查询词典 finite

The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

主要完成研究内容和取得成果如下：(1)利用有限元软件计算出紧凑拉伸试样的裂纹尖端应力强度因子KI值，其结果与理论值一致，从而验证了利用ABAQUS计算裂纹尖端相关断裂参量的可行性；(2)在研究内聚应力等相关理论的基础上，推导出了研究尺度与材料弹性模量的近似关系，并确定了介观尺度上的弹性模量；(3)在宏观尺度上建立了全局有限元计算模型和子模型，得到了裂纹尖端应力应变场分布，结果表明利用子模型技术获得比较准确的裂纹尖端应力应变场分布是可行的；(4)在介观尺度上利用平均晶粒尺度的方式建立了裂纹沿晶扩展模型，得到了裂纹尖端断裂过程区的微观应力应变场；(5)当应力强度因子为30MPa.m1/2时，分析了介观尺度上在裂纹沿晶扩展过程中裂纹长度对Mises应力、最大主应力和应变的影响，结果表明，裂纹扩展长度对试样整体应力应变分布影响不大，而对裂纹尖端区域有较大影响；(6)介。。。

Extended penetrator ; baseline rod ; finite target ; numerical simulation ; finite element

伸出式侵彻体；基准杆；有限厚靶；数值模拟；有限元

The drawing and extruding problems are analyzed and calculated by means of the theory and finite element program in this paper. It has been proved that the theory of large strain elastic-plastic finite element and elastic-plastic hydrodynamic lubrication has a wide practice value.

应用本文的理论和有限元程序，分析和计算了拉拔和挤压实例，证实了有限变形弹塑性有限元法和弹塑性流体动力润滑理论在金属塑性成形领域中具有广泛的实用价值。

Then after a semi-rigid joint behavior can be modeled as a finite stiffness rotation spring, base on rotation and displacement equation derive the element stiffness matrixes with semi-rigid connections where the effects of jointed flexibility and shear forces in the connection deformations have been considered in and fixed-end forces are modified. Finally, a program for calculating system reliability of semi-ridge steel frames with Monte carlo method and finite element analysis has compiled for calculating and analyzing.

接着本文在介绍和分析半刚性连接弯矩和转角关系模型的基础上，用带有转动刚度的弹簧表征半刚性连接，推导出半刚性连接的刚度矩阵，对固端力进行修正，同时考虑了剪切变形的影响，编制了半刚接钢结构平面框架的有限元程序BHPFL，并在其基础上编制了基于蒙特卡洛法的Monte Carlo-BHPFL 有限元相结合的方法，进行体系可靠度的分析。

By considering the finite spread in beam longitudinal momentum and the effect of finite space-charge field of the electron beam,the dispersion relation of IRL instability is derived ,and the growth rate of IRL wave and the linear damping rate of the space-charge wave are also got.

利用动力学理论对一种新型自由电子激光──离子波纹激光进行了研究，考虑电子束的纵向动量离散和空间电荷场效应，导出了IRL不稳定性色散关系，求得了IRL辐射波的增长率及电子束空间电荷波的线性阻尼率，并对其进行了讨论，得到了一些结论。

However,most of the current numerical implementation are based on a hybrid finite - element/finite - difference/control - volume solution with the middle - plane model. This kind of model leads to great inconvenience in applications..

但目前的流动模拟软件都是采用基于&中性层&模型的有限元/有限差分/控制体积法来分析z1，所谓中性层是假想的位于模具型腔和型芯中间的层面，其模拟过程如图1所示。

The three-dimension solid and finite element model of the greatness pulsation bag style dust catcher structure,including middle case ,sieve pore,lower column,beam and ash bucket was built based general finite analytic software ANSYS.

基于有限元软件ANSYS建立了包括中箱体、花板、下立柱、横梁和灰斗等在内的某大型袋式除尘器结构的三维有限元模型，对除尘器结构强度进行了热力场仿真计算，给出了中箱体和灰斗的应力、应变等云图。

The first to use PRO / E software components establishment of the body (body, cylinder head, cylinder pad, cylinder liner, the main bearing caps, Flywheel carcasses, gear Connection Board Room, Shell pump, oil pan, about mounting frame, rear axle oil blocks, etc.) 3D solid model; Then use Hypermesh software division finite element mesh to ensure a good grid quality, and better coordination of the grid between quantity and accuracy of contradictions; Finally using ANSYS software components of a body finite element analysis.

首先利用PRO/E软件建立机体组件（机体、气缸盖、气缸垫、气缸套、主轴承盖、飞轮壳、齿轮室连接板、水泵壳体、油底壳、左右悬置支架、后轴油封盖等）的三维实体模型；然后利用Hypermesh软件划分有限元网格，保证了良好的网格质量，较好地协调了网格数量和计算精度之间的矛盾；最后利用ANSYS软件对机体组件进行了有限元分析。

This paper establishes a finite element model for the interaction between the soil and the sheet piles and performs a seismic response analysis for the portal water injection sheet pile adopting the nonlinear calculation module of finite element software ANSYS.

本文建立的有限元模型之间的互动，土壤和钣桩并进行地震反应分析，为门户注水板桩采用了非线性计算模块的有限元软件ansy

The forming process and the characteristics of plastic deformation, the sites of the heavily strained zones with severe thickness reduction and their evolution, the influences of the main processing parameters, such as the plastic melt pressure and its distribution from the gate to the end of the mold, and of friction coefficient between the sheet flange and the mold, on these during the hybrid forming of the aluminum sheet have been revealed by the updated Lagrange finite element formulation for the finite elastic-plastic deformation.

运用弹塑性大变形更新的Lagrange有限元方法，揭示了铝薄板的成形过程和塑性变形的特点与规律、大塑性变形区的产生位置及其塑性变形特点，探明了复合成型过程中塑料熔体压力及其分布规律以及铝薄板凸缘与模具摩擦系数等主要工艺参数对铝薄板成形过程和塑性变形的影响规律。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。