FemapV11复合材料建模分析

Introduction

In this exercise, you perform a linear stress analysis of a composite laminate fitting. The steps you will perform in this workshop are:

∙Import a Femap Neutral File with geometry edits for meshing already applied

∙Create two layups for the fitting – one for the normal thickness of the fitting and a second for reinforced areas around the

mounting holes

∙Create properties for the two layups

∙Mesh the fitting

∙Assign material directions to the mesh

∙Apply constraints and loads to the fitting

∙Analyze the fitting and review results

Step 1:Start Femap and Import Parasolid Geometry of the Fitting

Start Femap

∙From either a desktop icon, or from the Windows Start menu, select the icon for Femap v11.

Set your Femap preferences for the correct Geometry Scale Factor.

The Geometry Scale Factor is number of length units per

meter used by Parasolid.

∙Select the command, File > Preferences.

∙In the Preferences dialog box, select the Geometry/Model tab.

∙Under the Geometry Preferences option group, set the Geometry Scale Factor to Millimeters.

∙Click OK to apply the changes and close the dialog box.

Import a Femap Neutral file with the fitting geometry editing for meshing and with mesh sizing already applied.

∙Select the command, File, Import, Femap Neutral.

∙In your workshop folder, select the Parasolid file,

Fitting.NEU.

∙In the Neutral File Read Options dialog box, click OK to read in the fitting.

Your Femap model should appear as below.

In this model, the green surfaces represent 5 mm offsets from the holes modeled as washers and the orange surfaces represent pads around the holes. These areas will be meshed with a thicker laminate than the rest of the fitting. Mesh sizes have also been preset for this model, with a default mesh size of 5.

There are also three (3) additional coordinate systems that will be used to set material orientations. Display of points, coordinate systems and nodes are turned off in the current view.

Save the model.

∙Click the Save Model icon on the Model toolbar to execute the File > Save command.

∙In the File, Save As dialog box, navigate up one folder to select the Exercises folder.

∙Enter laminate-fitting as the name of the Femap model file.

The .modfem extension for Femap models will be

automatically appended to the name.

∙Click Save to complete saving the Femap model file.

Step 2:Create two layups for the fitting – one for the

normal thickness of the fitting and a second for

reinforced areas around the cutout and the

mounting holes

Save your Femap model.

Create a new 2D orthotropic material using a prepeg fabric.

∙Using the Model Info pane, right-click on the Material object and select new.

∙In the Create Material dialog box, click the Type button and select Orthotropic (2D) in the Material Type dialog box.

Click OK to confirm your selection.

You will now select a fabric from a material library provided with this workshop.

∙Click the Load button in the Define Material dialog box.