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A comparative study on Damage evolution of two different DP1000 steel sheets

Thursday (27.09.2018)
12:15 - 12:30 S1/03 - 283
Part of:

The mechanical and failure behavior of two different dual phase steel sheets are compared. Based on the ultimate tensile strength, the investigated high strength steels, in the following termed as CR590Y980T-DP and CR700Y980T-DP, are both categorized as DP1000 but they are slightly different from chemical composition and microstructural characteristics. The high yield variant contains 10% more martensite grains and finer ferrite grains in comparison to CR590Y980T-DP. These differences result in considerable deviation in their damage behaviors. In this respect, various testing methods along with digital image correlation (DIC) technique are employed. Therefore, the local strain changes can be detected for a wide range of stress-state. The results show that CR590Y980T-DP with its comparatively lower yield stress but higher hardening fails without any significant localization. In the other hand, CR700Y980T-DP experiences considerable deformation after the damage initiates. Moreover, the damage behavior of the materials are modeled using the Modified-Bai-Wierzbicki damage criterion. This uncoupled phenomenological damage model is able to predict damage initiation, damage propagation, and fracture. The calibrated damage models are employed to study materials’ response through cutting processes.

Niloufar Habibi
RWTH Aachen University
Additional Authors:
  • Dr. Victoria Brinnel
    RWTH Aachen University
  • Prof. Dr. Sebastian Münstermann
    RWTH Aachen University