[D07] Hashin: Fibre Failure Modes (FT + FC)

[Siddardth7]

Due: April 2 | Day 7 of 14

• Add hashin(stress_local, strengths) function to src/clt.py
• Implement Fibre Tension (FT): σ₁ > 0 → FI_FT = (σ₁/X_T)² + (τ₁₂/S₁₂)²
• Implement Fibre Compression (FC): σ₁ < 0 → FI_FC = (σ₁/X_C)²
• Return {"FI_FT": float, "FI_FC": float} dict
• Test: for σ₁ > X_T, confirm FI_FT > 1.0
• Test: for low stress, confirm both indices < 1.0

✅ Done when: hashin() runs, returns correct FI_FT + FI_FC. FI_FT > 1 when σ₁ > X_T.