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docs: Update protocol docs and method selector improvements

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- SYS_12: Add extractor library updates
- SYS_15: Add method selector documentation updates
- method_selector.py: Minor improvements to method selection logic

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Antoine
2025-12-07 19:10:45 -05:00
parent 0e04457539
commit c6f39bfd6c
3 changed files with 59 additions and 5 deletions
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docs/protocols/system/SYS_12_EXTRACTOR_LIBRARY.md
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@@ -371,9 +371,33 @@ If needed physics isn't in library:
|---------|-------|----------|
| "No displacement data found" | Wrong subcase number | Check subcase in OP2 |
| "OP2 file not found" | Solve failed | Check NX logs |
| "Element type not supported" | Using unsupported element | Check available types in function |
| "Unknown element type: auto" | Element type not specified | Specify `element_type='cquad4'` or `'ctetra'` |
| "No stress results in OP2" | Wrong element type specified | Use correct type for your mesh |
| Import error | Module not exported | Check `__init__.py` exports |
### Element Type Selection Guide
**Critical**: You must specify the correct element type for stress extraction based on your mesh:
| Mesh Type | Elements | `element_type=` |
|-----------|----------|-----------------|
| **Shell** (thin structures) | CQUAD4, CTRIA3 | `'cquad4'` or `'ctria3'` |
| **Solid** (3D volumes) | CTETRA, CHEXA | `'ctetra'` or `'chexa'` |
**How to check your mesh type:**
1. Open .dat/.bdf file
2. Search for element cards (CQUAD4, CTETRA, etc.)
3. Use the dominant element type
**Common models:**
- **Bracket (solid)**: Uses CTETRA → `element_type='ctetra'`
- **Beam (shell)**: Uses CQUAD4 → `element_type='cquad4'`
- **Mirror (shell)**: Uses CQUAD4 → `element_type='cquad4'`
**Von Mises column mapping** (handled automatically):
- Shell elements (8 columns): von Mises at column 7
- Solid elements (10 columns): von Mises at column 9
---
## Cross-References
@@ -583,3 +607,4 @@ nx_journals/
| 1.0 | 2025-12-05 | Initial consolidation from scattered docs |
| 1.1 | 2025-12-06 | Added Phase 2: E12 (principal stress), E13 (strain energy), E14 (SPC forces) |
| 1.2 | 2025-12-06 | Added Phase 3: E15-E17 (thermal), E18 (modal mass) |
| 1.3 | 2025-12-07 | Added Element Type Selection Guide; documented shell vs solid stress columns |