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Finite-Time Sliding-Mode Control for Semi-Markov Systems With Delayed Impulses 认领 引用 被引量：1
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作者 Fangmin Ren Xiaoping Wang +1 位作者 Yangmin Li Zhigang Zeng 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2026年第3期740-742,共3页
Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmissi... Dear Editor,This letter concerns the design of sliding mode control(SMC)for semi-Markov switching systems with time-varying transmission and impulse delay.The difficulties of this problem are:1)Time-varying transmission and impulse delay bring more nonlinear dynamic characteristics and lag effects;2)Semi-Markov mode switching introduces uncertainty;3)The reachable stage and sliding stage are affected by two types of impulses in the system,which increases the complexity of theoretical derivation. 展开更多
关键词 finite time sliding mode control sliding mode control smc semi Markov systems lag effects semi markov reachable stage sliding stage theoretical derivation impulse delay time varying transmission
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Discussions on Accurately and Efficiently Capturing Necking Onset in Uniaxial Tension Using Finite Element Modeling 认领 引用
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作者 Hengyi Zhao Peidong Lei +1 位作者 Pengfei Yang Bin Liu 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第3期241-250,共10页
Necking during uniaxial tension is a widely studied mechanical phenomenon of both theoretical and practical importance.This study investigates how to capture its onset accurately and efficiently using finite element m... Necking during uniaxial tension is a widely studied mechanical phenomenon of both theoretical and practical importance.This study investigates how to capture its onset accurately and efficiently using finite element methods.Various element types and boundary conditions are examined,including hexahedral,tetrahedral,and reduced-dimensional truss elements,under both displacement-and force-controlled loading.A counterintuitive force application issue is identified in commercial software when using tetrahedral elements,and the impact of mixed-element meshes is evaluated.It is shown that accurate necking prediction with hexahedral elements under displacement control requires a high aspect ratio and a fine mesh,while force control achieves similar accuracy with only a few elements.Truss elements perform reliably across all settings,even with minimal discretization.In contrast,mixing tetrahedral and hexahedral elements introduces errors:mesh refinement can reduce strain non-uniformity but not fully eliminate instability prediction deviations.These findings provide practical guidance for selecting element types and mesh strategies in necking simulations. 展开更多
关键词 boundary conditions finite element methodsvarious element types necking uniaxial tension finite element modeling commercial software uniaxial tension tetrahedral ele
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Multiuser Scheduling and Precoding in Cell-Free Massive MIMO Systems with Finite and Infinite Blocklengths 认领 引用
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作者 Fu Jiafei Zhu Pengcheng +2 位作者 Li Jiamin Jiang Yanxiang Wang Dongming 《China Communications》 SCIE EI CSCD 2026年第5期151-167,共17页
This paper centres on achieving the maximization of weighted throughput(WTP)in a multiuser cell-free massive multiple-input multiple-output(mMIMO)system with both finite blocklength(FBL)and infinite blocklength(INFBL)... This paper centres on achieving the maximization of weighted throughput(WTP)in a multiuser cell-free massive multiple-input multiple-output(mMIMO)system with both finite blocklength(FBL)and infinite blocklength(INFBL),which is conducted against the backdrop of constrained time-frequency resources.We aim to ensure quality of service(QoS)for all users,particularly in the FBL scenario,maintaining an acceptable latency and block error rate(BLER).To counteract the impact of reduced DoF of channel matrix due to a large number of users accessing the system,which leads to decreased system performance,we strive to optimize WTP by scheduling multiple users to different resource elements(REs)and applying precoding operations accordingly,subject to the limitations imposed by total power consumption per time slot and requisite QoS parameters.Simulation results demonstrate the superiority of the proposed multiuser processing(MUP)scheme over both single-user processing(SUP)and all-user processing(AUP)alternatives,and the proposed iterative algorithm based on genetic algorithm(GA)achieves up to 49.36%system performance gains compared to the benchmark algorithms.This substantiates the efficacy of our method in enhancing network performance and user satisfaction. 展开更多
关键词 cell-free(CF) finite blocklength(FBL) infinite blocklength(INFBL) massive multiple-input and multiple-output(mMIMO)
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Study of the mechanical properties of articular chondrocytes undergoing large deformations via the inverse finite element method combined with numerical optimization 认领 引用
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作者 Yongsheng Li Quanyou Zhang +2 位作者 Dan Zhao Jing Chen Weiyi Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期571-583,共13页
The mechanical properties of chondrocytes are closely related to the onset and progression of osteoarthritis;however,current research on the mechanical behavior of chondrocytes undergoing large deformations is insuffi... The mechanical properties of chondrocytes are closely related to the onset and progression of osteoarthritis;however,current research on the mechanical behavior of chondrocytes undergoing large deformations is insufficient.In this work,via micropipette aspiration(MPA)and atomic force microscopy(AFM)experiments on chondrocytes,finite element simulations combined with numerical optimization were conducted to obtain the mechanical parameters of three viscohyperelastic models(neo-Hookean(NH),Mooney-Rivlin(MR),and Arruda-Boyce(AB)).The results showed that for the elastic responses of chondrocytes,all three models can capture the mechanical behaviors of cells with good accuracy for both the MPA and AFM experiments,among which the AB model had the best fit.In terms of the viscoelastic behavior of chondrocytes,the single-term Prony series of the three models can describe the creep response of the MPA experiment well,whereas for the pressure relaxation behavior of the AFM experiment,the fitting degree of the single-term Prony series of the three models was low.However,the prediction ability can be significantly improved by using the two-term Prony series,for both the MPA and the AFM experiments,the AB model still yielded the best prediction of viscoelastic responses.Thus,compared with the NH and MR models,the AB model is more suitable for characterizing the elastic and viscoelastic mechanical responses of chondrocytes undergoing large deformations.This study provides an alternative methodology for investigating the large deformation mechanical properties of chondrocytes,which may help to further study and reveal the mechanotransduction mechanisms of chondrocytes. 展开更多
关键词 Chondrocytes Large deformation Finite element simulation Mechanical properties Numerical optimization
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Phonon bottleneck effect due to finite shrinking gap revealed by high-pressure ultrafast dynamics 认领 引用
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作者 Yanling Wu Q.Wu +9 位作者 X.Yin Y.X.Huang Takeshi Nakagawa Z.Y.Tian Fei Sun Q.M.Zhang Jun Chang Ho-kwang Mao Yang Ding Jimin Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第3期137-142,共6页
High-pressure ultrafast dynamics has been recently developed,enabling the exploration of non-equilibrium properties of various quantum materials under high pressure.Particularly,by investigating the pressure dependenc... High-pressure ultrafast dynamics has been recently developed,enabling the exploration of non-equilibrium properties of various quantum materials under high pressure.Particularly,by investigating the pressure dependence of time-resolved ultrafast dynamics,we have discovered a pressure-induced phonon bottleneck effect(PBE).To date,all reported PBEs are due to fully closed gaps,which was reflected in the simultaneous characteristic changes in both amplitude and lifetime of the phonon-phonon scattering slow relaxation component.However,as reflected through its connection to Euler disk,incompletely closed gaps can also induce PBEs.In this work,we report the first PBE due to a finite shrinking gap.As is known,it is challenging to directly observe high-pressure-induced variations in electronic band gaps due to the diamond anvil cell.Here,by investigating Sr2IrO4in our previous work,we obtain an empirical formula for the pressure-induced energy gap variation at room temperature.Our quantitative analysis shows that the gap is finite shrinking rather than fully closed. 展开更多
关键词 phonon bottleneck effect ultrafast dynamics high pressure ultrafast spectroscopy finite gap
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OPFEM:architectural design and implementation of a CAE software for finite element modeling and simulation 认领 引用
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作者 Wei Huang Qun Huang +3 位作者 Jie Yang Xiaowei Bai Tianyun He Heng Hu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期264-333,共70页
To address challenges in architectural extensibility and cross-module collaboration of CAE software,this study proposes OPFEM(open-source Python-based finite element modeling)—an open-source framework featuring a uni... To address challenges in architectural extensibility and cross-module collaboration of CAE software,this study proposes OPFEM(open-source Python-based finite element modeling)—an open-source framework featuring a unified four-layer architecture.The geometric modeling framework achieves plug-in support for geometric kernels through an interface abstraction layer and adapter patterns,decoupling kernel-specific implementations while enabling state machine-driven interaction design and parametric sketching.The pre-processing modules establish multi-level associations among materials,sections,and geometric entities using Composite and Factory patterns,while implementing Observer pattern to ensure geometric-mesh consistency and employing finite-state machines to optimize boundary workflows.The computational modules implement a modular finite element library that decouples topology from element attributes,along with a surface boundary element technique for load conversion and task-scheduling management,validated through a cantilever beam large-deformation case.The post-processing module facilitates standardized data storage and dynamic field visualization through architecture-level standardized interface definitions and hierarchical component design.Collectively,OPFEM achieves full-process integration from parametric modeling to nonlinear solving and visualization,enhancing configuration efficiency and providing an extensible,pattern-driven solution for complex CAE challenges. 展开更多
关键词 Finite element method CAE software architecture Object-oriented programming Modular design Opensource software
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Finite element model updating methodology and application to flexible resonance of high-speed railway vehicles 认领 引用
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作者 Chao CHANG Liang LING +3 位作者 Xiaoyi MA Fansong LI Tao LIU Wanming ZHAI 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第2期109-127,共19页
The flexible resonance phenomenon of a carbody greatly affects the stability and safety of high-speed trains.Therefore,an accurate finite element(FE)model is crucial for establishing a rigid-flexible multi-body dynami... The flexible resonance phenomenon of a carbody greatly affects the stability and safety of high-speed trains.Therefore,an accurate finite element(FE)model is crucial for establishing a rigid-flexible multi-body dynamics model and revealing the flexible resonance mechanism of high-speed trains.In this paper,we introduced an effective calibration and validation methodology for a carbody FE model of high-speed trains based on experimental modal analysis(EMA).A detailed three-dimensional(3D)carbody FE model that considered practical constraints was developed,and the carbody material parameters were optimized using a genetic algorithm(GA).Based on the updated model,a high-speed railway vehicle-track rigid-flexible coupled dynamics model was established.Results showed excellent agreement between the numerical simulations and field measurements.The proposed method was able to accurately reproduce the carbody flexible resonance phenomenon and elastic modal frequency observed on site. 展开更多
关键词 High-speed train Carbody flexible resonance Finite element(FE) Model updating Modal frequency
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Sintering bed state optimization model constructed by finite element and intelligent algorithms 认领 引用
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作者 Ran Liu Huan Jin +4 位作者 Song Liu Xiao-Jie Liu Jian-Hai Hao Jun Zhao Qing Lv 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第4期134-152,共19页
To ensure the uniformity of the gas flow in the sintering material layer,improve the sintering efficiency,and reduce the production energy consumption,it is of great significance to predict the permeability index of t... To ensure the uniformity of the gas flow in the sintering material layer,improve the sintering efficiency,and reduce the production energy consumption,it is of great significance to predict the permeability index of the original material layer in advance.However,how to achieve accurate prediction in line with the actual production environment has always been a challenge.Based on this,deep learning was combined with finite element numerical simulation,and an integrated prediction method with high interpretability and controllability was proposed.This method used the wavelet threshold denoising technology jointly improved based on complete ensemble empirical mode decomposition with adaptive noise(CEEN)to process the original data,so as to improve the data quality.Subsequently,a temporal convolutional network-long short-term memory(TCN-LSTM)model was constructed and trained for permeability prediction.Comparative analysis showed that the proposed model has a higher prediction accuracy than other comparative models,with the coefficient of determination R2 as high as 95%.In the experimental simulation stage,taking a 360 m2 sintering machine of a certain steel plant as the research object,the COMSOL finite element software was used to establish a physical model for process simulation.The results showed that the variation curve of the permeability of the material layer along the depth direction is highly consistent with the measured results,with a relative error of approximately 3.90 and the R2 of 92.38%.In addition,based on the results of finite element numerical simulation,when using the TCN-LSTM model for prediction,the difference between the predicted value and the simulated value is small,with an average relative error of only 4.92%and the R2 of 97.29%,showing a high degree of fitting and matching.Therefore,the method of combining finite element numerical simulation with CEEN-TCN-LSTM can accurately predict the permeability index of the material layer,effectively meeting the dual needs of predicting the permeability in advance and monitoring the change process of the material layer in actual production and providing technical support for the optimization of the sintering process and the production of high-quality sinter. 展开更多
关键词 Permeability index Deep learning Finite element numerical simulation CEEN-TCN-LSTM COMSOL Sintering bed state
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An Arbitrary Lagrangian-Eulerian(ALE)Finite Element Potential Flow Solver for Fully Nonlinear Free Surface Flows and Wave-Structure Interactions in the Time Domain 认领 引用
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作者 SONG Zhi-wei ZHU Pei-qiao +4 位作者 ZHU Jun-jie GAO Jun-liang LIU Ying-yi CHEN Da XIE Ming-xiao 《China Ocean Engineering》 SCIE EI CSCD 2026年第2期341-356,共16页
A fully nonlinear potential flow(FNPF)solver has been developed using the Finite Element Method(FEM)to simulate time-domain interactions between free-surface waves and marine structures.The ALE framework is implemente... A fully nonlinear potential flow(FNPF)solver has been developed using the Finite Element Method(FEM)to simulate time-domain interactions between free-surface waves and marine structures.The ALE framework is implemented alongside a segment spring analogy-based moving mesh strategy to accurately track evolving free surfaces and moving boundaries of floating bodies.The solver employs a preconditioned conjugate gradient method to efficiently resolve the resulting sparse,symmetric linear system at each time step.Temporal evolution is managed through a standard fourth-order Runge-Kutta scheme,while Chebyshev 5-point smoothing suppresses non-physical saw-tooth instabilities.The solver’s performance and reliability are verified through comprehensive benchmark tests,including freesurface sloshing,nonlinear wave propagation,and wave-structure interactions with submerged or floating bodies.Furthermore,the study explores a modified potential flow model incorporating a quadratic damping term to address viscous effects in gap/moonpool resonance problems. 展开更多
关键词 fully nonlinear water waves finite element method ALE potential flow theory
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Finite Element Analysis of Micromorphic Electrodynamics 认领 引用
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作者 Jiaoyan Li James D.Lee 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第5期325-379,共55页
The key points of micromorphic theory,including the balance laws and entropy principle,are briefly introduced.Maxwell’s equations and the Lorentz Transformation of E and B fields in both relativistic and nonrelativis... The key points of micromorphic theory,including the balance laws and entropy principle,are briefly introduced.Maxwell’s equations and the Lorentz Transformation of E and B fields in both relativistic and nonrelativistic electromagnetic theory are discussed.The link between the thermomechanical part and the electromagnetic part of the micromorphic electromagnetic theory is established through the body force,body moment,and energy source.The constitutive theory for thermo-visco-elastic-plastic-electromagnetic(TVEP-EM)materials is formulated.Then the constitutive relations are reduced to the materially linear constitutive equations.Onsager’s postulate is utilized for the derivation of viscosity.Return-Mapping-Algorithm is invoked for plasticity.It is a well-known physical fact that the electric field E and the magnetic flux B are not independent of each other.To resolve this problem,the scalar potentialϕand the vector potential A are introduced and derived,which are related to the electric field and magnetic flux as B≡∇×A and E≡−∇ϕ−1 c∂A∂t.Finite element formulations are rigorously derived.On each node,there are displacements,micromotions,temperature,scalar,and vector potentials.It is numerically impossible and physically meaningless to solve the five sets of finite element equations simultaneously.We propose to solve the problem of a hollow cylinder subjected to twist in two stages.In the first stage,the static or nearly static solutions for displacements,micromotions,plastic strains,and temperatures are obtained.In the second stage,the propagation of scalar and vector potentials under the influence of deformations and temperature gradients is investigated.The material of micromorphic theory can contain more complex substances,so it can be utilized to treat blood,bubbly fluids,liquid crystals,etc.Incorporating the coupling between thermomechanics and electromagnetics in micromorphic theory can further enhance the understanding and prediction of large classes of physical phenomena and provide many technological applications.Phenomenologically important cross-effects,such as Peltier,Seebeck,Hall,Ettingshausen,Righi-Leduc,and Nernst effects,can now be studied theoretically and numerically. 展开更多
关键词 Micromorphic theory thermomechanical-electromagnetic coupling plasticity finite element formulation Maxwell equations
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Insights into microstructural variations in GH4169 thin-walled parts by laser powder bed fusion:a coupling finite-element/cellular-automaton study 认领 引用
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作者 Peng-Hang Ling Wu-Gui Jiang +3 位作者 Zhan-Cai Zhan Tao Chen Qing-Hua Qin Long-Hui Mao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第7期188-204,共17页
The complex characteristics of thin-walled parts fabricated by laser powder bed fusion(LPBF),particularly the dependence of their microstructures on wall thickness and scanning strategies,pose significant challenges f... The complex characteristics of thin-walled parts fabricated by laser powder bed fusion(LPBF),particularly the dependence of their microstructures on wall thickness and scanning strategies,pose significant challenges for this technology.This paper presents a predictive model for microstructural evolution of LPBF-fabricated thin-walled components,integrating three-dimensional cellular automaton(CA)with finite element(FE)analysis.The FE method is employed to solve the temperature field of thin-walled components during LPBF,and the resulting temperature history is used to predict micro-structural evolution in the CA model.Experimental validation via electron back scatter diffraction(EBSD)on a 4 mm-thick specimen confirms a high degree of agreement between model predictions and experimental results.The study reveals that when the thickness of samples prepared by LPBF is reduced from 4 mm to 0.4 mm,there is a significant coarsening of grain size.Additionally,grains at the bottom are observed to be coarser compared to those at the top,which is attributed to epitaxial growth and remelting.Furthermore,the study explores microstructural changes induced by manipulating laser power and scanning speed,while maintaining constant energy density.The findings indicate that grain morphology and size remain consistent across varying parameters,emphasizing the dominant influence of energy density.Within a predefined scanning strategy,an upsurge in laser energy density leads to an enlargement of the average grain size.Notably,the implementation of a cross-scanning strategy alters the melt pool orientation,disrupting the directional grain growth and fostering the formation of finer grains.This underscores the crucial significance of processing techniques in LPBF. 展开更多
关键词 Laser powder bed fusion Thin-walled components Cellular automaton Finite element Microstructural evolution
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Localized Topological States in Finite Non-Hermitian Photonic Lattices 认领 引用
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作者 Xiong Fan Wenchi Zang +2 位作者 Ming Ma Li-Gang Wang Tianxing Ma 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第4期142-153,共12页
Edge states hybridize in finite-size topological materials,opening a gap between edge states which weakens the topological protection.Recent studies discover the recovery of zero modes in the finite-size non-Hermitian... Edge states hybridize in finite-size topological materials,opening a gap between edge states which weakens the topological protection.Recent studies discover the recovery of zero modes in the finite-size non-Hermitian Su-Schrieffer-Heeger photonic lattices,which is of significance for fault-tolerant photonic integrations.In this paper,we reveal that the underlying mechanism is level attraction,a phenomenon common in non-Hermitian systems. 展开更多
关键词 level attractiona gap edge states localized topological states non hermitian photonic lattices edge states hybridization edge states hybridize finite size topological materials
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Topological optimization design and biomechanical analysis of a novel titanium-PEEK multilayer cage in ACDF surgery:a finite element study 认领 引用
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作者 Yusheng Jin Qianqian Zhang +4 位作者 Chenjia Zhang Liming He Haoyu Feng Lingfeng Chen Weiyi Chen 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期565-574,共10页
Anterior cervical discectomy and fusion is the gold standard for the treatment of cervical spondylosis,with the cage playing a crucial role in maintaining intervertebral height and promoting bone fusion.However,cages ... Anterior cervical discectomy and fusion is the gold standard for the treatment of cervical spondylosis,with the cage playing a crucial role in maintaining intervertebral height and promoting bone fusion.However,cages made from single materials,such as polyetheretherketone(PEEK)or titanium alloys,often suffer from limitations like low fusion rates and high risks of subsidence.This study aims to design a multilayer cervical cage optimized through topological optimization,featuring a titanium alloy outer layer and a PEEK inner layer,combining the advantages of both materials to improve fusion rates and reduce the risk of subsidence.A finite element model of the C3-C7 cervical spine was developed,with a simplified ROI-C cage implanted at the C5-C6 segment for topological optimization.The multilayer cage was then redesigned based on the topological optimization result,and its biomechanical performance was compared with that of PEEK and titanium alloy cages.The results showed that there were no significant differences in postoperative cervical range of motion among the three types of cages.The facet joint force of the surgical segment significantly decreased in all models,with the titanium alloy cage model showing the greatest decrease and the PEEK cage model showing the least.The stress distribution at the contact interface between the titanium alloy cage and the vertebral body was the most concentrated,while it was the most uniform in the PEEK cage.In conclusion,the multilayer cage combines the advantages of both titanium alloy and PEEK,ensuring postoperative vertebral stability while reducing stress concentration at the contact interface with the vertebral body.This novel multilayer cage offers a new perspective on the selection of cages in clinical practice. 展开更多
关键词 Anterior cervical discectomy and fusion,Cage Topology optimize Subsidence Vertebral stability Finite element analysis
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Effect of Toe Box Space on Metatarsal Stress and Lower Limb Biomechanics:Insights from an Integrated Finite Element Model 认领 引用
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作者 Qincheng Ge Huiyu Zhou +5 位作者 Datao Xu Zanni Zhang Xiuye Qu Tianxiao Chen Ukadike Chris Ugbolue Yaodong Gu 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1588-1604,共17页
During stop-jumping landings,variations in toe box space(TBS)may influence lower limb movement strategies.This study aimed to investigate the effects of TBS on metatarsal(MT)stress distribution and lower limb biomecha... During stop-jumping landings,variations in toe box space(TBS)may influence lower limb movement strategies.This study aimed to investigate the effects of TBS on metatarsal(MT)stress distribution and lower limb biomechanics.Twenty-eight basketball players participated,wearing tight-fitting(TF)and loose-fitting(LF)shoes.An integrated foot-ankle-shoe-knee finite element model(FEM)was established to obtain MT1−MT5 stress.The peak metatarsophalangeal joint dorsiflexion angle(PMDA)was measured and its relationships with peak MT stress and 13 ankle and knee parameters were analyzed.TF shoes significantly restricted metatarsophalangeal joint(MPJ)dorsiflexion(P<0.001),and PMDA was correlated with all variables except peak ankle inversion angle(PAIA)(R2=0.209).MT stress was more concentrated in the central region.These findings suggest that restricted TBS limits MPJ mobility,and lower PMDA is linked to central MT2 stress distribution and compensatory loading at proximal joints,potentially increasing injury risk.This study provides biomechanical insights for basketball shoe selection and injury prevention in high-impact sports. 展开更多
关键词 Basketball shoes Stop-jumping landing Finite element analysis First metatarsophalangeal joint Toe box space
Finite Element Simulation of Volume Forming of High-Temperature Superconducting MgB2Wire:Construction Through Constitutive Models of Metals and Powders 认领 引用
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作者 Hu Le Hou Hongli +5 位作者 Yang Fang Wang Qingyang Zhang Shengnan Liu Jixing Yan Guo Zhang Pingxiang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第7期1692-1700,共9页
Tensile mechanical tests at room temperature with varying strain rates(0.001,0.01,and 0.07 s−1)were conducted on Cu tubes(as-processed state),Nb tubes(soft state),and Mg rods(extruded state)used for internal magnes... Tensile mechanical tests at room temperature with varying strain rates(0.001,0.01,and 0.07 s−1)were conducted on Cu tubes(as-processed state),Nb tubes(soft state),and Mg rods(extruded state)used for internal magnesium diffusion(IMD)-MgB2single-core wires.Uniaxial unidirectional mechanical tests and cyclic compression mechanical tests at room temperature were performed on B powder to obtain the stress-strain curves.Based on the abovementioned analysis results,Johnson-Cook constitutive models for three metals at room temperature were established,as well as the function between the elastic modulus of B powder and its relative density.Furthermore,the bulk deformation of IMD-MgB2single-core wires during room-temperature rolling was simulated using the DEFORM finite element software,and the deformation behavior and stress distribution of materials were analyzed.Results demonstrate that the Johnson-Cook models established for three metals and the elastic modulus-relative density function of B powder accurately describe the flow behavior of Cu,Nb,and Mg in IMD-MgB2wires,as well as the elastic deformation of B powder.DEFORM finite element simulation results can also effectively reflect the deformation behavior of IMD-MgB2single-core wires.The overall deformation during the rolling process is uniform with a homogeneous stress distribution;however,the surface still has defects.This study provides a theoretical basis for optimizing the plastic forming process of IMD-MgB2superconducting wires. 展开更多
关键词 high-temperature superconductor wire MgB2 constitutive model finite element simulation
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Finite element method for transient response of viscoelastic multidirectional FGP skew-nanoplate resting on visco-Pasternak foundation taking into account surface effect using nonlocal strain gradient theory 认领 引用
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作者 Thu Huong Nguyen Thi Van Ke Tran +1 位作者 Pham Hoang Tu Pham Hong Thao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期110-135,共26页
The finite element approach is used for the first time to simulate and examine the free oscillation and transient response of a visco-elastic multi-directional functionally graded porous(MFGP)skew-nanoplate,taking int... The finite element approach is used for the first time to simulate and examine the free oscillation and transient response of a visco-elastic multi-directional functionally graded porous(MFGP)skew-nanoplate,taking into account surface effects using nonlocal strain gradient hypothesis.The mechanical characteristics of the materials vary in all three directions of length,width,and thickness of the plate according to the exponential law.Additionally,it has viscoelastic behavior according to the Kelvin-Voigt model.The novelty of this paper lies in the incorporation of the spatial variability of nonlocal and lengthscale factors as additional mechanical characteristics of the material.The overall equation of motion for the plate is derived by including the classical plate hypothesis and Hamilton’s principle.A quadrilateral plate element with four nodes and six degrees of freedom is created using a non-conforming C2-level Hermitian function.This function offers precise results and rapid convergence for various forms and boundary conditions(BCs)that low-order elements cannot accomplish.The Newmark-beta direct integration technique is used to calculate the transient responses of the visco-elastic MFGP skew-nanoplate under various BCs.Furthermore,a thorough assessment of the impacts of several factors such as residual surface stress,grading indices,elastic foundation stiffness,skew angle,other geometrical parameters,and BCs on the transient responses of the viscoelastic MFGP skew-nanoplate has been uncovered. 展开更多
关键词 Nonlocal strain gradient hypothesis Surface effect Finite element method Variable length scale Nonlocal coefficient
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A Hybrid Experimental-Numerical Framework for Identifying Viscoelastic Parameters of 3D-Printed Polyurethane Samples:Cyclic Tests,Creep/Relaxation and Inverse Finite Element Analysis 认领 引用
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作者 Nikita Golovkin Olesya Nikulenkova +4 位作者 Vsevolod Pobezhimov Alexander Nesmelov Sergei Chvalun Fedor Sorokin Arthur Krupnin 《Computers, Materials & Continua》 SCIE EI 2026年第3期519-536,共18页
This study presents and verifies a hybrid methodology for reliable determination of parameters in structural rheological models(Zener,Burgers,and Maxwell)describing the viscoelastic behavior of polyurethane specimens ... This study presents and verifies a hybrid methodology for reliable determination of parameters in structural rheological models(Zener,Burgers,and Maxwell)describing the viscoelastic behavior of polyurethane specimens manufactured using extrusion-based 3D printing.Through comprehensive testing,including cyclic compression at strain rates ranging from 0.12 to 120 mm/min(0%-15%strain)and creepelaxation experiments(10%-30%strain),the lumped parameters were independently determined using both analytical and numerical solutions of the models’differential equations,followed by cross-verification in additional experiments.Numerical solutions for creep and relaxation problems were obtained using finite element analysis,with the three-parameter Mooney-Rivlin model and Prony series employed to simulate elastic and viscous stress components,respectively.Energy dissipation per cycle was quantified during cyclic compression tests.The results demonstrate that all three models adequately describe material behavior within the 0%-15%strain range across various strain rates.Comparative analysis revealed the Burgers model’s superior performance in characterizing creep and stress relaxation at low strain levels.While Zener and Burgers model parameters from uniaxial compression showed limited applicability for energy dissipation calculations,the generalized Maxwell model effectively captured viscoelastic properties across different strain rates.Notably,parameters derived from creep tests provided a more universal assessment of dissipative properties due to optimization based on characteristic curve regions.Both parameter sets described polyurethane’s elastic-hysteretic behavior with approximately 20%error,proving significantly more accurate than the linear strain-time dependence hypothesis.Finite element analysis(FEA)complemented numerical modeling by demonstrating that while the generalized Maxwell model effectively describes initial rapid stress-strain changes,FEA provides superior characterization of steady-state processes.This computational approach yields more physically representative results compared to simplified analytical solutions,despite certain limitations in transient analysis. 展开更多
关键词 Viscoelasticity cyclic compression hysteresis creep stress relaxation finite element method optimization 3D printing structural rheological models Prony series
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A novel overset grid strategy and high-order inter-grid boundaries treatment with the cell-centered finite difference method 认领 引用
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作者 Xuejun DING Fei LIAO +1 位作者 Yao JIN Jinsheng CAI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期256-281,共26页
This paper presents an efficient and automated Overset Grid Assembly(OGA)method for the structured grid,and investigates high-order interpolation methods for inter-grid boundaries with the cell-centered finite differe... This paper presents an efficient and automated Overset Grid Assembly(OGA)method for the structured grid,and investigates high-order interpolation methods for inter-grid boundaries with the cell-centered finite difference method.Four enhancements are introduced:a hybrid holecutting approach integrates the efficiency of approximate hole-cutting and the accuracy and robustness of direct-cutting,effectively addressing challenges such as small gaps and thin cuts;an improved implicit hole boundary optimization method,incorporating quality comparison,can significantly reduce donor search workloads;an improved implicit interpolation cell cancellation algorithm minimizes overlap regions,particularly beneficial for high-order interpolation with large stencils;an algorithm for identifying and eliminating islands without using wall distances,effectively removes islands.The OGA results of a multi-element airfoil,a circular array of cylinders,multiple spheres,and a wing-pylon-store configuration indicate that the proposed method would be a suitable selection for multi-body problems,even in the presence of small gaps and thin geometries.Additionally,for high-order interpolation at inter-grid boundaries,this study presents an optimized interpolation method designed to minimize spectral property errors.Numerical results indicate that for periodic problems frequently crossing inter-grid boundaries,the optimized interpolation is more accurate than classical Lagrange interpolation and would be a suitable selection. 展开更多
关键词 Cell-centered finite difference method High-order Optimized interpolation Overset grid method
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A Surrogate Deep-Learning Super-Resolution Framework for Accelerating Finite Element Method-Based Fluid Simulations 认领 引用
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作者 Sojin Shin Guk Heon Kim +1 位作者 Seung Hwan Kim Jaemin Kim 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第3期593-613,共21页
This study develops a surrogate super-resolution(SR)framework that accelerates finite element method(FEM)-based computational fluid dynamics(CFD)using deep learning.High-resolution(HR)FEM-based CFDremains computationa... This study develops a surrogate super-resolution(SR)framework that accelerates finite element method(FEM)-based computational fluid dynamics(CFD)using deep learning.High-resolution(HR)FEM-based CFDremains computationally prohibitive for time-sensitive applications,including patient-specific aneurysm hemodynamics where rapid turnaround is valuable.The proposed pipeline learns to reconstruct HR velocity-magnitude fields fromlow-resolution(LR)FEM solutions generated under the same governing equations and boundary conditions.It consistsof three modules:(i)offline pre-training of a residual network on representative vascular geometries;(ii)lightweightfine-tuning to adapt the pretrained model to geometric variability,including patient-specific aneurysm morphologies;and(iii)an unstructured-to-structured sampling strategy with region-of-interest upsampling that concentrates resolution in flow-critical zones(e.g.,the aneurysm sac)rather than the full domain.This targeted reconstruction substantiallyreduces inference and post-processing cost while preserving key HR flow features.Experiments on cerebral aneurysmmodels show that HR velocity-magnitude fields can be recovered with accuracy comparable to direct HR simulationsat less than 1%of the direct HR simulation cost per analysis(LR simulation and SR inference),while adaptation to newgeometries requires only lightweight fine-tuning with limited target-specific HR data.While clinical endpoints andadditional variables(e.g.,pressure or wall-based metrics)are left for future work,the results indicate that the proposedsurrogate SR approach can streamline FEM-based CFD workflows toward near real-time hemodynamic analysis acrossmorphologically similar vascular models. 展开更多
关键词 Surrogate modeling deep learning super-resolution finite element method(FEM) fluid simulation
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