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THE IMPACT TORSIONAL BUCKLING FOR THE RIGID PLASTIC CYLINDRICAL SHELL
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作者 王德禹 张善元 杨桂通 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1993年第8期693-698,共6页
By using the energy criterion in [3], the impact torsional buckling for the rigid plastic cylindrical shell is studied. The linear dynamic torsional buckling equations for the rigid plastic shell is drived, and the cr... By using the energy criterion in [3], the impact torsional buckling for the rigid plastic cylindrical shell is studied. The linear dynamic torsional buckling equations for the rigid plastic shell is drived, and the critical impact velocity is given. 展开更多
关键词 dynamic plastic buckling energy criterion rigid plastic material cylindrical shell
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RIGID-PLASTIC/RIGID-VISCOPLASTIC FEM BASED ON LINEAR PROGRAMMING—THEORETICAL MODELING AND APPLICATION FOR AXISYMMETRICAL PROBLEMS 被引量:1
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作者 Xu Weili Shi Xiangchen Lin Zhongqin School of Mechanical Engineering,Shanghai Jiaotong University Peter Thomson Di Senglin Australia Monash University Australia University of Technology 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第2期184-188,共5页
Compared with the traditional rigid plastic/rigid viscoplastic(RP/RVP) FEM(based on iteration solution),RP/RVP FEM based on linear programming (LP) has some remarkable advantages,such as it's free of convergence... Compared with the traditional rigid plastic/rigid viscoplastic(RP/RVP) FEM(based on iteration solution),RP/RVP FEM based on linear programming (LP) has some remarkable advantages,such as it's free of convergence problem and its convenience in contact,rigid zone,and friction force treatment.The numerical model of RP/RVP FEM based on LP for axisymmetrical metal forming simulation is studied,and some related key factors and its treatment methods in formulation of constraint condition are proposed.Some solution examples are provided to validate its accuracy and efficiency. 展开更多
关键词 rigid plastic/rigid VISCOplastic FEM Contact treatment Linear programming
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EFFECT OF WALL SLIP ON SQUEEZE FLOW OF RIGID-PLASTIC MEDIA BETWEEN PARALLEL DISK 被引量:1
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作者 XuChumhui HungWenbin XuYong 《Acta Mechanica Solida Sinica》 SCIE EI 2005年第1期83-87,共5页
The squeeze flow of a rigid-plastic medium between parallel disks is considered for small gaps with partial wall slip. The stress distribution and the squeeze force between parallel disks of a rigid-plastic medium wit... The squeeze flow of a rigid-plastic medium between parallel disks is considered for small gaps with partial wall slip. The stress distribution and the squeeze force between parallel disks of a rigid-plastic medium with the following four diferent slip boundary conditions are obtained. (1) The Coulombic friction condition is applied, and the stress distribution on the wall is derived, which is linear or exponential distribution in the no-slip area or slip area. (2) It is assumed that the slip velocity at the disks increases linearly with the radius up to the rim slip velocity, with the stress distribution and the squeeze force gained. (3) The assumption that the slip velocity at the disks is related to the shear stress component is used, with the stress distribution and the squeeze force obtained, which is equivalent to the result given in (2). (4) Rational velocity components are introduced, and the stress distribution is satisfed. 展开更多
关键词 squeeze fow SLIP rigid-plastic FRICTION
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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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ADAPTIVE RIGID-PLASTIC MESHLESS GALERKIN METHOD AND ITS APPLICATION IN ANALYSIS OF EXTRUSION PROCESSES 被引量:1
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作者 WU Xin ZHAO Guoqun +2 位作者 WANG Weidong GUAN Yanjin LU Ping 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第2期26-31,共6页
Under the hypothesis of the rigid-plastic material, specific efforts are placed on the developments of the key simulation techniques of the meshless Galerkin method because of the complexity of the deformation process... Under the hypothesis of the rigid-plastic material, specific efforts are placed on the developments of the key simulation techniques of the meshless Galerkin method because of the complexity of the deformation process as well as the generality and atomization of the simulation procedures for non-steady state large deformation plastic processes, therefore, an adaptive rigid meshless Galerkin method is developed. The influence domain control method is used in the least square approximation by dynamic evaluation of the magnitude of the influence domain and the effective control of the amount and the positions of the points in the least square approximation in order to improve approximation precision. The amount of the Gauss integration points in the discrete domain is maintained in a considerable magnitude in order to ensure the integration precision in the discrete domain. The length of the frictional boundary of the plastic deformation process may be getting longer when its deforma- tion is getting severe. Thus, the densities of the boundary points of some places get lower. The adaptive boundary points setting method is employed to improve the approximation precision of the boundary points and enhance the constraint of the boundary condition by adaptive control of boundary point density. Some typical extrusion processes are analyzed, detail simulation results such as the deformation field, velocity field, effective strain field, effective strain rate field, the volume loss curve and load-stroke curve are obtained. The effectiveness of the method developed is demonstrated and the precision of the meshless simulation is proved by overall comparison with the results obtained by using the commercial software deform. 展开更多
关键词 rigid-plastic Galerkin Adaptive Non-steady state Extrusion Severe deformation
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RIGID-PLASTIC/RIGID-VISCOPLASTIC FEM BASED ON LINEAR PROGRAMMING-THEORETICAL MODELING AND APPLICATION FOR PLANE-STRAIN PROBLEMS
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作者 WangHuaibao XuWeili 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第1期106-109,共4页
A new rigid-plastic/rigid-viscoplastic (RP/RVP) FEM based on linearprogramming (LP) for plane-strain metal forming simulation is proposed. Compared with thetraditional RP/RVP FEM based on iteration solution, it has so... A new rigid-plastic/rigid-viscoplastic (RP/RVP) FEM based on linearprogramming (LP) for plane-strain metal forming simulation is proposed. Compared with thetraditional RP/RVP FEM based on iteration solution, it has some remarkable advantages, such a it'sfree of convergence problem and its convenience in contact, incompressibility constraint and rigidzone treatment. Two solution examples are provided to validate its accuracy and efficiency. 展开更多
关键词 rigid-plastic/rigid-viscoplastic FEM Linear programming
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Study on Remeshing Technique for Three-Dimensional Rigid-plastic Finite Element Simulation
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作者 单德彬 吕炎 王真 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1997年第3期76-79,共4页
A new method of three-dimensional remeshing is proposed for rigid-plastic finiteelement analysis of a complicated forging process.The forging process of a cylindricalhousing has been simulated to show the effectivenes... A new method of three-dimensional remeshing is proposed for rigid-plastic finiteelement analysis of a complicated forging process.The forging process of a cylindricalhousing has been simulated to show the effectiveness of the scheme.The result ofsimulation shows that the computation can be effectively carried out by using the des-cribed remeshing scheme. 展开更多
关键词 rigid-plastic FINITE element simulation REMESHING CYLINDRICAL HOUSING
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RADIAL EXTRUSION PROCESS BY THREE-DIMENSIONAL RIGID-PLASTIC FEM SIMULATION
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作者 Chen Jun, Peng Yinghong, Zuo Xu, Ruan Xueyu National Die & Mold CAD Engineering Research Center, Shanghai Jiao Tong University, Shanghai 200030 《中国有色金属学会会刊:英文版》 CSCD 1997年第4期48-52,共5页
RADIALEXTRUSIONPROCESSBYTHREEDIMENSIONALRIGIDPLASTICFEMSIMULATION①ChenJun,PengYinghong,ZuoXu,RuanXueyuNati... RADIALEXTRUSIONPROCESSBYTHREEDIMENSIONALRIGIDPLASTICFEMSIMULATION①ChenJun,PengYinghong,ZuoXu,RuanXueyuNationalDie&MoldCADEn... 展开更多
关键词 RADIAL EXTRUSION three dimensional rigid plastic FEM numerical SIMULATION
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ANALYSIS OF THE LARGE DEFLECTION DYNAMIC RESPONSE OF RIGID-PLASTIC CIRCULAR PLATE RESTING ON FLUID
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作者 Zhang Shanyuan Wang Tiefeng (Taiyuan University of Technology,Taiyuan 030024 P.R.China) 《Acta Mechanica Solida Sinica》 SCIE EI 1994年第4期334-346,共13页
A study is presented for the large deflection dynamic response of rigid- plastic circular plate resting on potential fluid under a rectangular pressure pulse load. By virtue of Hankel integral transform technique,this... A study is presented for the large deflection dynamic response of rigid- plastic circular plate resting on potential fluid under a rectangular pressure pulse load. By virtue of Hankel integral transform technique,this interaction problem is reduced to a problem of dynamic plastic response of the plate in vacuum.The closed-form solutions are derived for both middle and high pressure loads by solving the equations of motion with the large deflection in the range where both bending moments and membrane forces are important.Some numerical results are given. 展开更多
关键词 rigid-plastic circular plate LARGE deflection dynamic response potential fluid Hankel integral transform technique
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Coupled Thermo-Mechanical Modeling of Long Cone-Shaped Forging Based on Rigid Visco-Plastic FEM
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作者 刘雪峰 汪凌云 张利 《Journal of Southwest Jiaotong University(English Edition)》 2002年第1期39-44,共6页
Based on synthetically considering the coupled thermo mechanical relations between temperature and deforming, a numerical simulation of the forging process for the special long cone shaped workpiece of Al 5.44Mg 2... Based on synthetically considering the coupled thermo mechanical relations between temperature and deforming, a numerical simulation of the forging process for the special long cone shaped workpiece of Al 5.44Mg 2.15Li 0.12Zr alloy at high temperature was conducted by using the rigid visco plastic finite element method. The relations between the total load and the displacement during the forging, and the distributions of stress, strain, temperature and strain rate, which can provide useful information for the process design, are obtained. 展开更多
关键词 Al Li alloy coupled thermo mechanical analysis rigid visco plastic FEM
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MULTI-PARAMETER ACCELERATED MODIFIED NEWTON-RAPHSON METHODS FOR RIGIDPLASTIC FE ANALYSIS
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作者 Shi Gang Liu Xiaolin 《Acta Mechanica Solida Sinica》 SCIE EI 2002年第4期323-331,共9页
Applications of certain multi-parameter acceleration techniques used with themodified New-ton-Raphson (mN-R) methods to solve the nonlinear equations arising from rigid-plasticfinite element analysis are investigated.... Applications of certain multi-parameter acceleration techniques used with themodified New-ton-Raphson (mN-R) methods to solve the nonlinear equations arising from rigid-plasticfinite element analysis are investigated. New modified multi-parameter techniques, developed fromCrisfield's multi-parameter methods, are utilized to solve these nonlinear equations. The numericalperformance of these techniques is compared with the standard Newton-Raphson method (sN-R),Crisfield's single parameter method (C1), Crisfield's two parameter method (C2) and Crisfield'sthree parameter method (C3). The new techniques do not involve additional residual force calculationand require little extra computational effort. In addition, they are more robust and efficient thanother existing acceleration techniques. 展开更多
关键词 rigid-plastic FEM standard newton-raphson method modified newton-raphsonmethod crisfield's multi-parameter accelerated techniques modified multi-parameter acceleratedtechniques
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3D RIGID-PLASTIC FINTEELEMENT ANALYSIS OF BACKWARD SPINNING OF CYLINDRICAL WORKPIECE
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作者 Ruan Feng Zhou Zhaoyao ( South China University of Technology) LuYan +1 位作者 WanZheng Xue Kemmg (Harbin Institute of Technology) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1996年第1期63-70,78,共3页
Backward spinning is analyzed by 3D rigid-plastic FEM.A 3D mechanical model for backward spinning is presented. The distributions are obtained of strain一rate and stress in the con- tact area of the roller a... Backward spinning is analyzed by 3D rigid-plastic FEM.A 3D mechanical model for backward spinning is presented. The distributions are obtained of strain一rate and stress in the con- tact area of the roller and its adjacent area.The results can well intemret the principle of defonnation of backward spinning. The relationship between the roller angle and three components ofspinning force is found out, and the optimum roller angle, when the general spinning foree gets to the minimum value, is calculated. The distributions of defonnation area obtained by FEM agree with the experimental result well. 展开更多
关键词 Cylindrical workpiece Backward spinning 3D rigid-plastic FEM
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钢管混凝土柱-钢梁外加强环螺栓连接节点抗震性能有限元分析 被引量:1
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作者 丁发兴 罗开源 +2 位作者 吕飞 张威振 胡明文 《建筑科学与工程学报》 CAS 北大核心 2024年第4期10-19,共10页
为深入研究钢管混凝土柱-钢梁外加强环螺栓连接节点的抗震性能,建立了螺栓连接节点的精细化三维实体有限元模型。在对已有试验成果进行验证分析的基础上,研究加劲肋、螺栓连接数量对节点塑性耗能分配机制的影响。结果表明:当钢材本构后... 为深入研究钢管混凝土柱-钢梁外加强环螺栓连接节点的抗震性能,建立了螺栓连接节点的精细化三维实体有限元模型。在对已有试验成果进行验证分析的基础上,研究加劲肋、螺栓连接数量对节点塑性耗能分配机制的影响。结果表明:当钢材本构后期考虑韧性损伤后,有限元计算结果与已有拟静力试验结果更吻合;CFST-1节点(梁高300 mm,有螺栓垫板)耗能能力最优,但仅达到相应焊接节点的一半;与CFST-1节点相比,CFST-3节点(梁高300 mm,无螺栓垫板)及CFST-2节点(梁高250 mm,有螺栓垫板)的总耗能更低;各螺栓节点的塑性耗能分配机制主要依靠梁耗能,而相应的加强环焊接节点主要依靠梁与加强环耗能;当螺栓节点采用环板加劲肋、4排螺栓以及腹板加劲肋构造优化后,刚度、承载力、延性与相应焊接节点一致,总塑性耗能达到刚接节点的79.1%,基本达到刚接节点的抗震水平。 展开更多
关键词 梁柱节点 螺栓连接 抗震性能 塑性耗能分配机制 刚接节点
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钢筋混凝土薄壁空心高墩塑性铰长度计算方法
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作者 袁辉辉 程军 +3 位作者 蔡丁锡 吴庆雄 詹远辉 袁朝阳 《福州大学学报(自然科学版)》 CAS 北大核心 2024年第5期577-586,共10页
针对我国现行抗震设计规范尚未明确给出钢筋混凝土(RC)薄壁空心高墩塑性铰长度计算方法的问题,首先收集整理了既有RC桥墩塑性铰长度计算方法以及试验数据,分析影响塑性铰计算长度的主要因素;同时对实际桥梁工程采用的RC薄壁空心墩构造... 针对我国现行抗震设计规范尚未明确给出钢筋混凝土(RC)薄壁空心高墩塑性铰长度计算方法的问题,首先收集整理了既有RC桥墩塑性铰长度计算方法以及试验数据,分析影响塑性铰计算长度的主要因素;同时对实际桥梁工程采用的RC薄壁空心墩构造参数进行统计归纳.在验证有限元建模方法准确性后,采用ABAQUS软件建立了高度为40~120 m的8种典型RC薄壁空心高墩的精细化有限元模型,并开展非线性推覆分析,得到不同高度桥墩的等效塑性铰长度.最后讨论不同塑性铰长度计算方法的适用性,发现Eurocode 8规范的计算公式精度最高,可用于计算RC薄壁空心高墩的塑性铰长度. 展开更多
关键词 塑性铰长度 连续刚构桥 钢筋混凝土薄壁空心高墩 有限元分析
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山东港口大厦结构设计
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作者 李建峰 薛明玉 +4 位作者 孙绍东 刘于晨 胡海涛 冯健 衣俊 《建筑结构》 北大核心 2024年第9期17-22,34,共7页
山东港口大厦采用钢管混凝土柱-钢梁-钢筋混凝土核心筒混合结构体系,角部6根斜钢管混凝土柱由下至上逐层缩进,与向上收紧的风帆形态相呼应。结构存在各层楼板局部不连续、跃层柱和高度超限等不规则项,按C级抗震性能目标进行性能化设计,... 山东港口大厦采用钢管混凝土柱-钢梁-钢筋混凝土核心筒混合结构体系,角部6根斜钢管混凝土柱由下至上逐层缩进,与向上收紧的风帆形态相呼应。结构存在各层楼板局部不连续、跃层柱和高度超限等不规则项,按C级抗震性能目标进行性能化设计,采用SAUSAGE进行罕遇地震作用下的弹塑性分析,找出结构薄弱部位和构件,并采取针对性的抗震加强措施。空中大堂采用“刚柔结合”的钢-索网幕墙体系,介绍了支撑幕墙的主体结构。采用ANSYS对钢管混凝土柱斜柱变直柱节点进行了有限元分析。分析结果表明结构抗震性能良好,满足设定的抗震性能目标。 展开更多
关键词 山东港口大厦 钢管混凝土斜柱 钢-索网幕墙 动力弹塑性分析 节点分析 刚柔结合
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AN ANALYSIS oF THE SHEAR FAILURE OF RIGID-LINEAR HARDENING BEAMS UNDER IMPULSIVE LOADING 被引量:4
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作者 王礼立 Norman Jones 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1996年第4期338-348,共11页
A theoretical rigid-plastic analysis for the dynamic shear failure of beams under impulsive loading is presented when using a travelling plastic shear hinge model which tabes into account material strain hardening. Th... A theoretical rigid-plastic analysis for the dynamic shear failure of beams under impulsive loading is presented when using a travelling plastic shear hinge model which tabes into account material strain hardening. The maximum dynamic shear strain and shear strain-rate can be predicted in addition to the permanent transverse deflections and other parameters. The conditions for the three modes of shear failure, i.e., excess deflection failure, excess shear strain failure and adiabatic shear failure are analyzed. The special case of an infinitesimally small plastic zone is discussed and compared with Nonaka's solution for a rigid, perfectly plastic material. The results can also be generalized to examine the dynamic response of fibre-reinforced beams. 展开更多
关键词 shear failure rigid-linear hardening plastic beam dynamic response impulsive loading adiabatic shear
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Plastic variational principle based on the least work consumption principle
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作者 唐松花 罗迎社 +1 位作者 周筑宝 王智超 《Journal of Central South University》 SCIE EI CAS 2008年第S1期39-42,共4页
Plastic variational principles are foundation to solve the boundary-value problems of plastic mechanics with the variational method(or energy method) and finite element method.The most convenient way of establishing d... Plastic variational principles are foundation to solve the boundary-value problems of plastic mechanics with the variational method(or energy method) and finite element method.The most convenient way of establishing different kinds of variational principles is to set up the extreme principle related to the studied problem.Based on a general new extreme principle-the Least work consumption principle,the variational principles of the rigid-plastic and rigid-viscoplastic material were derived.In comparison with existing methods,the method in this paper is more clear and direct,and the physical meaning is clear-cut.This method can offer a new way for establishing other kinds of variational principles. 展开更多
关键词 rigid-plastic rigid-viscoplastic VARIATIONAL PRINCIPLE the least work CONSUMPTION PRINCIPLE
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Dynamic Plastic Response of Circular Plates Resting on Fluid with Finite Deformation
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作者 Wang, G Li, Z Chen, TY 《China Ocean Engineering》 SCIE EI 1998年第1期53-62,共10页
This paper concerns the dynamic plastic response of a circular plate resting on fluid subjected to a uniformly distributed rectangular load pulse with finite deformation. It is assumed that the fluid is incompressible... This paper concerns the dynamic plastic response of a circular plate resting on fluid subjected to a uniformly distributed rectangular load pulse with finite deformation. It is assumed that the fluid is incompressible and inviscous, and the plate is made of rigid-plastic material and simply supported along its edge. By using the method of the Hankel integral transformation, the nonuniform fluid resistance is derived as the plate and the fluid is coupled. Finally, an analytic solution for a circular plate under a medium load is obtained according to the equations of motion of the plate with finite deformation. 展开更多
关键词 rigid-plastic circular plate dynamic plastic response fluid-solid coupling finite deformation
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RIGID FINITE ELEMENT AND LIMIT ANALYSIS 被引量:5
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作者 张雄 钱令希 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1993年第2期156-162,共7页
According to the lower-bound theorem of limit analysis the Rigid Finite Element Meth-od(RFEM)is applied to structural limit analysis and the linear programmings for limit analysis are deducedin this paper.Moreover,the... According to the lower-bound theorem of limit analysis the Rigid Finite Element Meth-od(RFEM)is applied to structural limit analysis and the linear programmings for limit analysis are deducedin this paper.Moreover,the Thermo-Parameter Method(TPM)and Parametric Variational principles(PVP)are used to reduce the computational effort while maintaining the accuracy of solutions.A better solution isalso obtained in this paper. 展开更多
关键词 rigid finite element method Limit analysis plastic theory thermo-parametric method parametric variational principles
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高烈度震区预制拼装连续刚构桥延性分析
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作者 贾继祥 张雷 《铁路工程技术与经济》 2024年第5期27-31,共5页
本文基于纤维梁柱单元模型的基本原理,对广佛西环城际铁路4×40m预制拼装连续刚构在罕遇地震作用下进行弹塑性分析,结果表明:在10.5~22m墩高范围内,随着墩高增加,塑性转角、剪力计算值有降低的趋势;箍筋对桥墩的延性影响很大,甚至... 本文基于纤维梁柱单元模型的基本原理,对广佛西环城际铁路4×40m预制拼装连续刚构在罕遇地震作用下进行弹塑性分析,结果表明:在10.5~22m墩高范围内,随着墩高增加,塑性转角、剪力计算值有降低的趋势;箍筋对桥墩的延性影响很大,甚至在某种程度依赖于箍筋配置的合理与否,合理的配置箍筋是一种经济有效的提高抗震性能的方式;采用《铁路工程抗震设计规范》和《城市桥梁抗震设计规范》两种方法验算了该种桥梁桥墩的抗震性能,其弹塑性分析方法和延性抗震成果为其他高烈度震区刚构桥延性抗震设计提供了参考。 展开更多
关键词 预制拼装 连续刚构 罕遇地震 纤维模型 时程分析 塑性铰 弹塑性分析
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