Compute stress intensity factor K_IC = Y·σ·√(πa) from geometry factor, applied stress and crack half-length to assess fracture safety.
输入几何因子 Y、应力 σ、裂纹半长 a,求应力强度因子。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Stress intensity factor | K = σ·√(πa)·Y | George Irwin, 1957 |
| Energy criterion | Crack grows when G ≥ G_c | Griffith energy criterion, 1921 |
| Design criterion | K < K_IC prevents unstable fracture | GB/T 4161 / ASTM E399 |