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 -