Article
Materials Science, Multidisciplinary
Ali Zolfagharian, Peter Picken, Mahdi Bodaghi, Mohammad Fard, Bernard Rolfe
Summary: This research introduces a novel approach using metamaterials to improve the vibration isolation capacity of car seats. By developing metamaterial springs with high-static and low-dynamic stiffness, embedded in polyurethane foam, vibration isolation can be achieved. The study demonstrates the practical applications of implementing metamaterials into polyurethane foam under dynamic loading.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Acoustics
M. Utku Demir, Cetin Yilmaz
Summary: This study introduces a modular vibration isolator design that allows the adjustment of horizontal stiffness in three axes by changing compressive forces on leg modules. The system utilizes a multi-string tensioning mechanism to change the axial compressive forces on all elastic stepped columns simultaneously. Experimental and modeling results show that the proposed isolator has a wide isolation bandwidth.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Dileep Bonthu, H. S. Bharath, Siddappa I. Bekinal, P. Jeyaraj, Mrityunjay Doddamani
Summary: This study investigates the mechanical buckling and free vibration behavior of functionally graded sandwich foams (FGSFs) produced via three-dimensional printing (3DP). The study explores the effects of filler percentage on the density, critical buckling load, natural frequency, and damping factor of the FGSFs. The research provides valuable insights for the field of 3D printing and presents important findings regarding the buckling behavior and frequency characteristics of 3D printed FGSFs.
RAPID PROTOTYPING JOURNAL
(2023)
Article
Physics, Multidisciplinary
Muhammad, John Kennedy, Oluwaseyi Ogun
Summary: This study implemented forward and inverse design methods using numerical simulations and machine learning to design and fabricate an architected composite metastructure with subwavelength and ultrawide bandgaps. The presence of subwavelength and ultrawide bandgaps was confirmed through numerical wave transmission curves and experimental tests. The proposed composite metastructure will have widespread applications in structural vibration control and shock absorption.
NEW JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Runsheng Hou, Peng Dong, Yuqing Liu
Summary: The conventional lozenge structure exhibits its inherent auxeticity while buckling during compression. The novel lozenge-chiral auxetic metamaterials, combining different inner chiral structures with traditional outside lozenges, are suggested to enhance auxeticity and improve structural stability. Numerical simulations were conducted to investigate the deformation behavior, stress-strain curves, and Poisson's ratios of various LCAMs schematics. The proposed LCAMs demonstrated enhanced auxeticity and mechanical stability, making them promising for industrial applications.
Article
Engineering, Mechanical
Sudheendra Herkal, Muhammad M. Rahman, Satish Nagarajaiah, Vijay Vedhan Jayanthi Harikrishnan, Pulickel Ajayan
Summary: Schwarzites are 3D solids with negative Gaussian curvatures that possess unique mechanical properties such as high ductility and strength. The energy dissipation mechanism of Schwarzites allows for the removal of energy from dynamic systems and reduction of system response. Experimental results show that Schwarzite geometry can increase the damping ratio by almost 80% with the same material volume as a solid support. Additionally, Schwarzites exhibit vibration isolation properties.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
David M. J. Dykstra, Coen Lenting, Alexandre Masurier, Corentin Coulais
Summary: A new method for passive vibration damping is introduced, which allows buckling of the load path in mechanical metamaterials and lattice structures. This nonlinear mechanism results in an extreme damping coefficient, making it applicable in aerospace, vehicles, and sensitive instruments.
ADVANCED MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Rui Zhou, Zhen Yu, Zhenzhen Wu, Chang Qu, Yan Song, Ruizhe Xing, Jie Kong
Summary: Metamaterials (MMs) with artificial structures have exceptional physical properties. By designing and arranging unit structures with special physical properties, electromagnetic wave absorption (MMAs) can be achieved. Subwavelength scale unit structures are essential for surpassing the performance limits of bulk materials, and matching the manufacturing processes is crucial. The rapidly developing 3D printing technology provides a simple and efficient manufacturing method for researching and preparing MMAs. This review introduces the concept and development of MMAs, focuses on using 3D printing technology to manufacture MMAs, and discusses the limitations and prospects of combining MMs and 3D printing.
SCIENCE CHINA-MATERIALS
(2023)
Article
Acoustics
Shitong Fang, Keyu Chen, Bao Zhao, Zhihui Lai, Shengxi Zhou, Wei-Hsin Liao
Summary: Vibration is a sustainable energy source for wireless sensor nodes, but it can have detrimental effects. The simultaneous energy harvesting and vibration isolation at low frequencies is still an open issue. In this study, a novel device with a quasi-zero-stiffness support and multiple nonlinear monostable piezoelectric energy harvesters is proposed. Simulation results show that the proposed device has improved power generation and energy harvesting frequency bandwidth compared to its linear counterpart.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Chemistry, Multidisciplinary
Kun Peng Zhang, Yan Fei Liao, Bin Qiu, Yue Kun Zheng, Ling Ke Yu, Gong Han He, Qin Nan Chen, Dao Heng Sun
Summary: This research uses projection micro-stereolithography 3D printing technology and liquid metal filling method to manufacture conformal and 3D metamaterials, improving transmission properties of the metamaterial devices by optimizing filling channel layout and surface post-treatment process.
Article
Crystallography
Qi Li, Mingquan Zhang
Summary: This paper investigates an elastic metamaterial with hexagonal unit cells, where pentamode bands or band gaps at low frequencies are obtained by varying the inner structures. The effects of structural and geometric parameters on the band width of pentamode bands or band gaps are analyzed. Simulations using the finite element method show that the metamaterial can be applied as pentamode metamaterials or vibration isolation materials.
Article
Chemistry, Multidisciplinary
Christopher John Stevens, Ioannis Spanos, Andrea Vallechi, Jack McGhee, William Whittow
Summary: This report presents a novel fabrication method that uses fused deposition modeling to create dielectric molds, which are then filled with Field's metal to form conductive structures. The method shows potential for creating complex 3D architectures and functional metamaterial devices.
Article
Engineering, Manufacturing
Yizhen Zhu, Tengteng Tang, Suyi Zhao, Dylan Joralmon, Zachary Poit, Bhushan Ahire, Sanjay Keshav, Aaditya Rajendra Raje, Joshua Blair, Zilong Zhang, Xiangjia Li
Summary: Functional optics has become a hot topic due to their wide usage in diverse fields, but the complexity and multi-material distribution of advanced optical devices have hindered their development. However, additive manufacturing has shown its potential to produce multi-material, multi-scale, and multi-functional optical devices.
ADDITIVE MANUFACTURING
(2022)
Article
Multidisciplinary Sciences
Bin Wang, Einstom Engay, Peter R. Stubbe, Saeed Z. Moghaddam, Esben Thormann, Kristoffer Almdal, Aminul Islam, Yi Yang
Summary: In this study, we demonstrate a method for achieving high precision internal mechanical property gradients in 3D printing using tomographic volumetric printing (TVP) technology. By utilizing visible and UV light sources in conjunction with specific chemical reactions, we achieve full 3D stiffness control. Additionally, we identify the role of reactive transport of radical inhibitors in shaping the workpiece and limiting the achievable stiffness contrast range.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
Huan Jiang, Hannah Ziegler, Zhennan Zhang, Heng Zhang, Louise Le Barbenchon, Sundar Atre, Yanyu Chen
Summary: Coronary artery disease (CAD) is a common condition where the coronary arteries become narrow or blocked due to atherosclerosis. This study proposes a new type of tubular lattice metamaterial that shows improved mechanical resilience and bending performance, making it a promising alternative for stent design. The findings demonstrate the potential of this material for developing more robust stents in medical engineering.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Reza Hedayati, Nima Roudbarian, Sara Tahmasiyan, Mahdi Bodaghi
Summary: Origami structures, as a traditional Japanese art, have been applied in engineering field as metamaterials due to their capability of transforming 2D structures into complex 3D structures. Gradient Miura-ori origami metamaterials are introduced as a method to preprogram out-of-plane curvatures, and various unit cell distributions in the origami lattice structure are considered. The results show that these distributions can create different curvatures and achieve all Gaussian curvatures using the proposed models. The approach provides a way to tailor complex preprogrammed surface geometries using linearly varying gradient distributions of Miura-ori origami.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Bahman Taherkhani, Mahdi Bodaghi, Sahar Rahmani, Foad Mesgari
Summary: This study presents a novel strategy to create low-cost and sustainable piezoresistive auxetic sensors using active carbon from consumed AAA batteries, contributing to a circular economy. The sensors are made with an auxetic structure that has a fixed Poisson's ratio during strain and utilizes silicone RTV2 as a substrate and microscale active carbon particles as the sensing element. The sensors achieve a sensitivity improvement of approximately 1000% and 410% compared to previous mixed and layered composite auxetic counterparts. The linear sensitivity of the proposed sensors during strain, estimated with a slope of 0.64, distinguishes them from previous sensors with nonlinear performances. These sustainable sensors are successfully implemented in detecting various human body movements, such as those in the wrist, finger, elbow, and forearm.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ramin Hamzehei, Mahdi Bodaghi, Julio Andres Iglesias Martinez, Qingxiang Ji, Gwenn Ulliac, Muamer Kadic, Changguo Wang, Ali Zolfagharian, Nan Wu
Summary: This article proposes a novel bioinspired friction-based mechanical metamaterial, inspired by parrot's beaks, that exhibits a zero Poisson's ratio behavior. The mechanical performances of the metamaterials are studied at both macro and micro scales through experiments and finite element analysis, demonstrating their energy absorption and dissipation features.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Physics, Multidisciplinary
Soroush Sepehri, Mahdi Bodaghi
Summary: This paper investigates the influence of Coulomb damping on the wave propagation behavior of cubically nonlinear monoatomic phononic chains. The nonlinear dispersion relation is obtained analytically using the multiple scales method and the band structure of the damped nonlinear chains is compared to the linear and nonlinear undamped chains. Coulomb damping can lead to lower dispersion frequencies in the chain due to the coupling between the amplitude and the frequency, resulting from the nonlinear nature of the chain. This study captures the effect of Coulomb damping on the wave propagation behavior of nonlinear lattices, bringing us closer to developing a comprehensive analytical model for the behavior of damped phononic crystals.
Review
Materials Science, Multidisciplinary
Lubna Zeenat, Ali Zolfagharian, Yeleswarapu Sriya, Shyama Sasikumar, Mahdi Bodaghi, Falguni Pati
Summary: The hierarchical network of blood vessels is essential for tissue survival and proper functioning of the body, but damage to the complex vascular system can lead to cardiovascular, musculoskeletal, and neurovascular diseases. Vascular tissue engineering (VTE) aims to develop constructs that integrate with the host vasculature. 4D bioprinting, an emerging technique, shows promise in creating vascular constructs using different materials that respond to stimuli.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Moslem Mohammadi, Abbas Z. Kouzani, Mahdi Bodaghi, Yong Xiang, Ali Zolfagharian
Summary: Currently, additive manufacturing is used to fabricate various actuators for soft robots. An effective controller is required to take advantage of soft robots in terms of power consumption, production costs, weight, and safety when operating near living systems. This study develops an artificial muscle using soft silicone elastomer material that can demonstrate multiple levels of stiffness. A reinforcement learning algorithm-based nonlinear controller is designed to autonomously control the variable stiffness joint. The controller shows a slight increase in settling time but reduces fluctuation amplitude by 33% and power consumption by 41%, compared to the optimized proportional integral derivative controller. It is also adaptable and reliable in new conditions, and the variable stiffness muscle can attenuate vibrations autonomously when increased.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Composites
Ali Shahrjerdi, Mojtaba Karamimoghadam, Mahdi Bodaghi
Summary: This study investigates the optimization of 3D printing using 1.75 mm poly-lactic acid (PLA) filaments. The experiments were conducted using the Fused Deposition Modeling (FDM) method with variable parameters including Infill Percentage (IP), Extruder Temperature (ET), and Layer Thickness (LT). A total of 20 experiments were designed and the optimization model was conducted using the Response Surface Method (RSM). The results showed that increasing the IP and setting the ET at 220°C led to an increase in failure load, with a maximum of 1218 N achieved.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Materials Science, Textiles
Ghazal Ghamkhar, Mehrdad Arianpour, Mahdi Bodaghi
Summary: In this paper, the capillary rise method is used to evaluate the wicking property of tubular braided structures. The effects of structural parameters such as braid angle, interlacement pattern, structural axis, and yarn position are investigated. The results show that the braid angle has the greatest effect on wicking height, and the presence of core yarns increases wicking height. It is better to use biaxial braided structures with a regular pattern for the production of braided sutures.
FIBERS AND POLYMERS
(2023)
Article
Engineering, Mechanical
Victor Okenyi, Mahdi Bodaghi, Petros Siegkas, Neil Mansfield, Shukri Afazov
Summary: This research analyzes a 15 MW OWT support structure using analytical and numerical models, and finds that corrosion increases stress levels and changes the location of maximum tensile stress. Predicting stress evolution due to corrosion is important for future OWT designs and fatigue assessments.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sabarinathan Palaniyappan, Narain Kumar Sivakumar, Mahdi Bodaghi, Madhan Kumar, Mostafizur Rahaman
Summary: This study compares different joining techniques for dissimilar three-dimensional printed thermoplastics and determines that ultrasonic welding provides higher shear strength compared to direct three-dimensional printing. The macroscopic investigation of the ultrasonic welded joint shows good melting of polymers and wetting in the interface, resulting in inter-molecular diffusion and entanglement of polymers.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Editorial Material
Instruments & Instrumentation
Mahdi Bodaghi, Suong Van Hoa, Thomas Gries, Antoine Le Duigou, Yonas Tadesse, Lining Yao, Ali Zolfagharian
SMART MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Amirhossein Enayati Gerdroodbar, Hura Alihemmati, Mohsen Zeighami, Mahdi Bodaghi, Abbas Z. Kouzani, Behzad Pourabbas, Ali Zolfagharian
Summary: In this study, 3D printable composites based on coated glass beads (CGBs) have been prepared by coating the beads with ultraviolet (UV) curable resins and mixing them with 3D printing resin for digital light processing (DLP) printing. The coating process was checked using scanning electron microscopy (SEM), and the mechanical properties of the 3D-printed composite structures were evaluated through bending and compression tests. The success of 3D printing the CGBs into a photopolymer resin (PR) composite with behavior modification and compatibility of the interface with the matrix was demonstrated.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Materials Science, Composites
Mohammad Rezayat, Mojtaba Karamimoghadam, Omid Ashkani, Mahdi Bodaghi
Summary: This study focuses on the synthesis and characterization of a copper-alumina nanocomposite powder. Mechanical milling is used to synthesize the powder and an overall analysis is conducted to evaluate its morphological and structural properties. The study demonstrates the efficacy of mechanical milling for producing nanocomposite powders with enhanced mechanical properties. Additionally, statistical analysis is utilized to determine the significance of different factors influencing the synthesis process.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Computer Science, Interdisciplinary Applications
Fatemeh Ahadi, Mojtaba Biglari, Mohammad Azadi, Mahdi Bodaghi
Summary: This study introduces and compares computational fluid dynamics of Newtonian and non-Newtonian blood flows in coronary arteries, with and without considering stents. The research investigates the differences between the models built with Newtonian and non-Newtonian fluid assumptions and examines the effect of stents on blood flow parameters. The results show that the non-Newtonian model has higher wall shear stress and the presence of a stent leads to higher velocity and wall shear stress.
ENGINEERING REPORTS
(2023)
Article
Mechanics
Ramin Hamzehei, Mahdi Bodaghi, Nan Wu
Summary: This paper investigates the potential of curvy mechanical metamaterials to enhance fracture toughness through topological design. By introducing local curvy ligaments and using 3D printing, a new lattice metamaterial with multi-stiffness unit cells and multi-step fracture control is created. The results demonstrate improved fracture behavior and energy absorption capacity.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
