Antoine
b88657b00c
Sources: 3 KBS capture sessions (20260210-132817, 20260210-161401, 20260210-163801)
Key changes:
- Mass corrected: 974 kg (p173) → 11.33 kg (p1) — KBS ground truth
- Beam length confirmed: 5,000 mm cantilever
- BCs confirmed: left fixed, right 10,000 kgf downward
- Material confirmed: AISI Steel 1005, density 7.3 g/cm³
- Mesh confirmed: CQUAD4 thin shell, 33.7 mm elements
- Hole geometry: span 4,000 mm (p6), offsets 500 mm fixed
- 3 gaps closed (G1, G2, G8), 6 new gaps identified (G10-G15)
- New expressions: beam_half_height, beam_half_width, beam_length, p6
Files: CONTEXT.md, kb/_index.md, kb/_history.md, kb/components/sandwich-beam.md,
kb/materials/steel-aisi.md, kb/fea/models/sol101-static.md, kb/dev/gen-002.md
4.2 KiB
4.2 KiB
SOL 101 — Static Analysis
Simulation: Beam_sim1.sim Solver: NX Nastran SOL 101 (Linear Static) Status: Setup confirmed from KBS session (Gen 002). Baseline run needed.
Setup — Confirmed
| Item | Value | Source | Notes |
|---|---|---|---|
| Solution type | SOL 101 (Linear Static) | KBS session | "Solution 1 — static subcase" |
| Element type | CQUAD4 (4-node quad shell) | KBS session | ✅ Confirmed — thin shell collectors |
| Property type | Thin shell | KBS session | Material inherited from "beam material" |
| Mesh density | Element size = 33.7 mm (67.4 / 2) | KBS session | Subdivision-based. Future refinement planned. |
| Idealization | Promote body → mid-surface extraction | KBS session | Pair mid-surface function |
Boundary Conditions — Confirmed
| BC | Location | Type | Value | Source |
|---|---|---|---|---|
| Fixed constraint | Left side of beam (full edge) | SPC (all 6 DOF) | Fixed | ✅ KBS session — "left side fixed" |
| Applied force | Right side of beam (free end) | Point/edge force | 10,000 kgf downward (−Y) | ✅ KBS session — "project requirement" |
Loading Details
- Force magnitude: 10,000 kgf = 98,066.5 N (≈ 98.1 kN)
- Direction: Downward (−Y in model coordinates)
- Application: Right side (free end) of beam
- Type: This is a cantilever beam with end loading — classic bending problem
Result Extraction
| Output | Method | Expression/Sensor | Status |
|---|---|---|---|
| Mass | NX expression | p1 (NOT p173) |
✅ Confirmed — 11.33 kg baseline |
| Tip displacement | ❓ Sensor or .f06 parse | TBD | Gap G3, G6 — need baseline run |
| Von Mises stress | ❓ Sensor or .f06 parse | TBD | Gap G4, G6 — need baseline run |
⚠️ Mass expression changed:
p1confirmed in KBS session, replacing previous assumption ofp173. Extractor config must be updated.
Mesh Details
| Property | Value | Notes |
|---|---|---|
| Element type | CQUAD4 | 4-node quadrilateral, first-order |
| Element size | 33.7 mm | 67.4 / 2 — Antoine says refinement is "not for now" |
| Mesh method | Subdivision-based | Auto-mesh with size control |
| Shell formulation | Thin shell | Mid-surface extracted from solid |
| Convergence | ❓ NOT VERIFIED | Gap G8 partially closed (type known), but convergence check still needed |
Mesh Estimate
- Beam length 5,000 mm / 33.7 mm ≈ 148 elements along length
- Perimeter of I-beam cross-section ≈ varies — but total mesh likely 10K–50K elements
- Expected DOF: 60K–300K → SOL 101 solve time: seconds to low minutes
Solver Considerations
From Technical Breakdown (Gen 001), updated with KBS data:
- Linear assumption: With 11.33 kg beam under 98 kN load, deflections may be significant relative to beam dimensions. L/δ ratio needs verification from baseline run.
- Mesh sensitivity: Stress at hole edges is mesh-dependent. CQUAD4 at 33.7 mm may not fully resolve SCF at 300 mm diameter holes (~28 elements around circumference — probably adequate but needs verification).
- Mesh morphing vs remesh: Parametric NX models typically remesh on update. Need to confirm behavior across DV range (Gap G7).
- Runtime estimate: Single beam, CQUAD4 thin shell → likely seconds per evaluation. Very fast.
- Unit system: NX model uses kg-mm-s (kgf for force). Nastran output stress in kPa → divide by 1000 for MPa.
Validation Checklist
- Baseline mass matches NX expression
p1(11.33 kg) - Baseline displacement measured (was 22 mm at old model state — needs re-verification G10)
- Baseline stress measured (never had a value — G11)
- Mesh convergence verified at baseline
- Mesh quality acceptable at DV range extremes
- Model rebuilds cleanly at all 4 corners of design space (Gap G7)
- Stress at hole edges resolved with current mesh density
History
- Gen 001 (2026-02-09): Initial documentation from technical breakdown. All solver details pending gap resolution.
- Gen 002 (2026-02-10): Confirmed from KBS session — CQUAD4 thin shell, 33.7 mm element size, cantilever BCs (left fixed, right 10,000 kgf down), mass via
p1. Material: AISI 1005.