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H. Kim FEA Tutorial

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ABAQUS/CAE Tutorial: Analysis of an Aluminum BracketHyonny Kim

last updated: August 2004

In this tutorial, youll learn how to:1. 2. 3. 4. 5. 6. Sketch 2D geometry & define part. Define material properties. Apply loads and boundary conditions. Mesh. Run analysis. View results.

H. Kim FEA Tutorial

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Helpful Tips Before Getting StartedUse Exceed 9.0 or equivalent PC terminal software. HELP Online help manuals: abaqus_aae doc & - there is a book for CAE: ABAQUS/CAE User's Manual. Context sensitive help is also available within CAE. CAE creates the .inp file which you can edit and run by the command line, or you can submit jobs from within CAE. Other files are .cae (CAE model file), .odb, .dat, .log, .msg, and .sta. The .dat is the text output file that will contain results. The .odb file is the binary output file that will be read during post-processing to view graphical results. The .log file keeps a text record of all processes and is useful for checking the status of the analysis. The .msg lists the progress of the analysis, as well as provides some messages about why an analysis might have crashed (this information is often within the .dat file as well). The .sta file is a summary of the information contained in the .msg file, and is useful for monitoring the status of long-running jobs during their computation. MOUSE Use of the Mouse: button 1 (left) is select, button 2 (right) gives menu, button 3 (middle, if available is enter or done) multiple items can be selected by: dragging a window or holding the SHIFT key while picking items can be de-selected by holding the CTRL key.

H. Kim FEA Tutorial

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ABAQUS/CAE: Getting Started, Create Part To run ABAQUS/CAE, first go to the directory you wish your files to be located, then type: abaqus_aae cae or /usr/site/aae/bin/abaqus_aae cae click Create Model Database In the Module dropdown box, select Part (this takes about 30 seconds for the program to initialize) Note the locations of: Tool Bar, Menu Bar, Toolbox Area, Prompt Area. These will be referred to repeatedly in the future. In the Toolbox Area, click Create Part button. The Create Part window will pop up. Enter in name, e.g., bracket Under Modeling Space, choose 2D Planar Base Feature, Shell Approximate size: 20 click Continue

H. Kim FEA Tutorial

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Sketch Part The window will change to that shown at right. Note the buttons pointed out. Buttons with a dark triangle will provide more button choices when clicked and held. Try it. Float your mouse pointer over buttons, it will give a pop-up description. Context-Sensitive Help is available. Click the help button, then the item you want more info on.

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Click Create Lines button. Note it is highlighted when active. In prompt area, enter in the coordinates:1. 2. 3. 4. 5. 6. 7. 0, 0 8, 0 (it is ok if point is be out of view) 8, -12 5, -12 5, -3 0, -3 click on point 1 (box will appear on it). Finished product will be yellow outline of the bracket. Click Auto-Fit View button to re-scale image. The other buttons adjacent to this one will adjust panning, rotation, and zoom. Try them out. Dynamic viewing with mouse buttons by holding CTRL + ALT on right side of keyboard. Try it.

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Click Create Circle button. Enter 6.5, -1.5 for center, and 7.25, -1.5 for perimeter point. Click Create Fillet button (go to next page)

H. Kim FEA Tutorial

Abaqus User Manual

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Sketch Part contd.3. contd enter 1.0 for fillet radius in the Prompt Area, hit enter, then Mouse click on inner two lines when prompted. The Create Fillet button should still be highlighted. Click this again to get the screen shown below left. Click the Done button in the Prompt Area at the bottom of the screen. You now are returned to the Part Module screen. This should look like the screen below right. Note different tool buttons shown in the Toolbox Area.

H. Kim FEA Tutorial

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Partition Edge Click the Partition Edge: Enter Parameter button. In order to get this button, you need to click and hold over the line partitioning tools button note the small dark triangle in the lower right corner indicates that this is an expanding button. You will be prompted to select an edge, select the far righthand edge of the bracket. Click Done. In the Prompt Area, enter in value of 0.25 for the Normalized edge parameter. Click the Create Partition button to finish. You will see a large dot onefourth of the way up the edge of the bracket. This partitioned edge will be used later for applying a uniform load.

H. Kim FEA Tutorial

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Saving and Defining Material Properties Save your work: in the Menu Bar, click File, Save As. Under Selection, enter a name at the end of the path, e.g. bracket. Click OK. From now on, you can just click the blue floppy disk icon in the Tool Bar. Save often!!!

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Change Modules. In the Module drop-down box beneath the Tool Bar, select Property. Click Create Material Buttonenter a name, e.g. Aluminum, select Mechanical --> Elasticity --> Elastic enter 10e6 for Youngs Modulus, 0.3 for Poissons Ratio. click OK If you want to modify the material, click the Material Manager button to the right of Create Material, select the material by name and click Edit, or click Dismiss to leave without making any changes.

H. Kim FEA Tutorial

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Assign Properties to Regions of Model2. Click Create Section Button enter a name, e.g., plate choose Solid and Homogeneous click Continue select the material Aluminum (or what ever you named it, there should be only one to choose from) in the drop down box enter Plane stress/strain thickness: 0.05. Click OK. you will be prompted to select a region. Click on the part. Click the Done button in the Prompt Area at the bottom of the screen. The Assign Section window will pop up. Select the Section Name you wish to assign to this region (there should be only one which youve previously named, e.g., plate) click OK.

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Click Assign Section Button

H. Kim FEA Tutorial

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Instance Part Change Modules. In the Module drop-down box beneath the Tool Bar, select the Assembly. note, the Canvas (main working graphical window) will be blank.

Click the Instance Part button. The Create Instance window will pop up. Select the part you wish to instance, e.g., the part we named bracket previously. A red outline of the bracket will show. Click OK.

H. Kim FEA Tutorial

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Step Change Modules. Select the Step module. Click the Create Step button. Create Step window pops up enter a name use the default name Step-1. be sure Procedure type is set to General, and Static, General is highlighted in the list. Click Continue.

Edit Step window pops up, with the Basic tab active. enter in a Description, e.g., apply loading under Increment Size, enter value of 0.1 for Initial. Leave the rest the same. Full load corresponds to an Increment value of 1 (when Time Period is set to 1 under the Basic tab). Setting Initial to 0.1 forces ABAQUS to start the analysis by applying 1/10 of the full load. This can also be left to default 1 value and the software will auto-select. click OK.

Click the Incrementation tab.

H. Kim FEA Tutorial

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Load Change Modules. Select the Load module. Click the Create Load button. the Create Load window pops up. enter a Name, e.g., Load-1 is the default name be sure Step-1 (or what name you have given it) is selected in the Step drop down box.