Larson-Miller parameter

Larson-Miller parameter

[′lärs·ən ′mil·ər pə′ram·əd·ər]
(mechanics)
The effects of time and temperature on creep, being defined empirically as P = T (C + log t) × 10-3, where T = test temperature in degrees Rankine (degrees Fahrenheit + 460) and t = test time in hours; the constant C depends upon the material but is frequently taken to be 20.