Advances in Materials Science and Engineering / 2016 / Article / Tab 2

Research Article

A Numerical Modelling Approach for Time-Dependent Deformation of Hot Forming Tools under the Creep-Fatigue Regime

Table 2

Optimized values of the coefficients in (1) on the basis of experimental data for creep, fatigue, and creep-fatigue conditions.
(a)

Creep
380 [°C]490 [°C]540 [°C]580 [°C]

 400 [MPa]7.00E − 141.44E − 084.46E − 074.00E − 06
 600 [MPa]7.33E − 141.44E − 084.46E − 07
 800 [MPa]7.33E − 141.44E − 08

 400 [MPa]3.971.921.351.06
 600 [MPa]3.701.821.40
 800 [MPa]3.571.82

 400 [MPa]−0.9325−0.9150−0.8700−0.8700
 600 [MPa]−0.9325−0.9150−0.8700
 800 [MPa]−0.9325−0.9150

(b)

Fatigue
380 [°C]490 [°C]540 [°C]580 [°C]

 400 [MPa]6.00E − 141.33E − 84.00E − 73.00E − 06
 600 [MPa]6.00E − 141.33E − 84.00E − 7
 800 [MPa]6.00E − 141.33E − 8

 400 [MPa]3.961.901.340.99
 600 [MPa]3.741.771.27
 800 [MPa]3.601.74

 400 [MPa]−0.9325−0.9150−0.8700−0.8700
 600 [MPa]−0.9325−0.9150−0.8700
 800 [MPa]−0.9325−0.9150

(c)

Creep-fatigue
380 [°C]490 [°C]540 [°C]580 [°C]

 400 [MPa]6.40E − 141.42E − 84.20E − 73.80E − 06
 600 [MPa]6.40E − 141.42E − 84.20E − 7
 800 [MPa]6.40E − 141.42E − 8

 400 [MPa]3.971.921.351.05
 600 [MPa]3.721.841.30
 800 [MPa]3.621.83

 400 [MPa]−0.9325−0.9150−0.8700−0.8700
 600 [MPa]−0.9325−0.9150−0.8700
 800 [MPa]−0.9325−0.9150

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