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1. Introduction to Nonlinear Adaptivity
2. Nonlinear Mesh Adaptivity
2.1. Nonlinear Mesh Adaptivity Benefits
2.1.1. Example: Rubber Seal Simulation
2.1.2. Example: Crack Simulation
2.1.3. Example: 3D Metal Forging Simulation
2.1.4. Example: 2D Metal Extrusion Simulation
2.1.5. Compression of 2D Thermo-Hyperelastic U-Shape Simulation
2.1.6. Example: Extrusion Simulation with Coarsening
2.2. Nonlinear Mesh Adaptivity Usage Considerations
2.3. Nonlinear Mesh Adaptivity Requirements and Limitations
2.3.1. Other Requirements and Limitations
2.4. Understanding the Nonlinear Mesh Adaptivity Process
2.4.1. Checking Nonlinear Adaptivity Criteria
2.5. Nonlinear Mesh Adaptivity Criteria
2.5.1. Energy-Based Criterion
2.5.2. Position-Based Criterion
2.5.3. Contact-Based Criterion
2.5.4. Mesh-Quality-Based Criterion
2.5.5. Element-Removal-Based Criterion
2.6. Specifying Criteria-Checking Frequency
2.7. Generating the New Mesh
2.7.1. Generating a New Mesh via Splitting and Morphing
2.7.2. Generating a New Mesh via General Remeshing
2.8. Convergence at Substeps with the New Mesh
2.9. Controlling Nonlinear Mesh Adaptivity
2.10. Multiple Remeshings with Nonlinear Mesh Adaptivity
2.11. Restarting from a Nonlinear Mesh Adaptivity Analysis
2.12. Stabilization in a Nonlinear Mesh Adaptivity Analysis
2.13. Nonlinear Mesh Adaptivity Hints and Recommendations
2.14. Postprocessing Nonlinear Mesh Adaptivity Results
2.14.1. Using the Database Postprocessor (POST1)
2.14.2. Using the Time-History Postprocessor (POST26)
3. Nonlinear Mesh Adaptivity for Linear Analysis
3.1. Benefits of Using Nonlinear Mesh Adaptivity for Linear Analysis
3.2. Usage Information
4. Nonlinear Mesh Adaptivity for Element-Type Change (NLAD-ETCHG)
4.1. Introduction to NLAD-ETCHG
4.2. NLAD-ETCHG Usage Considerations
4.2.1. NLAD-ETCHG Requirements and Limitations
4.2.2. Understanding the NLAD-ETCHG Process
4.3. NLAD-ETCHG Criteria
4.3.1. Energy-Based Criterion in NLAD-ETCHG
4.3.2. Position-Based Criterion in NLAD-ETCHG
4.3.3. Mesh-Quality-Based Criterion in NLAD-ETCHG
4.4. Specifying Criteria-Checking Frequency
4.5. Generating the New Mesh
4.6. Controlling NLAD-ETCHG
4.7. Multiple Remeshings with NLAD-ETCHG
4.8. NLAD-ETCHG Hints and Recommendations
4.9. NLAD-ETCHG Examples
4.9.1. Plate with Notches Undergoing Small Deformation
4.9.2. Offset Punch of a Block Undergoing Large Deformation
5. Nonlinear Mesh Adaptivity for Geometry-Preserving Adaptive Analysis (NLAD-GPAD)
5.1. NLAD-GPAD Benefits
5.2. NLAD-GPAD Requirements and Limitations
5.3. NLAD-GPAD Usage
5.4. NLAD-GPAD Best Practices
6. Initial-Mesh Loading and Constraint
7. Rezoning
7.1. Benefits of Rezoning
7.1.1. Rezoning Usage Hints
7.2. Rezoning Requirements and Limitations
7.3. Understanding the Rezoning Process
7.3.1. Overview of the Rezoning Process Flow
7.3.2. Key Commands Used in Rezoning
7.4. Step 1: Determine the Substep to Initiate Rezoning
7.5. Step 2. Initiate Rezoning
7.6. Step 3: Select a Region to Remesh
7.7. Step 4: Perform the Remeshing Operation
7.7.1. Choosing a Remeshing Method
7.7.2. Mesh Control
7.7.3. Remeshing Multiple Regions at the Same Substep
7.8. Step 5: Verify Applied Contact Boundaries, Surface-Effect Elements, Loads, and Boundary Conditions
7.8.1. Contact Boundaries
7.8.2. Surface-Effect Elements
7.8.3. Pressure and Contiguous Displacements
7.8.4. Forces and Isolated Applied Displacements
7.8.5. Nodal Temperatures
7.8.6. Other Boundary Conditions and Loads
7.9. Step 6: Map Variables and Balance Residuals
7.9.1. Mapping Solution Variables
7.9.2. Balancing Residual Forces
7.9.3. Interpreting Mapped Results
7.9.4. Handling Convergence Difficulties
7.10. Step 7: Perform a Multiframe Restart
7.11. Repeating the Rezoning Process if Necessary
7.11.1. File Structures for Repeated Rezonings
7.12. Postprocessing Rezoning Results
7.12.1. Using the Database Postprocessor (POST1)
7.12.2. Using the Time-History Postprocessor (POST26)
7.13. Rezoning Restrictions
7.14. Stabilization in a Rezoning Analysis
7.15. Rezoning Examples
7.15.1. Example: Rezoning Using a Program-Generated New Mesh
7.15.2. Example: Rezoning Using a Generic New Mesh