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NUMERICAL ANALYSIS OF DAMAGE DURING HOT FORMING

JOANNA SZYNDLER, MUHAMMAD IMRAN, MUHAMMAD JUNAID AFZAL, MARKUS BAMBACH

Abstract: The main aim of the presented research is the analysis of damage evolution in 16MnCrS5 steel during hot forming based on results obtained from finite element modelling. Particular attention is put on the interaction between dynamic recrystallization (DRX) and damage initiation at the matrix-inclusion interface. Moreover, a modified Gurson-TvergaardNeedleman (GTN) model is proposed with the nucleation criterion taken from an extended Horstemeyer model, which predicts damage nucleation based on material softening due to the DRX and stress state in the material.

Key words: Damage, Dynamic recrystallization, Void nucleation, Numerical modelling