有限元作业报告英文版

1、有限元分析及应用上机实验报告 学 院：机电工程学院专 业： 机械工程班 级：硕士1606班姓 名： 钱树生学 号： 163712160指导教师： 李毅波日 期： 2016.12.02 - 9 -1. QuestionFig.1. Schematic diagram of herringbone roof truss.Question: The geometric dimensions of the chevron roof is shown in Fig.1,you should analyze it by statics，as a result you should give the dis

2、placement and axial force and axial force diagram of the deformation diagram.Conditions: The ends of the roof truss were fixed, the sectional area of the truss is 0.01m2, elastic modulus is2.01011 N/m2, poissons ratio is 0.3.2. The software usedANSYS Finite element software (APDL 15.0)3. Solving pro

3、cessPoint 1 was choosed as the Coordinate point, horizontal to the right was the X axis，the upright direction is choosed as the Y axis to create a coordinate system. The nodes was numbered as shown in Figure 1，node 1 and node 5 was fixed，and the force on node 6,7,8 was is 1k N，the direction is oppos

4、ite to the Y-axis3.1 The preparatory work before analysis （1）Specify the new file name. Select UtilityMenu FileChange Jobname, then pop-up the dialog box Change Jobname, input the the working file name 2D-sp in the Enter New Jobname, click OK to finish the difinition, as shown in Fig.2.Fig.2. The di

5、finition of working file name.（2）Specify a new title. Select UtilityMenuFileChange Title，then pop-up the dialog box Change Title, input the the file name 2D-sp pro in the Enter New Title, click OK to finish the difinition, as shown in Fig.3.Fig.3. The difinition of file name.（3）Re-refresh the graphi

6、cs window. Select UtilityMenuPlotReplot, the defined information was displayed in the graphics window.（4）Define the structural analysis. Run the main menu Main MenuPreferences，then choose the Structural, click OK to complete the definition of the analysis type , as shown in Fig.4.Fig.4. The definiti

7、on of the structural analysis.3.2 Define the element typeRun the main menu Main MenuPreprocessorElement TypeAdd, then pop-up the dialog box Element Types, click the button Add to build a new element type, then pop-up the dialog box Library of Element Types, choose Link first, and then select 3D fini

8、t stn 180（Link1），click the button OK to finish the definition of the element type, click the button Close to finish the settings, as shown in Fig.5.Fig.5. The definition of the element type.3.3 Define the real constantsRun the main menu Main MenuPreprocessorReal Constants Add, then pop-up the dialog

9、 box of real constants, click the button Add to come into the constant input dialog box, as shown in Fig.6. Input the sectional area of the truss (0.01m2) in AREA, click the button OK to finish the input of the real constants, as shown in Fig.7.Fig.6. Get into the instance constant dialog box.Fig.7.

10、 The definition of the real constants.3.4 Define the material propertiesRun the main menu Main MenuPreprocessorMaterial PropsMaterial Models, then pop-up the dialog box of material properties, and select Structure、Linear、Elastic、Isotropic, as shown in Fig.8.When the selection was completed, appeared

11、 the Material Properties input dialog box appears，then input elastic modulus 2e11 and the poissons ratio 0.3, as shown in Fig.9, click OK to finish the input of the material properties.Fig.8. Get into the setting of material properties.Fig.9. The difinition of the material properties.3.5 Establish t

12、he analytical model（1）Create the nodes. The coordinates of the 18 nodes as shown in Table.1. Run the main menu Main MenuPreprocessor ModelingCreateNodesIn Active CS. The create node entry dialog box appears as shown in Fig.10. Input the first node 1 and its x, y, z coordinate, then click Apply to fi

13、nish the creating of the node. Similarly, create the nodes 28, click OK to finish the creating of the nodes, as shown in Fig.10.Table.1.The coordinates of geometry model nodes. Nodes12345678Coordinates(0, 0, 0)(2, 0, 0)(4, 0, 0)(6, 0, 0)(8, 0, 0)(6, 1, 0)(4, 2, 0)(2, 1, 0)Fig.10. The dialog box of n

14、odes input.Fig.11. The creation of the nodes.The created nodes as shown below：（2）Created the bar unit Run the main menu Main MenuPreprocessorModelingCreate ElementsAuto NumberedThru Nodes, then pop-up the dialog box Element from Nodes, pick the nodes 1 and 2, click Apply to complete the first lever

15、unit . Similarly, pick both ends of the rod in turn, click Apply to complete the lever unit, lastly click OK, as shown in Fig.12.Fig.12. Model establishment of the herringbone truss.3.6 Apply constraints and loads（1）Impose constraints Run the main menu Main MenuSolutionDefine LoadsApplyStructural Di

16、splacementOn Nodes, the pick menu appears, select nodes 1 and 5 in turn, then click OK, the constraint definition dialog box appears，as shown in Fig.13. Choose All DOF to constrain all degrees of freedom，other items by default，then click the button OK to complete the constraint definition.Fig.13. Im

17、pose the constraints.（2）Apply the load Run the main menu Main MenuSolutionDefine LoadsApplyStructural Force/MomentOn Nodes, the pick menu appears, select nodes 6, 7 and 8 in turn, click OK , then the load definitions dialog box appears，as shown in Fig.14. The load type is concentrated force FY. The

18、value is -1000 , Then click the OK button to complete the application of the load.Fig.14. The application of the load.Figure after load application as shown below:3.7 SolutionRun the main menu Main MenuSolutionSolveCurrent LS, then pop-up the dialog box Solve Current Load Step, click STAT Command, t

19、hen click STAT CommandFileClose toclose the STAT Command window, then click OK to finish the steps.Then the computer started the solution. The promption of Solution is done indicated that the solution was completed, click the button Close to finish the solution, as shown in Fig.15. Fig.15. The process of the solution.3.8 View the analysis results（1）Define the cell table. In ANSYS, some data can not be directly accessed, so we need to complete the definition of cell to access the results.Run the main menu Main MenuGeneral