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Video 7.7课程教案、知识点、字幕

同学们好

这一节我们将针对门型框架结构的

ANSYS有限元分析计算过程进行演示

首先,我们看这个门型框架

它包括了4个节点,3个梁单元

它的弹性模量,还有转动惯量还有面积

也如图给出

那我们进入ANSYS

我们将创建ANSYS的有限元模型

首先我们要定义单元

我们单元选择是beam3单元

接下来我们将定义beam3单元的实常数

它包括了面积6.8e-4平方米

惯性矩6.5e-7

然后我们将定义材料的弹性模量

它的弹性模量是3.0e11

它的泊松比我们在这里设为0

接下来我们将创建节点

1号节点x方向上的坐标是0

y方向坐标是0.96

2号节点x方向坐标是1.44

y方向是0.96

3号节点0,0

4号节点是1.44,0

基于节点,我们将创建单元

1号单元是由1号节点和2号节点组成

2号单元由1号节点和3号节点组成

3号单元是由2号节点和4号节点组成

有限元模型我们初步完成

接下来我们将定义边界条件

在边界条件中我们可以看到

3号和4号节点,它的所有方向的位移

x,y方向还有转动自由度

所有的位移都完全固支

也就是说这些变量都为0

我们在1号节点处施加

x方向上3000N的作用力

在1号单元处,我们将施加均布载荷为4167

这样我们就完成了整个的有限元建模过程

接下来我们进入求解

我们直接进行求解

我们的求解就完成了

我们进入后处理模块

我们来看门型框架结构在这样受力状态下的变形情况

我们就可以看出来

这是给出了整个门型框架的受力情况

如果我们希望得到它对应的

门型框架上这根梁的弯矩情况

我们来看一下

beam3单元,通过帮助看它的单元库

我们可以发现单元库中

beam3单元包括了i,j两个节点

其中它的弯矩是MMOMZ

那么它在后处理中应该是

对应这一行

我们看,i和j分别对应的是SMISC中的6号和12号

那么我们可以通过Element Table

直接定义对应的梁的弯矩

应该是6

我们假设这是m1

这是i节点处的弯矩

12号是j节点处的弯矩,假设这是m2

那么我们就可以显示出它对应的弯矩图

m1到m2,也就是说从节点i到j它对应的弯矩图

我们就可以得到对应的门型框架

它的弯矩图的分布情况

如果我们想知道对应的每个节点的变形情况

和前面我们用MATLAB计算的结果作对比

我们就可以通过List得到对应的位移量

我们可以看出来

1号节点和2号节点所计算出来的位移量

跟前面MATLAB所计算出来的位移量是一致的

我们也可以看出它对应的支反力情况

我们直接看它的弯矩情况

可以看到3号节点和4号节点对应的弯矩

和我们前面计算的结果是一致的

好的,我们就完成了门型框架有限元分析计算过程

谢谢大家

同学们,这一讲的内容就是这些

我们下一讲再见

Finite Element Method (FEM) Analysis and Applications课程列表:

0、Course summary

-Finite element, infinite capabilities

--Video

1、Introduction

-1.1 Classification of mechanics:particle、rigid body、deformed body mechanics

--Video 1.1

--1.1 Test

-1.2 Main points for deformed body mechanics

--Video 1.2

--1.2 Test

-1.3 Methods to solve differential equation solving method

--Video 1.3

--1.3 Test

-1.4 Function approximation

--Video 1.4

--1.4 Test

-1.5 Function approximation defined on complex domains

--Video 1.5

--1.5 Test

-1.6 The core of finite element: subdomain function approximation for complex domains

--Video 1.6

--1.6 Test

-1.7 History and software of FEM development

--Video 1.7

--1.7 Test

-Discussion

--Discussion

-Homework

2、Finite element method of bar system based on direct stiffness method

-2.1 Principles of mechanic analysis of springs

--Video 2.1

--2.1 Test

-2.2 Comparison between spring element and bar element

--Video 2.2

--2.2 Test

-2.3 Coordinate transformation of bar element

--Video 2.3

--2.3 Test

-2.4 An example of a four-bar structure

--Video 2.4

--2.4 Test

-2.5 ANSYS case analysis of four-bar structure

--Video 2.5

--ANSYS

-Discussion

--Discussion

3、Mechanical description of deformed bodies with complex geometry 1

-3.1 Mechanical description and basic assumptions for deformed body

--Video 3.1

--3.1 Test

-3.2 Index notation

--Video 3.2

--3.2 Test

-3.3 Thoughts on three major variables and three major equations

--Video 3.3

--3.3 Test

-3.4 Test

-3.4 Construction of equilibrium Equation of Plane Problem

--Video 3.4

-3.5 Test

-3.5 Construction of strain-displacement relations for plane problems

--Video 3.5

-3.6 Test

-3.6 Construction of constitutive relations for plane problems

--Video 3.6

-3.7 Test

-3.7 Two kinds of boundary conditions

--Video 3.7

- Discussion

-- Discussion

4、Mechanical description of deformed bodies with complex geometry 2

-4.1 Test

-4.1 Discussion of several special cases

--Video 4.1

-4.2 Test

-4.2 A complete solution of a simple bar under uniaxial tension based on elastic mechanics

--Video 4.2

-4.3 Test

-4.3 The description and solution of plane beam under pure bending

--Video 4.3

-4.4 Test

-4.4 Complete description of 3D elastic problem

--Video 4.4

-4.5 Test

-4.5 Description and understanding of tensor

--Video 4.5

-Discussion

--Discussion

5、Principle of trial function method for solving mechanical equations of deformed body

-5.1 Test

-5.1Main method classification and trial function method for solving deformed body mechanics equation

--Video 5.1

-5.2 Test

-5.2 Trial function method for solving pure bending beam: residual value method

--Video 5.2

-5.3 Test

-5.3How to reduce the order of the derivative of trial function

--Video 5.3

-5.4 Test

-5.4 The principle of virtual work for solving plane bending beam

--Video 5.4

-5.5 Test

-5.5 The variational basis of the principle of minimum potential energy for solving the plane bending

--Video 5.5

-5.6 Test

-5.6 The general energy principle of elastic problem

--Video 5.6

-Discussion

--Discussion

6、Classic implementation and finite element implementation based on trial function method

-6.1Test

-6.1 Classic method and finite element method based on trial function

--Video 6.1

-6.2 Test

-6.2 Natural discretization and approximated discretization in finite element method

--Video 6.2

-6.3 Test

-6.3 Basic steps in the finite element method

--Video 6.3

-6.4 Test

-6.4 Comparison of classic method and finite element method

--VIDEO 6.4

-Discussion

--Discussion

7、Finite element analysis of bar and beam structures

-7.1 Test

-7.1 Construction and MATLAB programming of bar element in local coordinate system

--Video 7.1

-7.2 Test

-7.2 Construction and MATLAB programming of plane pure bending beam element in local coordinate syste

--Video 7.2

-7.3 Construction of three-dimensional beam element in local coordinate system

--Video 7.3

-7.4 Test

-7.4 Beam element coordinate transformation

--Video 7.4

-7.5 Test

-7.5 Treatment of distributed force

--Video 7.5

-7.6 Case Analysis and MATLAB programming of portal frame structure

--Video 7.6

-7.7 ANSYS case analysis of portal frame structure

--Video 7.7

8、Finite element analysis of continuum structure (1)

-8.1 Test

-8.1 Two-dimensional 3-node triangular element and MATLAB programming

--Video 8.1

-8.2 Test

-8.2 Two-dimensional 4-node rectangular element and MATLAB programming

--Video 8.2

-8.3 Test

-8.3 Axisymmetric element

--Video 8.3

-8.4 Test

-8.4 Treatment of distributed force

--Video 8.4

-8.5 MATLAB programming of 2D plane rectangular thin plate

--Video 8.5

-8.6 Finite element GUI operation and command flow of a plane rectangular thin plate on ANSYS softwar

--Video 8.6

-Discussion

--Discussion

9、Finite element analysis of continuum structure (2)

-9.1 Three-dimensional 4-node tetrahedral element and MATLAB programming

--Video 9.1

-9.2 Three-dimensional 8-node hexahedral element and MATLAB programming

--Video 9.2

-9.3 Principle of the isoparametric element

--Video 9.3

-9.4Test

-9.4Numerical integration

--Video 9.4

-9.5 MATLAB programming for typical 2D problems

--Video 9.5

-9.6 ANSYS analysis case of typical 3Dl problem

--Video 9.6

-Discussion

--Discussion

10、Basic properties in finite element method

-10.1Test

-10.1Node number and storage bandwidth

--Video 10.1

-10.2Test

-10.2 Properties of shape function matrix and stiffness matrix

--Video 10.2

-10.3Test

-10.3 Treatment of boundary conditions and calculation of reaction forces

--Video 10.3

-10.4Test

-10.4 Requirements for construction and convergence of displacement function

--Video 10.4

-10.5Test

-10.5C0 element and C1 element

--Video 10.5

-10.6 Test

-10.6 Patch test of element

--Video 10.6

-10.7 Test

-10.7 Accuracy and property of numerical solutions of finite element analysis

--Video 10.7

-10.8Test

-10.8 Error and average processing of element stress calculation result

--Video 10.8

-10.9 Test

-10.9 Error control and the accuracy improving method of h method and p method

--Video 10.9

-Discussion

--Discussion

11、High-order and complex element

-11.1 Test

-11.1 1D high-order element

--Video 11.1

-11.2 Test

-11.2 2D high-order element

--Video 11.2

-11.3 Test

-11.3 3D high-order element

--Video 11.3

-11.4 Test

-11.4 Bending plate element based on thin plate theory

--Video 11.4

-11.5 Test

-11.5 Sub-structure and super-element

--Video 11.5

12、Introduction to the application of finite element analysis (1)

-12.1Test

-12.1 Finite element analysis for structural vibration: basic principle

--Video 12.1

-12.2 Test

-12.2 Case of finite element analysis for structural vibration

--Video 12.2

-12.3 Test

-12.3 Finite element analysis for elastic-plastic problems: basic principle

--Video 12.3

-12.4 Test

-12.4 Finite element analysis for elastic-plastic problems: solving non-linear equations

--Video 12.4

-Discussion

--Discussion

13、Introduction to the application field of finite element analysis (2)

-13.1 Test

-13.1 Finite element analysis for heat transfer: basic principle

--Video 13.1

-13.2 Test

-13.2 Case of finite element analysis for heat transfer

--Video 13.2

-13.3 Test

-13.3 Finite element analysis for thermal stress problems: basic principle

--Video 13.3

-13.4 Test

-13.4 Finite element analysis for thermal stress problems: solving non-linear equation

--Video 13.4

-Discussion

--Discussion

14、Project

-2D problem: finite element analysis of a 2D perforated plate

--Video I-1

-3D problem: meshing control of a flower-shaped chuck

--Video I-2

-Modal analysis of vibration: Modal analysis of a cable-stayed bridge

--Video I-3

-Elastic-plastic analysis: elastic-plastic analysis of a thick-walled cylinder under internal pressur

--Video I-4

-Heat transfer analysis: transient problem of temperature field during steel cylinder cooling process

--Video I-5

-Thermal stress analysis: temperature and assembly stress analysis of truss structure

--Video I-6

-Probability of structure: Probabilistic design analysis of large hydraulic press frame

--Video I-7

-Modeling and application of methods: Modeling and analysis of p-type elements for plane problem

--Video I-8

Video 7.7笔记与讨论

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