@misc{AfzalMaqboolHajavifardetal., author = {Afzal, Muhammad Junaid and Maqbool, Fawad and Hajavifard, Ramin and Buhl, Johannes and Walther, Frank and Bambach, Markus}, title = {Modeling the Residual Stresses Induced in the Metastable Austenitic Stainless Steel Disc Springs manufactured by Incremental Sheet Forming by a Combined Hardening Model with Phase Transformation}, series = {Procedia Manufacturing : Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing : Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.300}, pages = {1410 -- 1415}, language = {en} } @misc{BesongBuhlUensaletal., author = {Besong, Lemopi Isidore and Buhl, Johannes and {\"U}nsal, Ismail and Bambach, Markus and Polte, Mitchel and Blumberg, Julian and Uhlmann, Eckart}, title = {Development of Tool Paths for Multi-axis Single Stage Incremental Hole-flanging}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.290}, pages = {1392 -- 1398}, language = {en} } @misc{NeumannBrykarczykLenzetal., author = {Neumann, Andreas and Brykarczyk, Daniel and Lenz, Wolfgang and Bambach, Markus and Pfeifer, Herbert}, title = {Using Vault Structure Steels to Improve the Lifetime of Radiant Tubes}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.240}, pages = {1288 -- 1292}, language = {en} } @misc{EmdadiSizovaStryzhyborodaetal., author = {Emdadi, Aliakbar and Sizova, Irina and Stryzhyboroda, Oleg and Hecht, Ulrike and Buhl, Johannes and Bambach, Markus}, title = {Hot Workability of a Spark Plasma Sintered Intermetallic Iron Aluminide Alloy Above and Below the Order-disorder Transition Temperature}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.238}, pages = {1281 -- 1287}, language = {en} } @misc{IsrarBuhlBambach, author = {Israr, Rameez and Buhl, Johannes and Bambach, Markus}, title = {Numerical Analysis of Different Fixation Strategies in Direct Energy Deposition Processes}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming; edited by Markus Bambach}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming; edited by Markus Bambach}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.145}, pages = {1184 -- 1189}, language = {en} } @misc{BambachFuegenschuhBuhletal., author = {Bambach, Markus and F{\"u}genschuh, Armin and Buhl, Johannes and Jensch, Felix and Schmidt, Johannes}, title = {Mathematical Modeling and Optimization for Powder-Based Additive Manufacturing}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.158}, pages = {1159 -- 1163}, language = {en} } @misc{JedynakSviridovBambachetal., author = {Jedynak, Angelika and Sviridov, Alexander and Bambach, Markus and Beckers, Daniel and Graf, Gregor}, title = {On the Potential of Using Selective Laser Melting for the Fast Development of Forging Alloys at the Example of Waspaloy}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.138}, pages = {1149 -- 1153}, language = {en} } @misc{SefidiIsrarBuhletal., author = {Sefidi, Moein Pakdel and Israr, Rameez and Buhl, Johannes and Bambach, Markus}, title = {Rule-Based Path Identification for Direct Energy Deposition}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/jpromfg.2020.04.133}, pages = {1134 -- 1140}, language = {en} } @misc{BreussBuhlMansouriYarahmadietal., author = {Breuß, Michael and Buhl, Johannes and Mansouri Yarahmadi, Ashkan and Bambach, Markus and Peter, Pascal}, title = {A Simple Approach to Stiffness Enhancement of a Printable Shape by Hamilton-Jacobi Skeletonization}, series = {Procedia Manufacturing}, volume = {Vol. 47}, journal = {Procedia Manufacturing}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.147}, pages = {1190 -- 1196}, abstract = {The 3D-Printing technology is ready to produce parts with specific properties like individual stiffness. Based on a predefined outer shape, the inner structure of a printed part defines mainly the mechanical features. By Hamilton-Jacobi skeletonization, a stiffness enhancement of a printable shape can be achieved in a way, that a novel AM-corner includes linear axis function. Originating in the field of shape analysis in computer vision and graphics, the so-called medial axis transform (MAT) is designed for the computation of a structure that resembles the bone structure of biological shapes. The input for MAT computation is typically a shape's boundary. The arising topological skeletons have proven to provide a useful concept for many applications; however, their computation is generally intricate and also known to rely on many parameters, diminishing the accessibility of skeletonization methods. In this work, the classical Hamilton-Jacobi skeletonization approach is adopted to compute a stability enhancing shape structure. As the basic method has not been designed for the context of additive manufacturing, a set of suitable modifications are introduced to design an algorithm that suits our intended purpose. Unlike the traditional skeletonization schemes, the resulting method appears to be robust and in practice almost completely automated as we can identify useful generic parameter settings. By a finite element method (FEM) study, the elastic stress properties of the AM-corner with linear axis function is validated and printed with in metal (1.4404) with the 3D Selected Laser Melting (SLM) system AconityMIDI. The AM-knot with skeletonization guides approximately 20 times better than a standard knot. While the first obtained results are shown as 2.5 dimensional shapes, it is emphasized that the proposed algorithm offers many possibilities for extensions to three dimensions and variations in context of additive manufacturing.}, language = {en} } @misc{BuhlHartRawungBambach, author = {Buhl, Johannes and Hart-Rawung, Thawin and Bambach, Markus}, title = {Nutzung von Neuralen Netzen zur effizienten Auslegung des Pressh{\"a}rtens von 22MnB5}, series = {Tagungsband zum 15. Erlanger Workshop Warmblechumformung, Erlangen, den 17. November 2020}, journal = {Tagungsband zum 15. Erlanger Workshop Warmblechumformung, Erlangen, den 17. November 2020}, publisher = {Lehrstuhl f{\"u}r Fertigungstechnologie, Friedrich-Alexander-Universit{\"a}t Erlangen-N{\"u}rnberg}, address = {Erlangen}, isbn = {978-3-00-066911-8}, pages = {99 -- 112}, language = {de} } @misc{BaehrBuhlRadowetal., author = {B{\"a}hr, Martin and Buhl, Johannes and Radow, Georg and Schmidt, Johannes and Bambach, Markus and Breuß, Michael and F{\"u}genschuh, Armin}, title = {Stable honeycomb structures and temperature based trajectory optimization for wire-arc additive manufacturing}, series = {Optimization and Engineering}, volume = {22}, journal = {Optimization and Engineering}, number = {2}, issn = {1573-2924}, doi = {10.1007/s11081-020-09552-5}, pages = {913 -- 974}, abstract = {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.}, language = {en} } @misc{EisentrautStendalBolzetal., author = {Eisentraut, Mark and Stendal, Johan Andreas and Bolz, Sebastian and Bambach, Markus and Weiß, Sabine}, title = {Applying a softening adapted acceleration to the hot deformation of TNM-B1}, series = {MRS Fall Meeting 2020}, journal = {MRS Fall Meeting 2020}, abstract = {Hot isostatically forged TiAl turbine blades made of TNM-B1 are commercially used in aircraft engines, as they offer significantly lower weight than the traditional nickel-based blades while exhibiting similar strength. Like other TiAl alloys, TNM-B1 displays high peak stress followed by a strong softening behavior (i.e. stress reduction) during hot deformation. This softening can be used to accelerate the deformation process by reducing the processing time and in turn the costs for TNM-B1 parts. In order to avoid increased damage during the accelerated process, a pre-heat treatment (HT) for the hot isostatically pressed material (HIP) is required. To simulate the accelerated forming process, hot compression tests were performed with a DIL805A/D/T dilatometer from TA Instruments (New Castle, Delaware, USA) with different strain rates (0.0013, 0.005, 0.01 and 0.05) and temperatures (T=1150, 1175 and 1200°C). Deformation of the heat-treated state revealed lower flow stress (in both, peak stresses and steady state stresses) and fewer voids compared to the HIP state (Fig. 1.a). The compression test data were used to develop material and temperature specific strain rate profiles based on a material model. Subsequently, hot compression tests were performed with different strain rate profiles (starting strain rates 0.0013 and 0.0052) for the HIP and the HT state. The results were evaluated with regard to their microstructure, deformation, and damage behavior. A reduction of the processing time for all tested strain rates profiles by factors 2-3 could be achieved compared to constant strain rates. Furthermore, the results indicated that the deformation with strain rate profiles (compared to constant strain rates) did not significantly change the resulting microstructure or damage tolerance of the HT state.}, language = {en} } @misc{BrykarczykLenzNeumannetal., author = {Brykarczyk, Daniel and Lenz, Wolfgang and Neumann, Andreas and Bambach, Markus}, title = {Erh{\"o}hung der Lebensdauer metallischer Strahlheizrohre durch den Einsatz strukturierter Bleche}, series = {Prozessw{\"a}rme}, volume = {4}, journal = {Prozessw{\"a}rme}, issn = {2567-3742}, language = {de} } @misc{LenzBrykarczykPfeiferetal., author = {Lenz, Wolfgang and Brykarczyk, Daniel and Pfeifer, Herbert and Neumann, Andreas and Bambach, Markus}, title = {Theoretical limits of the increase of radiative heat transfer by increased surface areas of radiant tubes}, series = {Applied Thermal Engineering}, volume = {Vol. 184}, journal = {Applied Thermal Engineering}, issn = {1359-4311}, doi = {10.1016/j.applthermaleng.2020.116246}, pages = {7}, language = {en} } @misc{StendalEisentrautSizovaetal., author = {Stendal, Johan Andreas and Eisentraut, Mark and Sizova, Irina and Bolz, Sebastian and Weiß, Sabine and Bambach, Markus}, title = {Accelerated hot deformation and heat treatment of the TiAl alloy TNM-B1 for enhanced hot workability and controlled damage}, series = {Journal of Materials Processing Technology}, volume = {Vol. 291}, journal = {Journal of Materials Processing Technology}, issn = {0924-0136}, doi = {10.1016/j.jmatprotec.2020.116999}, pages = {12}, language = {en} } @misc{HemesMeinersSizovaetal., author = {Hemes, Susanne and Meiners, Frank and Sizova, Irina and Hama-Saleh, Rebar and R{\"o}hrens, Daniel and Weisheit, Andreas and H{\"a}fner, Constantin Leon and Bambach, Markus}, title = {Microstructures and Mechanical Properties of Hybrid, Additively Manufactured Ti6Al4V after Thermomechanical Processing}, series = {Materials}, volume = {14}, journal = {Materials}, number = {4}, issn = {1996-1944}, doi = {10.3390/ma14041039}, language = {en} } @misc{BlumbergLiBesongetal., author = {Blumberg, Julian and Li, Zhoulong and Besong, Lemopi Isidore and Polte, Mitchel and Buhl, Johannes and Uhlmann, Eckart and Bambach, Markus}, title = {Deformation error compensation of industrial robots in single point incremental forming by means of data-driven stiffness model}, series = {26th International Conference on Automation and Computing (ICAC), 2-4 Sept. 2021, Portsmouth, United Kingdom}, journal = {26th International Conference on Automation and Computing (ICAC), 2-4 Sept. 2021, Portsmouth, United Kingdom}, isbn = {978-1-86043-557-7}, doi = {10.23919/ICAC50006.2021.9594138}, pages = {6}, language = {en} } @misc{BambachSizovaSzyndleretal., author = {Bambach, Markus and Sizova, Irina and Szyndler, Joanna and Bennett, Jennifer and Hyatt, Greg and Cao, Jian and Papke, Thomas and Merklein, Marion}, title = {On the hot deformation behavior of Ti-6Al-4V made by additive manufacturing}, series = {Journal of Materials Processing Technology}, volume = {288}, journal = {Journal of Materials Processing Technology}, issn = {0924-0136}, doi = {10.1016/j.jmatprotec.2020.116840}, language = {en} } @misc{SizovaSviridovBambachetal., author = {Sizova, Irina and Sviridov, Alexander and Bambach, Markus and Eisentraut, Mark and Hemes, Susanne and Hecht, Ulrike and Marquardt, Axel and Leyens, Christoph}, title = {A study on hot-working as alternative post-processing method for titanium aluminides built by laser powder bed fusion and electron beam melting}, series = {Journal of Materials Processing Technology}, volume = {291}, journal = {Journal of Materials Processing Technology}, issn = {0924-0136}, doi = {10.1016/j.jmatprotec.2020.117024}, pages = {14}, language = {en} } @misc{BambachImranSizovaetal., author = {Bambach, Markus and Imran, Muhammad and Sizova, Irina and Buhl, Johannes and Gerster, Stephan and Herty, Michael}, title = {A soft sensor for property control in multi-stage hot forming based on a level set formulation of grain size evolution and machine learning}, series = {Advances in Industrial and Manufacturing Engineering}, journal = {Advances in Industrial and Manufacturing Engineering}, number = {2}, issn = {2666-9129}, doi = {10.1016/j.aime.2021.100041}, pages = {13}, language = {en} }