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abaqus-odb

Read analysis results. Use when user asks about maximum stress, extracting displacements, reaction forces, or exporting results. Post-processes ODB files.

personAuthor: jakexiaohubgithub
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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: