@misc{BambachSizovaEmdadi, author = {Bambach, Markus and Sizova, Irina and Emdadi, Aliakbar}, title = {Towards Damage Controlled Hot Forming}, series = {Applied Mechanics and Materials}, volume = {85}, journal = {Applied Mechanics and Materials}, issn = {1662-7482}, doi = {10.4028/www.scientific.net/AMM.885.56}, pages = {56 -- 63}, language = {en} } @misc{BambachSizovaEmdadi, author = {Bambach, Markus and Sizova, Irina and Emdadi, Aliakbar}, title = {Development of a processing route for Ti-6Al-4V forgings based on preforms made by selective laser melting}, series = {Journal of Manufacturing Processes}, volume = {37}, journal = {Journal of Manufacturing Processes}, issn = {1526-6125}, doi = {10.1016/j.jmapro.2018.11.011}, pages = {150 -- 158}, language = {en} } @misc{HartRawungBuhlBambach, author = {Hart-Rawung, Thawin and Buhl, Johannes and Bambach, Markus}, title = {Extension of a phase transformation model for partial hardening in hot stamping}, series = {Journal of Machine Engineering}, volume = {18}, journal = {Journal of Machine Engineering}, number = {3}, issn = {1895-7595}, doi = {10.5604/01.3001.0012.4619}, pages = {87 -- 97}, language = {en} } @misc{BambachSizovaGeisenetal., author = {Bambach, Markus and Sizova, Irina and Geisen, Ole and Fergani, Omar}, title = {Comparison of the Hot Working Behavior of Wrought, Selective Laser Melted and Electron Beam Melted Ti-6Al-4V}, series = {Materials Science Forum; Trans Tech Publications}, volume = {941}, journal = {Materials Science Forum; Trans Tech Publications}, issn = {1662-9752}, doi = {10.4028/www.scientific.net/MSF.941.2030}, pages = {2030 -- 2036}, language = {en} } @misc{ImranAfzalBambach, author = {Imran, Muhammad and Afzal, Muhammad Junaid and Bambach, Markus}, title = {Analysis of competition between onset of dynamic recrystallization and damage nucleation during hot forming}, series = {NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes}, journal = {NUMIFORM 2019: The 13th International Conference on Numerical Methods in Industrial Forming Processes}, isbn = {978-0-87339-769-8}, pages = {231 -- 234}, language = {en} } @misc{SanthanakrishnanBalakrishnanHartRawungBuhletal., author = {Santhanakrishnan Balakrishnan, Venkateswaran and Hart-Rawung, Thawin and Buhl, Johannes and Seidlitz, Holger and Bambach, Markus}, title = {Impact and damage behaviour of FRP-metal hybrid laminates made by the reinforcement of glass fibers on 22MnB5 metal surface}, series = {Composites Science and Technology}, volume = {Vol. 187}, journal = {Composites Science and Technology}, issn = {1879-1050}, doi = {10.1016/j.compscitech.2019.107949}, pages = {15}, language = {en} } @misc{ImranSzyndlerAfzaletal., author = {Imran, Muhammad and Szyndler, Joanna and Afzal, Muhammad Junaid and Bambach, Markus}, title = {Dynamic recrystallization-dependent damage modeling during hot forming}, series = {International Journal of Damage Mechanics}, volume = {29}, journal = {International Journal of Damage Mechanics}, number = {2}, issn = {1530-7921}, doi = {10.1177/1056789519848477}, pages = {335 -- 363}, language = {en} } @misc{BambachImran, author = {Bambach, Markus and Imran, Muhammad}, title = {Extended Gurson-Tvergaard-Needleman model for damage modeling and control in hot forming}, series = {Cirp Annals - Manufacturing Technology}, volume = {68}, journal = {Cirp Annals - Manufacturing Technology}, number = {1}, issn = {0007-8506}, doi = {10.1016/j.cirp.2019.04.063}, pages = {249 -- 252}, language = {en} } @misc{StendalBambachEisentrautetal., author = {Stendal, Johan Andreas and Bambach, Markus and Eisentraut, Mark and Sizova, Irina and Weiß, Sabine}, title = {Applying Machine Learning to the Phenomenological Flow Stress Modeling of TNM-B1}, series = {Metals}, volume = {9}, journal = {Metals}, number = {2}, issn = {2075-4701}, doi = {10.3390/met9020220}, pages = {18}, abstract = {Data-driven or machine learning approaches are increasingly being used in material science and research. Specifically, machine learning has been implemented in the fields of materials discovery, prediction of phase diagrams and material modelling. In this work, the application of machine learning to the traditional phenomenological flow stress modelling of the titanium aluminide (TiAl) alloy TNM-B1 (Ti-43.5Al-4Nb-1Mo-0.1B) is investigated. Three model types were developed, analyzed and compared; a physics-based phenomenological model (PM) originally developed for steel by Cingara and McQueen, a purely data-driven machine learning model (MLM), and a hybrid model (HM), which uses characteristic points predicted by a learning algorithm as input for the phenomenological model. The same amount of data was used to both fit the PM and train the MLM and HM. The models were analyzed and compared based on the accuracy of their predictions, development and computing time, and their ability to predict on interpolated and extrapolated inputs. The results revealed that for the same amount of experimental data, the MLM was more accurate than the PM. In addition, the MLM was better able to capture the characteristic peak stress in the TNM-B1 the flow curves, and could be developed and computed faster. Furthermore, the MLM was able to make realistic predictions for inputs outside the experimental data used for training. The HM showed comparable accuracy to the PM for the experimental conditions. However, the HM was able to produce a better fit for input conditions outside the training data.}, language = {en} } @misc{MaqboolHajavifardWaltheretal., author = {Maqbool, Fawad and Hajavifard, Ramin and Walther, Frank and Bambach, Markus}, title = {Engineering the residual stress state of the metastable austenitic stainless steel (MASS) disc springs by incremental sheet forming (ISF)}, series = {Production Engineering}, volume = {Vol. 13}, journal = {Production Engineering}, number = {2}, issn = {0944-6524}, doi = {10.1007/s11740-018-0864-6}, pages = {139 -- 148}, language = {en} } @misc{BesongBuhlBambach, author = {Besong, Lemopi Isidore and Buhl, Johannes and Bambach, Markus}, title = {Investigations on hole-flanging by paddle forming and a comparison with single point incremental forming}, series = {International Journal of Mechanical Sciences}, volume = {vol. 164}, journal = {International Journal of Mechanical Sciences}, issn = {0020-7403}, doi = {10.1016/j.ijmecsci.2019.105143}, pages = {17}, language = {en} } @misc{EisentrautBolzSizovaetal., author = {Eisentraut, Mark and Bolz, Sebastian and Sizova, Irina and Bambach, Markus and Weiß, Sabine}, title = {Development of a heat treatment strategy for the γ-TiAl based alloy TNM-B1 to increase the hot workability}, series = {SN Applied Sciences}, volume = {1}, journal = {SN Applied Sciences}, number = {11}, issn = {2523-3963}, doi = {10.1007/s42452-019-1563-4}, pages = {8}, language = {en} } @misc{StendalEisentrautSizovaetal., author = {Stendal, Johan Andreas and Eisentraut, Mark and Sizova, Irina and Bolz, Sebastian and Bambach, Markus and Weiß, Sabine}, title = {Effect of heat treatment on the workability of hot isostatically pressed TNM-B1}, series = {AIP Conference Proceedings}, volume = {2113}, journal = {AIP Conference Proceedings}, number = {1}, isbn = {978-0-7354-1847-9}, doi = {10.1063/1.5112544}, language = {en} } @misc{ImranSzyndlerAfzaletal., author = {Imran, Muhammad and Szyndler, Joanna and Afzal, Muhammad Junaid and Bambach, Markus}, title = {Towards the damage evolution for hot forming processes using Gurson-Tvergaard Needleman model - Coupled to dynamic recrystallization}, series = {AIP Conference Proceedings}, volume = {2113}, journal = {AIP Conference Proceedings}, number = {1}, isbn = {978-0-7354-1847-9}, doi = {10.1063/1.5112741}, language = {en} } @misc{MaqboolBambach, author = {Maqbool, Fawad and Bambach, Markus}, title = {Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses}, series = {Journal of Manufacturing and Materials Processing}, volume = {3}, journal = {Journal of Manufacturing and Materials Processing}, number = {2}, issn = {2504-4494}, doi = {10.3390/jmmp3020031}, pages = {22}, language = {en} } @misc{EmdadiSizovaBambachetal., author = {Emdadi, Aliakbar and Sizova, Irina and Bambach, Markus and Hecht, Ulrike}, title = {Hot deformation behavior of a spark plasma sintered Fe-25Al-1.5Ta alloy with strengthening Laves phase}, series = {Intermetallics}, volume = {Vol. 109}, journal = {Intermetallics}, issn = {0966-9795}, doi = {10.1016/J.intermet.2019.03.017}, pages = {123 -- 134}, language = {en} } @misc{BuhlIsrarBambach, author = {Buhl, Johannes and Israr, Rameez and Bambach, Markus}, title = {Modeling and convergence analysis of directed energy deposition simulations with hybrid implicit / explicit and implicit solutions}, series = {Journal of Machine Engineering}, volume = {Vol. 19}, journal = {Journal of Machine Engineering}, number = {3}, issn = {2391-8071}, doi = {10.5604/01.3001.0013.4086}, pages = {94 -- 107}, language = {en} } @misc{FuegenschuhBuhlBambach, author = {F{\"u}genschuh, Armin and Buhl, Johannes and Bambach, Markus}, title = {Trajectory Optimization for Wire-Arc Additive Manufacturing}, series = {Operations Research Proceedings 2018 ; selected papers of the Annual International Conference of the German Operations Research Society (GOR), Brussels, Belgium, September 12-14, 2018}, journal = {Operations Research Proceedings 2018 ; selected papers of the Annual International Conference of the German Operations Research Society (GOR), Brussels, Belgium, September 12-14, 2018}, editor = {Fortz, Bernard and Labb{\´e}, Martine}, publisher = {Springer}, address = {Cham}, isbn = {978-3-030-18499-5}, doi = {10.1007/978-3-030-18500-8}, pages = {331 -- 337}, language = {en} } @misc{BesongBuhlBambach, author = {Besong, Lemopi Isidore and Buhl, Johannes and Bambach, Markus}, title = {Paddle shape optimization for hole-flanging by paddle forming through the use of a predefined strain path in finite element analysis}, series = {Journal of Machine Engineering}, volume = {Vol. 19}, journal = {Journal of Machine Engineering}, number = {2}, issn = {1895-7595}, doi = {10.5604/01.3001.0013.2226}, pages = {83 -- 98}, language = {en} } @misc{HajavifardMaqboolSchmiedtKalenbornetal., author = {Hajavifard, Ramin and Maqbool, Fawad and Schmiedt-Kalenborn, Anke and Buhl, Johannes and Bambach, Markus}, title = {Integrated Forming and Surface Engineering of Disc Springs by Inducing Residual Stresses by Incremental Sheet Forming}, series = {Materials}, volume = {12}, journal = {Materials}, number = {10}, issn = {1996-1944}, doi = {10.3390/ma12101646}, pages = {19}, language = {en} } @misc{MaqboolHajavifardWaltheretal., author = {Maqbool, Fawad and Hajavifard, Ramin and Walther, Frank and Bambach, Markus}, title = {Experimental investigation and finite element modelling of residual stress control in disc springs made of metastable austenitic stainless steel (MASS) using incremental sheet forming (ISF)}, series = {Procedia Manufacturing}, volume = {Vol. 29}, journal = {Procedia Manufacturing}, issn = {2351-9789}, doi = {10.1016/j.promfg.2019.02.099}, pages = {12 -- 20}, language = {en} } @misc{BambachHerty, author = {Bambach, Markus and Herty, Michael}, title = {Model Predictive Control of the Punch Speed for Damage Reduction in Isothermal Hot Forming}, series = {Materials Science Forum}, volume = {949}, journal = {Materials Science Forum}, doi = {10.4028/www.scientific.net/MSF.949.1}, pages = {6}, language = {en} } @misc{SilzeSchnickSizovaetal., author = {Silze, Frank and Schnick, Michael and Sizova, Irina and Bambach, Markus}, title = {Laser Metal Deposition of Ti-6Al-4V with a Direct Diode Laser Set-up and Coaxial Material Feed}, series = {Procedia Manufacturing}, volume = {47}, journal = {Procedia Manufacturing}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.156}, pages = {1154 -- 1158}, language = {en} } @misc{KloeppelMertenHaufeetal., author = {Kl{\"o}ppel, Thomas and Merten, Mathias and Haufe, Andre and Buhl, Johannes and Bambach, Markus}, title = {On the Numerical Prediction of Process-Dependent Properties of Current High-Performance Materials with Material Model *MAT_254 in LS-DYNA}, series = {Procedia Manufacturing : 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing : 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.341}, pages = {1520 -- 1525}, language = {en} } @misc{NguyenBuhlBambach, author = {Nguyen, Lam and Buhl, Johannes and Bambach, Markus}, title = {Multi-bead Overlapping Models for Tool Path Generation in Wire-Arc Additive Manufacturing Processes}, 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.2020.04.129}, pages = {1123 -- 1128}, language = {en} } @misc{HamaSalehWeisheitSchleifenbaumetal., author = {Hama-Saleh, Rebar and Weisheit, Andreas and Schleifenbaum, Johannes Henrich and {\"U}nsal, Ismail and Sviridov, Alexander and Bambach, Markus}, title = {Formability Analysis of Micro-Alloyed Sheet Metals Reinforced by 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.2020.04.317}, pages = {1023 -- 1028}, language = {en} } @misc{MichlSydowBambach, author = {Michl, Dennis and Sydow, Benjamin and Bambach, Markus}, title = {Ring Rolling of Pre-forms Made by Wire-arc 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.2020.04.275}, pages = {342 -- 348}, language = {en} } @misc{MeinersIhneJuergensetal., author = {Meiners, Frank and Ihne, J{\"o}rg and J{\"u}rgens, Pascal and Hemes, Susanne and Mathes, Michael and Sizova, Irina and Bambach, Markus and Hama-Saleh, Rebar and Weisheit, Andreas}, title = {New Hybrid Manufacturing Routes Combining Forging and Additive Manufacturing to Efficiently Produce High Performance Components from Ti-6Al-4V}, 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.2020.04.215}, pages = {261 -- 267}, language = {en} } @misc{HartRawungBuhlBambach, author = {Hart-Rawung, Thawin and Buhl, Johannes and Bambach, Markus}, title = {A Fast Approach for Optimization of Hot Stamping Based on Machine Learning of Phase Transformation Kinetics}, 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.2020.04.218}, pages = {707 -- 712}, language = {en} } @misc{MishurovaSydowThiedeetal., author = {Mishurova, Tatjana and Sydow, Benjamin and Thiede, Tobias and Sizova, Irina and Ulbricht, Alexander and Bambach, Markus and Bruno, Giovanni}, title = {Residual Stress and Microstructure of a Ti-6Al-4V Wire Arc Additive Manufacturing Hybrid Demonstrator}, series = {Metals}, volume = {6}, journal = {Metals}, number = {10}, issn = {2075-4701}, doi = {10.3390/met10060701}, language = {en} } @misc{NguyenBuhlBambach, author = {Nguyen, Lam and Buhl, Johannes and Bambach, Markus}, title = {Continuous Eulerian tool path strategies for wire-arc additive manufacturing of rib-web structures with machine-learning-based adaptive void filling}, series = {Additive Manufacturing}, volume = {Vol. 35}, journal = {Additive Manufacturing}, issn = {2214-8604}, doi = {10.1016/j.addma.2020.101265}, pages = {17}, language = {en} } @misc{BambachSizovaSydowetal., author = {Bambach, Markus and Sizova, Irina and Sydow, Benjamin and Hemes, Susanne and Meiners, Frank}, title = {Hybrid manufacturing of components from Ti-6Al-4V by metal forming and wire-arc additive manufacturing}, series = {Journal of Materials Processing Technology}, journal = {Journal of Materials Processing Technology}, number = {Vol. 282}, issn = {0924-0136}, doi = {10.1016/j.jmatprotec.2020.116689}, pages = {8}, language = {en} } @misc{GagliardiAmbrogioConteetal., author = {Gagliardi, Francesco and Ambrogio, Giuseppina and Conte, Romina and Bambach, Markus}, title = {Extruded joining elements manufactured by friction stir forming: an investigation of the process parameters}, series = {The International Journal of Advanced Manufacturing Technology}, volume = {106}, journal = {The International Journal of Advanced Manufacturing Technology}, number = {11-12}, issn = {1433-3015}, doi = {10.1007/s00170-020-04992-w}, pages = {5559 -- 5570}, language = {en} } @misc{ImranAfzalBuhletal., author = {Imran, Muhammad and Afzal, Muhammad Junaid and Buhl, Johannes and Bambach, Markus and Dunlap, Anthony and Schwedt, Alexander and Aretz, Anke and Wang, Shuhan and Lohmar, Johannes and Hirt, Gerhard}, title = {Evaluation of process-induced damage based on dynamic recrystallization during hot caliber rolling}, series = {Production Engineering}, volume = {14}, journal = {Production Engineering}, number = {1}, issn = {1863-7353}, doi = {10.1007/s11740-019-00932-0}, pages = {5 -- 16}, language = {en} } @misc{AlimovSizovaBibaetal., author = {Alimov, Artem and Sizova, Irina and Biba, Nikolai and Bambach, Markus}, title = {Prediction of Mechanical Properties of Ti-6Al-4V Forgings Based on Simulation of Microstructure Evolution}, series = {Procedia Manufacturing : 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing : 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/J.promfg.2020.04.326}, pages = {1468 -- 1475}, language = {en} } @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} }