TY - GEN A1 - Bähr, Martin A1 - Buhl, Johannes A1 - Radow, Georg A1 - Schmidt, Johannes A1 - Bambach, Markus A1 - Breuß, Michael A1 - Fügenschuh, Armin T1 - Stable honeycomb structures and temperature based trajectory optimization for wire-arc additive manufacturing T2 - Optimization and Engineering N2 - We consider two mathematical problems that are connected and occur in the layer-wise production process of a workpiece using wire-arc additive manufacturing. As the first task, we consider the automatic construction of a honeycomb structure, given the boundary of a shape of interest. In doing this, we employ Lloyd’s algorithm in two different realizations. For computing the incorporated Voronoi tesselation we consider the use of a Delaunay triangulation or alternatively, the eikonal equation. We compare and modify these approaches with the aim of combining their respective advantages. Then in the second task, to find an optimal tool path guaranteeing minimal production time and high quality of the workpiece, a mixed-integer linear programming problem is derived. The model takes thermal conduction and radiation during the process into account and aims to minimize temperature gradients inside the material. Its solvability for standard mixed-integer solvers is demonstrated on several test-instances. The results are compared with manufactured workpieces. KW - Mixed-integer linear programming KW - Geometric optimization KW - Eikonal equation KW - Heat transmission KW - Additive manufacturing KW - Centroidal Voronoi tesselation Y1 - 2021 U6 - https://doi.org/10.1007/s11081-020-09552-5 SN - 1573-2924 VL - 22 IS - 2 SP - 913 EP - 974 ER - TY - GEN A1 - Brykarczyk, Daniel A1 - Lenz, Wolfgang A1 - Neumann, Andreas A1 - Bambach, Markus T1 - Erhöhung der Lebensdauer metallischer Strahlheizrohre durch den Einsatz strukturierter Bleche T2 - Prozesswärme Y1 - 2020 SN - 2567-3742 VL - 4 ER - TY - GEN A1 - Lenz, Wolfgang A1 - Brykarczyk, Daniel A1 - Pfeifer, Herbert A1 - Neumann, Andreas A1 - Bambach, Markus T1 - Theoretical limits of the increase of radiative heat transfer by increased surface areas of radiant tubes T2 - Applied Thermal Engineering Y1 - 2021 U6 - https://doi.org/10.1016/j.applthermaleng.2020.116246 SN - 1359-4311 VL - Vol. 184 ER - TY - GEN A1 - Stendal, Johan Andreas A1 - Eisentraut, Mark A1 - Sizova, Irina A1 - Bolz, Sebastian A1 - Weiß, Sabine A1 - Bambach, Markus T1 - Accelerated hot deformation and heat treatment of the TiAl alloy TNM-B1 for enhanced hot workability and controlled damage T2 - Journal of Materials Processing Technology Y1 - 2021 U6 - https://doi.org/10.1016/j.jmatprotec.2020.116999 SN - 0924-0136 VL - Vol. 291 ER - TY - GEN A1 - Hemes, Susanne A1 - Meiners, Frank A1 - Sizova, Irina A1 - Hama-Saleh, Rebar A1 - Röhrens, Daniel A1 - Weisheit, Andreas A1 - Häfner, Constantin Leon A1 - Bambach, Markus T1 - Microstructures and Mechanical Properties of Hybrid, Additively Manufactured Ti6Al4V after Thermomechanical Processing T2 - Materials Y1 - 2021 U6 - https://doi.org/10.3390/ma14041039 SN - 1996-1944 VL - 14 IS - 4 ER - TY - THES A1 - Emdadi, Aliakbar T1 - High-Temperature Deformation Behavior of Intermetallic Titanium and Iron Aluminides Produced by Spark Plasma Sintering Y1 - 2021 SN - 978-3-8440-7933-3 PB - Shaker Verlag CY - Düren ER - TY - GEN A1 - Blumberg, Julian A1 - Li, Zhoulong A1 - Besong, Lemopi Isidore A1 - Polte, Mitchel A1 - Buhl, Johannes A1 - Uhlmann, Eckart A1 - Bambach, Markus T1 - Deformation error compensation of industrial robots in single point incremental forming by means of data-driven stiffness model T2 - 26th International Conference on Automation and Computing (ICAC), 2-4 Sept. 2021, Portsmouth, United Kingdom Y1 - 2021 SN - 978-1-86043-557-7 SN - 978-1-6654-4352-4 U6 - https://doi.org/10.23919/ICAC50006.2021.9594138 ER - TY - GEN A1 - Bambach, Markus A1 - Sizova, Irina A1 - Szyndler, Joanna A1 - Bennett, Jennifer A1 - Hyatt, Greg A1 - Cao, Jian A1 - Papke, Thomas A1 - Merklein, Marion T1 - On the hot deformation behavior of Ti-6Al-4V made by additive manufacturing T2 - Journal of Materials Processing Technology KW - Titanium KW - Additive manufacturing KW - Hot deformation Y1 - 2021 U6 - https://doi.org/10.1016/j.jmatprotec.2020.116840 SN - 0924-0136 SN - 1873-4774 VL - 288 ER - TY - GEN A1 - Sizova, Irina A1 - Sviridov, Alexander A1 - Bambach, Markus A1 - Eisentraut, Mark A1 - Hemes, Susanne A1 - Hecht, Ulrike A1 - Marquardt, Axel A1 - Leyens, Christoph T1 - A study on hot-working as alternative post-processing method for titanium aluminides built by laser powder bed fusion and electron beam melting T2 - Journal of Materials Processing Technology Y1 - 2021 U6 - https://doi.org/10.1016/j.jmatprotec.2020.117024 SN - 0924-0136 SN - 1873-4774 VL - 291 ER - TY - GEN A1 - Bambach, Markus A1 - Imran, Muhammad A1 - Sizova, Irina A1 - Buhl, Johannes A1 - Gerster, Stephan A1 - Herty, Michael T1 - A soft sensor for property control in multi-stage hot forming based on a level set formulation of grain size evolution and machine learning T2 - Advances in Industrial and Manufacturing Engineering Y1 - 2021 U6 - https://doi.org/10.1016/j.aime.2021.100041 SN - 2666-9129 IS - 2 ER -