Femap实例-中面建模及多载荷集分析

Introduction

In this exercise, you will generate a midsurface model of a machined bracket. The steps to complete this exercise are:

•Import geometry

•Generate and edit midsurfaces

•Assign mesh attributes, set mesh sizing and mesh the bracket

•Create constraints and loads, including combined load sets

•Analyse the bracket using a Multi-set analysis and view the stress results.

Step 1:Import geometry

Import the Parasolid geometry of the multi-thickness solid model.

•Open a new FEMAP model.

•Select the File, Import, Geometry command.

•Select the Parasolid file ex13-Bracket_inches.x_t from your class Geometry folder.

•Click OK to accept the defaults in the Solid Model Read Options dialog box.

Change the view orientation to the Trimetric view.

•Press the F8key (or use the View, Rotate, Model command) to open the View Rotate dialog box.

•Select the Isometric button.

•Click OK to close the dialog box.

Save the model

•Save the model in your class Exercises folder as “ex13-Bracket.modfem”.

Step 2:Create midsurfaces

Extract the midsurfaces from the solid.

•Select the Geometry, Midsurface, Automatic

command.

•Click the Select All button to select all the surfaces on the solid.

•In the Mid-Surface Tolerance dialog box, click the Measure Distance icon to enable measuring a 3-D

distance. Ctrl+D can also be used to measure a

distance from the graphics window while in a

command.

•When the Locate –Define Location to Measure From dialog box is displayed, select one of the points on

the thickest edge of the sold. Set the Method to On

Point and select one of the points shown below.

•Click OK to confirm the selection of the first point.

•Select the “other” point shown below that has not been chosen, then click OK to confirm the selection.

•Click OK to accept the calculated distance, .156 in the Mid-Surface Tolerance dialog box. FEMAP will

now extract the mid-surfaces.

Display the automatically generated Midsurfaces group.

•In the Model Info pane, turn on “highlighting” by clicking the Show When Selected icon.

•Expand the Group object in the tree and select

1..Midsurfaces in the Model Info pane. This will

highlight the newly created group. Since we are only

working with a single part, you can delete the group

and the original solid.

•Right-click 1..Midsurfaces and select Delete from the context-sensitive menu.

•Expand the Geometry object in the Model Info tree, select 1..ex12-Bracket, and using the context-

sensitive menu, Delete the original solid part.