查询词典 fem

In order to reasonably depict four basic problems with friction, one Coulomb friction new form in first Kirchhoff stress is proposed to deal with finite deformation problems, other Coulomb friction form in incremental mode to elastoplastic flow theory; Hilbert function spaces concerning elastoplastical problems with friction are established, so it makes all operations and calculations in the treatise standardized within the scope of reasonably topologic structure; In view of functional extremum, the equivalence between generalized variational inequalities principles in elastoplasticity with friction and corresponding basic problems are testified by inducing Lagrangian multipliers, so it provides a rationally theoretical basis for numerical methods in elastoplasticity with friction; From the viewpoint of variational inequality, the theory of generalized variational inequalities in elasticity and elastoplasticity with frictional constraint is studied, and the uniqueness and existence of the solution of FEM is proofed under the proposed conditions of stress compatibility, and them FEM approximation and a discrete solution are discussed; Based on the principles of generalized variational inequalities in elastoplasticity with friction, direct generalized variational inequalities methods is pretended, which is a natural generalization and development of direct variational methods; Using generalized variational inequalities methods, some examples in metal forming including plane deformation, upset and extrusion are analyzed and the results prove that all the theories and methods in the paper are right, feasible, accurate and advanced.

主要内容有：为了合理地描述金属塑性成形中摩擦约束弹性、弹塑性基本问题，提出和研究了有限变形下以Kirchhoff第一应力表示的Coulomb摩擦定律形式和弹塑性流动理论下以增量形式表示的Coulomb摩擦定律表示形式；系统建立了摩擦约束弹塑性问题的Hilbert函数空间，使本文规范在一个具有合理的代数拓扑结构内进行一切操作和运算；利用Lagrange乘子，从泛函极值的角度系统地阐述和论证了一系列摩擦约束弹性、弹塑性广义变分不等原理与相应的实际问题之间的等价性，它为处理摩擦约束的弹塑性力学数值方法提供了合理的理论基础；从变分不等式的角度出发，阐述了对应于摩擦约束弹性、弹塑性问题的广义变分不等式理论，首次提出了在应力相容性条件下，它的有限元解具有存在唯一性，进而讨论了其有限元近似及离散解法；基于摩擦约束弹塑性广义变分不等式原理，首次提出了直接广义变分不等式方法，这一方法是直接变分法的合理推广和发展；利用直接广义变分不等式方法对金属压力加工中的平面变形问题、镦粗、挤压等塑性成形问题进行了分析计算，验证了该理论和数值算法的正确性、实用性、精确性和优越性。

FEM equation of fluid-solid coupled vibration was consisted by analyzing FEM equation of incompressible viscosity fluid and elastomer.

通过对弹性体振动的有限元方程和不可压缩粘性流体的有限元方程的分析，建立了弹性体与粘性流体流固耦合的有限元方程。

Then through dynamical analysis, every instantaneous acceleration distributing of slope under dynamical earthquake can be got too. According to this result, adding earthquake force to structure by way of inertial force, this paper analyses the slope stabilization by using FEM strength reduction method and gains every instantaneous safety factor and its corresponding slide. Curves of safety factors versus duration can be made by curvefitting. By safety factors versus duration curves and slides, we can value structure's quakeproof stabilization and point its slide out. By these principles, programs of FEM stabilization analysis for each moment are organized.

首先通过三维非线性有限元静力分析得到动力分析的初始应力，再进行动力分析得出边坡在动力作用下每一瞬时的加速度分布，根据每一瞬时的加速度分布的结果，将地震作用力作为惯性力加在结构上，用有限元强度折减法进行边坡稳定分析，得出在地震动力作用下每一瞬时的安全系数及对应滑裂面，拟合可得到一条安全系数随时间变化的曲线，根据这条安全系数时程曲线及滑裂面，综合得出结构的抗震稳定安全系数及对应的滑裂面。

In the hybrid algorithm, we use FEM to model the EM field in the interior domain, and then use the integral equation to compute the field on the boundary (to provide an artificial boundary condition for FEM system), and the finite element approximation is also convenient for deriving discrete equations of the integral equation.

混合法的原理是引入一个包围非均匀目标体的虚构边界，在边界内部的场用有限元法模拟，在边界外部的场用积分方程表达，二者在边界上通过场的连续性耦合起来。

The shape function of FEM based interpolation function is presented according to the FEM theory.

与传统的四面体剖分插值相比较，该方法能够更好地采样数据分布的细节。

The subroutine library of POWER-FEM was added to ANSYS as user element. So POWER-FEM can be fully utilized by ANSYS.

采用有限变形理论对ANSYS定义的应变、应力与物体真实应力之间的关系、位形、不平衡力的几何非线性计算等方面进行了分析。

Analyzed on the tunnels that used EPB method in different soils, the more logical three-dimensional finite element model is based, which can reality represented the soil transfiguration. 3 Due to the engineering example, a 3D FEM simulation model was founded. The model was used to study the rules of soil deformation and surface settlement during shield tunneling. 4 The characteristics of loess include the module, conglutination force and inner friction angle of the loess, affected the soil deformation. 5 The influence factors to the surface settlements such as the depth of soil, the outer diameter of the shield tunnel, the released stress at the cutting face, the fill ratio of the shield tail void, pouring-slurry press, thrusts and lengths of shield and digging steps were studied using the FEM method. References is brought forward in the loess areas of Xi'an was proposed.

通过对不同土质条件下盾构法进行地铁隧道施工的有限元分析，全面反映盾构推进对土体变形的影响情况； 3根据有关勘测资料，建立合理的盾构法施工三维非线性有限元模型，对盾构法施工引起的地层变位和地表位移情况进行计算，分析了盾构施工引起的地层变形规律和地面沉降规律； 4研究了黄土特性(地基模量、粘聚力和内摩擦角)对盾构法施工中土体变形的影响； 5利用三维有限元对盾构施工过程中影响地面沉降的因素(覆土厚度、隧道外径、开挖面压力变化量、注浆压力、盾尾空隙填充率、开挖步长、盾构机的长度和推进力等)进行研究，为今后西安地区地铁的建设提供参考。

Thirdly, with FEM analysis software ANSYS, this paper has fulfilled appropriate pavement FEM models. Selecting right loading locations and parameters, this paper has simulated contact behaviors of limited dimension cement concrete pavement with joints afterwards. The mechanics response results and load transfer ability results of matchboard joints have obtained and the effect of reinforcing steel bars has gained too.

3利用大型通用有限元分析软件ANSYS，建立合理的路面模型，选择合适的荷载位置和荷载参数，模拟有限尺寸设接缝水泥混凝土路面的接触行为，得到水泥混凝土路面的力学性能和接缝传荷能力等结果，并考虑了有无钢筋对路面性能的影响。

Based on the rigid viscoplastic finite element method FEM theory , the bimetal extrusion process in a non steady state was analysed by FEM with frictional elements inserted between two contacting materials .

基于刚粘塑性有限元理论，在双金属相互接触的两种材料之间引入摩擦单元，对双金属挤压的非稳态过程进行了有限元分析。

Combined genetic algorithms with domain decomposition parallel FEM, designed parallel FEM evolutionary displacement back analysis algorithm, developed corresponding program- GAParal-lelFEM3D(version 1.0)using C++.

把遗传算法和区域分解并行有限元算法结合，设计了进化并行有限元位移反分析算法，采用Visual C++开发了进化并行有限元位移反分析计算软件GAParallelFEM3D(v1.0)。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。