Finite Element Modeling of Hot Stamping

Presented is a methodology for finite element modeling of the continuous press hardening of car components using ultra high strength steel. The methodology is not specific to a particular problem or any FE software package. The Numisheet 2008 benchmark problem BM03 was selected as the model problem to be solved. Although there are several commercial finite element computer codes available to model hot stamping, this paper presents results using LS‐DYNA. All modeling parameters, including thermal‐mechanical material property data and boundary condition data, are given.     

Finite Element Multi-scale Modeling of Chemical Segregation in Steel Solidification Taking into Account the Transport of Equiaxed Grains

Metallurgical and Materials Transactions A - The transport of solid crystals in the liquid pool during solidification of large ingots is known to have a significant effect on their final grain...     

九辊矫直机钢板矫直工艺的有限元模拟研究

通过建立的有限元模型,研究了22 mm Q345钢板(/%:≤0.20C、≤O.55Si、≤1.70Mn、O.02～O.15V、0.015～0.060Nb、0.02～O.20Ti)在9辊矫直机矫直时首辊与尾辊的位置对钢板平直度和表面残余应力的影响,得到钢板不平的位置集中在尾部。1~#辊和9~#辊在高度上的自由调节,可以保证钢板出矫直机时不会出现上弯或下弯。钢板的上表面残余应力比下表面低,延钢板长度方向,钢板表面残余应力呈现尾部高、头部低的状态。     

熔盐氯化炉稳态温度场有限元分析

分析了锦州钛业有限公司1#熔盐氯化炉的传热特征,利用ANSYS有限元分析软件建立了熔盐氯化炉稳态温度场有限元模型.计算结果显示熔盐氯化炉炉壳温度在30～50℃,熔盐最高温度747℃,这与现场实测数据相近;熔盐氯化炉的热流密度和温度梯度说明炉墙传热对稳态温度场的影响较小,而喷淋四氯化钛泥浆是影响氯化炉稳态温度场的最大因素,并依此提出了解决熔盐温度过高的措施.     

Finite Element Simulation of Cold-Rolling Process of Shaped Steel Tube for Driving Shaft

 Based on the deformation characteristics of Y-type mill, this paper proposes a finite element model for dynamically simulating the formation process of shaped steel tube for driving shaft. The distributions of stress and strain were obtained from the simulation. The outer diameter and transverse wall thickness were also analyzed quantitatively. Experiment was done on Y-type mill. A comparison between simulation results and experiment results shows that the simulating results of shaped steel tube are in good agreement with the on-site data. The model could provide the basis for theoretical research and engineering applications of shaped steel tube rolling process.     

低碳结构钢中厚板MAS轧制过程有限元模拟

根据低碳结构钢Q235(C≤0.20%)4300 mm中厚板现场轧制工艺,采用有限元软件ABAQUS/Explicit建立弹塑性有限元模型对展宽比1.70、精轧伸长率7.87的中厚板普通轧制过程和MAS(水岛平面形状控制轧制法)轧制过程分别进行了模拟计算,对不同变形阶段进行了对比分析。结果表明,MAS轧制法能明显改善中厚板轧后平面形状,其形状的改变量与MAS轧制段设置参数直接相关,对比不同参数下MAS轧制结果得出MAS轧制最优参数△L×△h为300×3。     

钢锭与锭模三维应力场耦合分析有限元系统

介绍了由清华大学开发的耦合分析钢锭与锭模钢锭凝固过程中应力场的三维有限元软件，导出了弹塑性蠕变在各种差分格式下的有限元迭代公式，并给出拉压性能不同的材料的有限元计算法，此外，分析了各类边界条件的处理方法，并对接触边界与斜约束边界的算法作了专门的探讨。有限元计算结果对锭模突发性顺裂产生部位及时间的分析结论与现场观察结果的吻合证明了该系统的可靠性。     

Mixed Finite Element for Three-Dimensional Nonlinear Dynamic Analysis of Rectangular Concrete-Filled Steel Tube Beam-Columns

A beam finite-element formulation following Euler-Bernoulli beam theory is presented for geometrically and materially nonlinear analysis of rectangular concrete-filled steel tube (RCFT) beam-columns. The formulation is geared for conducting transient dynamic analysis of composite steel/concrete frame structures. The element stiffness and internal forces were derived through adopting a mixed finite-element approach based on the Hellinger-Reissner variational principle. The load transfer between the steel and concrete constitutive materials was provided through steel and concrete interface via friction and interlocking. Six extra translational degrees-of-freedom (DOFs) were added to the conventional 12 DOF beam element to quantify the differential displacement between the two media. The formulation was verified for a range of geometrically nonlinear test problems and geometrically and materially nonlinear RCFT experimental test specimens from the literature. Strong correlation and convergence characteristics were achieved compared to the published results.     

应用有限元方法分析热处理炉的钢结构

以热处理炉为例,介绍应用有限元方法分析炉体的钢结构,并对有限元分析与常规计算方法进行了比较。结果发现:采用有限元方法可以直观地了解钢结构受力状态,可以优化钢结构设计。     

50m钢烟囱的有限元分析计算

运用通用有限元程序ANSYS,对50 m钢烟囱结构进行了动力特性、静力、风荷载、温度和地震作用的分析,然后根据规范要求对各工况荷载作用下Von mises应力组合,得出关键部位最大应力,验算钢烟囱筒壁强度和稳定性。其验算结果均满足现行规范要求。     

有限元模拟技术在工字钢控冷过程中的应用

利用有限元方法对工字钢轧后控制冷却过程进行模拟，通过设定与实际冷却过程相符的初始条件和边界条件，获得轧件在冷却过程的瞬态温度场分布。有限元模拟结果与实际结果吻合较好，验证了模型的准确性。应用模拟结果将现有自然空冷的冷却工艺优化为空冷与水冷相结合的控制冷却工艺，改进后的冷却工艺显著改善了工字钢断面温度场分布。     

Research on Finite Element Determinant of Orthotropic Plate in Steamlined Steel Box Girder

A new type of streamlined girder bridge with orthotropic plates steel box girder is evaluated via testing and analysis. Although the use of finite element modeling has become indispensable for the detailed calculation of certain details and connections, an analytical approach remains a very effective method to determine the internal forces and moments in the box girder. Two new theoretical analysis models are undertaken to study the behavior of aimed bridge. The FE determinants of the two models are built. The validity of the proposed methods is checked by full finite element calculation using shell elements. In addition, a total experimental model is set up to verify the reliability of computational models. The computation results compare well with the experimental results. It is illustrated that it is an effective method to predict properties of this kind of bridges.     

斜刃剪板机剪切能力测定与机架有限元分析

通过对邯郸钢铁(集团)有限公司中板厂斜刃剪板机剪切力及机架应力的现场实测与有限元分析,给出了大型剪切机剪切力的测试方法及测试结果,并采用有限元法对机架应力与变形进行了分析,找出了机架结构的薄弱环节,计算结果与测试结果相吻合.     

Finite Element Modeling of the Inertia Friction Welding of Dissimilar High-Strength Steels

Finite element (FE) process modeling of inertia friction welding between dissimilar high-strength steels, AerMet^® 100 and SCMV, has been carried out using the DEFORM?-2D (v10.0) software. This model was validated against experimental data collected for a test weld performed between the materials; this included process data such as upset and rotational velocities as well as thermal data collected during the process using embedded thermocouples. The as-welded hoop residual stress from the FE model was also compared with experimental measurements taken on the welded component using synchrotron X-ray and neutron diffraction techniques. The modeling work considered the solid-state phase transformations which occur in the steels, and the trends in the residual stress data were well replicated by the model.     

Finite Element Analysis of Continuous Induction Reheating of Hot Steel Long Products

This paper deals with the study of induction reheating of long steel products starting from an initial temperature of around 700 Celsius degrees,based on finite element models.Two industrial innovative technologies are considered:reheating of hot billets between the continuous casting lines and the rolling mill facilities and reheating of steel rails before quenching,if the rail upper side hardening is included in the rolling mill facilities.The finite element analysis of coupled electromagnetic and thermal phenomena takes into account the dependences on temperature of electromagnetic and thermal properties of steel.