ANSYS Customization. Mechanical and Mechanical APDL. Eric Stamper. Presented by CAE Associates

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1 ANSYS Customization Mechanical and Mechanical APDL Presented by Eric Stamper 2011 CAE Associates

2 Introduction CAE Associates Inc. Engineering consulting firm since ANSYS consulting, custom software development and training. Sales and support network for ANSYS. One of the first 5 support distributors of ANSYS. Headquartered in Middlebury, CT. Website: 2

3 Customization Options This presentation includes examples by CAE Associates. ANSYS customization examples are provided in the areas below: Mechanical APDL Running ANSYS through Excel GUI Customization User Elements User Material Laws Workbench Project Page Mechanical GUI 3

4 Mechanical APDL Customization Running ANSYS from Excel 2011 CAE Associates

5 Mechanical APDL Customization Customer is not familiar with ANSYS, but wants to run ANSYS analyses. Excel interface drives design inputs and post-processes ANSYS results. ANSYS & Excel Communication Excel interface Provide Inputs in Excel Press Run Button in Excel Call Visual Basic Write out ANSYS input file VBA runs ANSYS and monitors process ANSYS writes out results data to a text file. VBA reads in ANSYS data after process ends 5

6 Mechanical APDL Customization Stand alone Excel sheet uses embedded Visual Basic and APDL scripts to run the design and analysis process. The Excel sheet can be used to force a user to follow a QA process where the analysis setup and results were checked against specific criteria. Design Inputs Run ANSYS Analysis Settings & Material Properties 6

7 Mechanical APDL Customization ANSYS runs are recorded within Excel. Desired results written out by ANSYS and summarized in Excel. Seamless communication between Excel and ANSYS data. ANSYS Results ANSYS Results 7

8 Mechanical APDL Customization SAP Translator GUI 2011 CAE Associates

9 Building Collapse Simulation An analysis of the World Trade Center collapse was to be performed in ANSYS; however all the models were in SAP (a general FEA code used in the civil industry). A translator was written entirely in Tcl-Tk due to the way it handles array information matching closely to the format of a SAP file. Translates the cross sections with offsets, end releases, shells and model data into ANSYS. z y SAP ANSYS 9

10 Mechanical APDL Customization Legacy SAP model translation into ANSYS SAP Model Translated ANSYS Model 10

11 Mechanical APDL Customization User Defined Failure Elements 2011 CAE Associates

12 Mechanical APDL Customization l l The World Trade Center building model consisted of several floors, each having hundreds of member connections. Modeling the detail of each connection would not be reasonable, however the temperature dependent failure modes and sequences of members and connections in a floor needed to be included. 12

13 Mechanical APDL Customization ANSYS does not have an element capable of capturing these types of failure modes Custom elements were created to simulate the loss of connection resistance after failure either from exceeding the connection force capacity or from exceeding the allowable deformation (for example, truss walking off the seat). 13

14 Mechanical APDL Customization Custom Material Law 2011 CAE Associates

15 Mechanical APDL Customization Bone remodeling is a natural, lifelong process in which old bone is absorbed and replenished by new bone. The bone density is strongly influenced by the level of mechanical stimulus it receives. A lack of stimulus will weaken the bone, therefore after an implant is in place, the load should be evenly distributed. Customized finite element simulations were developed to evaluate long term, bone-implant interaction by characterizing bone density changes in hip and knee replacement. Initial conditions of bone density obtained from patient DEXA (dual energy x-ray absorptiometry) scans. 15

16 Mechanical APDL Customization CAE Associates incorporated a bone remodeling algorithm into ANSYS via the USERMAT material model user-subroutine. This algorithm is a material law that characterizes how bone density changes over time as a result of load path changes between the pre and post-operative stress/strain state in the bone. This nonlinear, iterative approach uses a remodeling signal based on the strain energy density to predict changes in bone density as a function of position and time. The modulus of each element was changed each iteration, resulting in varying strain energy and bone density over time. One output generated by the bone remodeling analysis procedure included the ability to perform virtual DEXA plots of the bone density at a given time to facilitate direct bone density comparisons to clinical data 16

17 DEXA Plot A DEXA plot is a grayscale 2D contour plot that represents the average density of the bone. 17

18 DEXA Plot DEXA plot example via ANSYS bone remodeling analysis. Bone model shown with 3D density contour. DEXA plot using 2 mm grid, 100 points along rays. 18

19 Mechanical Customization Material Import GUI 2011 CAE Associates

20 Workbench Customization Users that have ANSYS APDL formatted material properties may want to be able to import them into Workbench in an automated way. A python script was used to convert the data from APDL into a XML formatted file. The XML file is then imported into WB. 20

21 Workbench Customization The material import script is called from a Project Page button. APDL material libraries are read in from a directory and listed. 21

22 Workbench Customization Data will be added to the Engineering Data of the currently highlighted system. If an Engineering Data item does not exist for the System or no System is currently selected, a new Engineering Data Standalone system will be created. 22

23 Workbench Customization Material names and properties imported into Engineering Data Ti1 Material Properties for Ti1 23

24 Mechanical Customization Queue Batch Solving of Mechanical Models with External Software 2011 CAE Associates

25 Workbench Customization RSM can be used to queue and manage the solving of ANSYS jobs; however some customers may want to use their own queuing software. The interaction between Workbench and an external queuing software can be managed with a custom script. 25

26 Workbench Customization Submit Mechanical job to run in external batch queuing system (not RSM). Mechanical Model File Batch Queuing Control File and Parameters 26

27 Workbench Customization Exported Mechanical APDL model along with parameter file for batch queuing software. Python and Jscript automatically submits files to queuing software. 27

28 Mechanical Customization Add Icons to GUI for Commonly Used Scripts 2011 CAE Associates

29 Mechanical Customization Custom scripts can be assigned to buttons and added into the Mechanical GUI Tool bars and Menu Bars. The buttons are created through a XML add-in that runs a JScript upon loading the Mechanical GUI. Clicking on a button calls a user created JScript. 29

30 Mechanical Customization Example: A Tool bar button is used to call script that creates named selections of all surfaces in the model. Used to improve geometry creation within FE Modeler. FE Modeler can build geometry from nodal components. A deformed mesh from a Mechanical simulation can be turned into CAD geometry through this process. 30

31 Mechanical Customization Combine CAD Attributes 2011 CAE Associates

32 Mechanical Customization CAD attributes are imported into Mechanical per body. The same one attribute name assigned in CAD therefore transfers over into multiple attributes all with the same name. CAD attributes with repeated names 32

33 Mechanical Customization A script can be used to form one named selection of all similarly named CAD attributes CAD attributes grouped into one named selection 33

34 Mechanical Customization Setting User Defaults 2011 CAE Associates

35 Mechanical Customization The Mechanical GUI provides the user input to set various defaults, however not all settings within the GUI can be set. 35

36 Mechanical Customization Using scripting, any setting within the Mechanical GUI can become a user default. For example, the following global mesh controls are always set to: Shape Checking = Standard Mechanical Automatic Mesh Based Defeaturing = ON 36

37 Mechanical Customization As a best practice, it might be preferred to always use custom settings. A customer can always start an analysis with company approved defaults. This can be accomplished with an add-in that calls a Jscript upon the first time Mechanical is opened. This example script keys off the geometry attach action to track the first time Mechanical is opened. A session variable is saved in the project afterwards, which ensures the script is not called again due to a geometry update. 37

38 Mechanical Customization The Jscript is attached to an action call back in Mechanical that prompts the user if theyd like to accept the custom default settings. 38

39 Thank You! 2011 CAE Associates

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