@inbook{48642,
  author       = {{Akbulut Irmak, Emine Fulya and Hanses, Hendrik and Horwath, Ilona and Tröster, Thomas}},
  booktitle    = {{Climate Protection, Resource Efficiency, and Sustainable Engineering}},
  editor       = {{Horwath, Ilona and Schweizer, Swetlana}},
  isbn         = {{9783837663778}},
  issn         = {{2703-1543}},
  publisher    = {{transcript Verlag}},
  title        = {{{Case Study III: Challenges of lightweight design, vehicles, and rescuers}}},
  doi          = {{10.14361/9783839463772-006}},
  year         = {{2023}},
}

@article{47536,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Efforts to enhance sustainability in all areas of life are increasing worldwide. In the field of manufacturing technology, a wide variety of approaches are being used to improve both resource and energy efficiency. Efficiency as well as sustainability can be improved by creating a circular economy or through energy-efficient recycling processes. As part of the interdisciplinary research group "Light—Efficient—Mobile" investigations on the energy-efficient friction-induced recycling process have been carried out at the department of Forming and Machining Technology at Paderborn University. E.g. using the friction-induced recycling process, different formless solid aluminum materials can be direct recycled into semi-finished products in an energy-efficient manner. The results of investigations with regard to the influence of the geometrical shape and filling rate of the aluminum particles to be recycled as well as the rotational speed of the continuously rotating wheel are explained in this paper. In addition to the recycling of aluminum chips, aluminum particles like powders from the field of additive manufacturing are processed. Based on these results, the future potentials of solid-state recycling processes and their contribution to the circular economy are discussed. The main focus here is on future interdisciplinary research projects to achieve circularity in the manufacturing of user-individual semi-finished products as well as the possibility to selectively adjust the product properties with the continuous recycling process.</jats:p>}},
  author       = {{Borgert, Thomas and Milaege, Dennis and Schweizer, Swetlana and Homberg, Werner and Schaper, Mirko and Tröster, Thomas}},
  issn         = {{1960-6206}},
  journal      = {{International Journal of Material Forming}},
  keywords     = {{General Materials Science}},
  number       = {{6}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Potentials of a friction-induced recycling process to improve resource and energy efficiency in manufacturing technology}}},
  doi          = {{10.1007/s12289-023-01785-w}},
  volume       = {{16}},
  year         = {{2023}},
}

@article{46486,
  author       = {{Pfeifer, Florian and Knorr, Lukas and Schlosser, Florian and Marten, Thorsten and Tröster, Thomas}},
  issn         = {{1848-9257}},
  journal      = {{Journal of Sustainable Development of Energy, Water and Environment Systems}},
  keywords     = {{Energy Engineering and Power Technology, Water Science and Technology, Environmental Science (miscellaneous), Renewable Energy, Sustainability and the Environment}},
  number       = {{3}},
  pages        = {{1--20}},
  publisher    = {{SDEWES Centre}},
  title        = {{{Ecological and Economic Feasibility of Inductive Heating for Sustainable Press Hardening Processes}}},
  doi          = {{10.13044/j.sdewes.d11.0450}},
  volume       = {{11}},
  year         = {{2023}},
}

@inbook{34165,
  author       = {{Hanses, Hendrik and Akbulut Irmak, Emine Fulya and Horwath, Ilona and Tröster, Thomas}},
  booktitle    = {{ Climate Protection, Resource Efficiency, and Sustainable Engineering. Transdisciplinary Approaches to Design and Manufacturing Technology}},
  editor       = {{Horwath, Ilona and Schweizer, Swetlana}},
  isbn         = {{978-3-8376-6377-8}},
  publisher    = {{transcript Verlag}},
  title        = {{{Challenges of lightweight design, vehicles, and rescuers}}},
  year         = {{2023}},
}

@inproceedings{60905,
  author       = {{Ostermann, Moritz and Dierkes, Eric and Marten, Thorsten and Tröster, Thomas}},
  booktitle    = {{Proceedings of the 18th Conference on Sustainable Development of Energy, Water and Environmental Systems, Dubrovnik, Croatia 2023}},
  location     = {{Dubrovnik, Croatia}},
  title        = {{{Life Cycle Assessment of Lightweight Structures in Vehicles for New Mobility Concepts}}},
  year         = {{2023}},
}

@inproceedings{50742,
  abstract     = {{The nickel-based alloy Inconel 718, which is used in aerospace technology, poses a great
challenge to conventional machining due to its high strain hardening and toughness. Here, the laser
powder bed fusion process (LPBF) offers an alternative with potential savings if sufficiently high
productivity can be achieved. Based on the parameter study carried out, starting from the SLM
Solutions standard parameters for the manufacturing of components, exposure parameters could be
developed to realize manufacturing with 120 μm and 150 μm layer thickness, with almost the same
geometric accuracy. For this purpose, the process parameters of laser power, focus diameter, hatch
distance and scan speed were varied. The negative defocusing of the laser showed a positive effect
on the density of the parts, realizing densities ≥ 99.94 %, with high dimensional stability and good
mechanical properties. Considering the reduced manufacturing time of up to 61 %, a significant
increase in productivity was achieved.}},
  author       = {{Bödger, Christian and Gnaase, Stefan and Lehnert, Dennis and Tröster, Thomas}},
  booktitle    = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium – An Additive Manufacturing Conference}},
  location     = {{Austin}},
  title        = {{{Investigation of the influence of process parameters on productivity in the LPBF process for the material Inconel 718}}},
  year         = {{2023}},
}

@article{37200,
  abstract     = {{<jats:p>(1) This work answers the question of whether and to what extent there is a significant difference in mechanical properties when different additive manufacturing processes are applied to the material 1.2709. The Laser-Powder-Bed-Fusion (L-PBF) and Laser-Metal-Deposition (LMD) processes are considered, as they differ fundamentally in the way a part is manufactured. (2) Known process parameters for low-porosity parts were used to fabricate tensile strength specimens. Half of the specimens were heat-treated, and all specimens were tested for mechanical properties in a quasi-static tensile test. In addition, the material hardness was determined. (3) It was found that, firstly, heat treatment resulted in a sharp increase in mechanical properties such as hardness, elastic modulus, yield strength and ultimate strength. In addition to the increase in these properties, the elongation at break also decreases significantly after heat treatment. The choice of process, on the other hand, does not give either process a clear advantage in terms of mechanical properties but shows that it is necessary to consider the essential mechanical properties for a desired application.</jats:p>}},
  author       = {{Gnaase, Stefan and Niggemeyer, Dennis and Lehnert, Dennis and Bödger, Christian and Tröster, Thomas}},
  issn         = {{2073-4352}},
  journal      = {{Crystals}},
  keywords     = {{Inorganic Chemistry, Condensed Matter Physics, General Materials Science, General Chemical Engineering}},
  number       = {{2}},
  publisher    = {{MDPI AG}},
  title        = {{{Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD &amp; L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709}}},
  doi          = {{10.3390/cryst13020157}},
  volume       = {{13}},
  year         = {{2023}},
}

@misc{33001,
  author       = {{Linnig, Caterina and Tröster, Thomas}},
  booktitle    = {{CU reports}},
  title        = {{{Sauber recyceln- Innovative Verfahrenskombination mit Ultraschall ermöglicht sicheren Umgang mit recycelten Carbonfasern}}},
  year         = {{2022}},
}

@inproceedings{37258,
  author       = {{Haller, Sebastian and Tinkloh, Steffen Rainer and Tröster, Thomas and Brandt, Robert}},
  booktitle    = {{5th International Conference Hybrid 2022 Material & Structures}},
  title        = {{{The environmental impact on the strain rate dependent energy absorption capability of a hybrid crash absorber element}}},
  year         = {{2022}},
}

@inproceedings{32819,
  author       = {{Pfeifer, Florian and Tröster, Thomas and Marten, Thorsten and Dietrich, André and Nacke, Bernard and Grundmeier, Guido}},
  booktitle    = {{Proceedings of the 6th International Conference on Steels in Cars and Trucks}},
  location     = {{Mailand}},
  title        = {{{Investigation on hot sheet metal forming by means of a longitudinal flux inductor}}},
  year         = {{2022}},
}

@article{34097,
  author       = {{Voswinkel, Dietrich and Striewe, Jan Andre and Grydin, Olexandr and Meinderink, Dennis and Grundmeier, Guido and Schaper, Mirko and Tröster, Thomas}},
  issn         = {{0924-3046}},
  journal      = {{Advanced Composite Materials}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Ceramics and Composites}},
  pages        = {{1--16}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Co-bonding of carbon fibre-reinforced epoxy and galvanised steel with laser structured interface for automotive applications}}},
  doi          = {{10.1080/09243046.2022.2143746}},
  year         = {{2022}},
}

@article{31496,
  abstract     = {{<jats:p>Carbon fiber reinforced plastics (CFRPs) gained high interest in industrial applications because of their excellent strength and low specific weight. The stacking sequence of the unidirectional plies forming a CFRP laminate, and their thicknesses, primarily determine the mechanical performance. However, during manufacturing, defects, e.g., pores and residual stresses, are induced, both affecting the mechanical properties. The objective of the present work is to accurately measure residual stresses in CFRPs as well as to investigate the effects of stacking sequence, overall laminate thickness, and the presence of pores on the residual stress state. Residual stresses were measured through the incremental hole-drilling method (HDM). Adequate procedures have been applied to evaluate the residual stresses for orthotropic materials, including calculating the calibration coefficients through finite element analysis (FEA) based on stacking sequence, laminate thickness and mechanical properties. Using optical microscopy (OM) and computed tomography (CT), profound insights into the cross-sectional and three-dimensional microstructure, e.g., location and shape of process-induced pores, were obtained. This microstructural information allowed for a comprehensive understanding of the experimentally determined strain and stress results, particularly at the transition zone between the individual plies. The effect of pores on residual stresses was investigated by considering pores to calculate the calibration coefficients at a depth of 0.06 mm to 0.12 mm in the model and utilizing these results for residual stress evaluation. A maximum difference of 46% in stress between defect-free and porous material sample conditions was observed at a hole depth of 0.65 mm. The significance of employing correctly calculated coefficients for the residual stress evaluation is highlighted by mechanical validation tests.</jats:p>}},
  author       = {{Wu, Tao and Kruse, Roland and Tinkloh, Steffen Rainer and Tröster, Thomas and Zinn, Wolfgang and Lauhoff, Christian and Niendorf, Thomas}},
  issn         = {{2504-477X}},
  journal      = {{Journal of Composites Science}},
  keywords     = {{Engineering (miscellaneous), Ceramics and Composites}},
  number       = {{5}},
  publisher    = {{MDPI AG}},
  title        = {{{Experimental Analysis of Residual Stresses in CFRPs through Hole-Drilling Method: The Role of Stacking Sequence, Thickness, and Defects}}},
  doi          = {{10.3390/jcs6050138}},
  volume       = {{6}},
  year         = {{2022}},
}

@article{32814,
  author       = {{Wu, T. and Degener, S. and Tinkloh, Steffen Rainer and Liehr, A. and Zinn, W. and Nobre, J.P. and Tröster, Thomas and Niendorf, T.}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  keywords     = {{Civil and Structural Engineering, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Characterization of residual stresses in fiber metal laminate interfaces - A combined approach applying hole-drilling method and energy-dispersive X-ray diffraction}}},
  doi          = {{10.1016/j.compstruct.2022.116071}},
  year         = {{2022}},
}

@article{29951,
  abstract     = {{The components of a body in white consist of many individual thin-walled sheet metal parts, which usually are manufactured in deep-drawing processes. In general, the conditions in a deep-drawing process change due to changing tribology conditions, varying degrees of spring back, or scattering material properties in the sheet blanks, which affects the resulting pre-strain. Mechanical joining processes, especially clinching, are influenced by these process-related pre-strains. The final geometric shape of a clinched joint is affected to a significant level by the prior material deformation when joining with constant process parameters. That leads to a change in the stiffness and force transmission in the clinched joint due to the different geometric dimensions, such as interlock, neck thickness and bottom thickness, which directly affect the load bearing capacity. Here, the influence of the pre-straining in the deep drawing process on the force distribution in clinch points in an automotive assembly is investigated by finite-element models numerically. In further studies, the results are implemented in an optimization tool for designing clinched components. The methodology starts with a pre-straining of metal sheets. This step is followed by 2D rotationally symmetric forming simulations of the joining process. The resulting mesh of each forming simulation is rotated and 3D models are obtained. The clinched joint solid model with pre-strains is used further to determine the joint stiffnesses. With the simulation of the same test set-up with an equivalent point-connector model, the equivalent stiffness for each pre-strain combination is determined. Simulations are performed on a clinched component to assess the influence of pre-strain and sheet thinning on the clinched joint loadings by using the equivalent stiffnesses. The investigations clearly show that for the selected component, the loadings at the clinch points are dependent on the sheet thinning and the stiffnesses due to pre-strain. The magnitude of the influence varies depending on the quantity considered. For example, the shear force is more sensitive to the joint stiffness than to the sheet thinning.</jats:p>}},
  author       = {{Martin, Sven and Bielak, Christian Roman and Bobbert, Mathias and Tröster, Thomas and Meschut, Gerson}},
  issn         = {{0944-6524}},
  journal      = {{Production Engineering}},
  keywords     = {{Industrial and Manufacturing Engineering, Mechanical Engineering}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Numerical investigation of the clinched joint loadings considering the initial pre-strain in the joining area}}},
  doi          = {{10.1007/s11740-021-01103-w}},
  year         = {{2022}},
}

@article{32813,
  author       = {{Martin, Sven and Kurtusic, Kristijan and Tröster, Thomas}},
  journal      = {{Key Engineering Materials}},
  location     = {{Braga}},
  title        = {{{Influence of the Surrounding Sheet Geometry on a Clinched Joint}}},
  doi          = {{  https://doi.org/10.4028/p-09md1c}},
  volume       = {{927}},
  year         = {{2022}},
}

@article{32869,
  abstract     = {{<jats:p>The further development of in-mold-assembly (IMA) technologies for structural hybrid components is of great importance for increasing the economic efficiency and thus the application potential. This paper presents an innovative IMA process concept for the manufacturing of bending loaded hybrid components consisting of two outer metal belts and an inner core structure made of glass mat reinforced thermoplastic (GMT). In this process, the core structure, which is provided with stiffening ribs and functional elements, is formed and joined to two metal belts in one single step. For experimental validation of the concept, the development of a prototypic molding tool and the manufacturing of hybrid beams including process parameters are described. Three-point bending tests and optical measurement technologies are used to characterize the failure behavior and mechanical properties of the produced hybrid beams. It was found that the innovative IMA process enables the manufacturing of hybrid components with high energy absorption and low weight in one step. The mass-specific energy absorption is increased by 693 % compared to pure GMT beams.</jats:p>}},
  author       = {{Stallmeister, Tim and Tröster, Thomas}},
  issn         = {{1662-9795}},
  journal      = {{Key Engineering Materials}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, General Materials Science}},
  pages        = {{1457--1467}},
  publisher    = {{Trans Tech Publications, Ltd.}},
  title        = {{{In-Mold-Assembly of Hybrid Bending Structures by Compression Molding}}},
  doi          = {{10.4028/p-5fxp53}},
  volume       = {{926}},
  year         = {{2022}},
}

@inproceedings{32871,
  author       = {{Triebus, Marcel and Ostermann, Moritz and Tröster, Thomas and Horwath, Ilona}},
  booktitle    = {{Materials in Car Body Engineering - Bad Nauheim}},
  location     = {{Bad Nauheim}},
  title        = {{{Advanced Automotive Components by Fiber-Metal-Laminates}}},
  year         = {{2022}},
}

@article{30510,
  abstract     = {{The corrosion behavior of a hybrid material consisting of intrinsically bonded carbon fiber-reinforced epoxy resin with laser-structured EN AW 6082 metal was investigated. Particular attention was paid to the effects of the laser-structuring, surface topography and the contacting. Pristine and hybridized specimens were corroded in aqueous NaCl electrolyte (0.1 mol/l) using a potentiodynamic polarization technique and subsequently analyzed using computed tomography, scanning electron-, light- and laser scanning microscopy. The results show that the corrosive reaction arises mainly from the aluminum component. Surface pretreatment of the aluminum resulted in increasing corrosion rates, but showed no influence on the hybrids corrosion properties. Optical micrographs suggest that the epoxy resin acts as a sealant preventing galvanic corrosion between the aluminum and carbon fibers by hindering the diffusion of the electrolyte into the joints. While corrosion effects were observed locally at the aluminum surface, they were, contrary to expectations, not enhanced on the hybrid interfaces.}},
  author       = {{Delp, Alexander and Freund, Jonathan and Wu, Shuang and Scholz, Ronja and Löbbecke, Miriam and Haubrich, Jan and Tröster, Thomas and Walther, Frank}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  keywords     = {{Civil and Structural Engineering, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Influence of laser-generated surface micro-structuring on the intrinsically bonded hybrid system CFRP-EN AW 6082-T6 on its corrosion properties}}},
  doi          = {{10.1016/j.compstruct.2022.115238}},
  volume       = {{285}},
  year         = {{2022}},
}

@inproceedings{49433,
  author       = {{Kaiser, Maximilian Alexander and Rockicki, Pawel and Höschen, Fabian and Wesendahl, Jan-Niklas and Konrad, Stefan and Meyer, Thomas and Marten, Thorsten and Tröster, Thomas}},
  keywords     = {{Ti-6Al-4V, heat transfer coefficient}},
  location     = {{Orlando}},
  title        = {{{ Heat transfer coefficient investigation for hot die quenching process of Ti-6Al-4V alloy}}},
  year         = {{2022}},
}

@inproceedings{36112,
  author       = {{Pfeifer, Florian and Knorr, Lukas and Schlosser, Florian and Marten, Thorsten and Tröster, Thomas}},
  location     = {{Paphos, Zypern}},
  title        = {{{Ecological and Economical Feasibility of Inductive Heating for Sustainable Press Hardening Processes}}},
  year         = {{2022}},
}