@article{34075,
  author       = {{Penner, Eduard and Caylak, Ismail and Mahnken, Rolf}},
  issn         = {{2325-3444}},
  journal      = {{Mathematics and Mechanics of Complex Systems}},
  keywords     = {{Computational Mathematics, Numerical Analysis, Civil and Structural Engineering}},
  number       = {{1}},
  pages        = {{21--50}},
  publisher    = {{Mathematical Sciences Publishers}},
  title        = {{{A polymorphic uncertainty model for the curing process of transversely fiber-reinforced plastics}}},
  doi          = {{10.2140/memocs.2022.10.21}},
  volume       = {{10}},
  year         = {{2022}},
}

@article{33801,
  author       = {{Mahnken, Rolf}},
  issn         = {{0045-7825}},
  journal      = {{Computer Methods in Applied Mechanics and Engineering}},
  keywords     = {{Computer Science Applications, General Physics and Astronomy, Mechanical Engineering, Mechanics of Materials, Computational Mechanics}},
  publisher    = {{Elsevier BV}},
  title        = {{{New low order Runge–Kutta schemes for asymptotically exact global error estimation of embedded methods without order reduction}}},
  doi          = {{10.1016/j.cma.2022.115553}},
  volume       = {{401}},
  year         = {{2022}},
}

@inproceedings{36339,
  abstract     = {{Al-Li-based alloys are an attractive material for aircraft and aerospace applications. Preparation of these alloys by twin-roll casting (TRC), which combines rapid metal solidification and subsequent plastic reduction in a single processing step, could improve the properties of the alloys compared to materials prepared by conventional direct-chill casting. A commonly used approach for identifying primary phases is a chemical analysis by energy dispersive spectroscopy (EDS). More accurate results can be achieved by combining the method with diffraction analysis. This process can be considerably simplified in microscopes equipped with automated crystal orientation and phase mapping (ACOM-TEM). Al-Cu-Li-Mg-Zr alloy was prepared by twin-roll casting. A combination of TEM and STEM images with chemical analysis by EDS and ACOM-TEM was used to obtain complex information about phases of boundary primary particles. The efficiency of the individual methods for the phase identification in TRC Al-Li-based alloys is discussed.}},
  author       = {{BAJTOŠOVÁ, Lucia and Grydin, Olexandr and STOLBCHENKO, Mykhailo and Schaper, Mirko and KŘIVSKÁ, Barbora and KRÁLÍK, Rostislav and ŠLAPÁKOVÁ, Michaela and CIESLAR, Miroslav}},
  booktitle    = {{METAL 2022 Conference Proeedings}},
  issn         = {{2694-9296}},
  keywords     = {{Al-Cu-Li-M-Zr-Fe alloy, twin-roll casting, phase identification, ACOM-TEM}},
  location     = {{Brno}},
  publisher    = {{TANGER Ltd.}},
  title        = {{{Phase identification in twin-roll cast Al-Li alloys}}},
  doi          = {{10.37904/metal.2022.4437}},
  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{36327,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>With an innovative optical characterization method, using high-temperature digital image correlation in combination with thermal imaging, the local change in strain and change in temperature could be determined during thermo-mechanical treatment of flat steel specimens. With data obtained by this optical method, the transformation kinetics for every area of interest along the whole measuring length of a flat specimen could be analyzed by the generation of dilatation curves. The benefit of this innovative optical characterization method compared to a dilatometer test is that the experimental effort for the design of a tailored component could be strongly reduced to the investigation of only a few tailored thermo-mechanical processed specimens. Due to the implementation of a strain and/or temperature gradient within the flat specimen, less metallographic samples are prepared for hardness analysis and analysis of the microstructural composition by scanning electron microscopy to investigate the influence of different process parameters. Compared to performed dilatometer tests in this study, the optical method obtained comparable results for the transformation start and end temperatures. For the final design of a part with tailored properties, the optical method is suitable for a time-efficient material characterization.</jats:p>
                <jats:p><jats:bold>Graphical Abstract</jats:bold></jats:p>}},
  author       = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}},
  issn         = {{1073-5623}},
  journal      = {{Metallurgical and Materials Transactions A}},
  keywords     = {{Metals and Alloys, Mechanics of Materials, Condensed Matter Physics}},
  number       = {{8}},
  pages        = {{3125--3142}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Optical Detection of Phase Transformations in Steels: An Innovative Method for Time-Efficient Material Characterization During Tailored Thermo-mechanical Processing of a Press Hardening Steel}}},
  doi          = {{10.1007/s11661-022-06732-z}},
  volume       = {{53}},
  year         = {{2022}},
}

@article{36328,
  abstract     = {{Aluminium-steel clad composite was manufactured by twin-roll casting. An intermetallic layer of Al5Fe2 and Al13Fe4 formed at the interface upon annealing above 500 °C. During in-situ annealing in transmission electron microscope, the layer grew towards the steel side of the interface in tongue-like protrusions. A study of furnace-annealed samples revealed, that the bulk growth of the interface phase proceeds towards the aluminium side. The growth towards steel is a surface effect that takes place simultaneously with the bulk growth towards aluminium. At the beginning of the intermetallic layer formation diffusion of Fe into aluminium prevails, afterwards Al atoms diffuse throught the newly formed intermetallic layer towards steel and the whole interface shifts towards aluminium. The kinetics of growth of the intermetallic layer follows parabolic law in both cases, indicating that the growth is governed by diffusion.}},
  author       = {{Šlapáková, Michaela and Křivská, Barbora and Fekete, Klaudia and Králík, Rostislav and Grydin, Olexandr and Stolbchenko, Mykhailo and Schaper, Mirko}},
  issn         = {{1044-5803}},
  journal      = {{Materials Characterization}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  publisher    = {{Elsevier BV}},
  title        = {{{The influence of surface on direction of diffusion in Al-Fe clad material}}},
  doi          = {{10.1016/j.matchar.2022.112005}},
  volume       = {{190}},
  year         = {{2022}},
}

@article{23794,
  author       = {{Westermann, Hendrik and Reitz, Alexander and Mahnken, Rolf and Schaper, Mirko and Grydin, Olexandr}},
  issn         = {{1611-3683}},
  journal      = {{steel research international}},
  title        = {{{Microstructure transformations in a press hardening steel during tailored thermo‐mechanical processing}}},
  doi          = {{10.1002/srin.202100346}},
  year         = {{2022}},
}

@article{29811,
  abstract     = {{In order to reduce CO2 emissions in the transport sector, the approach of load-adapted components is increasingly being pursued. For the design of such components, it is crucial to determine their resulting microstructure and mechanical properties. For this purpose, continuous cooling transformation diagrams and deformation continuous cooling transformation diagrams are utilized, however, their curves are strongly influenced by the chemical composition, the initial state and especially the process parameters.

In this study, the influence of the process parameters on the transformation kinetics is systematically investigated using an innovative characterization method. The experimental setup allowed a near-process analysis of the transformation kinetics, resulting microstructure and mechanical properties for a specific process route with a reduced number of specimens. A systematic investigation of the effects of different process parameters on the microstructural and mechanical properties made it possible to reveal interactions and independencies between the process parameters in order to design a partial heating or differential cooling process. Furthermore, the implementation of two different cooling conditions, representative of differential cooling in the die relief method with tool-contact and non-contact areas, showed that the soaking duration has a significant influence on the microstructure in the non-contact tool area.}},
  author       = {{Reitz, Alexander and Grydin, Olexandr and Schaper, Mirko}},
  issn         = {{0921-5093}},
  journal      = {{Materials Science and Engineering: A}},
  keywords     = {{Mechanical Engineering, Mechanics of Materials, Condensed Matter Physics, General Materials Science}},
  publisher    = {{Elsevier BV}},
  title        = {{{Influence of thermomechanical processing on the microstructural and mechanical properties of steel 22MnB5}}},
  doi          = {{10.1016/j.msea.2022.142780}},
  volume       = {{838}},
  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{29948,
  author       = {{Brüning, Florian and Schöppner, Volker}},
  journal      = {{Polymers 14}},
  keywords     = {{Computing Resources Provided by the Paderborn Center for Parallel Computing}},
  title        = {{{Numerical Simulation of Solids Conveying in Grooved Feed Sections of Single Screw Extruders}}},
  doi          = {{https://doi.org/10.3390/polym14020256}},
  year         = {{2022}},
}

@article{34708,
  author       = {{Schöppner, Volker and Gevers, Karina and Tornede, A. and Wever, M. and Hüllermeier, E.}},
  journal      = {{Welding in the World}},
  pages        = {{14}},
  title        = {{{A comparison of heuristic, statistical, and machine learning methods for heated tool butt welding of two different materials}}},
  year         = {{2022}},
}

@article{34739,
  author       = {{Moritzer, Elmar and Held, Christian and Hillemeyer, J.}},
  issn         = {{0043-2288}},
  journal      = {{Welding in the World}},
  title        = {{{Material-specific prediction of the optimal joinig parameters for the screw blind rivet joining process}}},
  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{33803,
  author       = {{Hanses, Hendrik and Horwath, Ilona}},
  booktitle    = {{Conference proceedings 38th Danubia Adria Symposium on Advances in Experimental Mechanics}},
  editor       = {{Kourkoulis, Stavros K.}},
  isbn         = {{978-618-86278-0-2}},
  location     = {{Poros}},
  title        = {{{OPERATIONAL AND DEMAND-ORIENTED FIREFIGHTING EQUIPMENT }}},
  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{30228,
  abstract     = {{Confidence in additive manufacturing technologies is directly related to the predictability of part properties, which is influenced by several factors. To gain confidence, online process monitoring with dedicated and reliable feedback is desirable for every process. In this project, a powder bed monitoring system was developed as a retrofit solution for the EOS P3 laser sintering machines. A high-resolution camera records each layer, which is analyzed by a Region-Based Convolutional Neural Network (Mask R-CNN). Over 2500 images were annotated and classified to train the network in detecting defects in the powder bed at a very high level. Each defect is checked for intersection with exposure areas. To distinguish between acceptable imperfections and critical defects that lead to part rejection, the impact of these imperfections on part properties is investigated.}},
  author       = {{Klippstein, Sven Helge and Heiny, Florian and Pashikanti,, Nagaraju and Gessler, Monika and Schmid, Hans-Joachim}},
  journal      = {{JOM - The Journal of The Minerals, Metals & Materials Society (TMS)}},
  location     = {{Online}},
  pages        = {{1149–1157}},
  publisher    = {{Springer}},
  title        = {{{Powder Spread Process Monitoring in Polymer Laser Sintering and its Influences on Part Properties}}},
  doi          = {{https://doi.org/10.1007/s11837-021-05042-w }},
  volume       = {{74}},
  year         = {{2022}},
}

@inproceedings{33356,
  abstract     = {{By monitoring the recoating process within polymer laser sintering production, it was shown that multiple powder-spread-flaws can be detected. Those groove-like flaws are expected to be the result of agglomerates jamming between the recoater and the last powder layer. This work is analyzing the interaction between powder-spread-flaws and part properties, showing the influence of the recoating process on the performance of laser sintering parts. Therefore, artificial powder-spread-flaws are applied to the build jobs of tensile test specimens which are measured and analyzed regarding the elongation at break, strength and fracture position. For the characteristics of the flaws, the artificial grooves are varied in depth and width. Furthermore, the position of the flaw is changed form mid part to close to surface areas. It was shown, that several flaws are visible at the part surface, resulting in stress concentration and reduced performance. But there are as well parts with flaw-layers, which are not visible after the build process on the part. Those parts can have significantly reduced mechanical properties as well.}},
  author       = {{Klippstein, Sven Helge and Schmid, Hans-Joachim}},
  booktitle    = {{Proceedings of the 33nd Annual International Solid Freeform Fabrication Symposium}},
  keywords     = {{Selective Sasersintering, Process Monitoring, Powder Spread}},
  title        = {{{Powder Spread Flaws in Polymer Laser Sintering and its Influences on Mechanical Performance}}},
  year         = {{2022}},
}