| Larson-Miller parameter [`lärs·ǝn `mil·ǝr pǝ`ram·ǝd·ǝr] 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. |