Solidworks有限元分析教程.ppt

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1、有限元分析用户培训有限元分析用户培训Jim.YueDDS Software Co.1目目 录录企业需求与有限元分析企业需求与有限元分析Design Analysis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.查看和评估结果修改,重新,细化Cosmos/Works的用户界面的用户界面Cosmos/Works的工

2、具条的工具条定义、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的选项对话框的选项对话框Cosmos/Works线性静力分析线性静力分析例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

3、deformation scale=1Right-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

4、 of 0.01”Hoop Stress(tangential):Select“Axis1”and then define stress plot in Y-direction(radial to the axis).Select deformation scale=1Right-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”(tensi

5、on)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 gapsFirst 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 doesnt look realistic,use large deflec

6、tion optionExample 1Example 1Example 2Example 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 partsApply a pressure of 725 psi on the top faceSelect the two front faces and then apply restraint.Select Flat face option and then sel

7、ect“Normal to face”Fix the left semi-circular faceHide the loads/bc symbolsDefine“Surface”contact between the top face of the bottom leg and the perpendicular faceCreate mesh and runDefine a stress plot with scale factor=1.Look at the contact surface.This problem requires large This problem requires

8、 large displacement nonlinear contact!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”Dragn drop the material and loads/bc folders from“small contact”studyRight-click on the study name and click on properties.Select“Large displacement contact”option.Run the a

9、nalysisDefine a stress plot with scale factor=1.Look at the contact area.Looks real!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

10、 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“Coppe

11、r”for Heat sinkDefine“Surface”contact with No resistance between the contact facesApply convection to all the faces of the model except the contact facesFilm coefficient=250 W/(m2.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

12、 run the analysisNotice the temperature distribution of the heat sinkDistributed Resistance:Define a new thermal study“DistRes”Dragn drop“Material”folder and Loads/Bc folder from NoRes study to DistRes studyEdit contact pair definition and define distributed resistance=0.005 K.m2/W Total resistance=

13、Distributed resistance X Contact area =0.005 X 0.0003392=14.7 K/WRun the study“DistRes”Notice the temperature distribution of the heat sinkThermal Contact Example(Contd)Probe the temperature valueDefine a thermal plot with meshRight-click the plot icon and select ProbePick all the nodes on the edge

14、of both the partsClick 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(Contd)Total Resistance:Define a new thermal study“TotalRes”Dragn drop“Material”folder and Loads/Bc folder from NoRes study to To

15、talRes studyEdit contact pair definition and define Total resistance=25 K/W Run the study“TotalRes”Notice the temperature distribution of the heat sinkLoad Simulation:Remote LoadsRemote LoadsDirect Transfer-Flexible surface-Applied as equivalent force&momentRigid Beam-Rigid surfaceRemote RestraintRi

16、gid connectionModel effect of a rigid virtual part between two facesForce/Moment from Motion Simulation at this point applied on the selected faceRemote Load ExampleOpen“RemoteLoadExample.sldasm”Define a static study“Remote”Apply material“Alloy steel”Fix the flat faceSelect“Coordinate system1”and th

17、e 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 folderAnimate the resultsCompare the plot results of“Remote”study with“Axial Tension”studyMotion Load Transfer Using Remote LoadsGo to SW Add-in and click“COSMOS/Motio

18、n”Open“LoadTransferModel_With_Result.sldasm”Play the animation and save the load file for frame#300Delete the motion resultsGo to CW menu,Import Motion Load and open this load file from“MotionLoadTransfer”directorySelect all the loads related to crank-1 and then click OK.Open the part“crank”Youll se

19、e that there is a new study“Frame-300”with motion loads transferred as remote loadsApply material“Plain carbon steel”Go to study properties and select“FFEPlus”solver and“Inertia relief option”Run the analysisWeb ReportsInclusion of report templates in the feature treeSaving of report settingAutomati

20、c creation of all plotsReport ExampleOpen“ReportExample.sldasm”New option save JPEG files(Right-click on the Study name)Right-click on Report and click definePoint to the logo file“ReportLogo.bmp”Point to the right stress AVI and VRML filesSelect option“Automatically update all plots in JPEG files”.

21、Click OK.You can also get a print versionMaterialSupports orthotropic material properties for solids and shells Option to use different Material library filesNew redesigned material browser utilityLicensingSingle license file for hardware lock&FlexLM securityNew License Administrator to manage the l

22、icenseSupport USB port hardware lockSupport redundant serversOther customer enhancementsAutomatically run analysis after meshingEdge pressure for shellsApply uniform temperature to componentsAutomatic adjustments of Max&min in plots on updateFFEPlus solver for thermal analysisIncrease the limit on number of modes for frequency analysis from 20 to 100Add symbol for gravity loadsImprove section clippingSave plots in JPEG formatImprove transient thermal animationsOption to switch between different languagesOthersThank You!30