@article{24537,
  author       = {{Neuser, Moritz and Kappe, Fabian and Busch, M and Grydin, Olexandr and Bobbert, Mathias and Schaper, Mirko and Meschut, Gerson and Hausotte, T}},
  issn         = {{1757-8981}},
  journal      = {{IOP Conference Series: Materials Science and Engineering}},
  title        = {{{Joining suitability of cast aluminium for self-piercing riveting}}},
  doi          = {{10.1088/1757-899x/1157/1/012005}},
  year         = {{2021}},
}

@article{25556,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>In order to reduce fuel consumption and thus pollutant emissions, the automotive industry is increasingly developing lightweight construction concepts that are accompanied by an increasing usage of aluminum materials. Due to poor weldability of aluminum in combination with other materials, mechanical joining methods such as clinching were developed and established in series production. In order to predict the relevant characteristics of clinched joints and to ensure the reliability of the process, it is simulated numerically during product development processes. In this regard, the predictive accuracy of the simulated process highly depends on the implemented friction model. In particular, the frictional behavior between the sheet metals as well as between the sheet metal and clinching tools has a significant impact on the geometrical formation of the clinched joint. No testing methods exist that can sufficiently investigate the frictional behavior in sheet materials, especially under high interface pressures, different relative velocities, and long friction paths, while allowing a decoupled consideration of the test parameters. This paper describes the development of further testing concepts based on a proven tribo-torsion test method for determining friction coefficients between sheet metal materials for the simulation of clinching processes. For this purpose, the correlation of interface pressure and the relative velocity between aluminum and steel sheet material in clinching processes is investigated using numerical simulation. Based on these findings, the developed concepts focus on determining friction coefficients at interface pressures of the above materials, yield stress, as well as the reproduction of the occurring friction conditions between sheet metal materials and tool surfaces in clinching processes using tool substitutes. Furthermore, wear investigations between sheet metal material and tool surface were carried out in the friction tests with subsequent EDX analyses of the frictioned tool surfaces. The developed method also allows an optical deformation measurement of the sheet metal material specimen by means of digital image correlation (DIC). Based on a methodological approach, the test setups and the test systems used are explained, and the functionality of the concepts is proven by experimental tests using different sheet metal materials.</jats:p>}},
  author       = {{Böhnke, Max and Rossel, Moritz Sebastian and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}},
  issn         = {{0268-3768}},
  journal      = {{The International Journal of Advanced Manufacturing Technology}},
  title        = {{{Concept development of a method for identifying friction coefficients for the numerical simulation of clinching processes}}},
  doi          = {{10.1007/s00170-021-07986-4}},
  year         = {{2021}},
}

@inproceedings{24006,
  author       = {{Weiß, Deborah and Schramm, Britta and Neuser, Moritz and Grydin, Olexandr and Kullmer, Gunter}},
  location     = {{Bremen}},
  pages        = {{231--240}},
  title        = {{{Experimentelle bruchmechanische Untersuchung eines clinchgeeigneten Bleches aus HCT590X mithilfe einer neuen Probengeometrie}}},
  doi          = {{10.48447/BR-2021-025}},
  volume       = {{DVM-Bericht 253}},
  year         = {{2021}},
}

@article{34227,
  abstract     = {{In order to reduce the fuel consumption and consequently the greenhouse emissions, the automotive industry is implementing lightweight constructions in the body in white production. As a result, the use of aluminum alloys is continuously increasing. Due to poor weldability of aluminum in combination with other materials, mechanical joining technologies like clinching are increasingly used. In order to predict relevant characteristics of clinched joints and to ensure the reliability of the process, it is simulated numerically during product development processes. In this regard the predictive accuracy of the simulated process highly depends on the implemented friction model. In particular, the frictional behavior between the sheet metals affects the geometrical formation of the clinched joint significantly. This paper presents a testing method, which enables to determine the frictional coefficients between sheet metal materials for the simulation of clinching processes. For this purpose, the correlation of interface pressure and the relative velocity between aluminum sheets in clinching processes is investigated using numerical simulation. Furthermore, the developed testing method focuses on the specimen geometry as well as the reproduction of the occurring friction conditions between two sheet metal materials in clinching processes. Based on a methodical approach the test setup is explained and the functionality of the method is proven by experimental tests using sheet metal material EN AW6014.}},
  author       = {{Rossel, Moritz Sebastian and Böhnke, Max and Bielak, Christian Roman and Bobbert, Mathias and Meschut, Gerson}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}},
  pages        = {{81--88}},
  publisher    = {{Trans Tech Publications, Ltd.}},
  title        = {{{Development of a Method for the Identification of Friction Coefficients in Sheet Metal Materials for the Numerical Simulation of Clinching Processes}}},
  doi          = {{10.4028/www.scientific.net/kem.883.81}},
  volume       = {{883}},
  year         = {{2021}},
}

@inproceedings{34222,
  abstract     = {{Driven by the CO2-emission law by the European government and the increasing costs for raw materials as well as energy, the automotive industry is increasingly using multi-material constructions. This leads to a continuous increase in the use of mechanical joining techniques and especially the self-piercing riveting is of particular importance. The reason for this is the wide range of joining possibilities as well as the high load-bearing capacities of the joints. To be able to react to changing boundary conditions, like material thickness or strength variation of the sheets, research work is crucial with regard to the increase of versatility. In this paper, a numerical study of the influences on the selfpiercing riveting process is presented. For this purpose, the influence of different process parameters such as rivet length and die depth on various quality-relevant characteristics were investigated. With the help of the design of experiment, significant influences were determined and interactions between the individual parameters are shown.}},
  author       = {{Kappe, Fabian and Bielak, Christian Roman and Sartisson, Vadim and Bobbert, Mathias and Meschut, Gerson}},
  booktitle    = {{ESAFORM 2021}},
  publisher    = {{University of Liege}},
  title        = {{{Influence of rivet length on joint formation on self-piercing riveting process considering further process parameters}}},
  doi          = {{10.25518/esaform21.4277}},
  year         = {{2021}},
}

@article{22798,
  abstract     = {{The predictive quality of numerical simulations for mechanical joining processes depends on the implemented material model, especially regarding the plasticity of the joining parts. Therefore, experimental material characterization processes are conducted to determine the material properties of sheet metal and generate flow curves. In this regard, there are a number of procedures which are accompanied by varying experimental efforts. This paper presents various methods of determining flow curves for HCT590X as well as EN AW-6014, including varying specimen geometries and diverse hardening laws for extrapolation procedures. The flow curves thus generated are compared considering the variety of plastic strains occurring in mechanical joining processes. The material data generated are implemented in simulation models for the joining technologies, clinching and self-piercing riveting. The influence of the varied methods on the predictive accuracy of the simulation model is analysed. The evaluation of the differing flow curves is achieved by comparing the geometric formation of the joints and the required joining forces of the processes with experimentally investigated joints.}},
  author       = {{Böhnke, Max and Kappe, Fabian and Bobbert, Mathias and Meschut, Gerson}},
  issn         = {{2195-8572}},
  journal      = {{Materials Testing}},
  number       = {{6}},
  pages        = {{493--500}},
  publisher    = {{De Gruyter}},
  title        = {{{Influence of various procedures for the determination of flow curves on the predictive accuracy of numerical simulations for mechanical joining processes}}},
  doi          = {{10.1515/mt-2020-0082}},
  volume       = {{63}},
  year         = {{2021}},
}

@article{51199,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Recent developments in automotive and aircraft industry towards a multi-material design pose challenges for modern joining technologies due to different mechanical properties and material compositions of various materials such as composites and metals. Therefore, mechanical joining technologies like clinching are in the focus of current research activities. For multi-material joints of metals and thermoplastic composites thermally assisted clinching processes with advanced tool concepts are well developed. The material-specific properties of fibre-reinforced thermoplastics have a significant influence on the joining process and the resulting material structure in the joining zone. For this reason, it is important to investigate these influences in detail and to understand the phenomena occurring during the joining process. Additionally, this provides the basis for a validation of a numerical simulation of such joining processes. In this paper, the material structure in a joint resulting from a thermally assisted clinching process is investigated. The joining partners are an aluminium sheet and a thermoplastic composite (organo sheet). Using computed tomography enables a three-dimensional investigation that allows a detailed analysis of the phenomena in different joining stages and in the material structure of the finished joint. Consequently, this study provides a more detailed understanding of the material behavior of thermoplastic composites during thermally assisted clinching.</jats:p>}},
  author       = {{Gröger, Benjamin and Köhler, Daniel and Vorderbrüggen, Julian and Troschitz, Juliane and Kupfer, Robert and Meschut, Gerson and Gude, Maik}},
  issn         = {{0944-6524}},
  journal      = {{Production Engineering}},
  keywords     = {{Industrial and Manufacturing Engineering, Mechanical Engineering}},
  number       = {{2-3}},
  pages        = {{203--212}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Computed tomography investigation of the material structure in clinch joints in aluminium fibre-reinforced thermoplastic sheets}}},
  doi          = {{10.1007/s11740-021-01091-x}},
  volume       = {{16}},
  year         = {{2021}},
}

@article{20678,
  author       = {{Bielak, Christian Roman and Böhnke, Max and Beck, Robert and Bobbert, Mathias and Meschut, Gerson}},
  journal      = {{Journal of Advanced Joining Processes. }},
  keywords     = {{Clinching, process simulation, FEM, pre-straining, sensitivity analysis}},
  publisher    = {{Elsevier}},
  title        = {{{Numerical analysis of the robustness of clinching process considering the pre-forming of the parts }}},
  doi          = {{https://doi.org/10.1016/j.jajp.2020.100038}},
  year         = {{2020}},
}

@article{30704,
  author       = {{Böhm, H. and Zhang, H. and Gröger, B. and Hornig, A. and Gude, M.}},
  journal      = {{Journal of Composites Science}},
  pages        = {{188}},
  title        = {{{Characterization and Numerical Modelling of Through-Thickness Metallic-Pin-Reinforced Fibre/Thermoplastic Composites under Bending Loading}}},
  doi          = {{10.3390/jcs4040188}},
  volume       = {{4}},
  year         = {{2020}},
}

@inbook{24575,
  author       = {{Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}},
  booktitle    = {{Light Metals 2020}},
  issn         = {{2367-1181}},
  pages        = {{1039--1044}},
  title        = {{{Influence of Nozzle Shape on Near-Surface Segregation Formation During Twin-Roll Casting of Aluminum Strips}}},
  doi          = {{10.1007/978-3-030-36408-3_141}},
  year         = {{2020}},
}

@article{30712,
  author       = {{Köhler, D. and Gröger, B. and Kupfer, R. and Hornig, A. and Gude, M.}},
  journal      = {{Procedia Manufacturing}},
  pages        = {{940--947}},
  title        = {{{Experimental and Numerical Studies on the Deformation of a Flexible Wire in an Injection Moulding Process}}},
  doi          = {{10.1016/j.promfg.2020.04.288}},
  volume       = {{47}},
  year         = {{2020}},
}

@inproceedings{20344,
  author       = {{Bielak, Christian Roman and Böhnke, Max and Bobbert, Mathias and Meschut, Gerson}},
  location     = {{Darmstadt}},
  title        = {{{Development of a numerical method for analyzing the robustness of clinching in versatile process chains}}},
  year         = {{2020}},
}