Parameters
Material Preset
Creep Law
Temperature T
550 °C
Applied Stress σ₀
100 MPa
Time Scale (hours)
10000 h
Norton Coefficient A [1/h·MPa^n]
1.0e-15
Creep Exponent n
5.0
Activation Energy Q [kJ/mol]
280 kJ/mol
Relaxation Time Constant τ_r [h]
5000 h
—
Steady-State Creep Rate ε̇ [1/h]
—
Estimated Rupture Life t_r [h]
—
Relaxed Stress σ(t) [MPa]
—
Larson-Miller P_LM
Theory
Norton's Law (steady-state creep rate):
$$\dot\varepsilon = A\sigma^n e^{-Q/RT}$$Maxwell Model (stress relaxation):
$$\sigma(t) = \sigma_0\, e^{-t/\tau_r}$$Larson-Miller Parameter:
$$P_{LM} = T(\log t_r + C), \quad C \approx 20$$T [K], t_r [h], R = 8.314 J/(mol·K)
CAE Integration: ANSYS CREEP material model (Norton's law) / ABAQUS *CREEP / LS-DYNA MAT_181. Directly applicable to high-temperature design of boilers, turbines, and nuclear pressure vessels (ASME SEC III NH, EN 13445).