Article
Nuclear Science & Technology
M. Agredano-Torres, J. L. Garcia-Sanchez, A. Mancini, S. J. Doyle, M. Garcia-Munoz, J. Ayllon-Guerola, M. Barragan-Villarejo, E. Viezzer, J. Segado-Fernandez, D. Lopez-Aires, J. Toledo-Garrido, P. F. Buxton, K. J. Chung, J. Garcia-Dominguez, L. Garcia-Franquelo, M. P. Gryaznevich, J. Hidalgo-Salaverri, Y. S. Hwang, J. I. Leon-Galvan, J. Maza-Ortega
Summary: This paper presents the coil and power supply design of a new spherical tokamak, the SMall Aspect Ratio Tokamak (SMART), being designed at the University of Seville. The design includes a central solenoid, toroidal field coils, and poloidal field coils, with each coil designed to withstand Joule heating during tokamak operation. Additionally, the flexible and modular power supply design based on IGBTs and supercapacitors is explained, along with the topologies and control strategy of the power supplies.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Engineering, Electrical & Electronic
Jun Tu, Zhiwu Zhong, Xiaochun Song, Xu Zhang, Zhiyang Deng, Mengran Liu
Summary: A ring array EMAT system was proposed to effectively expand the detection range of a single EMAT, and experimental validation shows that it has better inspection ability and accuracy compared to traditional piezoelectric ultrasonic transducers.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Biochemical Research Methods
Chukun Gao, Pin-Hui Chen, Alexander Dapp, Michael A. Urban, Ronny Gunzenhauser, Nicholas Alaniva, Alexander B. Barnes
Summary: Spherical rotors in magic angle spinning (MAS) nuclear magnetic resonance (NMR) experiments have the potential to provide advantages such as ease of fabrication, low risk of rotor crash, easy sample exchange, and better microwave access. However, the poor NMR filling factor has been a major disadvantage of spherical rotors so far. This study presents a novel NMR coil geometry in the form of a spherical coil, which maximizes sensitivity by best fitting the spherical sample and provides excellent RF homogeneity. The use of a spherical shell as the rotor further improves NMR sensitivity by maximizing sample volume, and a 3D-printed ring stator external to the coil simplifies MAS stators. The results show that the spherical solenoid coils generate comparable B1 field intensities but have better homogeneity than cylindrical solenoid coils do.
JOURNAL OF MAGNETIC RESONANCE
(2022)
Article
Physics, Fluids & Plasmas
Yu Zhou, Yiyun Huang, Zongqiu Gao, Fei Guo, Jian Zhang
Summary: Fishtail divertor (FTD) is an important research object of the Experimental Advanced Superconducting Tokamak (EAST) tokamak divertor system. A combination of inductance and capacitance (LC) series resonance theory and high-frequency pulsewidth modulation (PWM) technology is proposed to meet the requirements. A sine wave power supply with multiple frequency points and high current is developed. The FTD power supply adopts dc switching power technology, sinusoidal PWM technology, and LC series resonance theory. The test results demonstrate that the FTD PS meets the system requirements.
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2022)
Article
Nuclear Science & Technology
F. Schoofs, T. N. Todd
Summary: We present a workflow that approximates the key machine parameters of a spherical tokamak fusion power plant based on the specified maximum field strength, aspect ratio, and distance between the toroidal field coil and plasma edge, along with a limited set of plasma physics parameters. This workflow enables the identification of a parameter space where compact and commercially viable power plants can be designed, considering the exported electrical power and fusion gain.
FUSION ENGINEERING AND DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Menglong Cong, Shanshan Zhang, Xueyan Chen, Kunpeng Zhou
Summary: This paper conducts a simulation study on the electromagnetic performance of solenoid magnets with different structures. The results show that solenoid magnets with trapezoidal cross-section have the largest critical current and most uniform density distribution, reducing safety risks and improving the current carrying capacity of the coil.
FRONTIERS IN MATERIALS
(2022)
Article
Nuclear Science & Technology
P. Zito, M. Manganelli, A. Lampasi, S. Pipolo, R. Lopes
Summary: The DTT facility, under construction in Italy, aims to study and design heat exhaust systems. The Toroidal Field magnet system of DTT consists of 18 superconducting coils powered by a single 24-pulse thyristor-based converter. In case of a quench, the magnetic energy stored in the coils is extracted by 3 Fast Discharge Units. The design phase of TFPS and FDUs, including the use of SiC varistors and a fully electronic high-current switch, is discussed in this paper.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Nuclear Science & Technology
Urmil Thaker, Vaibhav Ranjan, Supriya A. Nair
Summary: The conceptual design of the Small Scale Spherical Tokamak (SSST), including the poloidal field coils, toroidal field coils, and Ohmic Transformer (OT) system, has been completed. The OT system, consisting of a Central Solenoid (CS) and compensating coils TR1, TR2 & TR3, is used for ramping up and sustaining the plasma current. The preliminary design for the OT system power supply has been finalized, and a prototype OT power supply has been developed, with the conceptual design, operating philosophy, simulation results, and experimental results presented in this paper.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Computer Science, Information Systems
Zheng Li, Bo Xie, Yiding Zhu, Hexu Sun
Summary: A new tile-shaped receiving coil is designed to improve the power output of the multi-degree-of-freedom spherical motion device, and the formula of its transmission characteristics is derived and verified by finite element simulation. The experimental results show that the output of the new system has been improved overall at each deflection angle.
Article
Engineering, Electrical & Electronic
Dun Lu, Wenjie Fu, Meng Han, Chaoyang Zhang, Shijie Hu, Lin He, Yang Yan
Summary: This article presents the design and preliminary experiment of a room-temperature Bitter magnet for developing compact gyrotrons. A special design is adopted to lengthen the magnetic field homogeneity region without significantly increasing power consumption. Both simulation and experimental measurement show that the length of the homogeneity region is 120 mm, and a homogeneity delta B/B of +/- 0.9% is obtained. Based on the experimental measurement of this Bitter magnet, a 5 kV magnetron injection gun (MIG) is designed with a velocity ratio of 1.3 and transverse velocity spread of 12% at a current of 0.5 A.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nuclear Science & Technology
P. Gao, S. Q. Xue, F. Long, F. Liu, H. J. Liu, Y. Wu, J. G. Li, J. G. Qin, C. Zhou
Summary: The design and preliminary testing of the 15 T hybrid superconducting magnet was successful, demonstrating good performance and magnetic field homogeneity. The innovative design of the Nb3Sn coils allowed for achieving the expected high current and central magnetic field values.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Nuclear Science & Technology
K. Ahmad, Z. Ahmad, M. Bilal, M. Taimoor
Summary: The tokamak is widely accepted among the fusion community for future fusion reactors. Eddy currents are crucial for its steady-state operation and can be mitigated through experimental and simulation tools, optimizing startup scenarios.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Engineering, Electrical & Electronic
Jung Tae Lee, Seong Hyeon Park, Jeonghwan Park, Jaemin Kim, Young-Gyun Kim, Hyun Wook Kim, Hyun Sung Noh, Haigun Lee, Sangjun Oh, Seungyong Hahn
Summary: The study presents a preliminary conceptual design study on using HTS technology for toroidal field coils in tokamaks, discussing the possibility and challenges of HTS fusion magnets. Results show the feasibility of HTS TF coils with current technology, but highlight the need for cost reduction.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Review
Chemistry, Physical
Yuehang Sun, Yun-Ze Li, Man Yuan
Summary: Smart wearables are gaining more attention and lithium-ion batteries are commonly used for energy storage. This paper discusses the trends and challenges of smart wearables, and suggests the need for practical and durable energy harvesting technologies. The research summarizes various energy harvesting techniques such as solar, thermal, RF, kinetic, and biomass energy, and analyzes their application potential and limitations. The combination of energy harvesting systems and micro energy storage enables continuous power supply for wearables in different circumstances, providing guidance for future energy supply methods.
Article
Nuclear Science & Technology
P. P. Khvostenko, I. O. Anashkin, E. N. Bondarchuk, A. N. Chudnovsky, A. A. Kavin, A. P. Khvostenko, N. A. Kirneva, E. G. Kuzmin, I. Levin, V. M. Leonov, A. Lutchenko, A. L. Modyaev, A. Nikolaev, G. E. Notkin, A. N. Romannikov, I. N. Roy, M. M. Sokolov, A. Sushkov
Summary: The preparation for T-15MD tokamak's physical start-up is completed at the National Research Center Kurchatov Institute. The main parameters of T-15MD have been tested and the magnet system's ability to maintain plasma current has been confirmed.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Multidisciplinary Sciences
G. I. Mikhasev, M. G. Botogova, V. A. Eremeyev
Summary: This article studies anti-plane motions of an elastic plate considering surface energy in linear Gurtin-Murdoch surface elasticity. Two boundary-value problems are analyzed to describe shear dynamics in a plate with free faces or with both free and clamped faces. The dispersion relations, especially the influence of the plate thickness to characteristic length ratio, are carefully analyzed.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Thermodynamics
Piotr J. Ziolkowski, Tomasz Ochrymiuk, Victor A. Eremeyev
Summary: This paper examines the nonlinear behavior of a streamlined thin plate in an aerodynamic tunnel. The study uses FSI tools for numerical simulation and emphasizes the nonlinear phenomena occurring during the interaction between the flow and the plate.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Review
Mathematics, Applied
Wolfgang H. Mueller, Elena N. Vilchevskaya, Victor A. Eremeyev
Summary: This paper aims to highlight several issues in electrodynamic field theory and advocate for a rational continuum approach. Starting with the balances for magnetic flux and electric charge, both in general formulations for volumes and open surfaces, the paper explores the spatial perspective in field description and its advantages over the concept of material particles. It also addresses the selection of suitable units for electromagnetic fields and investigates the transformation properties of these fields in space-time notation.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Engineering, Multidisciplinary
Mohammad Malikan, Victor A. Eremeyev
Summary: This study introduces a new approach to address micro-mechanic problems using the modified couple stress theory. The model considers micro-particles' rotations, which are crucial for microstructural materials and small scales. While the framework is suitable for static situations, it is necessary to consider micro-rotations' mass inertias for dynamic investigations. The solution methods are validated using numerical models, highlighting the importance of static and dynamic length scale parameters in studying microstructure vibrations.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Thermodynamics
Florian Massing, Sebastian Glane, Wolfgang H. Mueller, Victor A. Eremeyev
Summary: This paper examines the possibility of using Eringen's Generalized Continuum Theories as a model for human blood flow in microcirculation. The study suggests that a micromorphic fluid, which considers blood as a suspension of deformable particles (red blood cells) in a Newtonian fluid (blood plasma), accurately represents the behavior of blood flow in narrow capillaries. The flexibility of the substructure in the micromorphic fluid model plays a significant role in capturing the shear-thinning behavior observed in human blood. Rating: 8/10
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Thermodynamics
V. A. Eremeyev, Vl. Vas. Balandin, Vl. Vl. Balandin, A. M. Bragov, A. Yu. Konstantinov, L. A. Igumnov
Summary: In this study, tests were conducted on dry clay in a uniaxial stress state using the split Hopkinson pressure bar method. The compressive strength of the clay was determined as an important component of S.S. Grigoryan's soil medium model based on the experimental results. The parameters of this model were determined using the modified Kolsky method with a sample enclosed in a rigid cage. Special experiments were also carried out to verify the soil medium model by studying the penetration of a striker with conical tips into dry clay in a reversed setup. Numerical simulation of clay penetration under similar conditions to the reversed experiments was performed using the identified model in the LS-Dyna software package. The comparison of the results from physical and numerical experiments showed satisfactory agreement at a dry friction coefficient of 0.5.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Multidisciplinary
Gennadi Mikhasev, Baris Erbas, Victor A. Eremeyev
Summary: This paper investigates the anti-plane shear waves in a domain composed of an infinite layer and a thin coating on an elastic half-space. The elastic properties of the coating, layer, and half-space are assumed to be different. Two possible regimes related to exponentially decaying waves in the half-space are found: the first one, called transversely exponential-transversely exponential (TE-TE) regime, is related to waves described by exponential functions in the transverse direction, and the second one, transversely harmonic-transversely exponential (TH-TE) regime, corresponds to waves in the upper layer exhibiting harmonic behavior in the transverse direction. Detailed analysis of the dispersion equations for both regimes is provided, including the effects of surface stresses, layer thickness, and the ratio of shear moduli of the upper layer and half-space on the dispersion curves.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mathematics
V. A. Eremeyev
Summary: This study formulates the conditions for the strong ellipticity of equilibrium equations in strain gradient elasticity under finite deformations. The model considers the strain energy density as a function of the first and second gradients of the position vector. Ellipticity imposes constraints on the tangent elastic moduli and is closely related to infinitesimal stability. The study determines the necessary and sufficient conditions for infinitesimal stability in the first boundary-value problem with Dirichlet boundary conditions for 1D deformation, which are expressed as two inequalities for elastic moduli.
VESTNIK ST PETERSBURG UNIVERSITY-MATHEMATICS
(2023)
Article
Thermodynamics
Anastasiya E. Vilchevskaya, Elena N. Vilchevskaya, Wolfgang H. Mueller, Victor A. Eremeyev
Summary: In this paper, the blood flow through blood vessels of various radii is studied, including the case of variable cross section as well as modeling the blood flow through venae and arteries. Two approaches are proposed to mimic the dependency of blood viscosity on red blood cells aggregation. The efficiency of the proposed constitutive equations for describing blood flow is verified by comparing with experimental data for a narrow capillary, and velocity profiles for blood vessels of variable radius are obtained based on compiled empirical formula.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2023)
Article
Engineering, Mechanical
Marco Zucca, Emanuele Reccia, Nicola Longarini, Victor Eremeyev, Pietro Crespi
Summary: This paper analyzes the structural behavior of an existing reinforced concrete bridge subjected to corrosion effects due to carbonation. An efficient procedure based on the implementation of a Finite Element Model (FEM) with Timoshenko beam elements is used. The safety level of the bridge is evaluated considering different load conditions and a retrofitting intervention is proposed.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Multidisciplinary
Shahriar Dastjerdi, Omer Civalek, Mohammad Malikan, Bekir Akgoz
Summary: This research focuses on analyzing rotating truncated conical baskets reinforced by carbon nanotubes around two independent axes. A time-dependent analysis is used to extract the nonlinear dynamic governing equations for the structure. Carbon nanotubes are used to reinforce the conical basket, with different distributions impacting the mechanical properties. The resistance of a novel two-axis rotating conical basket as a centrifuge device is investigated at various rotational velocities. The results show that reinforcing the basket with carbon nanotubes increases its resistance against deformation caused by rotation.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Engineering, Multidisciplinary
Stepan Konev, Victor A. Eremeyev, Hamid M. Sedighi, Leonid Igumnov, Anatoly Bragov, Aleksandr Konstantinov, Ayaulym Kuanyshova, Ivan Sergeichev
Summary: This article presents the experimental studies on the dynamic deformation and failure of a unidirectional carbon fiber reinforced plastic under compression. The results show that the strain rate significantly affects the strength and deformation characteristics of the material. The obtained results can be used to design structural elements operating under dynamic shock loads and to build models of mechanical behavior and failure criteria, considering the strain rate effects.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Victor A. Eremeyev
Summary: We discuss the ellipticity properties of an enhanced model of poroelastic continua called dilatational strain gradient elasticity. We show that the equilibrium equations are elliptic in the sense of Douglis-Nirenberg, which is more general than ordinary and strong ellipticity. The loss of ellipticity can be considered as a criterion for strain localization or material instability.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Mechanics
Shahriar Dastjerdi, Mohammad Malikan, Bekir Akgoz, Omer Civalek, Victor A. Eremeyev
Summary: The research simulates the motion of the Earth's layers caused by internal pressures using an efficient mathematical model. By considering the Earth's rotation, the model provides more accurate results regarding the shape and displacement of the internal layers and tectonic plates. It also solves the fully nonlinear and dynamic differential equations using a semi-analytical polynomial method, which is an innovative and efficient approach.
JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS
(2023)
Article
Mechanics
F. dell'Isola, V. A. Eremeyev, V. A. Korolenko, Y. O. Solyaev
Summary: This article investigates the deformation of an initially spherical elastic body, considering the influence of the gradient of displacements on the deformation energy. By applying radial dead loads along the equator of the sphere, the analysis focuses on a specific case of second gradient continua. Unlike in first gradient continua, it is shown that these forces do not cause infinite displacement, but instead, the displacements are finite, as demonstrated using a series method for the boundary-value problem. Therefore, there is no formation of an edge at the material points where the forces are applied in the deformed configuration.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
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)