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OPFEM:architectural design and implementation of a CAE software for finite element modeling and simulation 认领 引用
1
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 Simulation of Volume Forming of High-Temperature Superconducting MgB2Wire:Construction Through Constitutive Models of Metals and Powders 认领 引用
2
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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A Surrogate Deep-Learning Super-Resolution Framework for Accelerating Finite Element Method-Based Fluid Simulations 认领 引用
3
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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Finite element analysis and simulation of structures design with locally produced concrete on the Earth,Mars,and the Moon 认领 引用
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作者 Umit AKSOY Yagmur DIKICIASIK Sadik Alper YILDIZEL 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第3期605-622,共18页
Humanity’s growing interest in space colonization has intensified the search for sustainable construction methods on extraterrestrial surfaces.This research addresses the logistical and economic challenges of transpo... Humanity’s growing interest in space colonization has intensified the search for sustainable construction methods on extraterrestrial surfaces.This research addresses the logistical and economic challenges of transporting construction materials from Earth to the Moon and Mars.The hypothesis proposes that concrete-like materials manufactured from locally available resources can offer viable structural solutions in planetary environments.Finite element simulations were conducted using ABAQUS to evaluate buildings constructed with reactive powder concrete(Earth),lunarcrete(Moon),and sulfur concrete(Mars)under seismic,thermal,wind,radiation,and meteorite impact conditions.Simulation results showed that each material remained within safe structural limits for its respective environment,though significant thermal and radiation vulnerabilities were observed.These findings suggest the technical feasibility of utilizing in situ materials for extraterrestrial construction,while emphasizing the need for further development in insulation and radiation shielding technologies. 展开更多
关键词 earth moon mars concrete finite element analysis in situ resource utilization planetary habitat design structural simulation space construction materials thermal and radiation analysis
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Analysis of DC Aging Characteristics of Stable ZnO Varistors Based on Voronoi Network and Finite Element Simulation Model 认领 引用
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作者 ZHANG Ping LU Mingtai +1 位作者 LU Tiantian YUE Yinghu 《材料导报》 EI CAS CSCD 北大核心 2026年第2期20-28,共9页
In modern ZnO varistors,traditional aging mechanisms based on increased power consumption are no longer relevant due to reduced power consumption during DC aging.Prolonged exposure to both AC and DC voltages results i... In modern ZnO varistors,traditional aging mechanisms based on increased power consumption are no longer relevant due to reduced power consumption during DC aging.Prolonged exposure to both AC and DC voltages results in increased leakage current,decreased breakdown voltage,and lower nonlinearity,ultimately compromising their protective performance.To investigate the evolution in electrical properties during DC aging,this work developed a finite element model based on Voronoi networks and conducted accelerated aging tests on commercial varistors.Throughout the aging process,current-voltage characteristics and Schottky barrier parameters were measured and analyzed.The results indicate that when subjected to constant voltage,current flows through regions with larger grain sizes,forming discharge channels.As aging progresses,the current focus increases on these channels,leading to a decline in the varistor’s overall performance.Furthermore,analysis of the Schottky barrier parameters shows that the changes in electrical performance during aging are non-monotonic.These findings offer theoretical support for understanding the aging mechanisms and condition assessment of modern stable ZnO varistors. 展开更多
关键词 ZnO varistors Voronoi network DC aging finite element method(FEM) current distribution double Schottky barrier theory
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Finite element simulation of the defect generation mechanism in large titanium alloy frame forgings 认领 引用
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作者 LU Qi MENG Qingtong LI Zhe 《Baosteel Technical Research》 CAS 2026年第2期11-17,共7页
The finite element method can be used to numerically simulate and reproduce the metal flow during forging;the corresponding results can be used to optimize manufacturing processes.The forging of TA15 titanium alloy fr... The finite element method can be used to numerically simulate and reproduce the metal flow during forging;the corresponding results can be used to optimize manufacturing processes.The forging of TA15 titanium alloy frame forgings with a projected area of 1.1 m2,a maximum diagonal distance of~1300 mm,and numerous complex structures featuring high reinforcement and thin walls was analyzed herein.The formation mechanisms of folding and missing metal defects were analyzed,and an improvement plan was proposed based on the metal distribution in the preform.The forging process was then optimized to obtain high-quality forgings. 展开更多
关键词 finite element TA15 titanium alloy large size complex structure folding and missing metal defects
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Dynamic Finite Element Simulation Analysis of Table Tennis Hitting 认领 引用
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作者 Jiahao Yang Enze Liu 《Journal of Electronic Research and Application》 2026年第5期159-170,共12页
The process of hitting a table tennis ball involves complex dynamic behaviors,in which the ball’s velocity,spin,and deformation characteristics directly affect the shot outcome.Based on the finite element simulation ... The process of hitting a table tennis ball involves complex dynamic behaviors,in which the ball’s velocity,spin,and deformation characteristics directly affect the shot outcome.Based on the finite element simulation method,this study establishes a simplified model of the interaction between the table tennis ball and the racket.Two typical hitting patterns are simulated in the research:one dominated by impact namely the fast attack technique,while the other dominated by friction,referring to the loop drive stroke.The results indicates that in the impact mode with a normal speed of 20 m/s,the table tennis ball attains a maximum speed of 45 m/s,along with a spin of about 450 rpm.By comparison,in the friction mode with a tangential speed of 20 m/s,the ball spins at about 900 rpm but has a lower outgoing ball velocity at about 9 m/s.The simulation clearly reveals the dynamic patterns of ball deformation,energy transfer,and the evolution of the ball’s motion state.It also verifies the regulatory effect of hitting angle and speed on the ball release.This research provides quantitative evidence for the scientific training and equipment optimization in table tennis,while also demonstrating the practical value of finite element simulation in the field of sports engineering. 展开更多
关键词 Table tennis Finite element simulation Ball dynamics Spin Speed
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A straightforward 3D polycrystal plasticity finite element method for dynamic/static recrystallization simulation 认领 引用 被引量：1
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作者 Guowei Zhou Yuanzhe Hu +2 位作者 Ronghui Hu Peidong Wu Dayong Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第17期180-198,共19页
The microstructure and related property evolution induced by dynamic recrystallization(DRX)and static recrystallization(SRX)in thermo-mechanical process are two critical factors for the metal forming.The DRX and SRX a... The microstructure and related property evolution induced by dynamic recrystallization(DRX)and static recrystallization(SRX)in thermo-mechanical process are two critical factors for the metal forming.The DRX and SRX are determined by the grain level deformation and sequentially coupled.In order to fully capture the microstructure and mechanical property evolution,a crystal plasticity finite element based modelling method for DRX and SRX is proposed in the current work.The grain level deformation is calculated with crystal plasticity which is coupled with the recrystallization model straightforwardly,and both the grain deformation and microstructure evolution are updated simultaneously.The proposed method is validated with discontinuous DRX experiments and the effects of initial deformation conditions are well-captured.Two controversial mechanisms for recrystallization microstructure evolution,i.e.oriented nucleation and growth selection,are discussed in the current framework with the advantages of accurate grain level deformation and interaction predictions.Furthermore,the sequentially coupled DRX and SRX are modelled seamlessly in the current work which provides a critical method for fully integrated thermo-mechanical processes analysis. 展开更多
关键词 Dynamic recrystallization Static recrystallization Crystal plasticity finite element method Microstructure Growth selection
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Stress gradient versus strain gradient in polycrystalline high entropy alloy revealed by crystal plasticity finite element simulation 认领 引用 被引量：3
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作者 Libo Yu Weipeng Li +2 位作者 Weizheng Lu Hui Feng Qihong Fang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第10期1-15,共15页
Gradient structures(GS)play a crucial role in achieving a balance between strength and plasticity in metals and alloys.However,there is still a lack of understanding of the mechanisms that maintain a plasticity gradie... Gradient structures(GS)play a crucial role in achieving a balance between strength and plasticity in metals and alloys.However,there is still a lack of understanding of the mechanisms that maintain a plasticity gradient to prevent the premature failure of fine grains in GS materials.In this work,by incorporating experimental data and the Hall-Petch relationship,we develop a size-dependent crystal plasticity model to investigate the deformation mechanisms for enhancing the strength and plasticity in polycrystalline high entropy alloys.The simulations of the GS model align well with the experimental results,exhibiting strong strain and stress gradients to improve the mechanical properties.Under the conditions of significant de-formation incompatibility,the strain gradient predominantly drives the enhancement of plasticity mechanisms.As the de-formation incompatibility decreases,the stress gradient begins to play a significant role in comparison with the strain gradient.This shift is attributed to the regular variations in dislocation density within different domains.As the grain size gradients and loads decrease,the dislocation density becomes more uniform across the domains,hindering the formation of strong domain boundaries.While this may impede the activation of strain gradients,it facilitates the activation of stress gradients as a supplementary measure.By designing multilayered GS structures to alter the distribution of dislocation density,we can control the activation levels of stress and strain gradients,thereby influencing the plasticity mechanisms and mechanical properties of the material. 展开更多
关键词 Gradient structure Plasticity gradient Dislocation density Strain gradient Stress gradient Crystal plasticity finite element
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Forming process study of laser power bed fusion H13 steel by finite element simulation and experiment 认领 引用 被引量：1
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作者 Yu-hua Deng Jian-yong Wang +8 位作者 Liang-liang Zhang Ji-lie Zhu Ying-kang Wei Wei Liu Li-xiong Han Zhuo-ran Shi Yao-Jia Ren Shu-feng Yang Shi-feng Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2025年第11期3994-4005,共12页
The molten pool size,residual stress and defects of H13 steel prepared by laser powder bed fusion(LPBF)under various process parameters were investigated.The residual stress range for both defective and crack-free sam... The molten pool size,residual stress and defects of H13 steel prepared by laser powder bed fusion(LPBF)under various process parameters were investigated.The residual stress range for both defective and crack-free samples was 1420-1550 MPa.High scanning speeds led to incomplete melting defects,whereas low scanning speeds resulted in crack defects.Additionally,finite element simulation was employed to elucidate the defect formation mechanisms in H13 steel produced via LPBF process.We developed optimal parameters for LPBF of H13 steel,achieving a relative density of 99.8% in the prepared samples.The analysis indicated that crack formation primarily resulted from stress concentration at grain boundaries.Furthermore,the samples comprised α-Fe phase and a minor amount of retained γ-Fe austenite phase,facilitated by high solidification rates and low residual stress.In conclusion,optimizing LPBF manufacturing process for H13 steel requires considering both the impact of parameters on defect formation and the influence of the forming process on martensite and retained austenite. 展开更多
关键词 Laser powder bed fusion H13 steel Finite element Residual stress Cracking
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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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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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Finite Element Simulation of Interstitial–Lymphatic Fluid Flow and Nanodrug Transport in a Solid Tumor:An Intratumoral Injection Approach 认领 引用
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作者 Gobinda Debnath Buddakkagari Vasu Rama Subba Reddy Gorla 《Biomedical Engineering Frontiers》 EI CAS 2025年第1期311-342,共32页
Objective:This study presents a mathematical model and finite element simulations to investigate interstitial fluid flow and nanodrug transport in a solid tumor,incorporating transvascular exchange,convection–diffus... Objective:This study presents a mathematical model and finite element simulations to investigate interstitial fluid flow and nanodrug transport in a solid tumor,incorporating transvascular exchange,convection–diffusion–reaction dynamics,and intratumoral injection mechanisms.Impact Statement:Optimizing nanodrug distribution remains a critical challenge in cancer therapy.The proposed model advances nanomedicine by enhancing the mechanistic understanding of nanodrug transport in a solid tumor.Introduction:Cancer,a global threat,often manifests as solid tumors driven by uncontrolled cell growth.The heterogeneous microenvironment,lymphatic drainage,nano-bio interactions,and elevated interstitial fluid pressure(IFP)hinder effective nanodrug delivery.Nanoparticle(NP)-based drug delivery systems offer a promising solution,with FES providing an effective approach to model and simulate the complex delivery process.Methods:The model considered a spherical and symmetrical tumor architecture comprising a central necrosis region,viable tumor,and surrounding healthy tissue with functional lymphatic dynamics.Substantial nanodrug carriers(dextran,liposomal,polyethylene glycol(PEG)-coated gold,and magnetic)and conventional doxorubicin are evaluated in the tumor.The governing fluid flow and solute transport equation along with the specified boundary conditions are solved using the finite element method through the Galerkin approach.Results:Simulations show that IFP peaks in the necrotic core and sharply declines at the viable–healthy tissue interface.Both fluid pressure and velocity are sensitive when fluid flow resistance drops below 5.Necrotic core size influences IFP,and critical necrotic radius(RCN)marks pressure stabilization and defines the threshold for effective nanodrug delivery.Vascular normalization and functional lymphatic dynamics show marginal impact.Smaller NPs(~10 nm)diffuse faster but undergo rapid degradation,while larger particles(>30 nm)exhibit prolonged retention at the injection site.Liposomal,PEG-coated gold,and magnetic variants demonstrate superior therapeutic action compared to conventional doxorubicin.Conclusion:The findings of the study highlight its strong potential for optimizing nanodrug delivery and design,as well as hyperthermia treatment,enhancing personalized cancer therapy. 展开更多
关键词 nanodrug transport solid tumorincorporating enhancing mechanistic understanding interstitial fluid flow solid tumorintroduction cancer mathematical model intratumoral injection mechanismsimpact finite element simulations
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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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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 被引量：1
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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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A New Three-Dimensional Voronoi Cell Finite Element Method for Particle-Reinforced Composites 认领 引用 被引量：1
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作者 Huici Dong Ran Guo 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第1期90-100,共11页
This paper proposes a state-of-the-art three-dimensional Voronoi cell finite element method(3D VCFEM)aimed at investigating the mechanical properties of particle-reinforced composites(PRCs)in space under different mic... This paper proposes a state-of-the-art three-dimensional Voronoi cell finite element method(3D VCFEM)aimed at investigating the mechanical properties of particle-reinforced composites(PRCs)in space under different microstructural properties.Firstly,the modified residual energy generalized function of 3D VCFEM was proposed by applying the hybrid stress element method,and the element format of the 3D Voronoi element was constructed.On this basis,the interaction between the matrix and the inclusions was considered,and the higher-order stress function including the interaction stress term was constructed.Secondly,to solve the difficulty of integrating easily due to the complexity and irregularity of the integration region in space,Delaunay tetrahedra were introduced within the 3D Voronoi element for mesh refinement.It simplified the integration process.Finally,to verify the accuracy and efficiency of the 3D VCFEM model,comparative models of 3D VCFENM and FEM were established for analysis and discussion.The stress field and strain field were compared and analyzed for the first time.An example was also given for the presence of a large number of randomly distributed inclusion particles.The results showed that under the same accuracy,3D VCFEM had the advantages of convenient mesh delineation and high computational efficiency compared with FEM,which provided a new way of thinking to analyze the actual PCRs. 展开更多
关键词 Three-dimensional Voronoi cell finite element method Particle-reinforced composites Integral domain refinement Hybrid stress element method
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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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Study on Hybrid Stress Finite Elements of 3D Arbitrary Polyhedral Considering Gravity 认领 引用
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作者 Runjie Wang Ran Guo Chang Liu 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第5期585-595,共11页
This study proposes a novel gravity-considered three-dimensional arbitrary polyhedral hybrid stress finite element method(abbreviated as G-3DPHSEM)for numerical simulation of three-dimensional problems considering gra... This study proposes a novel gravity-considered three-dimensional arbitrary polyhedral hybrid stress finite element method(abbreviated as G-3DPHSEM)for numerical simulation of three-dimensional problems considering gravity effects.Based on the hybrid stress finite element theory,this study integrates gravity terms into the modified complementary energy functional of hybrid stress finite element,and proposes the functional of G-3DPHSEM.To verify the effectiveness of the method,a single-material model example,a multi-material model example,and a complex model example were constructed for numerical simulation.The calculation results of G-3DPHSEM were compared with those of the commercial finite element software.The comparison results show that:for the single-material case,the errors of this method are generally below 3%compared with commercial software’s results;for the multi-material case,the errors are generally below 5%compared with commercial software’s results;for the complex model,the errors are generally below 10%compared with commercial software’s results.Meanwhile,this method also demonstrates significant advantages in mesh generation:while ensuring computational accuracy,it possesses the core advantages of flexible mesh generation and substantial reduction in the number of elements,providing new ideas for numerical simulation of complex gravity problems(such as large and complex slopes and other engineering problems). 展开更多
关键词 G-3DPHSEM Gravity Arbitrary polyhedral hybrid stress finite element Numerical simulation
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