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Three-Dimensional Phase Field Simulations of Hysteresis and Butterfly Loops by the Finite Volume Method
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作者 席丽莹 陈焕铭 +3 位作者 郑富 高华 童洋 马治 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第9期128-131,共4页
Three-dimensional simulations of ferroelectric hysteresis and butterfly loops are carried out based on solving the time dependent Ginzburg-Landau equations using a finite volume method. The influence of externally mec... Three-dimensional simulations of ferroelectric hysteresis and butterfly loops are carried out based on solving the time dependent Ginzburg-Landau equations using a finite volume method. The influence of externally mechanical loadings with a tensile strain and a compressive strain on the hysteresis and butterfly loops is studied numerically. Different from the traditional finite element and finite difference methods, the finite volume method is applicable to simulate the ferroelectric phase transitions and properties of ferroelectric materials even for more realistic and physical problems. 展开更多
关键词 Three-Dimensional Phase Field Simulations of Hysteresis and Butterfly Loops by the finite volume Method
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Application of the Finite Element Method in the Glass Fiber Bushing Research 被引量:1
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作者 CHEN Song LU Jiansheng +4 位作者 GUAN Weiming ZHANG Kunhua PAN Yong TAN Zhilong XIA Lu 《贵金属》 CAS CSCD 北大核心 2012年第A01期59-65,共7页
Design and optimization of bushing at present mainly use the traditional experience method.The relevant research that adopts computer simulation to carry on the operation behavior of the bushing has appeared in recent... Design and optimization of bushing at present mainly use the traditional experience method.The relevant research that adopts computer simulation to carry on the operation behavior of the bushing has appeared in recent years.How to use the finite element method to research bushing was introduced in the article.Physics fields and many relevant parameters of one real bushing were calculated.Through the results of calculation,it indicate that the finite element method is very useful in bushing research of designing and optimizing. 展开更多
关键词 BUSHING the finite element glass fiber SIMULATION DESIGN optimize CREEP
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THE FINITE ELEMENT METHODS FOR A CLASS OF NONLINEAR PARABOLIC EQUATIONS 被引量:1
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作者 刘小华 《Numerical Mathematics A Journal of Chinese Universities(English Series)》 SCIE 2001年第1期59-69,共11页
Error estimates are established for the finite element methods to solve a class of second order nonlinear parabolic equations. Optimal rates of convergence in L 2 and H 1 norms are derived.Meanwhile,the schemes are se... Error estimates are established for the finite element methods to solve a class of second order nonlinear parabolic equations. Optimal rates of convergence in L 2 and H 1 norms are derived.Meanwhile,the schemes are second order correct in time. 展开更多
关键词 the finite element parabolic equations error estimate.
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Multifractal Decomposition of Generalized Digraph Recursive Sets with the Finite Intersection Property
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作者 郭红文 《Chinese Quarterly Journal of Mathematics》 CSCD 2000年第4期91-97,共7页
By using measures of Markov type, we proved that under the finite intersection property, multifractal decomposition still hold for a large class of recursive fractals which allow appropriate overlapping.
关键词 multifrcatal decomposition measures of Markov type the finite intrsection propex
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Cracking analysis of fracture mechanics by the finite element method of lines(FEMOL) 被引量:2
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作者 Shaowei Hu Brian Moran 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2005年第5期495-502,共8页
The Finite Element Method of Lines (FEMOL) is a semi-analytic approach and takes a position between FEM and analytic methods. First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to... The Finite Element Method of Lines (FEMOL) is a semi-analytic approach and takes a position between FEM and analytic methods. First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to a set of examples such as edge-crack plate, the central-crack plate, the plate with cracks emanating from a hole under tensile or under combination loads of tensile and bending. Their dimensionless stress distribution, the stress intensify factor (SIF) and crack opening displacement (COD) are obtained, and comparison with known solutions by other methods are reported. It is found that a good accuracy is achieved by FEMOL. The method is successfully modified to remarkably increase the accuracy and reduce convergence difficulties. So it is a very useful and new tool in studying fracture mechanics problems. 展开更多
关键词 the finite element method of lines (FEMOL) .Cracking analysis . Application
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THE FINITE SEMIGROUPS OF QUATERNIONS MATRICES
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作者 Wang Guodong Zhao Bo(Dept.of Math .,Yunnan University,Kunming 650091/Dept.of Computer Science,Yunnan Normal University,Kunming 650091,PRC) 《Numerical Mathematics A Journal of Chinese Universities(English Series)》 SCIE 2000年第S1期68-70,共3页
In this paper,we shall prove that for any positive interger n,there exists non-trivialcommutative finite semigroup of idempotent consisting of some n×n real quaternion matri-ces which is lower semilattice.In the ... In this paper,we shall prove that for any positive interger n,there exists non-trivialcommutative finite semigroup of idempotent consisting of some n×n real quaternion matri-ces which is lower semilattice.In the process of solving this problem we shall see thatmany properties of generalized inverses for complex matrices still hold for quaternions ma- 展开更多
关键词 PRC In the finite SEMIGROUPS OF QUATERNIONS MATRICES over REAL
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Determination of the Minimum Testing Time for Wireline Formation Testing with the Finite Element Method
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作者 Hu Falong Xiao Lizhi +1 位作者 Zhang Yuanzhong Wang Chengwei 《Petroleum Science》 SCIE CAS CSCD 2006年第1期39-44,共6页
The wireline formation tester (WFT) is an important tool for formation evaluation, such as calculating the formation pressure and permeability, identifying the fluid type, and determining the interface between oil a... The wireline formation tester (WFT) is an important tool for formation evaluation, such as calculating the formation pressure and permeability, identifying the fluid type, and determining the interface between oil and water. However, in a low porosity and low permeability formation, the supercharge pressure effect exists, since the mudcake has a poor sealing ability. The mudcake cannot isolate the hydrostatic pressure of the formation around the borehole and the mud seeps into the formations, leading to inaccurate formation pressure measurement. At the same time, the tool can be easily stuck in the low porosity/low permeability formation due to the long waiting and testing time. We present a method for determining the minimum testing time for the wireline formation tester. The pressure distribution of the mudcake and the formation were respectively calculated with the finite element method (FEM). The radius of the influence of mud pressure was also computed, and the minimum testing time in low porosity/low permeability formations was determined within a range of values for different formation permeabilities. The determination of the minimum testing time ensures an accurate formation pressure measurement and minimizes possible accidents due to long waiting and testing time. 展开更多
关键词 Wireline formation tester the minimum testing time the finite element method
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THE DYNAMIC STIFFNESS MATRIX OF THE FINITE ANNULAR PLATE ELEMENT
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作者 张益松 高德平 吴晓萍 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第12期1151-1162,共12页
The dynamic deformation of harmonic vibration is used as the shape functions of the finite annular plate element, and sonic integration difficulties related to the Bessel's functions are solved in this paper. Then... The dynamic deformation of harmonic vibration is used as the shape functions of the finite annular plate element, and sonic integration difficulties related to the Bessel's functions are solved in this paper. Then the dynamic stiffness matrix of the finite annular plate element is established in closed form and checked by the direct stiffness method. The paper has given wide convcrage for decomposing the dynamic matrix into the power series of frequency square. By utilizing the axial symmetry of annular elements, the modes with different numbers of nodal diameters at s separately treated. Thus some terse and complete results are obtained as the foundation of structural characteristic analysis and dynamic response compulation. 展开更多
关键词 DE the DYNAMIC STIFFNESS MATRIX OF the finite ANNULAR PLATE ELEMENT PING
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THE EXISTENCE AND UNIQUENESS OF THE SCREW TENSOR FOR THE FINITE DISPLACEMENT OF A RIGIDBODY
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作者 余燊 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1984年第3期1325-1332,共8页
The existence and uniqueness theorem of the screw tensor for the finite displacement of a rigidbody is proposed and then proved using the screw calculus. As a conseguence, formulae are obtained for determining the scr... The existence and uniqueness theorem of the screw tensor for the finite displacement of a rigidbody is proposed and then proved using the screw calculus. As a conseguence, formulae are obtained for determining the screw tensor in terms of the finite displacement data of the rigidbody. 展开更多
关键词 SCT the EXISTENCE AND UNIQUENESS OF the SCREW TENSOR FOR the finite DISPLACEMENT OF A RIGIDBODY
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The finite element analysis of articular cartilage fiber-reinforced composite model under rolling load
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作者 Qin Xiao-feng,Liu Hai-ying,Ye Jin-duo,Zhang Chun-qiu(School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384) 《医用生物力学》 EI CAS CSCD 2009年第S1期67-67,共1页
Articular cartilage is a layer of low-friction,load-bearing soft hydrated tissue covering bone-ends in diarthrosis,which plays an important role in spreading the load,reducing the joint contact stress,joint friction a... Articular cartilage is a layer of low-friction,load-bearing soft hydrated tissue covering bone-ends in diarthrosis,which plays an important role in spreading the load,reducing the joint contact stress,joint friction and wear during exercise.The vital mechanical function 展开更多
关键词 the finite element analysis of articular cartilage fiber-reinforced composite model under rolling load
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THE STABILITY AND CONVERGENCE OF THE FINITE ANALYTIC METHOD FOR THE NUMERICAL SOLUTION OF CONVECTIVE DIFFUSION EQUATION
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作者 孙毓平 吴江航 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第6期521-528,共8页
In this paper we make a close study of the finite analytic method by means of the maximum principles in differential equations and give the proof of the stability and convergence of the finite analytic method.
关键词 the STABILITY AND CONVERGENCE OF the finite ANALYTIC METHOD FOR the NUMERICAL SOLUTION OF CONVECTIVE DIFFUSION EQUATION
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The finite element analysis of cemented long and short stem prosthetic replacement in aged patients with comminuted intertrochanteric fracture
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作者 王韶进 《外科研究与新技术》 2011年第2期112-112,共1页
Objective To investigate the stress distribution of the femur after cemented prosthetic replacement in aged patients with comminuted intertrochanteric fracture and to analyze the difference of stress distribution betw... Objective To investigate the stress distribution of the femur after cemented prosthetic replacement in aged patients with comminuted intertrochanteric fracture and to analyze the difference of stress distribution between cemented long 展开更多
关键词 STEM the finite element analysis of cemented long and short stem prosthetic replacement in aged patients with comminuted intertrochanteric fracture
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Experimental and simulation research on hollow AZ31 magnesium alloy three-channel joint by hot extrusion forming with sand mandrel
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作者 Shi Shengnan Wang Hongyu +4 位作者 Teng Fei Jiang Lei Sun Juncai Sun Jie Zhang Shunhu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第1期98-109,共12页
Magnesium alloy is one of the lightest metal structural materials.The weight is further reduced through the hollow structure.However,the hollow structure is easily damaged during processing.In order to maintain the ho... Magnesium alloy is one of the lightest metal structural materials.The weight is further reduced through the hollow structure.However,the hollow structure is easily damaged during processing.In order to maintain the hollow structure and to transfer the stresses during the high temperature deformation,the sand mandrel is proposed.In this paper,the hollow AZ31 magnesium alloy three-channel joint is studied by hot extrusion forming.Sand as one of solid granule medium is used to fill the hollow magnesium alloy.The extrusion temperatures are 230℃ and 300℃,respectively.The process parameters(die angle,temperature,bottom thickness,sidewall thickness,edge-to-middle ratio in bottom,bottom shape)of the hollow magnesium alloy are analyzed based on the results of experiments and the finite element method.The results are shown that the formability of the hollow magnesium alloy will be much better when the ratio of sidewall thickness to the bottom thickness is 1:1.5.Also when edge-to-middle ratio in bottom is about 1:1.5,a better forming product can be received.The best bottom shape in these experiments will be convex based on the forming results.The grain will be refined obviously after the extrusion.Also the microstructures will be shown as streamlines.And these lines will be well agreement with the mold in the corner. 展开更多
关键词 AZ31 magnesium alloy Three-channel joint SAND Experiments and the finite element Die angle
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Design and Research on the Two-Joint Mating System of Underwater Vehicle
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作者 张忠林 王立权 《China Ocean Engineering》 SCIE EI CSCD 2013年第1期111-120,共10页
In the 21st century, people have come to the era of ocean science and ocean economy. With the development of ocean science and technology and the thorough research on the ocean, underwater mating technique has been wi... In the 21st century, people have come to the era of ocean science and ocean economy. With the development of ocean science and technology and the thorough research on the ocean, underwater mating technique has been widely used in such fields as sunk ship salvage, deep ocean workstation, submarine lifesaving aid and military affairs. In this paper, researches are made home and abroad on mating technology. Two-joint mating system of underwater vehicle is designed including plane system, three-dimensional assembly system and control system in order to increase the capacity of adapting platform obliquity and adopting rotational skirt scheme. It is clear that the system fits the working space of underwater vehicle passageway and there is no interference phenomenon in assembly design. The finite element model of the system shell and the pressurization of the joint are established. The results of the finite element computing and the pressing test are accordant, and thus it can testify that the shell material meet the need of intension and joint pressurization is reliable. Modeling of the control system is accomplished, and simulation and analysis are made, which can provide directions for the controller design of mating system of underwater vehicles. 展开更多
关键词 underwater vehicle rotational skirt mating system the finite element model CONTROLLER system simulation
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The May 23 and 24, 1994 Taiwan earth quakes: comparison of source process between the two events
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作者 何玉梅 郑天愉 艾印双 《Acta Seismologica Sinica(English Edition)》 CSCD 1999年第3期267-276,共10页
Inversion for the seismic fault rupture history is an important way to study the nature of the earthquake source. Inthis paper, we have selected two Taiwan earthquakes that occurred closely in time and located in the ... Inversion for the seismic fault rupture history is an important way to study the nature of the earthquake source. Inthis paper, we have selected two Taiwan earthquakes that occurred closely in time and located in the same region,inversed the distribution of the slip amplitudes, rakes, risetimes and the rupture times on the fault planes by usingGDSN broad-band and long-period records and the adaptive hybrid global search algorithm, and compared the twoevents. The slip rate of every subfault calculated provides information about the distribution of tectonic stress andfault strength. To the former event (Ms=6.0), the maximum slip amplitude 2.4 m and the minimum risetime 1.2 sare both located at the hypocentre. The latter earthquake (Ms=6.6) consisted of two subevents and the second source has 4 s delay. The maximum slip amplitUde 0.9 m located near hypocentre is corresponding to the minimumrisetime l.4 s, and the corresponding maximum slip rate 0.7 m.s~-1 is similar to the peak value of other large sliprate areas. We consider that the latter event has more complicated temporal-spatial distribution than the former. 展开更多
关键词 INVERSION the finite fault rupture history hybrid global search algorithm Taiwan earthquake
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Analysis on the Magnetic Shielding Effectiveness of DC Current Comparator
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作者 Jiayun Song Pan Pan +2 位作者 Qizheng Ji Shuqiang Wang Biye Liu 《Journal of Applied Mathematics and Physics》 2016年第2期478-486,共9页
There are magnetic interference problems in the applications of DC current comparator. Analysis on the magnetic effectiveness which is applied by the external magnetic field is introduced in this paper. The effectiven... There are magnetic interference problems in the applications of DC current comparator. Analysis on the magnetic effectiveness which is applied by the external magnetic field is introduced in this paper. The effectiveness is proved by the actual results which are compared with the magnetic- circuit method and the finite element method. In addition, the reference comment is given which can be used in the practical work of DC current comparator shield design. 展开更多
关键词 Magnetic Shielding Effectiveness DC Current Comparator the Magnetic-Circuit Method the finite Element Method
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THE PARTIAL PROJECTION METHOD IN THE FINITE ELEMENT DISCRETIZATION OF THE REISSNER-MINDLIN PLATE MODEL 被引量:7
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作者 Zhou Tian-kiao(Computing Technology Research Institute, CAE, Xi’an, China) 《Journal of Computational Mathematics》 SCIE CSCD 1995年第2期172-191,共20页
In the paper a linear combination of both the standard mixed formulation and the displacement one of the Reissner-Mindlin plate theory is used to enhance stability of the former and to remove ''locking'... In the paper a linear combination of both the standard mixed formulation and the displacement one of the Reissner-Mindlin plate theory is used to enhance stability of the former and to remove ''locking'' of the later. For this new stabilized formulation, a unified approach to convergence analysis is presented for a wide spectrum of finite element spaces. As long as the rotation space is appropriately enriched, the formulation is convergent for the finite element spaces of sufficiently high order. Optimal-order error estimates with constants independent of the plate thickness are proved for the various lower order methods of this kind. 展开更多
关键词 MATH the PARTIAL PROJECTION METHOD IN the finite ELEMENT DISCRETIZATION OF the REISSNER-MINDLIN PLATE MODEL
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Feature analysis of acoustic emission sources for rail crack detection by the finite element method 被引量:3
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作者 ZHANG Xin FENG Naizhang +1 位作者 WANG Yan SHEN Yi 《Chinese Journal of Acoustics》 CSCD 2015年第3期203-215,共13页
The safety of rail is very important for the development of high speed railway, and it is necessary to investigate the features of inner cracks in rail. In order to obtain the features of Acoustic Emission (AE) sour... The safety of rail is very important for the development of high speed railway, and it is necessary to investigate the features of inner cracks in rail. In order to obtain the features of Acoustic Emission (AE) sources of inner cracks in rail, AE sources with different types, depths and propagation distances are examined for crack in rail. The finite element method is utilized to model the rail with cracks and the results of experiment demonstrate the effectiveness of this model. Wavelet transform and Rayleigh-Lamb equations are utilized to extract the features of crack AE sources. The results illustrate that the intensity ratio among AE modes can identify the AE source types and the AE sources with different frequencies in rail. There are uniform AE mode features existing in the AE signals from AE sources in rail web, however AE signals from AE sources in rail head and rail base have the complex and unstable AE modes. Different AE source types have the different propagation features in rail. It is helpful to understand the rail cracks and detect the rail cracks based on the AE technique. 展开更多
关键词 Feature analysis of acoustic emission sources for rail crack detection by the finite element method MODE
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ANALYSIS OF INTER-LAMINAR STRESSES FOR COMPOSITE LAMINATED PLATE WITH INTERFACIAL DAMAGE 被引量:1
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作者 Yiming Fu Sheng Li Yejie Jiang 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第2期127-140,共14页
A constitutive model for composite laminated plates with the damage effect of the intra-layers and inter-laminar interface is presented. The model is based on the general six-degrees-of-freedom plate theory, the disco... A constitutive model for composite laminated plates with the damage effect of the intra-layers and inter-laminar interface is presented. The model is based on the general six-degrees-of-freedom plate theory, the discontinuity of displacement on the interfaces are depicted by three shape functions, which are formulated according to solutions satisfying three equilibrium equations, By using the variation principle, the three-dimensional non-linear equilibrium differential equations of the laminated plates with two different damage models are derived. Then, considering a simply supported laminated plate with damage, an analytical solution is presented using finite difference method to obtain the inter-laminar stresses. 展开更多
关键词 composite laminated plates geometric nonlinearity inter-laminar stress analysis interracial damage the finite difference method
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A NEW METHOD FOR SOLUTION OF 3D ELASTIC-PLASTIC FRICTIONAL CONTACT PROBLEMS
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作者 张洪武 钟万勰 顾元宪 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2001年第7期756-765,共10页
The solution of 3 D elastic-plastic frictional contact problems belongs to the un specified boundary problems where the interaction between two kinds of nonlinearities should occur. Considering the difficulties for th... The solution of 3 D elastic-plastic frictional contact problems belongs to the un specified boundary problems where the interaction between two kinds of nonlinearities should occur. Considering the difficulties for the solution of 3 D frictional contact problems, the key part is the determination of the tangential slip states at the contact points, and a great amount of computing work is needed for a high accuracy result. A new method based on a combination of programming and iteration methods, which are respectively known as two main kinds of methods for contact analysis, was put forward to deal with 3 D elastic-plastic contact problems. Numerical results demonstrate the efficiency of the algorithm illustrated here. 展开更多
关键词 3D frictional contact ELASTO-PLASTICITY programming method iteration method the finite element method
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