abaqus-odb

# Abaqus ODB Skill This skill reads and extracts analysis results from Abaqus ODB files. ## When to Use This Skill **Route here when user mentions:** - "What is the maximum stress?", "extract displacement" - "Get reaction forces", "post-process the ODB" - "Export results to CSV", "what are the eigenfrequencies?" **Route elsewhere:** - Running the analysis → `/abaqus-job` - Configuring what output to save → `/abaqus-output` - Exporting geometry (STL, STEP) → `/abaqus-export` ## Key Decisions ### 1. What Result is Needed? | Need | Field | Notes | |------|-------|-------| | Displacement | `U` | Use `.magnitude` for total | | Stress | `S` | Use `.mises` for von Mises | | Reaction force | `RF` | Sum components for total | | Strain | `E` | Similar structure to stress | | Temperature | `NT` | Thermal analysis results | | Eigenfrequency | Frame description | Parse from frame metadata | ### 2. Which Step/Frame? | Scenario | Frame Selection | |----------|-----------------| | Final results | `step.frames[-1]` | | All time history | Loop all frames | | Specific time | Find by `frameValue` | | Modal analysis | Each frame = mode | ### 3. Location: Global Max or Specific? | Need | Approach | |------|----------| | Overall maximum | Loop all values, find max | | Specific node | Filter by `nodeLabel` | | Subset/region | Use `getSubset(region=...)` | ### 4. Export Format? | Format | Use Case | |--------|----------| | Print to console | Quick check | | CSV file | Spreadsheet analysis | | Text report | Documentation | ## What to Ask User If unclear, ask: 1. **What result?** Stress, displacement, reaction force, frequency? 2. **Which step/frame?** Final, specific time, or all? 3. **Location?** Maximum anywhere, or specific node/region? 4. **Output format?** Print, CSV, or report? ## Workflow 1. **Open ODB** - Use `readOnly=True` for extraction 2. **Navigate to step/frame** - List steps with `odb.steps.keys()` 3. **Get field output** - Access via `frame.fieldOutputs['U']` 4. **Extract values** - Loop `field.values`, use `.magnitude`, `.mises` 5. **Close ODB** - Always close when done ## Common Tasks | Task | Approach | |------|----------| | Max displacement | Loop U values, find max magnitude | | Max von Mises stress | Loop S values, find max mises | | Total reaction force | Sum RF components across all nodes | | Displacement at node | Filter by nodeLabel | | Results in region | Use getSubset with node/element set | | Eigenfrequencies | Parse frame.description in frequency step | | Time history | Use historyRegions and historyOutputs | | Export to CSV | Write values with csv module | ## Troubleshooting | Error | Cause | Solution | |-------|-------|----------| | "ODB locked" | Another process has it | Delete `.lck` file | | "Key not found" | Wrong variable name | List available keys first | | "No values" | Output not requested | Check FieldOutputRequest in model | | "AttributeError: mises" | Element has no mises | Check element formulation | ## Code Patterns For API syntax and code examples, see: - [ODB Extraction Patterns](references/extraction-patterns.md) - [Common Queries](references/common-queries.md) - [Export Templates](references/export-templates.md)