concludes that the viscous distortion can only be a two-point tensor. The governing equations of nonlinear viscoelasticity are derived and the constitutive and kinetic equations for various types of viscoelastic solids are discussed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Wen Cheng, Hongkuan Zhang, Yu Wei, Kun Wang, Gengkai Hu
Summary: In this study, we propose a phenomenon similar to Thouless pumping for a continuous in-plane elastic system, enabling topological transport of elastic waves through spatial modulation of material elasticity. By incorporating specific lattice microstructures, termed pentamode materials, precise and robust control over elastic wave propagation is achieved.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Linda Werneck, Mertcan Han, Erdost Yildiz, Marc-Andre Keip, Metin Sitti, Michael Ortiz
Summary: We have developed a simple model that describes the ionic current through neuronal membranes by considering the membrane potential and extracellular ion concentration. The model combines a simplified Poisson-Nernst-Planck model of ion transport through individual ion channels with channel activation functions calibrated from experimental data. The calibrated model accounts for the transport of calcium, sodium, potassium, and chloride and shows remarkable agreement with experimentally measured current-voltage curves for human neural cells.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
