Table 1: Parameters of the viscoelastic-plastic creep model.

Stress level (MPa)E1 (MPa)E2 (MPa)η2 (MPa·min)η0 (MPa·min)αβR2

27.1613667.22120846.501123865.913356791.520.022.580.988
35.1612528.82457903.912265214.34219.08−7.650.080.997
43.1611899.1863875.701.45E + 1651177.93−2.650.190.959
51.1611520.01432090.97110414.84999684.64−8.34E − 067.800.990