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Study on hot deformation behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy using a combination of strain-compensated Arrhenius constitutive model and Finite element simulation method

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Journal of Magnesium and Alloys 2023年第3期11卷 1016-1028页

作者： Li Hu Mengwei Lang Laixin Shi Mingao Li Tao Zhou Chengli Bao Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China

Isothermal hot compression experiments were conducted on homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy to investigate hot deformation behavior at the temperature range of 673-773 K and the strain rate range of 0.001-1 s^(-1)by using a Gleeble-1500D thermo mechanical simulator.Metallographic characterization on samples deformed to true strain of 0.70 illustrates the occurrence of flow localization and/or microcrack at deformation conditions of 673 K/0.01 s^(-1),673 K/1 s^(-1)and 698 K/1 s^(-1),indicating that these three deformation conditions should be excluded during hot working of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy.Based on the measured true stress-strain data,the strain-compensated Arrhenius constitutive model was constructed and then incorporated into UHARD subroutine of ABAQUS software to study hot deformation process of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy.By comparison with measured force-displacement curves,the predicted results can describe well the rheological behavior of homogenized Mg-8.5Gd-4.5Y-0.8Zn-0.4Zr alloy,verifying the validity of Finite element simulation of hot compression process with this complicated constitutive model.Numerical results demonstrate that the distribution of values of material parameters(α,n,Q and ln A)within deformed sample is inhomogeneous.This issue is directly correlated to the uneven distribution of equivalent plastic strain due to the friction effect.Moreover,at a given temperature the increase of strain rate would result in the decrease of equivalent plastic strain within the central region of deformed sample,which hinders the occurrence of dynamic recrystallization(DRX).

关键词： Mg-RE-Zn alloy Hot deformation Microstructure evolution Constitutive model Finite element simulation

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Hot deformation behavior and Finite element simulation of Mg-8.3Gd-4.4Y-1.5Zn-0.8Mn alloy

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Journal of Rare Earths 2022年第5期40卷 831-839,I0006页

作者： Jiabin Fan Minglong Ma Kui Zhang Yongjun Li Xinggang Li Guoliang Shi Jiawei Yuan State Key Laboratory of Nonferrous Metals and Process GRINM Co.Ltd..Beijing 100088China GRIMAT Engineering Institute Co.Ltd Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

To study the hot deformation behavior of Mg-8.3 Gd-4.4 Y-1.5 Zn-0.8 Mn(wt%) alloy,hot compression tests were conducted using a Gleeble-3500 thermal simulator at temperatures ranging from 653 to773 K,true strain rates of 0.001-1 s^(-1),and a deformation degree of 60%.Results of hot compression experiments show that the flow stress of the alloy increases with the strain rate.The true stress-true strain curves are corrected by correcting the effect of temperature rise in the deformation process.Activation energy,Q,equal to 287380 J/mol and material constant,n,equal to 4.59 were calculated by fitting the true stress-true strain curves.Then,the constitutive equation was established and verified via Finite element simulation.Results of the hot processing map show that the probability of material instability increases with the degree of deformation,which indicates that the material is not suitable for large deformation in a single pass.On the whole,the alloy is appropriate for multipass processing with small deformation and a suitable processing temperature and strain rate are 733 K and 0.01 s-1,respectively.

关键词： Mg-Gd-Y-Zn-Mn alloy Hot deformation Constitutive relationship Finite element simulation Processing map Rare earths

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Effect of stress profile on microstructure evolution of cold-drawn commercially pure aluminum wire analyzed by Finite element simulation

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Journal of Materials Science & Technology 2018年第7期34卷 1214-1221页

作者： Y.K.Zhu Q.Y.Chen Q.Wang H.Y.Yu R.Li J.P.Hou Z.J.Zhang G.P.Zhang Z.F.Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences National Quality Supervision & Inspection Center of Electrical Equipment Safety Performance Zhejiang Huadian Equipment Testing Institute

The evolution of microstructure in the drawing process of commercially pure aluminum wire （CPAW） does not only depend on the nature of materials, but also on the stress profile. In this study, the effect of stress profile on the texture evolution of the CPAW was systematically investigated by combining the numerical simulation and the microstructure observation. The results show that the tensile stress at the wire center promotes the formation of 〈111〉 texture, whereas the shear stress nearby the rim makes little contribution to the texture formation. Therefore, the 〈111 〉 texture at the wire center is stronger than that in the surface layer, which also results in a higher microhardness at the center of the CPAW under axial loading.2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Commercially pure aluminum wire Cold drawing Texture Finite element simulation Stress profile

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Finite element simulation on the deep drawing of titanium thin-walled surface part

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Rare Metals 2010年第1期29卷 108-113页

作者： GAO Enzhi, LI Hongwei, KOU Hongchao, CHANG Hui, LI Jinshan, and ZHOU Lian State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China State Key Laboratory of Solidification Processing Northwestern Polytechnical University

The deep drawing of titanium thin-walled surface part was simulated based on a self-developed three-dimensional finite element model. After an investigation on forming rules, a virtual orthogonal experimental design was adopted to determine the significance of processing parameters, such as die radius, blank holder force, and friction coefficient, on the forming process. The distributions of thickness and equivalent plastic strain of the drawn part were evaluated. The results show that die radius has a relative major influence on the deep drawing process, followed by friction coefficient and blank holder force.

关键词： deep drawing titanium alloy Finite element simulation orthogonal experiment processing parameters

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Finite element simulation of inertia friction welding of superalloy bars

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China Welding 2012年第1期21卷 13-17页

作者：王非凡李文亚代野李京龙 State Key Laboratory of Solidifieation Processing Northwestern Polytechnical UniversityXi’an710072

A thermo-mechanical coupling.finite element model was built to investigate the inertia friction welding of GH4169 bars. The remeshing and map solution techniques were adopted. Ttle whole welding process was investigated by adopting an innovative heat generation model and the flywheel rotational speed measured via the experiment. The simulated evolution of axial shortening shows a good agreement with the experiment. In addition, extensive .strain concentration presents in the interface and flash, and the largest ,strain exists near the flash root. Moreover, an intere.sting thermal reflux phenomenon during the cooling stage was found.

关键词： inertia friclion welding Finite element simulation heat generation thermal reflux

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Finite element simulation of welded thin-walled stainless steel container based on SYSWELD

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China Welding 2012年第2期21卷 23-27页

作者：何晓祥俞建荣郭云龙杨德宇王岚 Department of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBcijing102617 East China Engineering Science and Techniology Co. Ltd.Hefei230001

The temperature field and stress fields of 18 - 8 stainless steel container structure were computed during and after tungsten inert gas （TIG） arc welding based on the SYSWELD software. The convection, radiation and conduction were all considered during the simulation process as well as temperature-dependent material properties. The results show that the peak temperature occurs on the heat source location. Steep temperature gradients are observed ahead of the heat source. Axial tensile stress and hoop compressive stress are observed in the weld seam between cylinder and head. Axial compressive stress and hoop tensile stress are observed near the weld seam between cylinder and heads. Axial compressive stress and hoop tensile stress are observed in the axial weld seam of cylinder. Axial tensile stress and hoop compressive stress are observed near the axial weld seam of cylinder. The aim of the above research is to provide a basic theory and some calculation methods for the thin-walled container welding technology so that the failures of these structures in service due to residual stresses may be minimized.

关键词： numerical simulation thin-walled containers Finite element simulation temperature field stress field

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THREE-DIMENSIONAL Finite element simulation OF TOTAL KNEE JOINT IN GAIT CYCLE

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Acta Mechanica Solida Sinica 2009年第4期22卷 347-351页

作者： Yuan Guo Xushu Zhang Weiyi Chen The Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan 030024 China

Based on CT scanning pictures from a volunteer＇s knee joint, a three-dimensional finite element model of the healthy human knee joint is constructed including complete femur, tibia, fibular, patellar and the main cartilage and ligaments. This model was validated using experimental and numerical results obtained from other authors. The pressure distribution of contact surfaces of knee joint are calculated and analyzed under the load action of ‘heel strike＇, ‘single limb stance＇ and ‘toe-off＇. The results of the gait cycle are that the contact areas of medial cartilage are larger than that of lateral cartilage; the contact force and contact areas would grow larger with the load increasing; the pressure of lateral meniscus is steady, relative to the significant variation of peak pressure in medial meniscus; and the peak value of contact pressure on all components are usually found at about 4570 of the gait cycle.

关键词： knee joint Finite element simulation contact pressure biomechanics

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RESEARCH ON THE SELECTION OF FRICTION MODELS IN THE Finite element simulation OF WARM EXTRUSION

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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 90-96页

作者： X.B.Lin H.S.Xiao Z.L.Zhang National Die and Mold CAD Engineering Research Center Shanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030China

During the process of Finite element simulation of precision warm forging, the selection of friction models has a direct effect on the precision accuracy of Finite element simulation results. Among all the factors which influence the selection of friction models, the distribution rule of normal stress at the tool-workpiece interface is a key one. To find out the distribution rule of normal stress at the tool-workpiece interface, this paper has made a systematic research on three typical plastic deformation processes: forward extrusion, backward extrusion, and lateral extrusion by a method of Finite element simulation. Then on the base of synthesizing and correcting traditional friction models, a new general friction model which is fit for warm extrusion is developed at last.

关键词： friction model warm extrusion Finite element simulation

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finite element modeling and simulation of the implantation of braided stent to treat cerebral aneurysm

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Medicine in Novel Technology and Devices 2020年第1期5卷 7-12页

作者： Yunhan Cai Zhuangyuan Meng Yeqing Jiang Xiaolong Zhang Xinjian Yang Shengzhang Wang Department of Aeronautics and Astronautics Fudan University200433China Department of Radiology Huashan HospitalFudan UniversityShanghai200041China Department of Interventional Neuroradiology Beijing Neurosurgery Institute and Beijing Tiantan HospitalCapital Medical UniversityBeijing100070China Institute of Biomedical Engineering and Technology Fudan University200433China

Braided stents were widely used to treat cerebral aneurysms and computational fluid dynamics(CFD)was used to evaluate the therapeutic effects.But the aneurysm-artery geometry used in CFD were usually undeformed which is inconsistent with clinical findings.Our team developed a finite element modeling workflow to simulate implantation of braided stents in patient-specific aneurysm-artery model.An LVIS-based braided stent was deployed into an aneurysm-artery model.The stent fully expanded,causing obvious deformation on the aneurysm-artery model.The workflow which we developed could provide reasonable deformed geometries of aneurysm-artery and braided stent for CFD computation and possibly assist surgical planning.

关键词： Cerebral aneurysms Finite element simulation Endovascular intervention Braided self-expandable stent

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Finite element simulation for mechanical response of surface mounted solder joints under different temperature cycling

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中国有色金属学会会刊：英文版 2001年第4期11卷 471-474页

作者：马鑫钱乙余 National Key Laboratory of Welding Harbin Institute of Technology Research and Analysis Center Electronic Product Reliability and Environmental Testing Research Institute National Key Laboratory of Welding Harbin Institute of Technology Department of Mechanical Engineering Hiroshima UniversityHigashi-Hiroshima 739 Japan

Nonlinear Finite element simulation for mechanical response of surface mounted solder joint under different temperature cycling was carried out. Seven sets of parameters were used in order to evaluate the influence of temperature cycling profile parameters. The results show that temperature cycling history has significant effect on the stress response of the solder joint. Based on the concept of relative damage stress proposed by the authors, it is found that enough high temperature holding time is necessary for designing the temperature cycling profile in accelerated thermal fatigue test.

关键词： Finite element simulation surface mounted solder joint thermal cycling mechanical response

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