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1、目目 录录第1页/共30页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：品质第2页/共30页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第3页/共30页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,细化第4页/共30页Cosmos/Works的用户界面的用户界面第5页/共30页Cosmos/Works的工具条
2、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第6页/共30页Cosmos/Works的选项对话框的选项对话框第7页/共30页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，远端载荷第8页/共30页线性静力分析：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(radia
3、l to the axis).Select 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”
4、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=1Right-click on the stress plot icon“plot2”and then select”List selected”Negative stress on“pole piece lower”(compression)Positive stress on“pole p
5、iece upper”(tension)第9页/共30页线性静力分析：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 r
6、ealistic,use large deflection optionExample 1Example 1Example 2Example 2第10页/共30页线性静力分析：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.Se
7、lect Flat face option and then select“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 re
8、quires large displacement nonlinear This problem requires large displacement nonlinear contact!contact!第11页/共30页线性静力分析：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“
9、Large displacement contact”option.Run the analysisDefine a stress plot with scale factor=1.Look at the contact area.Looks real!Looks real!第12页/共30页线性静力分析：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 the
10、m!Define thermal conductivity at the contact area to model the properties of the glue between the chip and the substrate第13页/共30页线性静力分析：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“
11、NoRes”Apply material“AISI 304”for“Voltage regulator”and“Copper”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第14页/共30页线性静力分析：观察结果线性静力分析：观察结果Appl
12、y Heat power=25 W for“Voltage regulator”Mesh with default settings and 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 defin
13、ition and define distributed resistance=0.005 K.m2/W Total resistance=Distributed resistance X Contact area =0.005 X 0.0003392=14.7 K/WRun the study“DistRes”Notice the temperature distribution of the heat sink第15页/共30页Thermal Contact Example(Contd)Probe the temperature valueDefine a thermal plot wit
14、h meshRight-click the plot icon and select ProbePick all the nodes on the edge 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 第16页/共30页Thermal Contact Example(Contd)Total Resistance:Define a new ther
15、mal study“TotalRes”Dragn drop“Material”folder and Loads/Bc folder from NoRes study to TotalRes studyEdit contact pair definition and define Total resistance=25 K/W Run the study“TotalRes”Notice the temperature distribution of the heat sink第17页/共30页Load Simulation:Remote LoadsRemote LoadsDirect Trans
16、ferFlexible surfaceApplied as equivalent force&momentRigid BeamRigid surfaceRemote RestraintRigid connectionModel effect of a rigid virtual part between two facesForce/Moment from Motion Simulation at this point applied on the selected face第18页/共30页Remote Load ExampleOpen“RemoteLoadExample.sldasm”De
17、fine a static study“Remote”Apply material“Alloy steel”Fix the flat faceSelect“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 folderAnimate the resultsCompare the plot results of“Remote”stud
18、y with“Axial Tension”study第19页/共30页Motion 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#300Delete the motion resultsGo to CW menu,Import Motion Load and open this load file from“Mo
19、tionLoadTransfer”directorySelect all the loads related to crank-1 and then click OK.Open the part“crank”Youll see 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 opt
20、ion”Run the analysis第20页/共30页Web ReportsInclusion of report templates in the feature treeSaving of report settingAutomatic creation of all plots第24页/共30页Report ExampleOpen“ReportExample.sldasm”New option save JPEG files(Right-click on the Study name)Right-click on Report and click definePoint to the
21、 logo file“ReportLogo.bmp”Point to the right stress AVI and VRML filesSelect option“Automatically update all plots in JPEG files”.Click OK.You can also get a print version第25页/共30页MaterialSupports orthotropic material properties for solids and shells Option to use different Material library filesNew
22、 redesigned material browser utility第26页/共30页LicensingSingle license file for hardware lock&FlexLM securityNew License Administrator to manage the licenseSupport USB port hardware lockSupport redundant servers第27页/共30页Other customer enhancementsAutomatically run analysis after meshingEdge pressure f
23、or 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 languagesOthers第28页/共30页29Thank You!第29页/共30页感谢您的观看。第30页/共30页