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
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 Nhomakorabea限元分析的主要步骤
▪ 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 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
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!
Define thermal conductivity at the contact area to model the properties of the glue between the chip and the substrate
▪ 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”
修改, 重新, 细化
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
- Negative stress on “pole piece lower” (compression) - Positive stress on “pole piece upper” (tension)
线性静力分析：定义材料属性
▪ Simulate parts which are separated by large gaps
▪ Right-click on the displacement plot icon “plot2” and then select”List selected”
- 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”
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 温度分析示例 ................. 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 COSMOS/Works 屈服分析示例 ................. 13 COSMOS/Works 应用技巧的总结.............. 13
properties. Select “Large displacement contact” option. ▪ Run the analysis ▪ Define a stress plot with scale factor = 1. Look at the contact area.
Looks real!!!
▪ 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
线性静力分析：定义专题
▪ Displacement in the radial direction:
▪ Select “Axis1” and then define displacement plot in X-direction (radial to the axis). Select deformation scale=1
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
有限元分析用户培训
Jim.Yue DDS Software Co.
1
目录
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 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 COSMOS/Works 模态分析示例..................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 COSMOS/Works 结构优化示例..................13 结构优化：定义专题 ....................................71
leg and the perpendicular face ▪ Create mesh and run ▪ Define a stress plot with scale factor = 1. Look at the contact
surface.
This problem requires large displacement nonlinear contact!!!
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