Creep — Robinson life-fraction rule
Cumulative creep damage
Sum t/t_rupture across each operating period; D ≥ 1 means design creep life is consumed.
| T (°C) | σ (MPa) | Hours at condition | t_rupture (h) at (T,σ) | t/t_r | |
|---|---|---|---|---|---|
| 0.1000 | |||||
| 0.0625 | |||||
| 0.0333 |
Creep damage accumulation · Robinson Σ(t/tr)
Total Σ(t/t_r)0.1958
Remaining life-fraction0.8042
VerdictPASS
Robinson's rule (1952). t_rupture comes from a Larson-Miller parameter fit to material-specific stress-rupture data — see ASME II-D Section II Part D Tables U / Y.
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