C 01

Bridging Scales - From Geometric Part Details to Construction Elements

Prof. Dr. rer. nat. Ernst Rank, Project Leader
PD Dr.-Ing. habil. Stefan Kollmannsberger, Project Leader

M. Sc. Oguz Oztoprak

Summary of C 01

Digital models for AM involve many different geometric scales. These scales start from micrometres for metal- or concrete-based processes. AM product scales, which are in the centre of this project, characterise parts as well as entire const- ructions and range up to tens of metres. This project has closely connected central goals: The first one is to develop a consistent description for the relevant geometric models. The second focusses on efficient simulation methods for AM products in construction, based on the multi-scale geometric models. Finally, special emphasis is placed on validation of the developed techniques.

Prof. Dr. rer. nat. Ernst Rank

is head of the Chair for Computation in Engineering. As such, he guides researchers in the areas of geometric modelling and develops simulation methods of high accuracy. He has actively carried out research in this area himself for decades. In this research project, he is responsible for the bridging of scales as well as the development of simulations regarding mineral based artefacts. Professor Rank will retire on March 31, 2020. He intends to continue his research in TR277 at least for the whole first funding period. The university has guaranteed working facilities for Prof. Rank.

ernst.rank(at)tum.de

PD Dr.-Ing. habil. Stefan Kollmannsberger

is head of the work group ‘Simulation in Applied Mechanics’ at the Chair of Computational Modeling and Simulation and has a fifteen year-long scientific record in that field. In this project, he is responsible for the development of simulation methods for metal based artefacts. He shares responsibility in the quest for bridging scales with Prof. Ernst Rank. Both have been collaborating at the Chair for Computation in Engineering for many years and Dr.-Ing. Stefan Kollmannsberger will be associated to the Chair for Modelling and Simulation (Prof. Borrmann) and lead the research group for Simulation in Applied Mechanics. His new assignment will be active from 1.1.2020.

stefan.kollmannsberger(at)tum.de

M.Sc. Oguz Oztoprak

oguz.oztoprak(at)tum.de

2021 | Korshunova, N.; Papaioannou, I.; Kollmannsberger S.; Straub, D.; Rank, E.: Uncertainty quantification of microstructure variability and mechanical behavior of additively manufactured lattice structures. In: Computer Methods in Applied Mechanics and Engineering 385 (1), pp. 114049, 2021. https://doi.org/10.1016/j.cma.2021.114049.

2021 | Paolini, A.; Korshunova, N.; Kollmannsberger, S.; Rank, E.: Multiscale analysis of high damping composites using the finite cell and the mortar method. In: International Journal of Structural Stability and Dynamics, 2021. DOI: 10.1142/S0219455421501492.

2021 | Jomo, J.; Oztoprak, O.; de Prenter, F.; Zander, N.; Kollmannsberger, S.; Rank, E.: Hierarchical multigrid approaches for the finite cell method on uniform and multi-level hp-refined grids. In: Computer Methods in Applied Mechanics and Engineering 386, pp. 114075, 2021. DOI: 10.1016/j.cma.2021.114075.

2021 | Alaimo, G.; Carraturo, M.; Korshunova, N.; Kollmannsberger, S.: Numerical evaluation of high cycle fatigue life for additively manufactured stainless steel 316L lattice structures. In: Material Design and Processing Communication 3 (4), pp. e249, Wiley, 2021. DOI: 10.1002/mdp2.249.

2021 | Korshunova, N.; Alaimo, G.; Hosseini, S. B.; Carraturo, M.; Reali, A.; Niiranen, J.; Auricchio, F.; Rank, E.; Kollmannsberger, S.: Bending behavior of octet-truss lattice structures: modelling options, numerical characterization and experimental validation. In: Materials & Design, 2021

2021 | Korshunova, N.; Alaimo, G.; Hosseini, S.; Carraturo, M.; Reali, A.; Niiranen, J.; Auricchio, F.; Rank, E.; Kollmannsberger, S.: A CT-based numerical characterization of tensile behavior of additively manufactured octet-truss structures and its experimental validation. In: Additive Manufacturing, p. 101949, 2021. https://doi.org/10.1016/j.addma.2021.101949.

2020 | Wassermann, B.; Korshunova, N.; Kollmannsberger, S.; Rank, E.; Elber, G.:Finite Cell Method for functionally graded materials based on V-models and homogenized microstructures. In: Advanced Modeling and Simulation in Engineering Sciences - (7), pp. 49, 2020. DOI: 10.1186/s40323-020-00182-1.

2019 | Wassermann, B.; Kollmannsberger, S.; Yin, S.; Kudela, L.; Rank, E.: Integrating CAD and numerical Analysis: ‘Dirty Geometry’ handling using the Finite Cell Method. In: Computer Methods in Applied Mechanics and Engineering, vol. 351, pp.808-835.

2019 | Kollmannsberger, S.; Carraturo, M.; Reali, A.; Auricchio, F.: Accurate Prediction of Melt Pool Shapes in Laser Powder Bed Fusion by the Non- Linear Temperature Equation Including Phase Changes. In: Integrating Materials and Manufacturing Innovation, vol. 8(2), pp. 167-177.

2018 | Paolini, A.; Frischmann, F.; Kollmannsberger, S.; Rabold, A.; Horger, T.; Wohlmuth, B.; Rank, E.: BIM gestützte strukturdynamische Analyse mit Volumenelementen höherer Ordnung. In: Bauingenieur 93 (4), pp. 160-166.

2018 | Kollmannsberger, S.; Özcan, A.; Carraturo, M.; Zander, N.; Rank, E.: A hierarchical computational model for moving thermal loads and phase changes with applications to Selective Laser Melting. In: Computers & Mathematics with Applications, vol. 75(5), pp. 1483-1497.

2018 | Özcan, A.; Kollmannsberger, S.; Jomo, J.; Rank, E.: Residual stresses in metal deposition modelling: discretizations of high order. In: Computers & Mathematics with Applications, in press available online, doi:10.1016/j.camwa.2018.10.027.

2017 | Düster, A.; Rank, E.; Szabó, B.: The p-version of the Finite Element and Finite Cell Methods. In: Encyclopedia of Computational Mechanics, 2nd ed., Solids and Structures, E. Stein, R. de Borst and T.J.R. Hughes, John Wiley & Sons, Ltd.

2016 | Di Stolfo, P.; Schröder, A.; Zander, N.; Kollmannsberger, S.: An easy treatment of hanging nodes in hp-finite elements. In: Finite Elements in Analysis and Design, vol. 121, pp. 101-117.

2012 | Rank, E.; Ruess, M.; Kollmannsberger, S.; Schillinger, D.; Düster, A.: Geometric modelling, isogeometric analysis and the Finite Cell Method. In: Computer Methods in Applied Mechanics and Engineering, vol 249-252, pp.104-115.

2012 | Schillinger, D.; Dedè, L.; Scott, M. A.; Evans, J. A.; Borden, M. J.; Rank, E.; Hughes, T. J. R.: An Isogeometric Design-through-analysis Methodology based on Adaptive Hierarchical Refinement of NURBS, Immersed Boundary Methods, and T- spline CAD Surfaces. In: Computer Methods in Applied Mechanics and Engineering, vol. 249-250, pp. 116-150.

2008 | Düster, A.; Parvizian, J.; Yang, Z.; Rank, E.: The Finite Cell Method for three-dimensional problems of solid mechanics. In: Computer Methods in Applied Mechanics and Engineering, vol. 197(45–48), pp. 3768-3782.