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Workbench Simulation Structural Nonlinearities 11 0 2 26 2007 2007 ANSYS Inc All rights reserved Workbench 11 0 ANSYS Inc Proprietary Inventory 002415 WS4A 1 Metal PlasticityMetal Plasticity Workshop4 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 2 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Goal Introduce a nonlinear metal plasticity material to the same large deflection model from workshop 2A and compare contrast results Model Description 3D large deflection of spring plate Spring plate Ductile steel Loads and Boundary Conditions Fixed support 3 Mpa Pressure load at opposite end Workshop 4 Metal plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 3 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Steps to Follow Start an ANSYS Workbench session Browse for and open Spring ws02A wbdb Workbench Projects file This project contains a Design Modeler DM geometry file Spring ws02A agdb and a Simulation S file Spring ws02A dsdb Highlight the the Model Small Deflection Linear Mat l Spring ws02A dsdb file and open a Simulation Session Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 4 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Highlight the Small Deflection Linear Mat l Branch and duplicate this Branch with RMB Duplicate Change the new branch name to Large Deflection Non Linear Mat l Add metal plasticity Highlight Geometry Solid branch Activate Nonlinear Material Effects YES Click on Structural Steel Select Edit Structural Steel Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 5 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis From the Engineering Data Tab Select Add Remove Properties From Add or Remove Properties Dialogue Activate Bilinear Isotropic Hardening Plasticity OK Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 6 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Click on the ICON to the right of Bilinear Isotropic Hardening Define Yield Strength of 250Mpa and a Tangent Modulus of 10 000Mpa Select Close Curve Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 7 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis In Details of Analysis Settings Branch and set up the following solution control specifications Number of Steps 2 For Current Step 1 Auto Time Stepping On Initial Substeps 1 Minimum Substeps 1 Maximum Substeps 1 Weak Springs Off Large Deflection On For Current Step 2 Auto Time Stepping On Initial Substeps 10 Minimum Substeps 5 Maximum Substeps 100 Weak Springs Off Large Deflection On Note This will be run as a two step solution Load step 1 zero pressure load This null solution enables graphing force vs deflection curve starting from zero Load Step 2 Pressure 3Mpa Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 8 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Define Pressure over two load steps Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 9 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Highlight Solution Branch and insert the following additional items for post processing Equivalent Plastic Strain Force Reaction Location Method Boundary Condition Boundary Condition Fixed Support Execute Solve Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 10 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis This last solution run can take up to two minutes depending on machine Review the Solution Convergence History as before It now takes 45 iterations in nine substeps including one bisection Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 11 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Review the displacement stress and strain results and compare with the linear run Note Total Deformation is considerably large due to the onset of localized yielding near the support Workshop 4 Metal Plasticity 2 26 2007 2007 ANSYS Inc All rights reserved Inventory 002415 WS4A 12 Workbench Simulation Structural Nonlinearities ANSYS Inc Proprietary Workshop Supplement Nonlinear Structural Analysis Plot Force vs Deformation From Utility Menu Insert New Chart Table In the details of Chart insert 2 objects into Outline Selection Total Deformation Force Reaction Change X Axis to Total Deformation Max Define X and Y axis labels as Deformation and Force respectively Output Quantites Omit all but Total Deformation Max Force Reaction