@inproceedings{30297, author = {{Rozo Vasquez, Julian and Arian, Bahman and Riepold, Markus and Walther, Frank and Homberg, Werner and Trächtler, Ansgar}}, booktitle = {{Proceedings of the 11th International Work­shop NDT in Progress}}, location = {{Prague}}, title = {{{Magnetic Barkhausen noise analysis for microstructural effects separation during flow forming of metastable austenite 304L.}}}, year = {{2021}}, } @inproceedings{23465, abstract = {{One of the main objectives of production engineering is to reproducibly manufacture (complex) defect-free parts. To achieve this, it is necessary to employ an appropriate process or tool design. While this will generally prove successful, it cannot, however, offset stochastic defects with local variations in material properties. Closed-loop process control represents a promising approach for a solution in this context. The state of the art involves using this approach to control geometric parameters such as a length. So far, no research or applications have been conducted with closed-loop control for microstructure and product properties. In the project on which this paper is based, the local martensite content of parts is to be adjusted in a highly precise and reproducible manner. The forming process employed is a special, property-controlled flow-forming process. A model-based controller is thus to generate corresponding correction values for the tool-path geometry and tool-path velocity on the basis of online martensite content measurements. For the controller model, it is planned to use a special process or microstructure (correlation) model. The planned paper not only describes the experimental setup but also presents results of initial experimental investigations for subsequent use in the closed-loop control of α’-martensite content during flow-forming.}}, author = {{Arian, Bahman and Homberg, Werner and Riepold, Markus and Trächtler, Ansgar and Rozo Vasquez, Julian and Walther, Frank}}, isbn = {{978-2-87019-302-0}}, keywords = {{Flow-forming, Spinning, Process Strategy, Martensite Content, Property Control, Micromagnetic Measurement, Metastable Austenitic Stainless Steel}}, location = {{Liège, Belgium}}, publisher = {{ULiège Library}}, title = {{{Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming}}}, year = {{2021}}, } @article{24383, author = {{Wübbeke, Andrea and Schöppner, Volker and Arndt, Theresa and Maras, Jan-Ole and Fitze, Marcus and Moltzahn, Christian and Wu, Tao and Niendorf, Thomas}}, journal = {{Polymers}}, publisher = {{MDPI}}, title = {{{Effect of nucleating additives on short- and long-term tensile strength and residual stresses of welded polypropylene samples }}}, year = {{2021}}, } @phdthesis{37632, author = {{Wübbeke, Andrea}}, title = {{{Prozess-Struktur-Eigenschaftsbeziehung beim Heizelementschweißen von Polypropylen}}}, year = {{2021}}, } @inbook{30296, author = {{Wiens, Eugen and Homberg, Werner and Arian, Bahman and Möhring, Kerstin and Walther, Frank}}, booktitle = {{Forming the Future}}, isbn = {{9783030753801}}, issn = {{2367-1181}}, location = {{Virtual Event}}, publisher = {{Springer International Publishing}}, title = {{{Forming of Parts with Locally Defined Mechanical and Ferromagnetic Properties by Flow-Forming}}}, doi = {{10.1007/978-3-030-75381-8_160}}, year = {{2021}}, } @article{26082, author = {{Wischer, Christian and Wiens, Eugen and Homberg, Werner}}, issn = {{2666-3309}}, journal = {{Journal of Advanced Joining Processes}}, publisher = {{Elsevier}}, title = {{{Joining with versatile joining elements formed by friction spinning}}}, doi = {{10.1016/j.jajp.2021.100060}}, volume = {{3}}, year = {{2021}}, } @proceedings{22453, editor = {{Wiens, Eugen and Wischer, Christian and Homberg, Werner}}, title = {{{Development of a novel adaptive joining technology employing Friction-Spun Joint Connectors (FSJC)}}}, doi = {{10.25518/esaform21.4682}}, year = {{2021}}, } @inproceedings{24280, abstract = {{Challenges in decisions on technical changes are the lack of knowledge about the expected impact and change propagation. Currently, no literature study contains a systematic differentiation and evaluation of existing approaches, which is a prerequisite for practitioners to select a suitable approach. This research aims at defining differentiation criteria as well as generally applicable requirements for evaluation. A four-step approach is used: systematic literature review on approaches for impact analysis of engineering changes (1), categorization and prioritization of approaches based on reoccuring elements (2), derivation of context specific requirements for evaluation (3), and evaluation of approaches (4). The result indicates existing potential of object-oriented modeling approaches.}}, author = {{Gräßler, Iris and Wiechel, Dominik}}, booktitle = {{DS 111: Proceedings of the 32nd Symposium Design for X}}, editor = {{Krause, Dieter and Paetzold, Kristin and Wartzack, Sandro}}, keywords = {{Engineering Change Management, Impact Analysis, Engineering Changes, Model-based Systems Engineering, Product Developmen}}, location = {{Tutzing}}, title = {{{Systematische Bewertung von Auswirkungsanalysen des Engineering Change Managements}}}, doi = {{10.35199/dfx2021.12}}, year = {{2021}}, } @inproceedings{26866, author = {{Gräßler, Iris and Roesmann, Daniel and Wiechel, Dominik and Preuß, Daniel and Pottebaum, Jens}}, booktitle = {{54th CIRP Conference on Manufacturing Systems}}, location = {{Athens}}, title = {{{Determine similarity of assembly operations using semantic technology}}}, doi = {{https://doi.org/10.1016/j.procir.2021.11.209 }}, year = {{2021}}, } @inproceedings{24080, abstract = {{Challenges of the development of mechatronic systems and corresponding production systems have increased steadily. Changes are primarily due to increased product complexity and the connection to the internet of things and services, enabling Cyber-Physical Systems (CPS) and Cyber-Physical Production Systems (CPPS). Major innovations of the revised VDI guideline 2206 for developing mechatronic systems are systems thinking as a core element and six checkpoints for structuring deliverables along the V-Model. These checkpoints serve for orientation in result progress and thus enable a structured and complete development process. However, tasks and checkpoints of the new guideline focus on the product development itself without integrating the development of related CPPS, enabling optimization simultaneously to system development. Implications are derived by a three-step analysis. The paper at hand contributes fundamental extensions of the checkpoint questions regarding integrated CPPS development. These questions provide methodical support for system developers of CPPS for CPS by enabling the project manager to check the status, schedule further development steps and evaluate the maturity of the whole, integrated development.}}, author = {{Gräßler, Iris and Wiechel, Dominik and Roesmann, Daniel and Thiele, Henrik}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, keywords = {{Cyber-Physical Production System (CPPS), V-Model, Product System Development, Integrated Development, VDI 2206}}, pages = {{253--258}}, title = {{{V-model based development of cyber-physical systems and cyber-physical production systems}}}, doi = {{10.1016/j.procir.2021.05.119}}, year = {{2021}}, } @inproceedings{24281, abstract = {{In order to optimize production processes and to avoid errors, it is not only necessary to automate processes, but also to integrate workers with their individual personality and skill profiles. For this purpose, human factors should be considered in the entire design process. The integrated view of mental human models, the cognitive demand of the working environment and the automation design is essential. Human-System Integration (HSI) constitutes a promising approach. Current model-based approaches offer possibilities to analyze and optimize tasks within an overall system, but they still lack integration. This leads to the research question: How can human factors be integrated into a system model of a socio-technical, Cyber-Physical Production System? The paper at hand contributes an approach of human factor integration into the procedure of Model-Based Systems Engineering for Cyber-Physical Production Systems (CPPS). The approach combines a system model of a CPPS with HSI concepts. In accordance to the benefits of MBSE, SysML is selected to integrate human factors in the development process of a CPPS. The approach is divided into five steps, which includes the extension of the SysML meta model. This allows the optimization of skill-based human-machine interaction. Defined HSI-Profiles enable system developers to integrate employee requirements at early stages within the development process. The approach is demonstrated by the maintenance of a 3D-Printer as a case example. This research enables system developers to depict individual workers with the help of the developed concepts and systematically integrate them into the development process of a CPPS.}}, author = {{Gräßler, Iris and Wiechel, Dominik and Roesmann, Daniel}}, booktitle = {{Procedia CIRP}}, issn = {{2212-8271}}, pages = {{518--523}}, title = {{{Integrating human factors in the model based development of cyber-physical production systems}}}, doi = {{10.1016/j.procir.2021.05.113}}, year = {{2021}}, } @inproceedings{24444, author = {{Hesse, Philipp and Gräßler, Iris}}, booktitle = {{Digitalisierung im Kontext von Nachhaltigkeit und Klimawandel}}, editor = {{Biedermann, Hubert and Posch, Wolfgang and Vorbach, Stefan}}, pages = {{135--148}}, publisher = {{Nomos Verlagsgesellschaft}}, title = {{{Digitaler Zwilling zur Gestaltung der Prozesse im End-of-Life}}}, doi = {{10.5771/9783957102966-135}}, volume = {{9}}, year = {{2021}}, } @misc{27680, author = {{Gräßler, Iris and Hentze, Julian and Hesse, Philipp and Preuß, Daniel and Thiele, Henrik and Wiechel, Dominik and Bothen, Martin and Bruckmann, Tobias and Dattner, Michael and Ehl, Thomas and Hawlas, Martin and Krimpmann, Christoph and Lachmayer, Roland and Knöchelmann, Marvin and Mock, Randolf and Mozgova, Iryna and Schneider, Maximilian and Stollt, Guido}}, pages = {{67}}, publisher = {{Ed.: VDI/VDE-Gesellschaft Mess- und Automatisierungstechnik}}, title = {{{VDI/VDE 2206 - Entwicklung mechatronischer und cyber-physischer Systeme}}}, year = {{2021}}, } @misc{42989, author = {{Dewerth, Mats-Ole and Neukötter, Moritz}}, title = {{{Entwicklung eines Versuchsaufbaus zur rheo-optischen Untersuchung des Dehnverhaltens von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer (Studienarbeit)}}}, year = {{2021}}, } @misc{43004, author = {{Hütte, Marvin and Neukötter, Moritz}}, title = {{{Weiterentwicklung des Versuchsaufbaus zur Untersuchung von Polymerschmelzen und -lösungen am Hochdruck-Kapillarrheometer}}}, year = {{2021}}, } @article{24009, abstract = {{Heat-assisted forming processes are becoming increasingly important in the manufacturing of sheet metal parts for body-in-white applications. However, the non-isothermal nature of these processes leads to challenges in evaluating the forming limits, since established methods such as Forming Limit Curves (FLCs) only allow the assessment of critical forming strains for steady temperatures. For this reason, a temperature-dependent extension of the well-established GISSMO (Generalized Incremental Stress State Dependent Damage Model) fracture indicator framework is developed by the authors to predict forming failures under non-isothermal conditions. In this paper, a general approach to combine several isothermal FLCs within the temperature-extended GISSMO model into a temperature-dependent forming limit surface is investigated. The general capabilities of the model are tested in a coupled thermo-mechanical FEA using the example of warm forming of an AA5182-O sheet metal cross-die cup. The obtained results are then compared with state of the art of evaluation methods. By taking the strain and temperature path into account, GISSMO predicts greater drawing depths by up to 20% than established methods. In this way the forming and so the lightweight potential of sheet metal parts can by fully exploited. Moreover, the risk and locus of failure can be evaluated directly on the part geometry by a contour plot. An additional advantage of the GISSMO model is the applicability for low triaxialities as well as the possibility to predict the materials behavior beyond necking up to ductile fracture.}}, author = {{Camberg, Alan Adam and Erhart, Tobias and Tröster, Thomas}}, issn = {{1996-1944}}, journal = {{Materials}}, title = {{{A Generalized Stress State and Temperature Dependent Damage Indicator Framework for Ductile Failure Prediction in Heat-Assisted Forming Operations}}}, doi = {{10.3390/ma14175106}}, year = {{2021}}, } @article{41511, author = {{Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0933-5137}}, journal = {{Materialwissenschaft und Werkstofftechnik}}, keywords = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}}, number = {{7}}, pages = {{703--716}}, publisher = {{Wiley}}, title = {{{Additively processed TiAl6Nb7 alloy for biomedical applications}}}, doi = {{10.1002/mawe.202000288}}, volume = {{52}}, year = {{2021}}, } @article{41507, abstract = {{ Purpose The currently existing restrictions regarding the deployment of additively manufactured components because of poor surface roughness, porosity and residual stresses as well as their influence on the low-cycle fatigue (LCF) strength are addressed in this paper. Design/methodology/approach This study aims to evaluating the effect of different pre- and post-treatments on the LCF strength of additively manufactured 316L parts. Therefore, 316L specimens manufactured by laser powder bed fusion were examined in their as-built state as well as after grinding, or coating with regard to the surface roughness, residual stresses and LCF strength. To differentiate between topographical effects and residual stress-related phenomena, stress-relieved 316L specimens served as a reference throughout the investigations. To enable an alumina coating of the 316L components, atmospheric plasma spraying was used, and the near-surface residual stresses and the surface roughness are measured and investigated. Findings The results have shown that the applied pre- and post-treatments such as stress-relief heat treatment, grinding and alumina coating have each led to an increase in LCF strength of the 316L specimens. In contrast, the non-heat-treated specimens predominantly exhibited coating delamination. Originality/value To the best of the authors’ knowledge, this is the first study of the correlation between the LCF behavior of additively manufactured uncoated 316L specimens in comparison with additively manufactured 316L specimens with an alumina coating. }}, author = {{Garthe, Kai-Uwe and Hoyer, Kay-Peter and Hagen, Leif and Tillmann, Wolfgang and Schaper, Mirko}}, issn = {{1355-2546}}, journal = {{Rapid Prototyping Journal}}, keywords = {{Industrial and Manufacturing Engineering, Mechanical Engineering}}, number = {{5}}, pages = {{833--840}}, publisher = {{Emerald}}, title = {{{Correlation between pre- and post-treatments of additively manufactured 316L parts and the resulting low cycle fatigue behavior}}}, doi = {{10.1108/rpj-01-2021-0017}}, volume = {{28}}, year = {{2021}}, } @article{41506, abstract = {{Processing aluminum alloys employing powder bed fusion of metals (PBF-LB/M) is becoming more attractive for the industry, especially if lightweight applications are needed. Unfortunately, high-strength aluminum alloys such as AA7075 are prone to hot cracking during PBF-LB/M, as well as welding. Both a large solidification range promoted by the alloying elements zinc and copper and a high thermal gradient accompanied with the manufacturing process conditions lead to or favor hot cracking. In the present study, a simple method for modifying the powder surface with titanium carbide nanoparticles (NPs) as a nucleating agent is aimed. The effect on the microstructure with different amounts of the nucleating agent is shown. For the aluminum alloy 7075 with 2.5 ma% titanium carbide nanoparticles, manufactured via PBF-LB/M, crack-free samples with a refined microstructure having no discernible melt pool boundaries and columnar grains are observed. After using a two-step ageing heat treatment, ultimate tensile strengths up to 465 MPa and an 8.9% elongation at break are achieved. Furthermore, it is demonstrated that not all nanoparticles used remain in the melt pool during PBF-LB/M.}}, author = {{Heiland, Steffen and Milkereit, Benjamin and Hoyer, Kay-Peter and Zhuravlev, Evgeny and Kessler, Olaf and Schaper, Mirko}}, issn = {{1996-1944}}, journal = {{Materials}}, keywords = {{General Materials Science}}, number = {{23}}, publisher = {{MDPI AG}}, title = {{{Requirements for Processing High-Strength AlZnMgCu Alloys with PBF-LB/M to Achieve Crack-Free and Dense Parts}}}, doi = {{10.3390/ma14237190}}, volume = {{14}}, year = {{2021}}, } @article{24790, abstract = {{Implants often overtake body function just for a certain time and remain as an unnecessary foreign body or have to be removed. Thus, resorbable implants are highly beneficial to reduce patient burden. Besides established materials, Iron-(Fe)-based alloys are in focus due to superior mechanical properties and good biocompatibility. However, their degradation rate needs to be increased. Phases with high electrochemical potential could promote the dissolution of residual material based on the galvanic coupling. Silver (Ag) is promising due to its high electrochemical potential (+0.8 V vs. SHE), immiscibility with Fe, biocompatibility, and anti-bacterial properties. But to prevent adverse consequences the Ag-particles, remaining after dissolution of the matrix, need to dissolve. Thus, a bioresorbable Ag-alloy is required. Regarding the electrochemical potential and degradation behavior of binary alloys, Cerium (Ce) and Lanthanum (La) are well-suited considering their biocompatibility and antibacterial behavior. Accordingly, this research addresses AgCe and AgCeLa alloys as additives for Fe-based materials with adapted degradation behavior. Furthermore, degradable Ag-alloys combined with inert implant materials could enable the controlled release of antibacterial active Ag-ions.}}, author = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Schaper, Mirko}}, issn = {{0167-577X}}, journal = {{Materials Letters}}, title = {{{Bioresorbable AgCe and AgCeLa alloys for adapted Fe-based implants}}}, doi = {{10.1016/j.matlet.2021.130890}}, volume = {{306}}, year = {{2021}}, }