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3-D Numerical Simulation on the Chip Machining Process of a Metal Block 被引量:2
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作者 Yan Yixia Yin Yihui Li Weifen 《上海交通大学学报》 EI CAS CSCD 北大核心 2004年第z2期108-113,共6页
In this paper, the cutting process of a metal block is numerically simulated by the dynamic explicit FE code ABAQUS. Taking thermo-mechanical coupling effect into consideration, the simulation presents the variation o... In this paper, the cutting process of a metal block is numerically simulated by the dynamic explicit FE code ABAQUS. Taking thermo-mechanical coupling effect into consideration, the simulation presents the variation of temperature, stress and strain distribution in the workpiece and chip. The effective plastic strain failure criterion is applied to modeling the chip separation and plastic formation. And the phenomenon of the contact and friction between the workpiece and the cutting tool are described in the paper. 展开更多
关键词 CUTTING 3-d fem THERMO-MECHANICAL coupling
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ANALYSIS OF SLAB EDGING BY A 3-D RIGID VISCO-PLASTIC FINITE ELEMENT METHOD 被引量:1
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作者 Zhang Xiaoming Jiang Zhengyi Liu Xianghua Wang Guodong State Key Laboratory of Rolling Technology and Automation,Northeastern University, Shenyang 110006,China 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2002年第1期48-52,共5页
3-D rigid visco-plastic finite element method (FEM) is used in the analysisof metal forming processes, including strip and plate rolling, shape rolling, slab edging, specialstrip rolling. The shifted incomplete Choles... 3-D rigid visco-plastic finite element method (FEM) is used in the analysisof metal forming processes, including strip and plate rolling, shape rolling, slab edging, specialstrip rolling. The shifted incomplete Cholesky decomposition of the stiffness matrix with thesolution of the equations for velocity increment by the conjugate gradient method is combined. Thistechnique, termed the shifted ICCG method, is then employed to solve the slab edging problem. Theperformance of this algorithm in terms of the number of iterations, friction variation, shiftedparameter psi and the results of simulation for processing parameters are analysed. Numerical testsand application of this technique verify the efficiency and stability of the shifted ICCG method inthe analysis of slab edging. 展开更多
关键词 3-d rigid visco-plastic fem Shifted ICCG method Slab edging Frictionvariation
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Characteristics of an Axial-flux Permanent Magnet Synchronous Machine with Contra-rotating Rotors under Unbalanced Load Condition from 3-D Finite Element Analysis 被引量:1
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作者 Yichang Zhong Shoudao Huang +1 位作者 Derong Luo Xuan Wu 《CES Transactions on Electrical Machines and Systems》 2018年第2期220-225,共6页
During recent years,the axial-flus PMSM with contra-rotating rotors has become a hot topic in academic research due to its high efficiency and simple structure.However,its back-EMF may be distorted under the condition... During recent years,the axial-flus PMSM with contra-rotating rotors has become a hot topic in academic research due to its high efficiency and simple structure.However,its back-EMF may be distorted under the condition of different angular positions.This paper investigates characteristics of the novel motor used for contra-propeller driving.Considering the torque ripple and current oscillation under unbalanced load condition,this paper analyzes the distorted back-EMF of the machine when its two rotors get different angular positions during rotating.The analysis results are validated by transient-magnetic 3-D FEA method,which the 3-D FEA software is used to model this motor and transient simulations are carried out to obtain its magnetic characteristic and main performances.A main focus is put on the back-EMF characteristic with different angular positions between the two rotors.Furthermore,the characteristic of torque production under unbalanced load is investigated.Finally,a prototype motor is fabricated to validate the analyses of this paper. 展开更多
关键词 3-d finite element analysis(fem) back electromagnetic force(back-EMF) contra-rotating rotors permanent magnet machines.
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A 3D Numerical Simulation of Sand Drain Element in the Soft Soil of Guangzhou-Zhujiang Highway,China
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作者 W.O.Balogun G.Habiyaremye 《地学前缘》 EI CAS CSCD 北大核心 2009年第S1期240-240,共1页
The behavior of sand drain was estimated so that the size of very large load-pressure could be eliminated by changing the configuration of the sand drain elements into sand wall.A 3D mathematical model was formulated ... The behavior of sand drain was estimated so that the size of very large load-pressure could be eliminated by changing the configuration of the sand drain elements into sand wall.A 3D mathematical model was formulated to transform the configuration of a sand drain into a sand wall to minimize or eliminate the excessive stress and primary settlement on the road base.This was barely considered in the past. According to soil mechanics theory and seepage characteristics of sand drain in road base foundations, a 3D sand drain element in FEM format was generated,and a matrix expression was formulated which was introduced into 3D Biot Consolidation 展开更多
关键词 SAND DRAIN ELEMENT 3D biot fem soft soil FOUNDATION Abaqus Guangzhou-Zhujiang
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基于现场调查及三维非线性FEM分析的钢框架结构安全性评价研究
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作者 杜世开 新井泰 《建筑施工》 2016年第5期661-665,共5页
作为日本最古老的地铁线路,东京地铁银座线采用钢框架结构形式至今已安全运营了将近90年。通过对该隧道结构体建立的三维FEM模型,非线性分析了静载作用下结构体的应力、应变分布特性。再以对比分析模型分析与现场实际调查两方面得出的... 作为日本最古老的地铁线路,东京地铁银座线采用钢框架结构形式至今已安全运营了将近90年。通过对该隧道结构体建立的三维FEM模型,非线性分析了静载作用下结构体的应力、应变分布特性。再以对比分析模型分析与现场实际调查两方面得出的裂缝位置及裂缝应变大小,验证了分析方法的合理性与适用性;然后采用该分析方法对隧道结构体的安全性进行评价分析,分析结果显示结构目前依然具备足够的安全性能。 展开更多
关键词 东京地铁银座线 钢框架结构 现场调查 非线性分析 3-d fem 安全评价
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真空-堆载预压处理高速公路软基的有限元计算 被引量:36
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作者 刘汉龙 彭吉力 +1 位作者 陈永辉 郑绍君 《岩土力学》 EI CAS CSCD 北大核心 2003年第6期1029-1033,共5页
根据高速公路路基的变形特点,提出了真空-堆载联合预压法处理软基的三维Biot固结有限元计算模型,将砂井按照实际尺寸划分单元,避免了平面计算方法中的砂井处理的问题,较以往的平面数值方法更接近实际情况。结合修正剑桥模型,对某真空-... 根据高速公路路基的变形特点,提出了真空-堆载联合预压法处理软基的三维Biot固结有限元计算模型,将砂井按照实际尺寸划分单元,避免了平面计算方法中的砂井处理的问题,较以往的平面数值方法更接近实际情况。结合修正剑桥模型,对某真空-堆载联合预压试验段进行了计算、分析,结果令人满意。 展开更多
关键词 高速公路 软基处理 biot固结 三维有限元计算 真空—堆载联合预压法 路基变形
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真空-堆载联合预压软基中PVD单元的构造及应用 被引量:2
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作者 彭劼 刘汉龙 《河海大学学报(自然科学版)》 CAS CSCD 北大核心 2005年第6期663-667,共5页
根据真空-堆载联合预压软基中塑料排水板的作用特点,提出了PVD单元的概念以及有限元格式、矩阵表达式,并将其结合到三维Biot固结有限元程序中.对真空-堆载联合预压计算例题,用PVD单元有限元法、常规有限元法进行了计算、比较,结果表明PV... 根据真空-堆载联合预压软基中塑料排水板的作用特点,提出了PVD单元的概念以及有限元格式、矩阵表达式,并将其结合到三维Biot固结有限元程序中.对真空-堆载联合预压计算例题,用PVD单元有限元法、常规有限元法进行了计算、比较,结果表明PVD单元有限元法能较好地模拟塑料排水板在真空-堆载联合预压地基中的应用. 展开更多
关键词 塑料排水板 PVD单元 三维biot有限元
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Full 3-D numerical modeling of borehole electric image logging and the evaluation model of fracture 被引量:3
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作者 KE ShiZhen Resource & Information Collage of Chinese Petroleum University,Beijing 102249,China 《Science China Earth Sciences》 SCIE EI CAS 2008年第S2期170-173,共4页
A full 3-D finite element method numerical modeling program is written based on the principle and technical specification of borehole electric image well logging tool. The response of well logging is computed in the f... A full 3-D finite element method numerical modeling program is written based on the principle and technical specification of borehole electric image well logging tool. The response of well logging is computed in the formation media model with a single fracture. The effect of changing fracture aperture and resistivity ratio to the logging response is discussed. The identification ability for two parallel fractures is also present. A quantitative evaluation formula of fracture aperture from borehole electric image logging data is set up. A case study of the model well is done to verify the accuracy of the for-mula. The result indicates that the formula is more accurate than the foreign one. 展开更多
关键词 NUMERICAL modeling BOREHOLE electric image LOGGING 3-d fem full SCOPE FRACTURE
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Thermo-mechanical and Experimental Analysis of Double Pass Line Heating
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作者 Pankaj Biswas N. R. Mandal +1 位作者 O. P. Sha M. M. Mahapatra 《Journal of Marine Science and Application》 2011年第2期190-198,共9页
The present investigation deals with process analysis of oxy-acetylene flame assisted double pass line heating for varying plate thickness, oxy-acetylene flame as the heat source for multi pass line heating to achieve... The present investigation deals with process analysis of oxy-acetylene flame assisted double pass line heating for varying plate thickness, oxy-acetylene flame as the heat source for multi pass line heating to achieve 3-D bending of plates with varying thicknesses was studied. The oxy-acetylene flame was modeled as the moving heat source in the FEM analysis. The transient thermal histories were predicted taking into account the temperature dependent thermo-mechanical properties. A comparative study between single pass and double pass line heating residual deformation was also carried out. The temperature distribution and residual detbrmations predicted by the numerical model developed in the present work compared fairly well with those of the experimental ones. 展开更多
关键词 double pass thermal history residual defolxnations 3-d fem transient analysis elasto-plastic analysis oxy-acetylene gas torch
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