PSI - Issue 23

Petr Opěla et al. / Procedia Structural Integrity 23 (2019) 221 – 226 Petr Opěla et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 4. Flow curve comparison: experiment (boxes), Cingara & McQueen/ANN (full lines), Cingara & McQueen/GA (dashed lines). Colour curves – approximation, grey curves – prediction.

Fig. 5. Distribution of the relative percentage error: μ – mean value; σ – standard deviation.

4. Conclusions

By use of the Gleeble 3800, the experimental hot-flow-curve dataset of the AlSi1MgMn aluminium alloy has been acquired in the temperature range of 723 K – 823 K and the strain rate range of 0.5 s − 1 – 10 s − 1 , with the true strain up to 0.6. The Cingara & McQueen's model and its modification were chosen to approximate this dataset and allow a future prediction. Auxiliary variables (peak strain, peak and steady-state stress, hardening and softening