Workshop 2 Workbench Simulation Basics Workshop 2 Workbench

Workshop 2 Workbench - Simulation Basics

Workshop 2 – Workbench - Simulation Basics Notes on Workshop 2 Workshop Supplement • Throughout these workshops menu paths are documented as: “First pick > Second pick > etc. ”. • Workshops begin with a goals section followed by an assumptions section. ANSYS Workbench - Simulation • The first workshop is extensively documented. As this course progresses, students will become more familiar with basic Workbench Simulation functionality (menu locations etc. ), thus subsequent workshops will contain less details. August 26, 2005 Inventory #002266 WS 2 -2

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Goals • Problem statement: – The model consists of a Parasolid file representing a control box cover (see figure). The cover is intended to be used in an external pressure application (1 Mpa/145 psi). – The cover is to be made from aluminum alloy. – Our goal is to verify that the part will function in its intended environment. ANSYS Workbench - Simulation • Using the Stress Wizard, set up and solve a structural model for stress, deflection and safety factor. Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -3

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Assumptions – Frictionless supports place a normal constraint on an entire surface. Translational displacement is allowed in all directions except into and out of the supported plane. Since we would expect frictional forces to at contact areas this is a conservative approach. ANSYS Workbench - Simulation • We will represent the constrains on the counter bores, bottom contact area and inner sides using frictionless supports. Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -4

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Start Page From the launcher start Simulation. • Choose “Geometry > From File. . . “ and browse to the file “Cap_fillets. x_t”. • When Workbench - Simulation starts choose “Structural Branch” under Outline Branch Macros, “Ductile Materials” under “New Structural Simulation” and click Run. ANSYS Workbench - Simulation • Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -5

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Environment Workshop Supplement ANSYS Workbench - Simulation • Loads: the load consists of a 1 MPa pressure applied to the 17 exterior surfaces of the cover. August 26, 2005 Inventory #002266 WS 2 -6

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Environment Workshop Supplement – Note: the use of all frictionless surfaces will trigger the message shown here: – Workbench Simulation automatically places weak springs on structural models where the potential of rigid body motion exists. An inspection of the boundary conditions on this model should confirm that rigid body motion is prevented. In this case the weak springs have no effect on the results. • This is an informational warning that the model should be inspected. It does NOT indicate the solution is invalid. ANSYS Workbench - Simulation • Supports: As described earlier frictionless supports are applied on 3 different regions of the model. – The weak spring feature can be configured on/off by the user. August 26, 2005 Inventory #002266 WS 2 -7

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Preprocessing Workshop Supplement 1. From the main menu go to “Units > Metric (mm, Kg, N, °C, s). ANSYS Workbench - Simulation Setup working unit system: August 26, 2005 Inventory #002266 WS 2 -8

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing Workshop Supplement • Notice that verifying and changing material automatically highlighted the part branch in the tree. ANSYS Workbench - Simulation 2. From the Simulation Wizard choose “Verify Material”. Locate the “Material” detail field and choose to “Import…” > “Aluminum Alloy”. August 26, 2005 Inventory #002266 WS 2 -9

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing Workshop Supplement 3. Select 1 surface (choice is arbitrary). 4. Click “Extend to Limits” to select the remaining 16 surfaces. 4 ANSYS Workbench - Simulation Loads: Select the 17 exterior surfaces of the cover. To simplify selection 3 August 26, 2005 Inventory #002266 WS 2 -10

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing 5. Choose “Insert Loads” from the Sim. Wiz. 6. Structural > Pressure. 7. Enter a Magnitude of 1 Mpa in the Details window. 5 6 7 ANSYS Workbench - Simulation Loads Continued: Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -11

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing Workshop Supplement 8. Select the 4 counter bore surfaces (figure below shows 1). 9. Choose “Insert Supports” from the Sim. Wiz. 10. Structural > Frictionless Support 10 8 9 ANSYS Workbench - Simulation Supports (counter bores): August 26, 2005 Inventory #002266 WS 2 -12

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing 11. Select one of the inside surfaces of the bottom recess. Click the “Extend to Limits” button to add the remaining 7 surfaces to the selection set (8 total). 12. Choose “Insert Supports” from the 11 Sim. Wiz. 13. Structural > Frictionless Support 13 ANSYS Workbench - Simulation Supports (inner sides): Workshop Supplement 12 August 26, 2005 Inventory #002266 WS 2 -13

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Preprocessing 14. Select the surface at the bottom of the recess. 15. Choose “Insert Supports” from the Sim. Wiz. 16. Structural > Frictionless Support 14 15 16 ANSYS Workbench - Simulation Supports (bottom): Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -14

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Solution Workshop Supplement The callout will direct you to the solve icon at the top of the GUI. Alternately you could right click on any branch in the tree and choose “solve”. 17 ANSYS Workbench - Simulation 17. From the Sim. Wiz choose “Solve”. August 26, 2005 Inventory #002266 WS 2 -15

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Results Workshop Supplement ANSYS Workbench - Simulation 18. From the Sim. Wiz choose “View Results”. The call out will direct you to the Solution branch. Selecting various results branches will cause that result to be plotted (see next page). 18 August 26, 2005 Inventory #002266 WS 2 -16

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Results Workshop Supplement ANSYS Workbench - Simulation • Plotting a model’s deformation often provides a “reality check” in structural analysis. Verifying the general nature (direction and amount) of deflection can help avoid obvious mistakes in model setup. Animations are often used as well. August 26, 2005 Inventory #002266 WS 2 -17

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Results Workshop Supplement ANSYS Workbench - Simulation • After reviewing stress results expand the safety tools and plot safety factors and margins. Notice both failure theories predict a minimum safety factor of < 1. August 26, 2005 Inventory #002266 WS 2 -18

Workshop 2 – Workbench - Simulation Basics Workshop 2 - Report • At this point simply choose “Generate Report” to review the default setup. ANSYS Workbench - Simulation • To create an html report first click the “Report Preview” tab. The customization page allows you to set up the report. Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -19

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Report • Notice at this point there are no graphic images. Return to the “Geometry” tab to insert figures. ANSYS Workbench - Simulation • When the report generation is complete scroll through the report and review its contents. Workshop Supplement August 26, 2005 Inventory #002266 WS 2 -20

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Report Workshop Supplement • Next right click and insert a figure. • The next time the report is generated the figures will be included. ANSYS Workbench - Simulation • Choose the graphical items you wish to include in your report by first highlighting the branch and orienting the plot. August 26, 2005 Inventory #002266 WS 2 -21

Workshop 2 – Workbench - Simulation Basics . . . Workshop 2 - Report Workshop Supplement • Figures are not limited to results items. Adding a plot of the environment branch, for example, will include an image of model boundary conditions in the Report. • Figures are independent. You may set up individual figures and have their orientation, zoom level, etc. retained regardless of the active model orientation or other figures. • Individual branches can have multiple figures associated with them. ANSYS Workbench - Simulation Notes on Figures: August 26, 2005 Inventory #002266 WS 2 -22