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Release 11.0 Documentation for ANSYS
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1. Introduction
1.1. Overview of Steps in an Explicit Dynamic Analysis
1.2. Commands Used in an Explicit Dynamic Analysis
1.3. A Guide to Using this Document
1.4. Where to Find Explicit Dynamics Example Problems
1.5. Additional Information
2. Elements
2.1. Solid and Shell Elements
2.1.1. SOLID164
2.1.2. SHELL163
2.1.3. PLANE162
2.1.4. SOLID168
2.2. Beam and Link Elements
2.2.1. BEAM161
2.2.2. LINK160
2.2.3. LINK167
2.3. Discrete Elements
2.3.1. COMBI165 Spring-Damper
2.3.2. MASS166
2.4. General Element Capabilities
3. Analysis Procedure
3.1. Build the Model
3.1.1. Define Element Types and Real Constants
3.1.2. Specify Material Properties
3.1.3. Define the Model Geometry
3.1.4. Mesh the Model
3.1.5. Define Contact Surfaces
3.1.6. General Modeling Guidelines
3.2. Apply Loads and Obtain the Solution
3.2.1. Loads
3.2.2. Initial Velocities
3.2.3. Constraints
3.2.4. DOF Coupling
3.2.5. Data Smoothing
3.2.6. Specify Explicit Dynamics Controls
3.2.7. Save Database and Solve
3.3. Review the Results
3.4. The Definition of Part
3.4.1. Part Assemblies
3.5. Adaptive Meshing
4. Loading
4.1. General Loading Options
4.1.1. Components
4.1.2. Array Parameters
4.1.3. Applying Loads
4.1.4. Data Curves
4.1.5. Defining Loads in a Local Coordinate System
4.1.6. Specifying Birth and Death Times
4.2. Constraints and Initial Conditions
4.2.1. Constraints
4.2.2. Welds
4.2.3. Initial Velocity
4.3. Coupling and Constraint Equations
4.4. Nonreflecting Boundaries
4.5. Temperature Loading
4.6. Dynamic Relaxation
5. Solution Features
5.1. Solution Process
5.2. LS-DYNA Termination Controls
5.3. LS-DYNA Parallel Processing Capabilities
5.3.1. Shared Memory Parallel Processing
5.3.2. Massively Parallel Processing
5.4. Double Precision LS-DYNA
5.5. Solution Control and Monitoring
5.6. Plotting Small Elements
5.7. Editing the LS-DYNA Input File
5.7.1. Using a Preexisting File.K
6. Contact Surfaces
6.1. Contact Definitions
6.1.1. Listing, Plotting and Deleting Contact Entities
6.2. Contact Options
6.2.1. Definition of Contact Types
6.2.2. Definition of Contact Options
6.3. Contact Search Methods
6.3.1. Mesh Connectivity Tracking
6.3.2. Bucket Sort Method
6.3.3. Limiting the Contact Search Domain
6.4. Special Considerations for Shells
6.5. Controlling Contact Depth
6.6. Contact Stiffness
6.6.1. Choice of Penalty Factor
6.6.2. Symmetry Stiffness
6.7. 2-D Contact Option
7. Material Models
7.1. Defining Explicit Dynamics Material Models
7.2. Explicit Dynamics Material Model Descriptions
7.2.1. Linear Elastic Models
7.2.2. Nonlinear Elastic Models
7.2.3. Nonlinear Inelastic Models
7.2.4. Pressure Dependent Plasticity Models
7.2.5. Foam Models
7.2.6. Equation of State Models
7.2.7. Discrete Element Models
7.2.8. Other Models
8. Rigid Bodies
8.1. Defining Rigid Bodies
8.2. Specifying Inertia Properties
8.3. Loading
8.4. Switching Parts from Deformable to Rigid
8.5. Nodal Rigid Bodies
9. Hourglassing
10. Mass Scaling
11. Subcycling
12. Postprocessing
12.1. Output Controls
12.1.1. Results (Jobname.RST) vs. History (Jobname.HIS) Files
12.1.2. Creating Components for POST26
12.1.3. Writing the Output Files for POST26
12.2. Using POST1 with ANSYS LS-DYNA
12.2.1. Animating Results
12.2.2. Element Output Data
12.2.3. Postprocessing after Adaptive Meshing
12.3. Using POST26 with ANSYS LS-DYNA
12.3.1. Nodal and Element Solutions
12.3.2. Reading ASCII Files for Miscellaneous Output Data
12.3.3. Data Smoothing
12.4. Finding Additional Information
13. Restarting
13.1. The Restart Dump File
13.2. The EDSTART Command
13.2.1. A New Analysis
13.2.2. A Simple Restart
13.2.3. A Small Restart
13.2.4. A Full Restart
13.3. Effect on Output Files
14. Explicit-to-Implicit Sequential Solution
14.1. Performing an Explicit-to-Implicit Sequential Solution
14.2. Troubleshooting a Springback Analysis
14.2.1. Springback Stabilization
15. Implicit-to-Explicit Sequential Solution
15.1. Structural Implicit-to-Explicit Solution for Preload
15.1.1. Special Considerations for Thermal Loading
15.2. Thermal Implicit-to-Explicit Solution
16. Arbitrary Lagrangian-Eulerian Formulation
16.1. Performing an ALE Analysis
17. Drop Test Module
17.1. Starting ANSYS With the Drop Test Module
17.2. Typical Drop Test Procedure
17.2.1. Basic Drop Test Analysis Procedure
17.2.2. Screen Coordinates Definition
17.2.3. Additional Notes on the Use of the DTM
17.3. Advanced DTM Features
17.3.1. Object Initial Velocity
17.3.2. Modifying the Target
17.4. Drop Test Set-up Dialog Box
17.4.1. Using the Drop Test Set-up Dialog Box
17.4.2. Basic Tab of the Drop Test Set-up Dialog Box
17.4.3. Velocity Tab of the Drop Test Set-up Dialog Box
17.4.4. Target Tab of the Drop Test Set-up Dialog Box
17.4.5. Status Tab of the Drop Test Set-up Dialog Box
17.5. Picking Nodes
17.6. Postprocessing - Animation
17.7. Postprocessing - Graph and List Time-History Variables
A. Comparison of Implicit and Explicit Methods
A.1. Time Integration
A.1.1. Implicit Time Integration
A.1.2. Explicit Time Integration
A.2. Stability Limit
A.2.1. Implicit Method
A.2.2. Explicit Method
A.3. Critical Time Step Size of a Rod
A.4. ANSYS LS-DYNA Time Step Size
B. Material Model Examples
B.1. ANSYS LS-DYNA Material Models
B.2. Material Model Examples
B.2.1. Isotropic Elastic Example: High Carbon Steel
B.2.2. Orthotropic Elastic Example: Aluminum Oxide
B.2.3. Anisotropic Elastic Example: Cadmium
B.2.4. Blatz-Ko Example: Rubber
B.2.5. Mooney-Rivlin Example: Rubber
B.2.6. Viscoelastic Example: Glass
B.2.7. Bilinear Isotropic Plasticity Example: Nickel Alloy
B.2.8. Transversely Anisotropic Elastic Plastic Example: 1010 Steel
B.2.9. Transversely Anisotropic FLD Example: Stainless Steel
B.2.10. Bilinear Kinematic Plasticity Example: Titanium Alloy
B.2.11. Plastic Kinematic Example: 1018 Steel
B.2.12. 3 Parameter Barlat Example: Aluminum 5182
B.2.13. Barlat Anisotropic Plasticity Example: 2008-T4 Aluminum
B.2.14. Rate Sensitive Powerlaw Plasticity Example: A356 Aluminum
B.2.15. Strain Rate Dependent Plasticity Example: 4140 Steel
B.2.16. Piecewise Linear Plasticity Example: High Carbon Steel
B.2.17. Modified Piecewise Linear Plasticity Example: PVC
B.2.18. Powerlaw Plasticity Example: Aluminum 1100
B.2.19. Elastic Viscoplastic Thermal Example
B.2.20. Geological Cap Example: SRI Dynamic Concrete
B.2.21. Johnson-Cook Linear Polynomial EOS Example: 1006 Steel
B.2.22. Johnson-Cook Gruneisen EOS Example: OFHC Copper
B.2.23. Null Material Linear Polynomial EOS Example: Brass
B.2.24. Null Material Gruneisen EOS Example: Aluminum
B.2.25. Steinberg Gruneisen EOS Example: Stainless Steel
B.2.26. Cable Material Example: Steel
B.2.27. Rigid Material Example: Steel
C. ANSYS LS-DYNA to LS-DYNA Command Mapping
D. Thermal/Structural Preload Example
Bibliography

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