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Ansys_tutorials - Problem Specification Determine the force...

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Problem Specification Determine the force in each member of the following truss. Indicate if the member is in tension or compression. The cross-sectional area of each member is 0.01 m, the Young's modulus is 200x10 9 N/m 2 and Poisson ratio is 0.3. 4m 1m 2m A B C 4 kN
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Solution The solution in ANSYS for this and subsequent tutorials is divided into the nine steps listed below. Note that you'll need to follow these same nine steps for solving almost any problem in ANSYS or a comparable finite-element analysis package. 1. Start-up and preliminary set-up 2. Specify element type and constants 3. Specify material properties 4. Specify geometry 5. Mesh geometry 6. Specify boundary conditions 7. Solve! 8. Postprocess the results 9. Validate the results Step 1: Start-up & preliminary set-up Create a folder Create a folder called Ansys at a convenient location. We'll use this folder to store files created during the session. Start ANSYS Start > All Programs > ANSYS 11.0 > ANSYS Product Launcher In the window that comes up, enter the location of the folder you just created as your Working directory by browsing to it. If you specify, say, C:\Ansys as your working directory , all files generated during the ANSYS run will be stored in this directory . Specify truss_2d as your Initial jobname . The jobname is the prefix used for all files generated during the ANSYS run. For example, when you perform a save operation in ANSYS, it'll store your work in a file called truss_2d.db in your working directory.
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For this tutorial, we'll use the default values for the other fields. Click on Run . The ANSYS interface consists of the following: Utility Menu : Note that the jobname truss_2d appears in parenthesis in the title bar of the Utility Menu. ANSYS Main Menu : We'll more or less work our way down the Main Menu as we go through the solution steps. ANSYS Graphics This is the window where the geometry, mesh, applied boundary conditions, and results such as stress values are displayed.
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ANSYS Toolbar: The Toolbar contains shortcuts to often used commands such as save and can be customized by the user for convenience. ANSYS 11.0 Output Window: This is the window to which output from ANSYS commands is written and which provides feedback on the actions taken by ANSYS as you navigate the menus. If, at some point, you are not sure you clicked the right button or entered a value correctly, this is where to look first to figure out what you just did. Set Preferences We'll more or less work our way down the Main Menu . Main Menu > Preferences
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In the Preferences for GUI Filtering dialog box, click on the box next to Structural so that a tick mark appears in the box. The effect of selecting the structural preference is that only menu options applicable to structural mechanics are shown in the graphical user interface; options related to other disciplines such as thermal, fluid and electromagnetics are grayed out. This helps a little while navigating the vast menu options within ANSYS.
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