Machine learning for material-based optimization of forming processes and process simulations

Machine learning is significantly changing the view on existing problems in many application areas, including forming technology. As experts in the field of material characterization, modeling and simulation of forming processes, we investigate the use of machine learning in solving common and future problems in industry. The main advantage of machine learning over numerical simulations is its ability to provide real-time predictions. We use this to solve typical optimization problems in a time-efficient manner, such as the calibration of material models. We also use machine learning to solve more complex problems, such as the design of materials and processes. Moreover, machine learning enables us to digitally represent processes and components based on numerical simulations in real-time including their complex material behavior. For the development of machine learning models we use experimental data as well as simulation data and rely on the integration of expert knowledge.

Our services

Fig. 1.1: Procedure to create a machine learning-based transfer function for material model parameter identification
© Fraunhofer IWM
Time-efficient identification of material model parameters using machine learning.
  • Development of machine learning models for time-efficient calibration of material models. The identification of parameters of complex material models is very time-consuming and can take from a few hours to several days. A trained machine learning model can greatly accelerate this process. This works either by learning the behavior of the material model and identifying the material model parameters within an optimization or by directly learning the inverse relationship between material model response and material model parameters.
  • Development of machine learning-based process models, so-called surrogate models, taking into account the typically complex material behavior. Machine learning models are used to learn the behavior of a component or process simulation, providing a real-time capable digital twin of the process or component. Based on these models, variations of process and material parameters can be efficiently analyzed and their effect on the process result can be optimized.
  • Proof-of-concepts to evaluate the applicability and benefit of machine learning in the respective context.

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Fig. 1.2: Experimentally measured stress-strain curves of three metallic materials and the reproduced curves using an elasto-plastic material model and the identified model parameters via only one neural network model
© Fraunhofer IWM
Analysis of a cup drawing process on the bases of a surrogate process model.

Main research topics

Our research in the field of machine learning concentrates on

  • Time efficient parameter identification of material models
  • Solving material design problems, including microstructure optimization
  • Surrogate modeling of process and component simulations as well as solving process optimization problems
  • Development of soft sensors for the online availability of information on the state of a material within a process

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Publications

 

  • Wessel, A.; Morand, L.; Butz, A.; Helm, D.; Volk, W., A new machine learning based method for sampling virtual experiments and its effect on the parameter identification for anisotropic yield models, IOP Conference Series: Materials Science and Engineering Vol. 1157, 40th International Deep-Drawing Research Group Conference IDDRG 2021; Liewald, M.; Karadogan, C. (Eds.); IOP Publishing Ltd, Bristol, UK (2021) Art. 012026, 10 Seiten Link
  • Morand, L.; Helm, D., A mixture of experts approach to handle ambiguities in parameter identification problems in material modeling, Computational Materials Science 167 (2019) 85-91 Link
  • Morand, L.; Helm, D.; Iza-Teran, R.; Garcke, J., A knowledge-based surrogate modeling approach for cup drawing with limited data, IOP Conference Series: Materials Science and Engineering Vol. 651/1; 38th International Deep Drawing Research Group Annual Conference IDDRG 2019; van den Boogaard, T.; Langerak, N. (Eds.); IOP Publishing Ltd., Bristol, UK (2019) 012047 1-8 Link

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