Article
Mechanics
B. X. Gao, D. K. Zou, Y. C. Guo, H. Xiao
Summary: In this study, a finite element model for the tension and bending of steel/aluminum/steel and aluminum/steel/ aluminum three-layer symmetrical composite panels was established. The delamination mechanism and influencing factors of the impacted composite interface were explored. The results were verified by tension and bending experiments in the laboratory.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Wei-Tsen Lu, Zhenjia Gao, Hari K. Adluru, Kevin H. Hoos, Waruna P. Seneviratne, David H. Mollenhauer, Endel V. Iarve
Summary: This study applies the regularized eXtended Finite Element Method (XFEM) framework to the discrete modeling of damage evolution and interaction in laminated composites. The crack density limit is increased for a given mesh size. The study also introduces the Residual Strength Tracking methodology and an automatic cycle jump step selection algorithm. The predictions show excellent agreement with experimental data.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Aerospace
Haibing Yu, Tiefeng Chen, Yanjie Qiu
Summary: This paper investigates the stress concentration effect of elliptical ventilation openings on aero engine turbine rotors and proposes a method to define the optimal location and shape to reduce this effect. The reliability and accuracy of the theoretical process are verified using the Finite Element Method, and an engineering application case is described. The study provides sufficient theoretical support for determining the optimal location and shape of elliptical ventilation openings on aero engine rotors with stress concentration effect.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Engineering, Multidisciplinary
Bence Hauck, Andras Szekrenyes
Summary: This study explores several methods for computing the J-integral in laminated composite plate structures with delamination. It introduces two special types of plate finite elements and a numerical algorithm. The study presents compact formulations for calculating the J-integral and applies matrix multiplication to take advantage of plate transition elements. The models and algorithms are applied to case studies and compared with analytical and previously used finite element solutions.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Construction & Building Technology
Jun-Seop Lee, Jong-Hun Woo, Kyung-Jae Shin, Hee-Du Lee
Summary: A novel U-shaped composite beam using angle-type shear connectors instead of stud-type connectors was designed in this study, showing improved strength and stability. Load tests revealed good structural performance of this design with some influence from the shear connector spacing. Additionally, Finite Element Analysis was used to evaluate the strength of the angle-type shear connectors and a strength evaluation method for composite beams of this configuration was proposed.
Article
Mechanics
Chaeyoung Hong, Sooyoung Lee, Wooseok Ji
Summary: This study reveals the mechanism of determining the strength of a +/- 45 laminate under tensile loading through experiments and numerical simulation. The experiment observation discovers the unique failure process, including the formation of initial cracks, delamination failure, and the failure of intact layers. The numerical simulation accurately reproduces the experimentally observed failure process.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Composites
Zhong Luo, Bing Yu, Chengshuang Zhang, Xiaoxia Zhang, Xinyu Sun
Summary: In this paper, the influence of delamination damage on the dynamic properties of thin-walled CFRP tubes is investigated through finite element simulation and experimental methods. It is found that both the delamination size and location have an impact on the natural frequency, and positional information can be discerned in the modal shape for delamination detection and localization.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Stanislav Zak, Alice Lassnig, Megan J. Cordill, Reinhard Pippan
Summary: In recent years, research on adhesion properties of thin films on brittle substrates has increased, with the continued use of the Hutchinson-Suo method for measuring adhesion. Modern material combinations may lead to plastic deformations rather than elastic behavior. This study uses finite element analysis to investigate the influence of plastic deformation on experimental procedures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Coatings & Films
F-Z Abbes, C. Coupeau, J. Durinck, M. Talea, Y. Ni, G. Parry
Summary: This study investigates the post-buckling equilibrium shapes that develop on parallel delaminated stripes of films under biaxial compressive stress, with a focus on the effect of substrate elasticity on the expected buckled morphologies. Finite element methods are used to simulate various equilibrium configurations, resulting in a morphological map showing that the stability domains of elementary buckles shift to lower stresses as substrate stiffness decreases and the stability domain of telephone cord buckles is enlarged. An intermediate domain between bubbles and straight-sided/telephone cord buckles is identified, characterized by hook-like or bone-like structures.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Yueqiao Jia, Jeffrey C. L. Chiang
Summary: Shear reinforcement is a common method to strengthen slab-column connections. This study investigates the reduction effect of shear reinforcement on bending moment in unbalanced conditions. Through nonlinear finite element analysis, the study explores the effects of shear reinforcement quantity, diameter, and loading methods on the slab. A corrected moment transfer coefficient formula is proposed for more accurate calculations.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Mengqi Xu, Ke Ma, Quan Zhong
Summary: With the increasing demand for reliable power electronic systems, diagnosing degradation in power modules has become crucial. Existing approaches are limited to identifying specific types of degradation. This article proposes a novel method based on frequency-domain heat flow spectrum analysis to distinguish different degradation modes. Simulations and experiments validate the effectiveness of the proposed analysis and method.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Chemistry, Analytical
Peng Li, Zhiyong Chang
Summary: The study establishes a new cutting force coefficient model and investigates the influence of cutting-edge radius on the shear angle, cutting force components, and stress concentration range during the cutting process. The results provide a theoretical reference for predicting residual stress in parts.
Article
Construction & Building Technology
Pengfei Men, Xuhong Zhou, Jiating Ye, Jin Di, Fengjiang Qin
Summary: This study investigates the ultimate shear strength of slender composite girders in hogging moment regions through experimental and numerical investigation. The influences of various factors on the shear strength of the girders were analyzed. The results indicate that the shear strength is related to the thickness, reinforcement ratio, and width of the concrete slab, with the slab thickness having the greatest effect.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2022)
Article
Engineering, Mechanical
Ziang Peng, Yuefeng Jiang, Yuzhen Chen, Yongzhong Huo
Summary: In this article, the authors numerically study the stress concentration behavior of liquid crystal elastomers (LCEs) with different initial director orientations. They find that the stress concentration factor decreases as the initial director orientation deviates from the loading direction, with the minimum achieved at a deviation angle of 45 degrees. The reduction in stress concentration is attributed to smaller relative net director rotation and lower resulting spontaneous strain near the hole edge.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Yu Dudarkov, M. Limonin
Summary: An engineering method is proposed to calculate transversal shear stresses in a layered composite stack by transitioning to an equivalent homogeneous beam model based on the Zhuravsky formula. The technique successfully estimates shear stresses in layered composite stacks while considering the significant effect of monolayer stacking on stress distribution and value. The method's applicability limits are explored, showing its effectiveness in estimating shear stresses in layered composites.
INORGANIC MATERIALS
(2021)
Article
Chemistry, Physical
Lili Wang, Weidong Chen, Chengshan Li, Guo Yan, Yong Feng, Pingxiang Zhang, Yong Zhang, Yong Zhao
Summary: The sparking plasma sintering (SPS) technique can effectively improve the grain connection and refinement of MgB2, enhancing its superconductivity performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Xiaobao Shi, Qingyun Mao, Bo Zhang, Jun Jiang, Linjie Li, Lifeng Zhao, Yong Zhang, Yong Zhao
Summary: This study investigates the effects of temperature on the dynamic characteristics of a high-T-c superconductor and permanent magnet system. The resonant frequency of the system decreases with increasing field cooled gap or mass at different temperatures. Decreasing temperature enhances the stiffness of the interaction force between the superconductor and the permanent magnet. However, this effect is more significant at a smaller field cooled gap, indicating that the enhancement of stiffness and resonant frequency by lowering temperature also depends on the magnetic field gradient.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Physics, Applied
Yong Zhao, Dongyang Lin, Feinan Cai, Changwei Ji, Lifeng Zhao, Dajin Zhou, Cuihua Cheng, Yong Zhang
Summary: The stability and dynamic behavior of the magnetic levitation system are influenced by the amplitude of magnetic field fluctuations, leading to oscillation behavior that varies linearly with the magnetic fluctuation amplitude. The dynamical behavior is governed by two driving forces of different characteristic frequencies, which may result in periodical motion towards period-doubling bifurcation and eventually evolving into a chaotic state under certain conditions.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Physics, Multidisciplinary
Yong Zhang, Zhong-Ming Yan, Tian-Hao Han, Shuang-Shuang Zhu, Yu Wang, Hong-Cheng Zhou
Summary: This paper proposes an acoustically actuated piezoelectric antenna for the low frequency (LF) band. The antenna is theoretically calculated, numerically optimized, and experimentally analyzed. The results show that the piezoelectric antenna has a higher radiation efficiency and transmission distance compared to electrically small antennas (ESA) of the same size. Additionally, the gain, directivity, and quality factor of the antenna are also analyzed. The research conclusions provide a reliable theoretical basis for miniaturizing LF antennas.
Article
Engineering, Electrical & Electronic
Kuan Ren, Kejia Zhang, Xizi Qin, Feng Yang, Bai Sun, Yong Zhao, Yong Zhang
Summary: This paper proposes a new voltage threshold adaptive memcapacitive-coupled memristor (VTEAM-M) model, which accurately describes the behavior of resistance-capacitance coupling changes and multiple memristive states in voltage-controlled memristors. The innovation of this model lies in the use of multiple state variables to represent the superposition and transition between different states, resulting in simulation results that are in good agreement with the variation of resistance and capacitance in real devices.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Chemistry, Physical
Guowei Li, Junsong Luo, Xuan Yu, Mingming Ran, Pengshuai Qu, Lian Liu, Zhou Yu, Yong Zhao, Yong Zhang
Summary: In this study, 2.5% Cu-doped Nb3Al wire was prepared using the Rapid-Heating Quenching and Transformation (RHQT) method with optimized annealing. The structure and properties of the samples were investigated by XRD and FESEM, and it was found that prolonged annealing led to the decomposition of the metastable A15 phase and the formation of sigma phase, which accumulated Cu. Magnetic measurements showed that the superconducting properties of the samples were significantly improved under the optimized annealing conditions.
Article
Materials Science, Multidisciplinary
Yutong Liu, Jiajia Qin, Chuan Ke, Cuihua Cheng, Dajin Zhou, Yong Zhang, Yong Zhao
Summary: Unlike non-magnetic pinning centers, magnetic pinning centers, which have stronger flux pinning force due to direct magnetic interaction with magnetic vortices, are widely used to enhance the critical current density of various superconductors. In this study, nanoparticles of antiferromagnet CrB2 were introduced as magnetic pinning centers to improve the flux pinning force, irreversible field, and critical current density of MgB2. The results showed a significant improvement in these properties, especially in the high field region.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Genhua Huang, Changkun Yang, Xiaguang Sun, Pingyuan Li, Jianwei Liu, Zhou Yu, He Lin, Yong Zhang, Yong Feng, Yong Zhao
Summary: This paper investigates the pinning behavior of high-performance Nb3Al samples and finds that the scaling behavior of pinning force is dominated by the planar pinning mechanism. The variation of scaling exponents p and q with sample's performance suggests that the main source of planar pinning centers in high-performance Nb3Al may not be grain boundaries, but other planar defects.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Physics, Applied
Xiaofeng Chen, Suhua Yang, Yongliang Chen, Lili Wang, Yong Zhang, Yong Feng, Yong Zhao
Summary: Nb3Al superconductors were successfully prepared by spark plasma sintering (SPS) technology, and compared with the traditional powder metallurgy (PM) method. The results showed that the local high temperature generated in the SPS process accelerated the formation of Nb3Al phase, and the short reaction time and fast cooling resulted in smaller and tightly connected Nb3Al grains, which improved the superconducting properties.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Engineering, Mechanical
Feinan Cai, Dajin Zhou, Jianjun Wei, Ju Wang, Cuihua Cheng, Yong Zhang, Yong Zhao
Summary: This study investigated the magnetic resistance of the high-temperature superconducting maglev train during operation, establishing the correlation between magnetic resistance, running speed, and magnetic field gradient. The results showed that both magnetic resistance and its rate of change increase with the increase of the magnetic field gradient.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaoying Chen, Tingting Li, Fangquan Li, Xuan Tang, Lian Liu, Yongliang Chen, Xiaguang Sun, Jianwei Liu, Guo Yan, Yong Feng, Yong Zhang, Yong Zhao, Zhou Yu
Summary: This study compares the microstructure and composition of Ti- and Ta-doped Nb3Al superconductors fabricated using a rapid heating, quenching, and transformation process. The results show that the 3 at% Ti- and Ta-doped samples exhibit superior superconducting properties compared to the 10 at% doped samples. The Ti-doped sample has a constant Nb content of 67 at% while the Ta-doped sample has an Al + Ta content of 25 at%.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Automation & Control Systems
Yunfei Wan, Silu Chen, Liming Yuan, Chi Zhang, Yong Zhang, Guilin Yang
Summary: This article introduces a novel dual-drive checkerboard gantry design with symmetric layout, rigid structure, and decoupled X-Y motion. The challenges posed by the double redundantly actuated configuration and interaxis coupling force are addressed through the establishment of a dynamical model and the proposed control scheme. Real-time experiments on the actual testbed demonstrate the successful improvement in planar motion precision and prevention of parameter drifting over a large workspace.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Materials Science, Multidisciplinary
Mingming Ran, Pengshuai Qu, Guangbin Liu, Lian Liu, Yongliang Chen, Xiaguang Sun, Jianwei Liu, Guo Yan, Yong Feng, Yong Zhang, Yong Zhao, Zhou Yu
Summary: This paper systematically studied the microstructure and phase formation sequence in PIT Nb3Al processed by RHQ, and found that the phase and microstructure are mainly determined by the RHQ condition and local Nb/Al distribution.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Electrical & Electronic
Yong Zhang, Zhongming Yan, Biao Dong, Yu Wang, Hongcheng Zhou
Summary: This paper presents a novel method to improve the working bandwidth and radiation intensity of a piezoelectric antenna by using an external circuit. The experimental results show that adding series capacitance and inductance can increase the tuning range of the resonant frequency and produce new resonance frequencies. The LLC composite circuit can increase the number of resonant frequencies and enhance the radiated magnetic field of the piezoelectric antenna.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Wuyifan Zhou, Feng Yang, Ling Yuan, Yangmin Diao, Ou Jiang, Yuan Pu, Yong Zhang, Yong Zhao, Dan Wang
Summary: A multi-functional superhydrophobic coating with excellent water repellency, corrosion protection, and antibacterial properties has been developed in this study, which is suitable for applications in medical devices and chemical equipment.