有限元分析作业报告 英文版

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

*名：***

学号：*********

指导教师：***

日期：2016.12.02

1.Question

Fig.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 displacement 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 is2.0×1011 N/m2, poisson's ratio is 0.3.

2.The software used

ANSYS Finite element software (APDL 15.0)

3.Solving process

Point 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 opposite to the Y-axis

3.1 The preparatory work before analysis

（1）Specify the new file name. Select Utility>Menu> File>Change 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 difinition of working file name.

（2）Specify a new title. Select Utility>Menu>File>Change 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 graphics window.Select Utility>Menu>Plot>Replot, the defined information was displayed in the graphics window.

（4）Define the structural analysis.Run the main menu Main Menu>Preferences，then choose the Structural, click OK to complete the definition of the analysis type , as shown in Fig.4.

Fig.4. The definition of the structural analysis.

3.2 Define the element type

Run the main menu Main Menu>Preprocessor>Element Type>Add, 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 finit 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 constants

Run the main menu Main Menu>Preprocessor>Real Constants Add, then pop-up the dialog