LightMAT 2023
Lecture
22.06.2023 (CEST)
A unified damage formulation capturing the brittle-to-ductile transition with physical interpretation
YH

Dr. Yi Hu

Max-Planck-Institut für Nachhaltige Materialien GmbH

Hu, Y. (Speaker)¹; Falkinger, G.²; Roters, F.¹
¹Max-Planck-Institut für Eisenforschung GmbH, Duesseldorf (Germany); ²AMAG rolling GmbH, Ranshofen (Austria)
Vorschau
20 Min. Untertitel (CC)

In the past metal damage researches generally followed two paths: one is the careful study of void nucleation-growth and coalescence behavior and its significance on the mechanical yielding response, which can be summarized in a Gurson-Tvergaard-Needleman model or its variants; the other path is to apply advanced Phase-Field-Model techniques to have a detailed investigation of crack initiation and growth. Here we attempt to build the connection between two paths. A consistent damage Phase-Field approach is proposed and we analyze the effects of different coupling strategies. We show that using the consistent approach both brittle and ductile damage behaviors can be captured. Furthermore, the post-damage behavior for the ductile damage is shown to be driven by plasticity, which is expected in ductile damage. Extensive tests are performed to demonstrate that our consistent model can be used in different loading scenarios. In addition, we create realistic microstructures for aluminium alloys, and simulate their damage behaviors for future damage tolerant product development.

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