Solidworks有限元分析教程

Define thermal conductivity at the contact area to model the properties of the glue between the chip and the substrate
线性静力分析：求解
Open “Thermal contact resistance_transistor.sldasm” Explode the model and set preferred units to “SI” and temperature units to “Kelvin” Define a thermal study “NoRes” Apply material “AISI 304” for “Voltage regulator” and “Copper” for Heat sink Define “Surface” contact with No resistance between the contact faces Apply convection to all the faces of the model except the contact faces
Hoop Stress (tangential):
Select “Axis1” and then define stress plot in Y-direction (radial to the axis). Select deformation scale=1 Right-click on the stress plot icon “plot2” and then select”List selected”
Cosmos/Works的用户界面
Cosmos/Works的工具条
从所选的特征 中选择面元 在几何模型 / 有 限元模型之间进 行切换显示 对当前专题进行计算 生成有限元网格 定义材料 定义、修改、删除专题
Cosmos/Works的选项对话框
Cosmos/Works线性静力分析
例1.支座分析 例2.轴承载荷 例3.壳单元，静水压 例4.Motion，远端载荷
录
结构优化：定义优化目标............................. 72 结构优化：定义优化变量............................. 73 结构优化：定义阀值函数............................. 74 结构优化：求解 ........................................... 75 结构优化：观察结果 .................................... 79
COSMOS/Works 屈服分析示例 ................. 13 COSMOS/Works 应用技巧的总结 .............. 13
模态分析：定义专题 ....................................13 模态分析：定义材料属性 .............................14 模态分析：网格划分 ....................................30 模态分析：定义约束 ....................................42 模态分析：定义载荷 ....................................47 模态分析：求解 ............................................54 模态分析：观察结果 ....................................55
前处理
建立分析对象的有限元模型
求解
对有限元模型的计算工况进行求解
后处理
观察分析结果，评估设计是否符合要求
Cosmos/Works有限元分析的步骤
1. 建立几何模型 2. 定义材料属性 修改, 重新, 细化 3. 定义边界条件(约束和载荷) 4. 划分网格 5. 求解 6. 查看和评估结果
Film coefficient = 250 W/(m^2.K) Bulk temperature = 298 K
线性静力分析：观察结果
Apply Heat power = 25 W for “Voltage regulator” Mesh with default settings and run the analysis Notice the temperature distribution of the heat sink

This problem requires large displacement nonlinear contact!!!
线性静力分析：定义约束
Define a new static study “LargeDisp” Drag’n drop the material and loads/bc folders from “small contact” study Right-click on the study name and click on properties. Select “Large displacement contact” option. Run the analysis Define a stress plot with scale factor = 1. Look at the contact area.
- Negative stress on “pole piece lower” (compression) - Positive stress on “pole piece upper” (tension)
线性静力分析：定Βιβλιοθήκη Baidu材料属性
Simulate parts which are separated by large gaps First run the model with small displacement option and look at the results If you see that there is a change in the orientation of the contact surfaces during loading or if the results doesn’t look realistic, use large deflection option
Example 1
Example 2
线性静力分析：网格划分
Open “RectangleGap.sldasm” Define a static study “smallcontact” Apply material “Alloy steel” to both parts Apply a pressure of 725 psi on the top face Select the two front faces and then apply restraint. Select Flat face option and then select “Normal to face” Fix the left semi-circular face Hide the loads/bc symbols Define “Surface” contact between the top face of the bottom leg and the perpendicular face Create mesh and run Define a stress plot with scale factor = 1. Look at the contact surface.
有限元分析用户培训
Jim.Yue DDS Software Co.
1
目
企业需求与有限元分析 ..................................3 有限元分析的主要步骤 ..................................3 COSMOS/Works 的 用户界面 ......................3 COSMOS/Works 的工具条 ...........................8 COSMOS/Works 的选项对话框 ....................9 COSMOS/Works 线性静力分析示例 ..........13
Looks real!!!
线性静力分析：定义载荷
Simulate heat resistance between parts for thermal analysis
Account for heat resistance of thin parts without actually modeling them!
COSMOS/Works 温度分析示例 ................. 13
线性静力分析：定义专题 .............................13 线性静力分析：定义材料属性 .....................14 线性静力分析：网格划分 .............................30 线性静力分析：定义约束 .............................42 线性静力分析：定义载荷 .............................47 线性静力分析：求解 ....................................54 线性静力分析：观察结果 .............................55
线性静力分析：定义专题
Displacement in the radial direction:
Select “Axis1” and then define displacement plot in Xdirection (radial to the axis). Select deformation scale=1 Right-click on the displacement plot icon “plot2” and then select”List selected”
COSMOS/Works 结构优化示例 ..................13
结构优化：定义专题 ....................................71
企业需求与有限元分析
更少的样机：省钱 更短的周期：省时 更好的质量：品质
Design Analysis
有限元分析的主要步骤
- Average displacement of “pole piece lower” = -0.0019504” (decrease
in radius) - Average displacement of “pole piece upper” = 0.007896 “ (increase in radius) - Sum of these 2 displacement = 0.009846” ~Initial interfernce of 0.01”
COSMOS/Works 模态分析示例 ..................13
温度分析：定义专题 .................................... 13 温度分析：定义材料属性............................. 14 温度分析：网格划分 .................................... 30 温度分析：定义约束 .................................... 42 温度分析：定义温度载荷 ............................. 47 温度分析：求解 ........................................... 54 温度分析：观察结果 .................................... 55