Introduction to ANSYS LS-DYNA

Transcription

1 Lecture 12 Introduction to ANSYS LS-DYNA Extension 14.5 Release Introduction to ANSYS LS-DYNA 2012 ANSYS, Inc. November 8, Release 14.5

2 What is ANSYS LS-DYNA Extension ANSYS LS-DYNA in Workbench Very powerful for geometry modeling and mesh generation Extremely easy to setup contact and boundary conditions Capability of design optimization Have to start three different user interfaces for pre-processing, solving, and post-processing ACT (Application Extension Toolkit) Easy to use and comprehensive toolkit for performing customization within ANSYS Mechanical Become full release in R ANSYS, Inc. November 8, Release 14.5

3 What is ANSYS LS-DYNA Extension ANSYS LS-DYNA Extension: ANSYS LS-DYNA integrated with ACT Interface Single user interface that integrates pre-processing, solving, and postprocessing together Much convenient and easy to use Partnered with LSTC in its development Available after R14.5 release Work with existing ANSYS LS-DYNA license User can customize user interface to expand its features by themselves with the least amount of work, when they have ACT development license from ANSYS 2012 ANSYS, Inc. November 8, Release 14.5

4 Start ANSYS LS-DYNA Extension In ANSYS R14.5 Workbench, Extension is added into the pull-down menu Click on Extension and then Install Extension to browse to the file LSDYNA.wbex and install ANSYS LS-DYNA Extension 2012 ANSYS, Inc. November 8, Release 14.5

5 Start ANSYS LS-DYNA Extension Click on Extension again and then Manage Extension In Extension Manager, check the box of LSDYNA and then Close to load the extension ANSYS LS-DYNA system will be added under Analysis System in Workbench Toolbox as a new system. See next slide ANSYS, Inc. November 8, Release 14.5

6 Start ANSYS LS-DYNA Extension To create an ANSYS LS-DYNA project Drag and drop ANSYS LS-DYNA system to Project Schematic Or double click on ANSYS LS-DYNA system 2012 ANSYS, Inc. November 8, Release 14.5

7 Start ANSYS LS-DYNA Extension Workshop 8 Soft Ring Impact in the ANSYS LS-DYNA Training course is used to demonstrate the use of ANSYS LS-DYNA Extension In the Workshop 8, Keyword Snippet is used to Change the contact type Increase the slave penalty stiffness So over-penetration could be prevented between the soft and the hard materials Using ANSYS LS-DYNA Extension, slave penalty stiffness can be specified directly in user interface. No need to use Keyword Snippet ANSYS, Inc. November 8, Release 14.5

8 Model Setup in ANSYS LS-DYNA Extension In Engineering Data, add a new material Soft 2012 ANSYS, Inc. November 8, Release 14.5

9 Model Setup in ANSYS LS-DYNA Extension In Geometry, load the geometry file of soft ring and hard wall Double click on Model to open the model 2012 ANSYS, Inc. November 8, Release 14.5

10 Model Setup in ANSYS LS-DYNA Extension ANSYS LS-DYNA Extension Pre and Post Toolbar 2012 ANSYS, Inc. November 8, Release 14.5

11 Overview of the Extension Toolbar Pre-processing toolbar For each Part in the model Specify different Section properties such as element formulations Specify different Hourglass Controls Define Airbag, not available in R14.5 Include more contact definitions and Constraints Define Results Trackers for Time History plot Post-processing toolbar Enable ASCII output plot More options will be added into the toolbar in future 2012 ANSYS, Inc. November 8, Release 14.5

12 Model Setup in ANSYS LS-DYNA Extension Complete definition of geometry 2012 ANSYS, Inc. November 8, Release 14.5

13 Model Setup in ANSYS LS-DYNA Extension Under Step Controls of Analysis Settings, change End Time to 5E-4 s More options are available Memory Allocation, HPC Switching analysis type, single/double precision, units Specify global damping Specify global hourglass control Specify global control if model has ALE parts Specify output control 2012 ANSYS, Inc. November 8, Release 14.5

14 Model Setup in ANSYS LS-DYNA Extension Under Output Controls of Analysis Settings Change Calculate Results At to Equally Spaced Points Change Value to 100 Under Time History Output Controls of Analysis Settings Change Calculate Results At to Equally Spaced Points Change Value to 10 Change Output to Global Data 2012 ANSYS, Inc. November 8, Release 14.5

15 Model Setup in ANSYS LS-DYNA Extension Right click on Analysis Settings to apply Fixed Support boundary condition to the Wall More boundary condition types are available Fixed Rotation Elastic Support Nodal Force Nodal Displacement Temperature Convection Heat Flux Radiation Not available in R ANSYS, Inc. November 8, Release 14.5

16 Model Setup in ANSYS LS-DYNA Extension Right click on Initial Condition to insert Velocity and scope it to Ring X Component = 0 m/s Y Component = 200 m/s Z Component = -150 m/s 2012 ANSYS, Inc. November 8, Release 14.5

17 Model Setup in ANSYS LS-DYNA Extension Right Click on Solution and then Insert Deformation and Total Save the project Click on Solve to run the simulation 2012 ANSYS, Inc. November 8, Release 14.5

18 Solve Output under Solution Information 2012 ANSYS, Inc. November 8, Release 14.5

19 Solve Output under Solution Information Contains the following information LS-DYNA version number and your system information Initialization details Warning messages Error messages Time step size and other cycle details Timing information If these is a problem with your model, look at the Solver Output first to diagnose the problem If you need to submit a Service Request to ANSYS Technical Support, make sure the Solver Output (or files d3hsp and messag) is attached to the Service Request 2012 ANSYS, Inc. November 8, Release 14.5

20 Post-Processing Results in the LS-DYNA Extension Plot Total Deformation, observe the over-penetration Over-Penetration 2012 ANSYS, Inc. November 8, Release 14.5

21 Model Setup in ANSYS LS-DYNA Extension Under Connections and then Contacts, create Frictionless Ring To Wall with Top as the Shell Face Suppress Body Interaction Right click on ANSYS LS-DYNA and then insert Contact Properties Change Contact to Frictionless Ring To Wall Change Type to Forming Change Slave Penalty Scale Factor to 10 Change Master Penalty Scale Factor to 1 Click on Solve to re-run the analysis 2012 ANSYS, Inc. November 8, Release 14.5

22 Post-Process Solution: No Over-Penetration 2012 ANSYS, Inc. November 8, Release 14.5

23 Post-Process Solution: Time History In LSDYNA Post tool bar, click on ASCII and then Global Data Global Data will be inserted under Solution Click on Tabular Data in the details of Global Data Click on the symbol in the Tabular Data to add a new line 2012 ANSYS, Inc. November 8, Release 14.5

24 Post-Process Solution: Time History Click on the yellow field to see the list and then select the variable, for example, Kinetic Energy Click on the symbol and then the yellow field again to add more variables such as Total Energy, Internal Energy, Hourglass Energy, and External Work to Tabular Data Click on Apply to plot time history of these variables 2012 ANSYS, Inc. November 8, Release 14.5

25 Post-Process Solution: Time History Click on Worksheet on the top tool bar to show the time history plot 2012 ANSYS, Inc. November 8, Release 14.5