@inproceedings{61149,
  abstract     = {{The use of continuous fiber-reinforced thermoplastics (FRTP) in automotive industry increases due to their excellent material properties and possibility of rapid processing. The scale spanning heterogeneity of their material structure and its influence on the material behavior, however, presents significant challenges for most joining technologies, such as self-piercing riveting (SPR). During mechanical joining, the material structure is significantly altered within and around the joining zone, heavily influencing the material behavior. A comprehensive understanding of the underlying phenomena of material alteration during the SPR process is essential as basis for validating numerical simulations. This study examines the material structure at ten stages of a step-setting test of SPR with two FRTP sheets with glass-fiber reinforcement. Utilizing X-ray computed tomography (CT), the damage phenomena within different areas of the setting test are analyzed three-dimensionally and key parameters are quantified. Dominating phenomena during the penetration of the rivet into the laminate are fiber failure (FF), interfiber failure (IFF) and fiber bending, while delamination, fiber kinking and roving splitting are also observed. At the final stages, the bottom layers of the second sheet collapse and form a bulge into the cavity of the die.}},
  author       = {{Dargel, Alrik and Gröger, Benjamin and Schlichter, Malte Christian and Gerritzen, Johannes and Köhler, Daniel and Meschut, Gerson and Gude, Maik and Kupfer, Robert}},
  booktitle    = {{Proceedings of the 8th International Conference on Integrity-Reliability-Failure (IRF2025)}},
  editor       = {{Gomes, J.F. Silva and Meguid, Shaker A.}},
  isbn         = {{9789727523238}},
  keywords     = {{self-piercing riveting, computed tomography, thermoplastic composites, process-structure-interaction}},
  location     = {{Porto}},
  publisher    = {{FEUP}},
  title        = {{{LOCAL DEFORMATION AND FAILURE OF COMPOSITES DURING SELF-PIERCING RIVETING: A CT BASED MICROSTRUCTURE INVESTIGATION}}},
  doi          = {{10.24840/978-972-752-323-8}},
  year         = {{2025}},
}

@article{53621,
  abstract     = {{<jats:p>The coupling of structural transitions to heat capacity changes leads to destabilization of macromolecules at both, elevated and lowered temperatures. DNA origami not only exhibit this property but also provide...</jats:p>}},
  author       = {{Dornbusch, Daniel and Hanke, Marcel and Tomm, Emilia and Kielar, Charlotte and Grundmeier, Guido and Keller, Adrian and Fahmy, Karim}},
  issn         = {{1359-7345}},
  journal      = {{Chemical Communications}},
  keywords     = {{Materials Chemistry, Metals and Alloys, Surfaces, Coatings and Films, General Chemistry, Ceramics and Composites, Electronic, Optical and Magnetic Materials, Catalysis}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Cold denaturation of DNA origami nanostructures}}},
  doi          = {{10.1039/d3cc05985e}},
  year         = {{2024}},
}

@inproceedings{62078,
  abstract     = {{Fiber reinforced plastics (FRP) exhibit strongly non-linear deformation behavior. To capture this in simulations, intricate models with a variety of parameters are typically used. The identification of values for such parameters is highly challenging and requires in depth understanding of the model itself. Machine learning (ML) is a promising approach for alleviating this challenge by directly predicting parameters based on experimental results. So far, this works mostly for purely artificial data. In this work, two approaches to generalize to experimental data are investigated: a sequential approach, leveraging understanding of the constitutive model and a direct, purely data driven approach. This is exemplary carried out for a highly non-linear strain rate dependent constitutive model for the shear behavior of FRP.The sequential model is found to work better on both artificial and experimental data. It is capable of extracting well suited parameters from the artificial data under realistic conditions. For the experimental data, the model performance depends on the composition of the experimental curves, varying between excellently suiting and reasonable predictions. Taking the expert knowledge into account for ML-model training led to far better results than the purely data driven approach. Robustifying the model predictions on experimental data promises further improvement. }},
  author       = {{Gerritzen, Johannes and Hornig, Andreas and Winkler, Peter and Gude, Maik}},
  booktitle    = {{ECCM21 - Proceedings of the 21st European Conference on Composite Materials}},
  isbn         = {{978-2-912985-01-9}},
  keywords     = {{Direct parameter identification, Machine learning, Convolutional neural networks, Strain rate dependency, Fiber reinforced plastics, woven composites, segmentation, synthetic training data, x-ray computed tomography}},
  pages        = {{1252–1259}},
  publisher    = {{European Society for Composite Materials (ESCM)}},
  title        = {{{Direct parameter identification for highly nonlinear strain rate dependent constitutive models using machine learning}}},
  doi          = {{10.60691/yj56-np80}},
  volume       = {{3}},
  year         = {{2024}},
}

@phdthesis{50449,
  abstract     = {{The importance of fiber-reinforced plastics for lightweight construction applications is steadily increasing due to their outstanding weight-specific property values. However, a decisive disadvantage of these composite materials has so far been the high material and process costs, which is why fiber-reinforced plastics are almost exclusively used in small to medium-sized series. Optimization of manufacturing methods is of great importance to reduce the production cost. In this study, two concepts are proposed that can optimize vacuum assisted light resin transfer molding (VA-LRTM) further, leading to a possibility of fully automatic process. Conventional VA-LRTM methods are used to produce complex fiber-reinforced plastics (FRP) and hybrid components. Traditional molds used to produce components via VA-LRTM are sealed using polymer materials to prevent the leakage of matrix system. The seals undergo tremendous amounts of thermal, chemical, and mechanical loadings. Thus, sealings must be replaced in short intervals. In the current study, a concept where sealing is achieved by accelerating the curing of matrix system itself with the help of heating elements and catalysts resulting in a self-sealing approach is proposed. Another concern is mold surface contamination during component production. To address this, a modified automatic cleaning technique based on ultrasonic cleaning was proposed which can be integrated into the production line with minimum modification. Both the proposed concepts were validated and optimized using experiments, simulations, and analytical approaches by producing metal-FRP hybrid shafts.}},
  author       = {{Chalicheemalapalli Jayasankar, Deviprasad}},
  keywords     = {{fiber-reinforced plastics, resin transfer molding, composites}},
  title        = {{{Advances In RTM Manufacturing Of Metal-FRP Hybrids By Self-Sealing And In-Mold Cleaning Techniques}}},
  year         = {{2023}},
}

@inproceedings{51218,
  abstract     = {{Polymer composites represent the industry standard in injection molding for the production of plastic components with increased requirements in terms of heat resistance and stiffness. In the field of laser sintering (LS), these materials are less common so far. In order to extend the available material variety for the LS process, new ceramic-filled Polyamide 613 powders are investigated within the scope of this work. Here, the resulting properties from two different powder production methods are compared. One filled powder is produced by dry blending and the other powder with the same filler and filling ratio is produced by encapsulating the filler particles inside the polymer particles within the dissolution-precipitation process. It was found that encapsulating the filler particles can provide certain benefits for the processability, for example an improved powder flowability or better filler dispersion. However, encapsulating the filler also alters the thermal properties of the precipitated powder. }},
  author       = {{Kletetzka, Ivo and Neitzel, Fabian and Schmid, Hans-Joachim}},
  booktitle    = {{Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium}},
  editor       = {{Beaman, Joseph}},
  keywords     = {{Additive Manufacturing, Laser Sintering, Filled Materials, Composites, Polyamide 613}},
  location     = {{Austin}},
  title        = {{{Assessing the Impact of the Powder Production Method on Ceramic-filled Polyamide Composites made by Laser Sintering}}},
  doi          = {{https://doi.org/10.26153/tsw/50931}},
  year         = {{2023}},
}

@article{43095,
  author       = {{Lenz, Peter and Mahnken, Rolf}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  keywords     = {{Civil and Structural Engineering, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Non-local integral-type damage combined to mean-field homogenization methods for composites and its parallel implementation}}},
  doi          = {{10.1016/j.compstruct.2023.116911}},
  year         = {{2023}},
}

@article{44078,
  author       = {{Andreiev, Anatolii and Hoyer, Kay-Peter and Hengsbach, Florian and Haase, Michael and Tasche, Lennart and Duschik, Kristina and Schaper, Mirko}},
  issn         = {{0924-0136}},
  journal      = {{Journal of Materials Processing Technology}},
  keywords     = {{Industrial and Manufacturing Engineering, Metals and Alloys, Computer Science Applications, Modeling and Simulation, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Powder bed fusion of soft-magnetic iron-based alloys with high silicon content}}},
  doi          = {{10.1016/j.jmatprotec.2023.117991}},
  volume       = {{317}},
  year         = {{2023}},
}

@article{30922,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Pure iron is very attractive as a biodegradable implant material due to its high biocompatibility. In combination with additive manufacturing, which facilitates great flexibility of the implant design, it is possible to selectively adjust the microstructure of the material in the process, thereby control the corrosion and fatigue behavior. In the present study, conventional hot-rolled (HR) pure iron is compared to pure iron manufactured by electron beam melting (EBM). The microstructure, the corrosion behavior and the fatigue properties were studied comprehensively. The investigated sample conditions showed significant differences in the microstructures that led to changes in corrosion and fatigue properties. The EBM iron showed significantly lower fatigue strength compared to the HR iron. These different fatigue responses were observed under purely mechanical loading as well as with superimposed corrosion influence and are summarized in a model that describes the underlying failure mechanisms.</jats:p>}},
  author       = {{Wackenrohr, Steffen and Torrent, Christof Johannes Jaime and Herbst, Sebastian and Nürnberger, Florian and Krooss, Philipp and Ebbert, Christoph and Voigt, Markus and Grundmeier, Guido and Niendorf, Thomas and Maier, Hans Jürgen}},
  issn         = {{2397-2106}},
  journal      = {{npj Materials Degradation}},
  keywords     = {{Materials Chemistry, Materials Science (miscellaneous), Chemistry (miscellaneous), Ceramics and Composites}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Corrosion fatigue behavior of electron beam melted iron in simulated body fluid}}},
  doi          = {{10.1038/s41529-022-00226-4}},
  volume       = {{6}},
  year         = {{2022}},
}

@article{30911,
  author       = {{Vorderbrüggen, Julian and Köhler, Daniel and Grüber, Bernd and Troschitz, Juliane and Gude, Maik and Meschut, Gerson}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  keywords     = {{Civil and Structural Engineering, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Development of a rivet geometry for solid self-piercing riveting of thermally loaded CFRP-metal joints in automotive construction}}},
  doi          = {{10.1016/j.compstruct.2022.115583}},
  volume       = {{291}},
  year         = {{2022}},
}

@article{32330,
  author       = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Hengsbach, Florian and Schaper, Mirko}},
  issn         = {{2238-7854}},
  journal      = {{Journal of Materials Research and Technology}},
  keywords     = {{Metals and Alloys, Surfaces, Coatings and Films, Biomaterials, Ceramics and Composites}},
  pages        = {{2369--2387}},
  publisher    = {{Elsevier BV}},
  title        = {{{Formation of insoluble silver-phases in an iron-manganese matrix for bioresorbable implants using varying laser beam melting strategies}}},
  doi          = {{10.1016/j.jmrt.2022.06.006}},
  volume       = {{19}},
  year         = {{2022}},
}

@article{34256,
  abstract     = {{<jats:p>The 3D shear deformation and failure behaviour of a glass fibre reinforced polypropylene in a shear strain rate range of γ˙=2.2×10−4 to 3.4 1s is investigated. An Iosipescu testing setup on a servo-hydraulic high speed testing unit is used to experimentally characterise the in-plane and out-of-plane behaviour utilising three specimen configurations (12-, 13- and 31-direction). The experimental procedure as well as the testing results are presented and discussed. The measured shear stress–shear strain relations indicate a highly nonlinear behaviour and a distinct rate dependency. Two methods are investigated to derive according material characteristics: a classical engineering approach based on moduli and strengths and a data driven approach based on the curve progression. In all cases a Johnson–Cook based formulation is used to describe rate dependency. The analysis methodologies as well as the derived model parameters are described and discussed in detail. It is shown that a phenomenologically enhanced regression can be used to obtain material characteristics for a generalising constitutive model based on the data driven approach.</jats:p>}},
  author       = {{Gerritzen, Johannes and Hornig, Andreas and Gröger, Benjamin and Gude, Maik}},
  issn         = {{2504-477X}},
  journal      = {{Journal of Composites Science}},
  keywords     = {{Engineering (miscellaneous), Ceramics and Composites}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  title        = {{{A Data Driven Modelling Approach for the Strain Rate Dependent 3D Shear Deformation and Failure of Thermoplastic Fibre Reinforced Composites: Experimental Characterisation and Deriving Modelling Parameters}}},
  doi          = {{10.3390/jcs6100318}},
  volume       = {{6}},
  year         = {{2022}},
}

@article{33671,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>We demonstrate the fabrication of micron-wide tungsten silicide superconducting nanowire single-photon detectors on a silicon substrate using laser lithography. We show saturated internal detection efficiencies with wire widths ranging from 0.59 <jats:italic>µ</jats:italic>m to 1.43 <jats:italic>µ</jats:italic>m under illumination at 1550 nm. We demonstrate both straight wires, as well as meandered structures. Single-photon sensitivity is shown in devices up to 4 mm in length. Laser-lithographically written devices allow for fast and easy structuring of large areas while maintaining a saturated internal efficiency for wire widths around 1 <jats:italic>µ</jats:italic>m.</jats:p>}},
  author       = {{Protte, Maximilian and Verma, Varun B and Höpker, Jan Philipp and Mirin, Richard P and Woo Nam, Sae and Bartley, Tim}},
  issn         = {{0953-2048}},
  journal      = {{Superconductor Science and Technology}},
  keywords     = {{Materials Chemistry, Electrical and Electronic Engineering, Metals and Alloys, Condensed Matter Physics, Ceramics and Composites}},
  number       = {{5}},
  publisher    = {{IOP Publishing}},
  title        = {{{Laser-lithographically written micron-wide superconducting nanowire single-photon detectors}}},
  doi          = {{10.1088/1361-6668/ac5338}},
  volume       = {{35}},
  year         = {{2022}},
}

@article{31185,
  author       = {{Ju, Xiaozhe and Mahnken, Rolf and Xu, Yangjian and Liang, Lihua and Cheng, Chun and Zhou, Wangmin}},
  issn         = {{0263-8223}},
  journal      = {{Composite Structures}},
  keywords     = {{Civil and Structural Engineering, Ceramics and Composites}},
  publisher    = {{Elsevier BV}},
  title        = {{{Multiscale analysis of composite structures with goal-oriented mesh adaptivity and reduced order homogenization}}},
  doi          = {{10.1016/j.compstruct.2022.115699}},
  year         = {{2022}},
}

@article{40564,
  abstract     = {{<jats:p>The reported N-doped noble carbonaceous support provides strong stabilization of Mn(<jats:sc>ii</jats:sc>) sub-nanometric active sites as well as a convenient coordination environment to produce CO, HCOOH and CH<jats:sub>3</jats:sub>COOH from electrochemical CO<jats:sub>2</jats:sub> reduction.</jats:p>}},
  author       = {{Kossmann, Janina and Sánchez-Manjavacas, Maria Luz Ortiz and Brandt, Jessica and Heil, Tobias and Lopez Salas, Nieves and Albero, Josep}},
  issn         = {{1359-7345}},
  journal      = {{Chemical Communications}},
  keywords     = {{Materials Chemistry, Metals and Alloys, Surfaces, Coatings and Films, General Chemistry, Ceramics and Composites, Electronic, Optical and Magnetic Materials, Catalysis}},
  number       = {{31}},
  pages        = {{4841--4844}},
  publisher    = {{Royal Society of Chemistry (RSC)}},
  title        = {{{Mn(<scp>ii</scp>) sub-nanometric site stabilization in noble, N-doped carbonaceous materials for electrochemical CO<sub>2</sub> reduction}}},
  doi          = {{10.1039/d2cc00585a}},
  volume       = {{58}},
  year         = {{2022}},
}

@article{33856,
  abstract     = {{<jats:p>Wood–plastic composites (WPC) are enjoying a steady increase in popularity. In addition to the extrusion of decking boards, the material is also used increasingly in injection molding. Depending on the formulation, geometry and process parameters, WPC tends to exhibit irregular filling behavior, similar to the processing of thermosets. In this work, the influence of matrix material and wood fiber content on the flow, mold filling and segregation behavior of WPC is analyzed. For this purpose, investigations were carried out on a flow spiral and a sheet cavity. WPC based on thermoplastic polyurethane (TPU) achieves significantly higher flow path lengths at a wood mass content of 30% than polypropylene (PP)-based WPC. The opposite behavior occurs at higher wood contents due to the different shear thinning behavior. Slightly decreased wood contents could be observed at the beginning of the flow path and greatly increased wood contents at the end of the flow path, compared to the starting material. When using the plate cavity, flow anomalies in the form of free jets occur as a function of the wood content, with TPU exhibiting the more critical behavior. The flow front is frayed, but in contrast to the flow spiral, no significant wood accumulation could be detected due to the shorter flow path lengths.</jats:p>}},
  author       = {{Moritzer, Elmar and Flachmann, Felix and Richters, Maximilian and Neugebauer, Marcel}},
  issn         = {{2504-477X}},
  journal      = {{Journal of Composites Science}},
  keywords     = {{Engineering (miscellaneous), Ceramics and Composites}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  title        = {{{Analysis of the Segregation Phenomena of Wood Fiber Reinforced Plastics}}},
  doi          = {{10.3390/jcs6100321}},
  volume       = {{6}},
  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{32332,
  author       = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Hengsbach, Florian and Schaper, Mirko}},
  issn         = {{2238-7854}},
  journal      = {{Journal of Materials Research and Technology}},
  keywords     = {{Metals and Alloys, Surfaces, Coatings and Films, Biomaterials, Ceramics and Composites}},
  pages        = {{2369--2387}},
  publisher    = {{Elsevier BV}},
  title        = {{{Formation of insoluble silver-phases in an iron-manganese matrix for bioresorbable implants using varying laser beam melting strategies}}},
  doi          = {{10.1016/j.jmrt.2022.06.006}},
  volume       = {{19}},
  year         = {{2022}},
}

@article{41498,
  author       = {{Krüger, Jan Tobias and Hoyer, Kay-Peter and Hengsbach, Florian and Schaper, Mirko}},
  issn         = {{2238-7854}},
  journal      = {{Journal of Materials Research and Technology}},
  keywords     = {{Metals and Alloys, Surfaces, Coatings and Films, Biomaterials, Ceramics and Composites}},
  pages        = {{2369--2387}},
  publisher    = {{Elsevier BV}},
  title        = {{{Formation of insoluble silver-phases in an iron-manganese matrix for bioresorbable implants using varying laser beam melting strategies}}},
  doi          = {{10.1016/j.jmrt.2022.06.006}},
  volume       = {{19}},
  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}},
}