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ICME for Crashworthiness of TWIP Steels: From Ab Initio to the Crash Performance

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Abstract

During the last decade, integrated computational materials engineering (ICME) emerged as a field which aims to promote synergetic usage of formerly isolated simulation models, data and knowledge in materials science and engineering, in order to solve complex engineering problems. In our work, we applied the ICME approach to a crash box, a common automobile component crucial to passenger safety. A newly developed high manganese steel was selected as the material of the component and its crashworthiness was assessed by simulated and real drop tower tests. The crashworthiness of twinning-induced plasticity (TWIP) steel is intrinsically related to the strain hardening behavior caused by the combination of dislocation glide and deformation twinning. The relative contributions of those to the overall hardening behavior depend on the stacking fault energy (SFE) of the selected material. Both the deformation twinning mechanism and the stacking fault energy are individually well-researched topics, but especially for high-manganese steels, the determination of the stacking-fault energy and the occurrence of deformation twinning as a function of the SFE are crucial to understand the strain hardening behavior. We applied ab initio methods to calculate the stacking fault energy of the selected steel composition as an input to a recently developed strain hardening model which models deformation twinning based on the SFE-dependent dislocation mechanisms. This physically based material model is then applied to simulate a drop tower test in order to calculate the energy absorption capacity of the designed component. The results are in good agreement with experiments. The model chain links the crash performance to the SFE and hence to the chemical composition, which paves the way for computational materials design for crashworthiness.

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Acknowledgements

The authors gratefully acknowledge funding received from the German Research Foundation (DFG) within the collaborative research center SFB761 “Steel – ab initio.”

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Authors and Affiliations

  1. Institute of Metal Forming, RWTH Aachen University, Aachen, Germany

    O. Güvenç & M. Bambach

  2. Max-Planck-Institute for Iron Research, Max-Planck-Str.1, 40237, Düsseldorf, Germany

    F. Roters & T. Hickel

Authors
  1. O. Güvenç
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  2. F. Roters
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  3. T. Hickel
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  4. M. Bambach
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Correspondence to O. Güvenç.

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Güvenç, O., Roters, F., Hickel, T. et al. ICME for Crashworthiness of TWIP Steels: From Ab Initio to the Crash Performance. JOM 67, 120–128 (2015). https://doi.org/10.1007/s11837-014-1192-8

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  • DOI: https://doi.org/10.1007/s11837-014-1192-8

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