板坯立辊轧边过程的实验研究

板坯经立辊轧制后，头、尾将出现鱼尾，边部将加厚，板坯横断面呈现“狗骨”形。其变形比较复杂，变形机理研究未见报道。本文采用试塑性法对板坯轧边过程进行了实验研究，获得了大量的实验数据，根据实验数据对各种变形参数在变形区的分布和金属流动规律进行了研究与探索。分析了产生“狗骨”的影响因素，定量地确定内部的变形参数，这对实现金属变形的精确控制，提高产品精度与质量，具有重要的理论意义。     

塑性成形过程三维刚塑性有限元模拟软件开发

刚塑性有限元法是模拟塑性成形过程的有效手段。本文介绍了自行开发的三维刚塑性有限元模拟软件的主要功能，通过对给定算例的模拟计算与实验验证，检验了软件的可靠性与适用性。     

金属塑性成形的三维刚塑性有限元模拟技术研究

本文对三维刚塑性有限元模拟理论及有关技术问题进行了系统的研究，针对模拟过程中的模具型腔曲面几何描述，动态接触边界处理等关键技术提出了有效的算法开发了相应的三维模拟软件。并以球冲头压缩方坯和曲轴成形为例进行了模拟，计算结果表明所提出的算法和软件系统是可行的。     

金属体积成形过程三维刚塑性有限元模拟系统

本文论述了金属体积成形过程三维刚塑性有限元模拟分析系统的结构和程序实现，开发了相应的三维刚塑性有限元模拟软件，并以直齿圆柱齿轮精锻过程为研究对象，对金属体积成形过程进行了三维刚塑性有限元模拟，结果表明该软件系统是可靠的。     

快速车轮成形过程的刚塑性有限元数值模拟

采用刚塑性有限元模拟软件TFOMR2模拟了915KKD快速车轮的预成形过程。通过分析车轮预成形过程的塑性流动规律和镦粗压下量对预成形的影响，预测了预成形后毛坯充填模膛的情况，并得到了较佳的镦粗压下量值，为车轮成形工艺设计提供了科学依据。     

热力耦合刚粘塑性有限元模拟技术的研究

热锻过程中温度和变形相互之间的影响是非常显著的。以刚粘塑性有限元法和热力耦合模拟热锻过程的基本原理为基础开发了一套有限元模拟软件，对模拟中存在的初始速度场、收敛准则和摩擦条件等关键问题提出了有效解决办法，并以镦粗为例进行了模拟。     

叶片精锻三维刚粘塑性有限元模拟系统的研究

叶片精锻是叶片锻造的发展趋势，但由于叶片形状复杂，所用材料难变形，实际生产中不得不进行反复试制，造成很大浪费。计算机技术的飞速发展，使得采用三维有限元数值模拟技术模拟叶片精锻过程成为可能。为此，在解决三维有限元模拟关键技术问题的基础上，自行开发了面向叶片精锻过程的三维刚粘塑性有限元模拟分析系统3D—PFS。系统的可靠性得到了以塑泥为模拟材料的物理模拟试验的验证。对不同类型叶片精锻过程的进一步模拟分析，结果表明：3D—PFS是模拟分析叶片精锻过程可靠的工具。该研究对提高叶片锻造工艺的研究水平及发展叶片精锻理论具有重要意义。     

三维刚塑性有限元中网格重分技术的研究

本在深入研究了三维网格重分技术的基础上，针对轴类锻件的网格重分提出了一种简洁、有效的算法－投影组合法，并用等参逆变换法对重分前后的场量进行转换。模拟实验表明，该 算法生成的网格质量好、数据转换精度高。     

刚粘塑性有限元软件TFORM2及其应用

刚粘塑性有限元法是模拟塑性成形过程的有力手段，本文介绍了二维刚粘塑性软件ＴＦＯＲＭ２的功能，讨论了软件的主要理论和实施技术。该软件可在微机上运行，具有通用性强，前后处理功能丰富和模拟精度较高等特点。     

制造过程关键工艺环节的有限元仿真分析

目前生产中工艺规程的制定大都建立在经验或实验的基础上 ,许多工艺环节无法进行定量计算、产品质量难以保证 ,针对这一制造难题 ,将有限元技术引入工艺过程的分析计算 .研究了切削力对薄壁零件加工变形的影响 ;建立了切削加工过程中 ,因材料去除引起毛坯初始残余应力释放与再分布 ,导致工件产生加工变形的有限元分析模型 ,并进行了实验验证 .根据有限元模拟分析结果 ,提出了相应提高工件制造精度的工艺措施     

超精密切削切屑形成过程的三维有限元仿真

基于大变形有限元理论,建立了超精密切削的三维有限元模型,利用通用的商业有限元软件实现了超精密切削切屑形成过程的三维仿真．并对正交直角切削和斜角切削切屑的形成过程进行了比较深入的分析研究．结果表明：在同样切削条件下,斜角切削过程中产生的切削热、塑性应变和等效应力小于正交直角切削时产生的切削热、塑性应变和等效应力．     

土(堆)石坝施工过程位移场有限元仿真分析

基于克拉夫堤坝逐级施工位移分析提出考虑坡面的位移修正理论 ,研究施工过程位移机理 ,认为当前施工层加载产生的位移场 ,对于单单元层的施工层 ,只要施工层足够多 ,就能有较好的位移仿真精度 ;对于多单元层 ,当前层以下的位移增量是正确的 ,当前层内结点位移必须进行修正 ,考虑坡面影响的修正可以有较好的仿真精度     

Simulation of the Resin Film Infusion Process Based on the Finite Element Method

A physically accurate and computationally effective pure finite element method （FEM） was developed to simulate the isothermal resin infusing process. The FEM was based on conservation of resin muss at and instant of time and was objective of resin film infusion （RFI） fiber impregnation and mold filling . The developed computer code was able to simulate the resin infusing visually. A numerical example presented here demonstrated that compared with traditional finite element/ control-volume （FE/CV）, and FEM was physically accurate and computationally efficient.     

3-D direct current resistivity forward modeling by adaptive multigrid finite element method

Based on the fact that 3-D model discretization by artificial could not always be successfully implemented especially for large-scaled problems when high accuracy and efficiency were required, a new adaptive multigrid finite element method was proposed. In this algorithm, a-posteriori error estimator was employed to generate adaptively refined mesh on a given initial mesh. On these iterative meshes, V-cycle based multigrid method was adopted to fast solve each linear equation with each initial iterative term interpolated from last mesh. With this error estimator, the unknowns were nearly optimally distributed on the final mesh which guaranteed the accuracy. The numerical results show that the multigrid solver is faster and more stable compared with ICCG solver. Meanwhile, the numerical results obtained from the final model discretization approximate the analytical solutions with maximal relative errors less than 1%, which remarkably validates this algorithm.     

有限元分析中开挖释放荷载计算的讨论

针对采用有限元法进行开挖仿真分析中的释放等效荷载计算问题 ,比较了几种常见的计算方法 ,从有限元分析理论出发 ,给出了按单元积分计算开挖释放载荷的基本公式 ,这是一种方便的释放荷载计算方法 .还就目前开挖释放荷载计算中的一些问题提出了看法     

低速重载轴承的有限元分析及研究

以某炼钢厂转炉的耳轴轴承这类低速重载轴承为研究对象,针对低速重载轴承中各零件间接触问题进行分析,确定了合适的接触形式和算法,并建立其三维实体模型。采用有限元方法,计算出轴承各元件的应力和应变。将进一步修正得到耳轴轴承计算项隙,与实测轴承顶隙进行比较,其结果令人满意。     

Modeling and finite element analysis of rod and wire steel rolling process

Two thermomechanical coupled elastic-plastic finite element （FE） models were developed for predicting the 12-pass continuous rolling process of GCrl 5 rod and wire steel. The distances between stands in the proposed models were set according to the actual values, and the billets were shortened in the models to reduce the calculation time. To keep the continuity of simulation, a technique was developed to transfer temperature data between the meshes of different models in terms of nodal parameters by interpolation functions. The different process variables related to the rolling process, such as temperature, total equivalent plastic strain, equivalent plastic strain rate, and contact friction force, were analyzed. Also, the proposed models were applied to analyze the reason for the occurrence of an excessive spread in width. Meanwhile, it was also utilized to assess the influence of the roll diameter change on the simulated results such as temperature and rolling force. The simulated results of temperature are found to agree well with the measured results.     

有限元等参单元退化模式研究

针对结构分析中常遇到单元退化问题,研究二次等参单元的结点与形状退化形式,以及退化单元的收敛性.研究表明,退化单元是完备的,结点退化单元是协调的,形状退化单元是非完全协调的,即在包含了退化结点的边或面上变形是非协调的,其他边或面上变形是协调的.还对单元的应力协调性质作了详细讨论.     

Finite element analysis of rolling process for variable cross-section blade

Due to the variation ofthe blade cross-section, the deformation stress and strain of the workpiece keep changing during the rolling process and the conventional rolling theory is no longer valid. The complexity and diversity of the blade cross-section determine it impossible to establish an universal theoretical model for the rolling process. Finite element analysis （FEA） provides a perspective solution to the prediction. The FEA software DEFORM was applied to discovering the deformation, stress, strain and velocity field of the variable cross-section workpiece, and the effects of friction coefficient and rolling speed during the rolling process, which indicates that the average rolling force at friction coefficient of 0.4 is 6.5% higher than that at 0.12, and the rolling velocity has less effect on the equivalent stress and strain distribution, which would confer instructive significance on the theoretical study as well as the engineering practice.