Solidworks有限元分析教程

null有限元分析用户培训有限元分析用户培训Jim.Yue DDS Software Co.目 录目 录企业需求与有限元分析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：品质有限元分析的主要步骤有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Cosmos/Works有限元分析的步骤建立几何模型 定义材料属性 定义边界条件(约束和载荷) 划分网格 求解 查看和评估结果Cosmos/Works的用户界面Cosmos/Works的用户界面Cosmos/Works的工具条Cosmos/Works的工具条定义、修改、删除专题定义材料生成有限元网格对当前专题进行计算在几何模型 / 有限元模型之间进行切换显示从所选的特征中选择面元Cosmos/Works的选项对话框Cosmos/Works的选项对话框Cosmos/Works线性静力分析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，远端载荷线性静力分析：定义专题线性静力分析：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 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” 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” Negative stress on “pole piece lower” (compression) Positive stress on “pole piece upper” (tension)线性静力分析：定义材料属性线性静力分析：定义材料属性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 1Example 2线性静力分析：网格划分线性静力分析：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. This problem requires large displacement nonlinear contact!!!线性静力分析：定义约束线性静力分析：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.Looks real!!!线性静力分析：定义载荷线性静力分析：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线性静力分析：求解线性静力分析：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 Film coefficient = 250 W/(m^2.K) Bulk temperature = 298 K线性静力分析：观察结果线性静力分析：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 Distributed Resistance: Define a new thermal study “DistRes” Drag’n drop “Material” folder and Loads/Bc folder from NoRes study to DistRes study Edit contact pair definition and define distributed resistance = 0.005 K.m^2/W Total resistance = Distributed resistance X Contact area = 0.005 X 0.0003392 = 14.7 K/W Run the study “DistRes” Notice the temperature distribution of the heat sinkThermal Contact Example (Cont’d)Thermal Contact Example (Cont’d)Probe the temperature value Define a thermal plot with mesh Right-click the plot icon and select Probe Pick all the nodes on the edge of both the parts Click on the Plot icon to view the temperature variation from the top face of the voltage regulator to the bottom of the heat sink Thermal Contact Example (Cont’d)Thermal Contact Example (Cont’d)Total Resistance: Define a new thermal study “TotalRes” Drag’n drop “Material” folder and Loads/Bc folder from NoRes study to TotalRes study Edit contact pair definition and define Total resistance = 25 K/W Run the study “TotalRes” Notice the temperature distribution of the heat sink Load Simulation: Remote LoadsLoad Simulation: Remote LoadsRemote Loads Direct Transfer Flexible surface Applied as equivalent force & moment Rigid Beam Rigid surface Remote Restraint Rigid connection Model effect of a rigid virtual part between two faces Force/Moment from Motion Simulation at this point applied on the selected faceRemote Load ExampleRemote Load ExampleOpen “RemoteLoadExample.sldasm” Define a static study “Remote” Apply material “Alloy steel” Fix the flat face Select “Coordinate system1” and the end face of the cantilever. Define remote load of 10N in the X direction. Create mesh and run. Double-click on “Plot1” under the stress folder Animate the results Compare the plot results of “Remote” study with “Axial Tension” study Motion Load Transfer Using Remote LoadsMotion Load Transfer Using Remote LoadsGo to SW Add-in and click “COSMOS/Motion” Open “LoadTransferModel_With_Result.sldasm” Play the animation and save the load file for frame # 300 Delete the motion results Go to CW menu, Import Motion Load and open this load file from “MotionLoadTransfer” directory Select all the loads related to crank-1 and then click OK. Open the part “crank” You’ll see that there is a new study “Frame-300” with motion loads transferred as remote loads Apply material “Plain carbon steel” Go to study properties and select “FFEPlus” solver and “Inertia relief option” Run the analysisPostprocessing: Results in local CSPostprocessing: Results in local CSPlotting Listings Reaction forcesPostprocessing: Exploded viewsPostprocessing: Exploded viewsPlot results on SolidWorks exploded views Postprocessing: New toolsPostprocessing: New toolsImproved probing with graphing option List results by EntityWeb ReportsWeb ReportsInclusion of report templates in the feature tree Saving of report setting Automatic creation of all plotsReport ExampleReport ExampleOpen “ReportExample.sldasm” New option save JPEG files (Right-click on the Study name) Right-click on Report and click define Point to the logo file “ReportLogo.bmp” Point to the right stress AVI and VRML files Select option “Automatically update all plots in JPEG files”. Click OK. You can also get a print versionMaterialMaterialSupports orthotropic material properties for solids and shells Option to use different Material library files New redesigned material browser utility LicensingLicensingSingle license file for hardware lock & FlexLM security New License Administrator to manage the license Support USB port hardware lock Support redundant servers Other customer enhancementsOther customer enhancementsAutomatically run analysis after meshing Edge pressure for shells Apply uniform temperature to components Automatic adjustments of Max & min in plots on update FFEPlus solver for thermal analysis Increase the limit on number of modes for frequency analysis from 20 to 100 Add symbol for gravity loads Improve section clipping Save plots in JPEG format Improve transient thermal animations Option to switch between different languages Others… Thank You!Thank You!