ANSYS - Disks in Point Contact - Step 6 - Simulation - Confluence

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  Search Cornell SimCafe Home Edit Browse/Manage Login Search Simulation … ANSYS - Disks in Point C ontact - Step 6 ANSYS - Disks in Point Contact - Step 6 Added by stap_tech-mailbox@cornell.edu (Update Your Profile) , last edited by Steve Weidner on Oct 31, 2008 21:52 Problem Specification 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 res
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  Simulation>…>ANSYS - Disks in Point Contact - Step 6 SimCafe HomeBrowse/ManageLogin     Search  ANSYS - Disks in Point Contact - Step 6 Added bystap_tech-mailbox@cornell.edu (Update Your Profile), last edited bySteve Weidneron Oct 31, 2008 21:52 Problem Specification1. Start-up and preliminary set-up2. Specify element type and constants3. Specify material properties4. Specify geometry5. Mesh geometry 6. Specify boundary conditions 7. Solve8. Postprocess the results9. Validate the results Step 6: Specify boundary conditions As in previous tutorials, we'll apply the loads to the geometry rather than the mesh.One important change to note is that instead of applying force P to the lower disk, we'll constrainthe lower surface of the lower disk in the vertical (Y) direction in order to sufficiently constrain themodel and avoid rigid body motion. Search Cornell  Apply Symmetry Boundary Conditions We'll apply symmetry boundary conditions along the planes of symmetry. Main Menu > Preprocessor > Loads > Define Loads > Apply > Structural > Displacement >Symmetry B.C. > On Areas Select the four areas that define the planes of symmetry by clicking on them.Click OK  . The symbol s appears along these areas indicating that symmetry B.C.s have beenapplied.   Search  Apply Displacement Constraints Main Menu > Preprocessor > Loads > Define Loads > Apply > Structural > Displacement >On Areas This brings up the  Apply U,Rot on Areas pick menu. Select the bottom area of the lower disk(x-z plane). Click OK  .This brings up the  Apply U,Rot on Areas menu. Select UY for the DOFs to be constrained andenter  0 for the Displacement value . Click OK  . Apply Force Main Menu > Preprocessor >   Loads > Define Loads > Apply > Structural >Force/Moment > On Keypoints This brings up the  Apply F/M on KPs pick menu. Select keypoint 8 on the upper body and click OK  . This brings up the  Apply F/M on Keypoints menu. Select FY  for the Direction of force/mom . Enter  p/4 for  Force/Moment value and click OK  . A single red arrow denotesthe force and the direction in which it is acting. Note that we have divided the total force P=4500Nby four to account for the fact that only a quarter of the volumes are being modeled.  Apply Coupled BCs We will apply a coupled boundary condition to the upper area of the upper disk to ensure that allnodes attached to this area move equally as a result of the applied load. Utility Menu > Select > Entities Select  Areas from the pull-down menu at the top and By Num/Pick  below that. Select FromFull  below that. Click  Apply  .Hold down the left mouse button until area 6 is selected. Area 6 is the upper area (x-z plane) of theupper disk. Click OK  .Next we'll select the nodes attached to this area. In the Select Entities menu, select Nodes from the pull-down menu at the top and  Attached to below that. Select  Areas, All  below that.Click OK  .Verify that only nodes attached to area 6 are currently selected: Utility Menu > Plot > Nodes We'll now apply a coupled boundary condition to the selected nodes. Main Menu > Preprocessor > Coupling/Ceqn > Couple DOFs This brings up the Define Coupled DOFs pick menu. In the Input  window, ANSYS tells you to Pick or enter nodes to be coupled . Since we have already selected the nodes, click Pick All  .
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