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finite element modeling of consolidation process of Si C fiber-reinforced titanium matrix composites via matrix-coated fiber method

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Rare Metals 2015年第12期34卷 844-850页

作者： Xiang-Hong Xu Yan-Qing Yang Xian Luo Lin Qin Ju-Hong Lou Qing Sun Shazhou Polytechnic Institute of Technology State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The consolidation process of SiCf/Ti-6Al-4V composites by matrix-coated fiber (MCF) method via hot pressing was investigated using finite element modeling (FEM). By analyzing the elastic–plastic contact deformation of the representative aligned coated fibers, the consolidation maps delineating the time–temperature–pressure relationship for full densification were constructed. Both the flow coefficient and the contact area coefficient used to describe the contact deformation were calculated according to the model. In addition, the effect of fiber content on matrix stress distribution was analyzed. The results show that fiber content is a significant factor that influences the densification process. Higher fiber content will lower the consolidation rate.

关键词： Titanium matrix composites Consolidation finite element modeling Matrix-coated fiber

finite element modeling of Hydrostatic Stress Distribution in Copper Dual-damascene Interconnects

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Journal of Shanghai Jiaotong university(Science) 2011年第3期16卷 302-306页

作者：袁光杰陈冷 School of Materials Science and Engineering University of Science and Technology Beijing

Hydrostatic stresses of copper dual-damascene interconnects are calculated by a commercial finite element software in this *** analytical work is performed to examine the effects of different low-k(k is permittivity)dielectrics,barrier layer and aspect ratio of via on hydrostatic stress distribution in the copper *** results of calculation indicate that the hydrostatic stresses are highly non-uniform throughout the copper interconnects and the highest tensile hydrostatic stress exists on the top interface of lower level interconnect near *** the high coefficient of thermal expansion and the low elastic modulus of the low-k dielectrics and barrier layer can decrease the highest hydrostatic stress on the top interface,which can improve the reliability of the copper interconnects.

关键词： copper dual-damascene interconnects hydrostatic stress stress-induced voiding finite element modeling

finite element modeling of pore-fluid flow in the Dachang ore district,Guangxi,China:Implications for hydrothermal mineralization

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Geoscience Frontiers 2011年第3期2卷 463-474页

作者： Minghui Ju Chongbin Zhao Tagen Dai Jianwen Yang Computational Geosciences Research Center Central South University Changsha 410083 China The Key Laboratory of Chinese Education Ministry for Non-ferrous Metal Metallogenic Prediction Central South University Changsha 410083 China Department of Earth and Environmental Sciences University of Windsor Canada

Convective heat transfer associated with the circulation of porefluid in porous rocks and fractures within the upper crust of the Earth is substantial when the temperature gradient is sufficiently high. In order to understand the process of Snpolymetallic mineralization in the Dachang ore district of Guangxi, a finite element method has been used in this study to simulate both pore-fluid flow and heat transfer in this district. On the basis of related geological, tectonic and geophysical constraints, a computational model was established. It enables a computational simulation and sensitivity analysis to be carried out for investigating ore-forming pore-fluid flow and other key factors that may affect hydrothermal ore genesis in the district. The related simulation results have indicated that：（1） permeable fault zones in the Dacbang ore district can serve as preferential pathways for pore-fluid flow on a regional-scale; and （2） the pore-fluid flow can affect the salinity distribution. This latter factor is part of the reason why Sn-polymetallic mineralization has taken place in this district.

关键词： finite element modeling Dachang ore district Hydrothermalmineralization Salinity-induced buoyancy

finite element modeling and experiment for behavior estimation of AlMn0.5Mg0.5 sheet during electromagnetic forming

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Transactions of Nonferrous Metals Society of China 2015年第7期25卷 2331-2341页

作者： Dorin LUCA Department of Technologies and Equipments for Materials Processing Technical University of Iasi

The electromagnetic forming is a procedure of high-speed processing,which favors the increase of the formability of some plastically deformed *** order to evaluate the capacity of some light metals,such as aluminum and its alloys,to be deformed through this procedure,it is useful to know the stress and strain state that occurs in the material during *** this work,the modeling of stresses and strains in electromagnetically deformed AlMn0.5Mg0.5 sheet was *** modeling was achieved using the finite element method and it was verified through experimental *** determine the residual stresses,the X-ray diffraction method was *** strains were established by measuring the displacements of the nodes in the network inscribed on the specimen by means of three coordinates measuring machine.A good agreement between the modeling results and experimental data was found.

关键词： finite element modeling electromagnetic forming AlMn0.5Mg0.5 sheet X-ray diffraction stress strain

Temperature-dependent thermal conductivity and fuel performance of UN-UO_(2) and UN-X-UO_(2)(X=Mo,W)composite nuclear fuels by finite element modeling

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Journal of Materiomics 2024年第4期10卷 937-946页

作者： Faris Sweidan Diogo Ribeiro Costa Huan Liu Pär Olsson KTH Royal Institute of Technology Nuclear EngineeringStockholm10691Sweden Westinghouse Electric Sweden AB Västerås72163Sweden

The temperature-dependent effective thermal conductivity of UN-X-UO_(2)(X=Mo,W)nuclear fuel composite was *** the experimental design,the thermal conductivity was calculated using finite element modeling(FEM),and compared with analytical models for 10%,30%,50%,and 70%(in mass)uncoated/coated UN microspheres in a UO_(2) *** FEM results show an increase in the fuel thermal conductivity as the mass fraction of the UN microspheres increases from 1.2 to 4.6 times the UO_(2) reference at 2,000 *** results from analytical models agree with the thermal conductivity estimated by *** results also show that Mo and W coatings have similar thermal behaviors,and the coating thickness influences the thermal conductivity of the *** higher weight fractions,the thermal conductivity of the fuel composite at room temperature is substantially influenced by the high thermal conductivity coatings approaching that of ***,the thermal conductivity from FEM was used in the fuel thermal performance evaluation during LWR normal operation to calculate the maximum centerline *** results show a significant decrease in the fuel maximum centerline temperature ranging from−94 K for 10% UN to−414 K for 70%(in mass)UN compared to UO_(2) under the same operating conditions.

关键词： Accident tolerant fuel UN-X-UO_(2) Composite nuclear fuel Thermal conductivity finite element modeling Thermal performance

A 3D finite element modeling on the relationship between crustal stress and earthquake activity in Liaoning and its vicinity

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Acta Seismologica Sinica(English Edition) 2001年第1期14卷 25-37,117页

作者：李平卢良玉卢造勋潘科焦明若许忠淮 1. Institute of Geophysics China Seismological Bureau 100081 Beijing China 2. Seismological Bureau of Liaoning Province 110031 Shenyang China

Based on the latest result in research on 3D seismic wave velocity structure of crust and uppermost mantle and taking geological setting and fracture zones into consideration, a 3D geological model for the studied region is built up. The boundary constraint and force loading boundary condition for the model are determined according to the characteristics of crustal stress field deduced from earthquake focal mechanism and in-situ stress measurement data. Using linear elastic material model a 3D finite element modeling is conducted to study the characteristics of crustal stress field. A comparison analysis between the simulated stress field and earthquake locations reveals that the moderate and strong earthquakes generally occurred in the zones with high shear stress gradient. Furthermore, the paper notices a few potential earthquake-prone regions.

关键词： Liaoning and its vicinity tectonic stress field finite element modeling

In silico optimization of actuation performance in dielectric elastomercomposites via integrated finite element modeling and deep learning

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Theoretical & Applied Mechanics Letters 2024年第1期14卷 48-56页

作者： Jiaxuan Ma Sheng Sun Materials Genome Institute Shanghai UniversityShanghai 200444China Zhejiang Laboratory Hangzhou 311100China Shanghai Frontier Science Center of Mechanoinformatics Shanghai UniversityShanghai 200444China

Dielectric elastomers(DEs)require balanced electric actuation performance and mechanical integrity under applied *** high dielectric particles as fillers provides extensive design space to optimize concentration,morphology,and distribution for improved actuation performance and material *** study presents an integrated framework combining finite element modeling(FEM)and deep learning to optimize the microstructure of DE *** first calculates actuation performance and the effective modulus across varied filler combinations,with these data used to train a convolutional neural network(CNN).Integrating the CNN into a multi-objective genetic algorithm generates designs with enhanced actuation performance and material modulus compared to the conventional optimization approach based on FEM approach within the same *** framework harnesses artificial intelligence to navigate vast design possibilities,enabling optimized microstructures for high-performance DE composites.

关键词： Dielectric elastomer composites Multi-objective optimization finite element modeling Convolutional neural network

An ultrasound-guided percutaneous electrical nerve stimulation regimen devised using finite element modeling promotes functional recovery after median nerve transection

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Neural Regeneration Research 2023年第3期18卷 683-688页

作者： Xiao-Lei Chu Xi-Zi Song Yu-Ru Li Zi-Ren Wu Qi Li Qing-Wen Li Xiao-Song Gu Dong Ming Department of Rehabilitation Tianjin University Tianjin HospitalTianjinChina Academy of Medical Engineering and Translational Medicine Tianjin UniversityTianjinChina College of Exercise&Health Science Tianjin University of SportTianjinChina College of Precision Instruments and Optoelectronics Engineering Tianjin UniversityTianjinChina

Percutaneous electrical nerve stimulation of an injured nerve can promote and accelerate peripheral nerve regeneration and improve *** performing acupuncture and moxibustion,locating the injured nerve using ultrasound before percutaneous nerve stimulation can help prevent further injury to an already injured ***,stimulation parameters have not been *** this study,we constructed a multi-layer human forearm model using finite element *** current density and activated function as optimization indicators,the optimal percutaneous nerve stimulation parameters were *** optimal parameters were parallel placement located 3 cm apart with the injury site at the midpoint between the *** validate the efficacy of this regimen,we performed a randomized controlled trial in 23 patients with median nerve transection who underwent *** who received conventional rehabilitation combined with percutaneous electrical nerve stimulation experienced greater improvement in sensory function,motor function,and grip strength than those who received conventional rehabilitation combined with transcutaneous electrical nerve *** findings suggest that the percutaneous electrical nerve stimulation regimen established in this study can improve global median nerve function in patients with median nerve transection.

关键词： finite element modeling median nerve transection nerve regeneration neurorehabilitation percutaneous electrical nerve stimulation peripheral nerve injury randomized controlled trial

Determination of the Normal Contact Stiffness and Integration Time Step for the finite element modeling of Bristle-Surface Interaction

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Computers, Materials & Continua 2018年第7期56卷 169-184页

作者： Libardo V.Vanegas-Useche Magd M.Abdel-Wahab Graham A.Parker Facultad de Ingeniería Mecánica Universidad Tecnológica de Pereira.Pereira 660003Colombia Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium Faculty of Engineering and Physical Sciences University of Surrey.GuildfordUK

In finite element modeling of impact,it is necessary to define appropriate values of the normal contact stiffness,Kn,and the Integration Time Step(ITS).Because impacts are usually of very short duration,very small ITSs are ***,the selection of a suitable value of Kn is a critical issue,as the impact behavior depends dramatically on this *** this work,a number of experimental tests and finite element analyses have been performed in order to obtain an appropriate value of Kn for the interaction between a bristle of a gutter brush for road sweeping and a concrete ***,a suitable ITS is *** experiments consist of releasing a steel bristle that is placed vertically at a certain distance from a concrete surface and tracking the ***,in the finite element analyses,a beam is modeled in free fall and impacting a surface;contact and target elements are attached to the beam and the surface,*** results of the experiments and the modeling are integrated through the principle of conservation of energy,the principle of linear impulse and momentum,and Newton’s second *** results demonstrate that,for the case studied,Kn and the impact time tend to be independent of the velocity just before impact and that Kn has a very large variation,as concrete is a composite material with a rough ***,the ratio between the largest height of the bristle after impact and the initial height tends to be constant.

关键词： Brush street sweeping finite element modeling contact mechanics