Article
Materials Science, Multidisciplinary
Yuxing Yang, Yongjie Bao, Jinlong Wang, Fengming Du
Summary: A multi-bolt spring-mass method was developed to predict the shear stiffness and bolt stiffness of single-lap composite joints. The method converts multi-bolt joints into individual single-bolt joints, considering stress envelope, gradual elimination of bolt-hole clearances, and irregular assembly gap shape. Validation showed relative errors of less than 3% for shear stiffness and less than 20% for bolt stiffness in typical three-bolt composite joints.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Manufacturing
Yuxing Yang, Yuxin Ma, Zhen Liu, Yongjie Bao, Jinlong Wang, Chen Chen
Summary: The position and amount of shimming have a significant influence on the weight and mechanical performance of thin-walled products with assembly gap in aerospace components assembly. A developed analytical method was used to predict the assembly-induced deformation of bolted composite joints with assembly gap. The method determines the bending deformation and bolt head compression deformation by evaluating the elimination of assembly gap and the position within the conical and spherical envelope of the fastener. The method was validated with a relative error less than 10% in a preloading experiment of three-bolt composite joints and applied to analyze the assembly-induced deformation of a composite box structure.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Biophysics
Thiago Ribeiro Teles Santos, Priscila Albuquerque Araujo, Liria Akie Okai-Nobrega, Rodrigo de Sousa Gomide, Vanessa Lara Araujo, Fabricio Saucedo, Marcus Fraga Vieira, Sergio Teixeira Fonseca
Summary: Older runners (OR) adopt a stiffer running pattern characterized by distinct inter-joint lower limb coordination at the early stance phase during self-selected and fixed speeds, as shown in this study. OR demonstrate greater vertical stiffness (Kvert) compared to younger runners (YR) at both speeds. The hip-ankle coupling angle (CA) pattern differs between groups, with OR showing in-phase, distal dominancy and YR showing anti-phase, proximal dominancy, while the knee-ankle CA difference is only significant at self-selected speed.
JOURNAL OF BIOMECHANICS
(2023)
Article
Engineering, Civil
Xiushu Qu, Jiahao Yan, Qingwen Liu, Yuxiang Deng
Summary: Currently, research on the joint between concrete-filled steel tubular (CFST) columns and H-shaped steel beams mainly focuses on traditional cast-in-place construction methods, lacking studies on prefabricated assembly connections. This study proposes a fully assembled joint for prefabricated CFST column-H-shaped steel beam connection, and investigates its seismic performance through experiments and simulations. The results show that the thickness of the end plate greatly impacts the failure mode and bearing capacity of the joint, while energy dissipation capacity and plastic deformation capacity are less affected. Simulation indicates that an appropriate thickness of the steel tubular column can improve the mechanical performance of the joint's core area, but excessive local deformation of the end plate decreases energy dissipation capacity. Thin end plate thickness leads to excessive deformation at the flange and underutilization of the core area column, resulting in a significant decrease in bearing capacity and stiffness of the joint.
Article
Neurosciences
C. T. Barnett, A. R. De Asha, T. K. Skervin, J. G. Buckley, R. J. Foster
Summary: This study investigates how varying the stiffness of running specific prostheses (RSP) affects limb stiffness, running performance, and joint kinetics in individuals with unilateral transtibial amputation. The results show that increasing RSP stiffness increases prosthetic limb stiffness and slightly decreases intact limb stiffness. Intact limb forward velocity during stance-phase and contact time are higher, while prosthetic limb values are lower, but these are not affected by RSP stiffness. Intact limb hip joint positive work increases for both higher and lower stiffness conditions, while prosthetic limb work remains unchanged. The results indicate an acute mechanical demand on the intact limb in response to changes in RSP stiffness, but overall running speed is unaffected.
Article
Automation & Control Systems
Zhihao Li, Wei Tian, Junshan Hu, Min Wang, Bo Li, Wenhe Liao
Summary: This study examines the precision loss problem caused by the layout pattern of flexible track drilling robots and proposes an equivalent stiffness model to predict the incremental error of the entire process station. An optimization algorithm for global position accuracy compensation is also proposed. Experimental results showed that the method optimized 68.67% of the total error.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yingzhi Sun, Xinghuan Wang, Menglin Xiao, Shanshan Lv, Mengjiao Cheng, Feng Shi
Summary: Macroscopic supramolecular assembly (MSA) is a new concept focusing on noncovalent interactions between macroscopic building blocks, mainly limited to hydrogel materials. By adjusting intrinsic properties of nonhydrogel materials, MSA can be realized, demonstrating the feasibility of directly adjusting the modulus of bulk materials to achieve MSA, potentially providing new solutions for elastomer materials manufacture.
Article
Engineering, Mechanical
Nhi H. Vo, Thong M. Pham, Hong Hao, Kaiming Bi, Wensu Chen
Summary: Metaconcrete and meta-truss bar are innovative materials and structures that possess unique characteristics for structural protection. This paper investigates the formation of bandgaps in these structures and provides analysis and design procedures for predicting bandgaps in metamaterials and metastructures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Jiulin Wu, Lizhan Zeng, Bin Han, Yifan Zhou, Xin Luo, Xiaoqing Li, Xuedong Chen, Wei Jiang
Summary: By proposing a novel compact arrayed-magnetic-spring with negative stiffness (AMS-NS), this paper makes innovative progress in paralleling magnetic negative stiffness with positive stiffness, demonstrating the effective reduction of resonance frequency with AMS-NS. Parametric studies and dynamic experiments further confirm the high negative stiffness density and good isolation performance of AMS-NS.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Shujin Yuan, Yi Sun, Min Wang, Jiheng Ding, Jinglei Zhao, Yining Huang, Yan Peng, Shaorong Xie, Jun Luo, Huayan Pu, Fuqiang Liu, Long Bai, Xiao-Dong Yang
Summary: This paper proposes a vibration isolator based on a tunable negative stiffness mechanism, which combines the advantages of high-static low-dynamic stiffness isolators and variable stiffness isolators. The use of a novel tunable negative stiffness spring using Maxwell normal stress results in significantly improved stiffness tunable range and energy utilization efficiency due to the newly designed magnetic circuit. Experimental results demonstrate that the device can produce online tunable negative stiffness, expanding the isolation bandwidth and significantly improving vibration isolation performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Raju Ahamed, Ian Howard, Kristoffer McKee
Summary: This paper investigates the dynamics of a single-degree-of-freedom magnetic spring-based oscillator system. The system consists of a nonmagnetic shaft, a floating permanent magnet, and two fixed permanent magnets that repel each other. The magnetic properties and restoring force of the system are studied, and the analytical investigation is validated through experimental and numerical analyses. The linear and nonlinear coefficients are analyzed based on the magnetic restoring force, and the effects of gravitational force on the equilibrium position are examined. The system dynamics, including damping ratio, eigenvalues, and natural frequencies, are investigated with and without electromechanical coupling. The energy generation capacity of the system is also examined using electromechanical coupling.
NONLINEAR DYNAMICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Tim Sirola, Il Yong Kim
Summary: Topology optimization (TO) has been widely used in industry for structurally efficient designs. Multi-material TO (MMTO) allows for considering multiple candidate materials, but is limited by the assumption of perfect joining between dissimilar materials. On the other hand, Multi-joint topology optimization (MJTO) incorporates dissimilar material joining directly within the optimization loop and reduces manual interpretation. This work extends MJTO to include mass minimization under stiffness constraints and introduces a new joint material modeling approach.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Acoustics
Fanglan Peng, Qichen Wu, Wuhui Pan, Yisheng Zheng, Shilin Xie, Yahong Zhang, Yajun Luo
Summary: This paper proposes a locally resonant metastructure beam that can effectively suppress low/ultra-low-frequency structural vibrations. By using high-static-low-dynamic stiffness resonators and magnetic negative stiffness springs, the metastructure beam achieves vibration suppression in the low-frequency region (f < 10 Hz).
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Mechanical
G. Gatti, C. Svelto
Summary: This paper proposes a paradigm shift in designing nonlinear oscillators by exploiting nonlinearity to achieve linear behavior for engineering purposes. The study focuses on an elastic suspension system with four inclined springs, which has a strong geometric nonlinear stiffness characteristic. By wisely selecting design parameters, a tailored force-displacement characteristic can be attained, with a particular relationship among these parameters resulting in an overall linear behavior. The proposed configuration provides more freedom in device dimensioning compared to classical linear springs, and the potential advantage of linear elastic behavior with geometric nonlinear damping.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Civil
D. K. Nayak, P. R. Dash
Summary: This paper examines the impact of a spring attachment provided on the top elastic layer on the stability of a pre-twisted, rotating sandwich beam with viscoelastic supports at the root under the influence of a periodically varying axial load. Through mathematical modeling and analysis, it investigates the effects of factors such as the position, mass, and stiffness of the spring attachment on the system's stability.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Chemistry, Multidisciplinary
Gengheng Zhou, Yi-Qi Wang, Joon-Hyung Byun, Jin-Woo Yi, Sang-Su Yoon, Hwa-Jin Cha, Jea-Uk Lee, Youngseok Oh, Byung-Mun Jung, Ho-Jun Moon, Tsu-Wei Chou
Article
Materials Science, Composites
Gengheng Zhou, Joon-Hyung Byun, Yi-Qi Wang, Hwa-Jin Cha, Jea-Uk Lee, Byung-Mun Jung, Jung-Il Song, Byung-Sun Kim, Tsu-Wei Chou
COMPOSITES SCIENCE AND TECHNOLOGY
(2015)
Article
Polymer Science
Xueshu Liu, Yuxing Yang, Yiqi Wang, Yongjie Bao, Hang Gao
INTERNATIONAL JOURNAL OF POLYMER SCIENCE
(2017)
Article
Engineering, Chemical
Abdul Wasy Zia, Yi-Qi Wang, Seunghun Lee
ADVANCES IN POLYMER TECHNOLOGY
(2015)
Article
Chemistry, Applied
P. Sudhakara, Dani Jagadeesh, YiQi Wang, C. Venkata Prasad, A. P. Kamala Devi, G. Balakrishnan, B. S. Kim, J. I. Song
CARBOHYDRATE POLYMERS
(2013)
Article
Materials Science, Multidisciplinary
Yi-qi Wang, Jae-gyu Kim, Jung-il Song
MATERIALS & DESIGN
(2014)
Article
Metallurgy & Metallurgical Engineering
Atta Ur Rehman Shah, Dong-woo Lee, Yi-qi Wang, Abdul Wasy, K. C. Ham, Krishnan Jayaraman, Byung-Sun Kim, Jung-Il Song
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2014)
Article
Metallurgy & Metallurgical Engineering
Bao Yong-jie, Wang Yi-qi, Gao Hang, Liu Xue-shu, Zhang Yi-ni
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2019)
Article
Materials Science, Multidisciplinary
Ping Cheng, Yong Peng, Kui Wang, Yi-Qi Wang, Chao Chen
Summary: The experimental investigation focused on the intralaminar crack propagation of the carbon/epoxy two-dimensional plain woven composite material. Findings showed that the crack propagation direction is aligned along the intersecting position of warp and weft fibers. The process involves two major stages and was further verified by analysis of optical and scanning electron microscope images.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Biochemistry & Molecular Biology
Zeman Liu, Yiqi Wang, Fei Guo
Summary: This study fabricated fibrous membranes using the electrospinning technique and investigated the effects of fiber arrangement, fiber diameter, and fiber deformations on hydraulic permeability. The results showed that hydraulic flow affects the porosity and pore structure of the fibrous membranes.
Article
Polymer Science
Lun Li, Yiqi Wang, Jialiang Qi, Shenglei Xiao, Hang Gao
Summary: A novel high recognition rate inspection method for carbon fiber plain-woven prepregs is proposed, which compresses image texture features and defines defect types through K-means clustering, achieving a competitive overall recognition rate of 0.944.
Article
Polymer Science
Jialiang Qi, Lun Li, Yiqi Wang, Hang Gao
Summary: A study proposes an equivalent continuum mechanics model considering the temperature-force behavior of carbon fiber plain-woven thermoset prepreg, and validates the accuracy of the model through experiments. Results show that the predicted model has high accuracy and is consistent with the fold position and deformation trend observed in the experiments.
Article
Computer Science, Information Systems
Xingqun Xue, Yanjiao Zhang, Lixia Zhang, Yiqi Wang, Ruochen Hou
Summary: This study analyzes the impact of intelligent technologies on the sustainable development of urban rail transit and establishes an application system to promote the sustainable development of the intelligent urban rail transit industry. Through the application of fuzzy-DEMATEL and ISM methods, the study concludes the hierarchical structure model of intelligent rail transit sustainable development and applies it to the collaboration among government, enterprises, and users.
MOBILE INFORMATION SYSTEMS
(2022)
Article
Materials Science, Composites
Yuxing Yang, Xueshu Liu, Yi-Qi Wang, Hang Gao, Rupeng Li, Yongjie Bao
COMPOSITES SCIENCE AND TECHNOLOGY
(2017)
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)