TY - CONF AU - Behler, Felix ID - 44255 T2 - Barockwerkstatt 2021. Organisation: Professor Sabine Meine (Hochschule für Musik und Tanz Köln) TI - The Battle for the English Landscape’ - Über die gedankliche Konzeptionierung des Englischen Landschaftsgartens ER - TY - CONF AU - Behler, Felix ID - 44253 T2 - Somewhere In Between: Borders and Borderlands. Organisation: London Centre for Interdisciplinary Research TI - Of Transgenerational Borders and Collective Trauma ER - TY - CONF AU - Behler, Felix ID - 44252 T2 - Faces of War International Conference. Organisation: London Centre for Interdisciplinary Research. TI - Representations of Trauma in Contemporary British War Poetry ER - TY - CONF AU - Behler, Felix ID - 44257 T2 - BRITCULT 2021: Investigating the Super-Rich. Organisation: Professor Oliver v. Knebel Doeberitz, Dr. Jonatan Jalle Steller (University of Leipzig) TI - In Between Cultural Heritage and ‘Playground’ for the Wealthy: The Evolution of the British Countryside ER - TY - GEN ED - Behler, Felix ED - Jende, Yvonne Kristin ED - Büsken, Lisa-Marie ED - Rasmussen, Cecilie ID - 44263 TI - Bridges and Barriers, Interdisziplinäre studentische Konferenz ER - TY - CONF AU - Göddecke, Johannes AU - Meschut, Gerson ID - 22264 T2 - 11. Doktorandenseminar Klebtechnik TI - Experimentelle Untersuchung der Dämpfungseigenschaften geklebter Strukturen unter dynamischer Beanspruchung ER - TY - CHAP AB - Self-piercing riveting is an established technique for joining multi-material structures in car body manufacturing. Rivets for self-piercing riveting differ in their geometry, the material used, the condition of the material and their surface condition. To shorten the manufacturing process by omitting the heat treatment and the coating process, the authors have elaborated a concept for the use of stainless steel with high strain hardening as a rivet material. The focus of the present investigation is on the evaluation of the influences of the rivet’s geometry and material on its deformation behaviour. Conventional rivets of types P and HD2, a rivet with an improved geometry made of treatable steel 38B2, and rivets made of the stainless steels 1.3815 and 1.4541 are examined. The analysis is conducted by means of multi-step joining tests for two material combinations comprising high-strength steel HCT70X and aluminium EN AW-5083. The joints are cut to provide a cross-section and the deformation behaviour of the different rivets is analysed on the basis of the measured changes in geometry and hardness. In parallel, an examination of the force-stroke curves provides further insights. It can be demonstrated that, besides the geometry, the material strength, in particular, has a significant influence on the deformation behaviour of the rivet. The strength of steel 1.4541 is seen to be too low for the joining task, while the strength of steel 1.3815 is sufficient, and hence the investigation confirms the capability of rivets made of 1.3815 for joining even challenging material combinations. AU - Uhe, Benedikt AU - Kuball, Clara-Maria AU - Merklein, Marion AU - Meschut, Gerson ED - Daehn, Glenn ED - Cao, Jian ED - Kinsey, Brad ED - Tekkaya, Erman ED - Vivek, Anupam ED - Yoshida, Yoshinori ID - 22930 KW - Self-piercing riveting KW - Lightweight design KW - Deformation behaviour KW - Stainless steel KW - High nitrogen steel T2 - Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity. The Minerals, Metals & Materials Series. TI - Self-Piercing Riveting Using Rivets Made of Stainless Steel with High Strain Hardening ER - TY - CONF AB - The use of high-strength steel and aluminium is rising due to the intensified efforts being made in lightweight design, and self-piercing riveting is becoming increasingly important. Conventional rivets for self-piercing riveting differ in their geometry, the material used, the condition of the material and the coating. To shorten the manufacturing process, the use of stainless steel with high strain hardening as the rivet material represents a promising approach. This allows the coating of the rivets to be omitted due to the corrosion resistance of the material and, since the strength of the stainless steel is achieved by cold forming, heat treatment is no longer required. In addition, it is possible to adjust the local strength within the rivet. Because of that, the authors have elaborated a concept for using high nitrogen steel 1.3815 as the rivet material. The present investigation focusses on the joint strength in order to evaluate the capability of rivets in high nitrogen steel by comparison to conventional rivets made of treatable steel. Due to certain challenges in the forming process of the high nitrogen steel rivets, deviations result from the targeted rivet geometry. Mainly these deviations cause a lower joint strength with these rivets, which is, however, adequate. All in all, the capability of the new rivet is proven by the results of this investigation. AU - Uhe, Benedikt AU - Kuball, Clara-Maria AU - Merklein, Marion AU - Meschut, Gerson ID - 22274 KW - Self-piercing Riveting KW - Joining Technology KW - Rivet Geometry KW - Rivet Material KW - High Nitrogen Steel KW - Joint Strength TI - Strength of self-piercing riveted Joints with conventional Rivets and Rivets made of High Nitrogen Steel ER - TY - JOUR AB - The number of multi-material joints is increasing as a result of lightweight design. Self-piercing riveting (SPR) is an important mechanical joining technique for multi-material structures. Rivets for SPR are coated to prevent corrosion, but this coating also influences the friction that prevails during the joining process. The aim of the present investigation is to evaluate this influence. The investigation focuses on the common rivet coatings Almac® and zinc-nickel with topcoat as well as on uncoated rivet surfaces. First of all, the coating thickness and the uniformity of the coating distribution are analysed. Friction tests facilitate the classification of the surface properties. The influence of the friction on the characteristic joint parameters and the force-stroke curves is analysed by means of experimental joining tests. More in-depth knowledge of the effects that occur is achieved through the use of numerical simulation. Overall, it is shown that the surface condition of the rivet has an impact on the friction during the joining process and on the resulting joint. However, the detected deviations between different surface conditions do not restrict the operational capability of SPR and the properties of uncoated rivet surfaces, in particular, are similar to those of Almac®-coated rivets. It can thus be assumed that SPR with respect to the joining process is also possible without rivet coating in principle. AU - Uhe, Benedikt AU - Kuball, Clara-Maria AU - Merklein, Marion AU - Meschut, Gerson ID - 22272 JF - Key Engineering Materials KW - Coating KW - Friction KW - Joining TI - Influence of the Rivet Coating on the Friction during Self-Piercing Riveting VL - 883 ER - TY - GEN AU - Kuball, Clara-Maria AU - Uhe, Benedikt AU - Meschut, Gerson AU - Merklein, Marion ID - 30845 TI - Selective application of different forming temperatures for individual process stages in a rivet manufacturing process with high nitrogen steel ER - TY - JOUR AB - The mechanical properties of joined structures are determined considerably by the chosen joining technology. With the aim of providing a method that enables a faster and more profound decision-making in the spatial distribution of joining points during product development, a new method for the load path analysis of joining points is presented. For an exemplary car body, the load type in the joining elements, i.e. pure tensile, shear and combined tensile-shear loads, is determined using finite element analysis (FEA). Based on the evaluated loads, the resulting load paths in selected joining points are analyzed using a 2D FE-model of a clinching point. State of the art methods for load path analysis are dependent on the selected coordinate system or the existing stress state. Thus, a general statement about the load transmission path is not possible at this time. Here, a novel method for the analysis of load paths is used, which is independent of the alignment of the analyzed geometry. The basic assumption of the new load path analysis method was confirmed by using a simple specimen with a square hole in different orientations. The results presented here show a possibility to display the load transmission path invariantly. In further steps, the method will be extended for 3D analysis and the investigation of more complex assemblies. The primary goal of this methodical approach is an even load distribution over the joining elements and the component. This will provide a basis for future design approaches aimed at reducing the number of joining elements in joined structures. AU - Steinfelder, Christian AU - Martin, Sven AU - Brosius, Alexander AU - Tröster, Thomas ID - 24541 JF - Key Engineering Materials SN - 1662-9795 TI - Load Path Transmission in Joining Elements ER - TY - JOUR AU - Martin, Sven AU - Tröster, Thomas ID - 24548 JF - ESAFORM 2021 TI - Joint point loadings in car bodies – the influence of manufacturing tolerances and scatter in material properties ER - TY - CONF AU - Stallmeister, Tim AU - Martin, Sven AU - Marten, Thorsten AU - Tröster, Thomas ID - 26994 TI - Experimental investigation on lightweight potentials of fiber-metal-laminates for automotive battery cases ER - TY - CONF AU - Dörner, Marius AU - Schöppner, Volker ID - 23835 T2 - ANTEC 21 TI - Development of an Analytical Mathematical Modelling Approach for a More Precise Description of Disperse Melting in Solid Bed Breaking Screw Concepts ER - TY - JOUR AU - Moritzer, Elmar AU - Richters, Maximilian ID - 31769 IS - 12 JF - Journal of Composites Science SN - 2504-477X TI - Injection Molding of Wood-Filled Thermoplastic Polyurethane ER - TY - JOUR AU - Moritzer, Elmar AU - Krassmann, Dimitri ID - 31757 JF - Welding in the World TI - Development of a new joining technology for hybrid joints of sheet metal and continuous fiber-reinforced thermoplastics ER - TY - CONF AU - Rozo Vasquez, Julian AU - Arian, Bahman AU - Riepold, Markus AU - Walther, Frank AU - Homberg, Werner AU - Trächtler, Ansgar ID - 30297 T2 - Proceedings of the 11th International Work­shop NDT in Progress TI - Magnetic Barkhausen noise analysis for microstructural effects separation during flow forming of metastable austenite 304L. ER - TY - CONF AB - 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. AU - Arian, Bahman AU - Homberg, Werner AU - Riepold, Markus AU - Trächtler, Ansgar AU - Rozo Vasquez, Julian AU - Walther, Frank ID - 23465 KW - Flow-forming KW - Spinning KW - Process Strategy KW - Martensite Content KW - Property Control KW - Micromagnetic Measurement KW - Metastable Austenitic Stainless Steel SN - 978-2-87019-302-0 TI - Forming of metastable austenitic stainless steel tubes with axially graded martensite content by flow-forming ER - TY - CHAP AU - Ahrens, Stephan ED - Jakob, Reinhard ID - 44367 T2 - Lichtspiele. Kino und Film im Brucker Land von den Anfängen bis zum Siegeszug des Fernsehens. TI - Francesco (Franz) Stefani - Ein Regisseur mit barocken Anklägen. ER - TY - JOUR AB - AbstractIn child–robot interaction (cHRI) research, many studies pursue the goal to develop interactive systems that can be applied in everyday settings. For early education, increasingly, the setting of a kindergarten is targeted. However, when cHRI and research are brought into a kindergarten, a range of ethical and related procedural aspects have to be considered and dealt with. While ethical models elaborated within other human–robot interaction settings, e.g., assisted living contexts, can provide some important indicators for relevant issues, we argue that it is important to start developing a systematic approach to identify and tackle those ethical issues which rise with cHRI in kindergarten settings on a more global level and address the impact of the technology from a macroperspective beyond the effects on the individual. Based on our experience in conducting studies with children in general and pedagogical considerations on the role of the institution of kindergarten in specific, in this paper, we enfold some relevant aspects that have barely been addressed in an explicit way in current cHRI research. Four areas are analyzed and key ethical issues are identified in each area: (1) the institutional setting of a kindergarten, (2) children as a vulnerable group, (3) the caregivers’ role, and (4) pedagogical concepts. With our considerations, we aim at (i) broadening the methodology of the current studies within the area of cHRI, (ii) revalidate it based on our comprehensive empirical experience with research in kindergarten settings, both laboratory and real-world contexts, and (iii) provide a framework for the development of a more systematic approach to address the ethical issues in cHRI research within kindergarten settings. AU - Tolksdorf, Nils Frederik AU - Siebert, Scarlet AU - Zorn, Isabel AU - Horwath, Ilona AU - Rohlfing, Katharina J. ID - 24901 JF - International Journal of Social Robotics SN - 1875-4791 TI - Ethical Considerations of Applying Robots in Kindergarten Settings: Towards an Approach from a Macroperspective ER -