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
60 lines
3.2 KiB
Markdown
60 lines
3.2 KiB
Markdown
# Steel — AISI 1005
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**Status:** Baseline material confirmed (Gen 002)
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**NX Material Name:** "beam material" (inherited by thin shell property)
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---
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## Properties
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| Property | Value | Units | Source | Confidence |
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|----------|-------|-------|--------|------------|
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| Standard | AISI / SAE | — | KBS session | ✅ Confirmed |
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| Grade | **1005** | — | KBS session ("NSE steel 10 or 5" = ANSI Steel 1005) | ✅ Confirmed |
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| Density | **7.3** | g/cm³ (7,300 kg/m³) | KBS session — Antoine stated directly | ✅ Confirmed |
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| E (Young's modulus) | ~200 | GPa | Typical for AISI 1005 — **needs NX verification** | 🟡 Estimated |
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| Yield strength | ~285 | MPa | Typical for AISI 1005 (cold-drawn) — **needs NX verification** | 🟡 Estimated |
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| UTS | ~330 | MPa | Typical for AISI 1005 — **needs NX verification** | 🟡 Estimated |
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| Poisson's ratio | ~0.29 | — | Typical for carbon steel — **needs NX verification** | 🟡 Estimated |
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| Elongation | ~20 | % | Typical for AISI 1005 — **needs verification** | 🟡 Estimated |
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## Notes on AISI 1005
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- AISI 1005 is a **low-carbon plain steel** (0.06% max C) in the 10xx series
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- Commonly used for structural applications — good weldability, moderate strength
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- NX material library designation may vary (Antoine said "NSE steel 10 or 5" which maps to ANSI/AISI Steel 1005)
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- **Density note:** Antoine stated 7.3 g/cm³. Standard steel is 7.85 g/cm³. The 7.3 value may be the NX library default or a specific setting. This affects mass calculation directly.
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## Stress Allowable
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| Parameter | Value | Basis | Status |
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|-----------|-------|-------|--------|
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| Stress constraint | 130 MPa | From intake — Gap G9 | 🟡 Not yet confirmed for Gen 002 |
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| Implied safety factor | ~2.2 | vs. 285 MPa yield (estimated) | Conservative |
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> ⚠️ Need to confirm whether the 130 MPa stress limit from Gen 001 intake still applies given the mass discrepancy resolution. The 130 MPa may have been set for the ~974 kg model.
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## Future Material Expansion
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Antoine explicitly requested future material support (KBS session 20260210-163801):
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| Material | Standard | Priority | Notes |
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|----------|----------|----------|-------|
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| **Aluminum 6061** | — | Future | Antoine: "change this type of material for aluminum, 6061" |
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| **Stainless Steel ANSI 310** | ANSI 310 | Future | Antoine: "stainless steel. ANSI, let's say 310" |
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> Antoine's instruction: "Don't start with [these]. Just add this as a future expansion for the optimization process."
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### Material Expansion Implications
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- Multi-material optimization would change the problem fundamentally:
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- Different E, ρ, σ_y for each material → different optimal geometries
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- Could be handled as a categorical DV or separate optimization runs per material
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- Aluminum 6061: E ≈ 69 GPa, ρ ≈ 2.7 g/cm³, σ_y ≈ 276 MPa — lighter but much less stiff
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- SS 310: E ≈ 200 GPa, ρ ≈ 8.0 g/cm³, σ_y ≈ 205 MPa — heavier, similar stiffness, lower yield
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## History
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- **Gen 001** (2026-02-09): Placeholder — only knew "Steel (AISI)"
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- **Gen 002** (2026-02-10): Confirmed AISI 1005 from KBS session. Density confirmed 7.3 g/cm³. Future materials flagged (Al 6061, SS 310). Typical mechanical properties added (pending NX verification).
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