@inproceedings{57899,
  abstract     = {{In Haushaltskältegeräten werden in den letzten Jahren immer häufiger Vakuumisolationspaneele (VIP) eingesetzt. Hiermit ist es unter anderem möglich, dass die Geräte in die Energieeffizienzklassen A bis C klassifiziert werden können. Ein VIP besteht vereinfacht aus einer Schutzfolie, die nahezu gasdicht ist und einem Füllmaterial, welches für die Formstabilität im Vakuum zuständig ist. Aufgrund von technischen Alterungsprozessen kommt es mit der Zeit zu einem Anstieg des Innendrucks im VIP, wodurch die Wärmeleitfähigkeit des VIP steigt. Je nach Füllmaterial erfolgt dieser Alterungsprozess unterschiedlich schnell. Im Extremfall kann so ein neues Haushalts-kältegerät der Energieeffizienzklasse A nach 1 bis 3 Jahren nur noch als Klasse D bis F eingestuft werden.
Innerhalb eines Forschungsprojekts wurden Haushaltskältegeräte mit VIP thermografisch untersucht. Im Rahmen dieser Studienarbeit wurde ein Versuchsaufbau entwickelt, mit dem die zeitliche Veränderung von Wärmebrücken begutachtet werden kann und so Rückschlüsse auf den Effizienzverlust der Geräte möglich sind. Der Funkionsnachweises dieses Versuchsaufbaus wurden an einem Haushaltskältegerät mit künstlich gealterten Vakuumisolationspaneelen durchgeführt. Diese Arbeiten bieten zukünftig die Möglichkeiten Haushaltskältegeräten mit VIP bezüglich ihres Degenerationsverhaltens besser zu beurteilen.
}},
  author       = {{Potthast, Emily and Elsner, Andreas and Paul, Andreas and Kasper, Tina}},
  booktitle    = {{Deutsche Kälte- und Klimatagung 2024 Dresden}},
  keywords     = {{Haushaltskältegeräte, Energieaufnahme, Alterung, Isolierung, Vakuumisolationspaneele}},
  location     = {{Dresden}},
  publisher    = {{Deutscher Kälte‐ und Klimatechnischer Verein e.V.}},
  title        = {{{Thermografische Messungen an Haushaltskältegeräten mit Vakuumisolationspaneele}}},
  year         = {{2025}},
}

@article{58510,
  abstract     = {{<jats:p>Today’s ultrasonic transducers find broad application in diverse technology branches and most often cannot be replaced by other actuators. They are typically based on lead-containing piezoelectric ceramics. These should be replaced for environmental and health issues by lead-free alternatives. Multiple material alternatives are already known, but there is a lack of information about their technological readiness level. To fill this gap, a small series of prestressed longitudinally vibrating transducers was set up with a standard PZT material and two lead-free variants within this study. The entire process for building the transducers is documented: characteristics of individual ring ceramics, burn-in results, and free vibration and characteristics under load are shown. The main result is that the investigated lead-free materials are ready to use within ultrasonic bolted Langevin transducers (BLTs) for medium-power applications, when the geometrical setup of the transducer is adopted. Since lead-free ceramics need higher voltages to achieve the same power level, the driving electronics or the mechanical setup must be altered specifically for each material. Lower self-heating of the lead-free materials might be attractive for heat-sensitive processes.</jats:p>}},
  author       = {{Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}},
  issn         = {{2076-0825}},
  journal      = {{Actuators}},
  number       = {{2}},
  publisher    = {{MDPI AG}},
  title        = {{{Lead-Free Ceramics in Prestressed Ultrasonic Transducers}}},
  doi          = {{10.3390/act14020055}},
  volume       = {{14}},
  year         = {{2025}},
}

@article{59478,
  author       = {{Gräßler, Iris and Rarbach, Sven and Pottebaum, Jens}},
  issn         = {{2942-6170}},
  journal      = {{Industry 4.0 Science}},
  number       = {{2}},
  publisher    = {{GITO mbH Verlag}},
  title        = {{{Data Quality in the Engineering of Circular Products - Decision support for circular value creation through data ecosystems}}},
  doi          = {{10.30844/i4se.25.2.12}},
  volume       = {{2025}},
  year         = {{2025}},
}

@inproceedings{59483,
  abstract     = {{<jats:p>Abstract. The assessment of mechanically joined connections, such as clinched connections, is usually conducted destructively. Applicable non-destructive testing methods like computed tomography are time-consuming and costly, or, like electrical resistance measurement, provide only a limited amount of information. A fast, non-destructive evaluation of the joints condition shall be made possible by using transient dynamic analysis (TDA). It is based on the introduction of sound waves and the evaluation of the response behavior after passing through the structure. This study focuses the application of TDA to clinched shear connections to evaluate the performance of the tactile measuring setup. Twenty-one series were investigated, covering variations in joining task, manufacturing and defect. The evaluation was carried out using machine learning to determine for which series characteristic signals may be detected. It was shown that a classification of the investigated specimens is possible, whereby the classification accuracy depends on the examined variation. Furthermore, the accuracy was evaluated as a function of frequency and results were concluded to identify the limits of the used measuring setup.</jats:p>}},
  author       = {{Reschke, Gregor and Brosius, Alexander}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  keywords     = {{Joining, Machine Learning, Transient Dynamic Analysis}},
  location     = {{Paderborn}},
  pages        = {{293--300}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Transient dynamic analysis: Performance evaluation of tactile measurement}}},
  doi          = {{10.21741/9781644903551-36}},
  volume       = {{52}},
  year         = {{2025}},
}

@inproceedings{59683,
  abstract     = {{Woven fibre-reinforced polymers are used in a variety of application, especially where a low mass to stiffness ratio is required. Of paramount importance for the tailored mechanical properties these composite materials exhibit is the type and geometry of the fibre weave. Especially continuous fibre-reinforced thermoplastic composites are fabricated as laminates and subsequently exposed to forming processes which alter the geometry of the fibres unit cell and thus the local mechanical properties of the material. An approach utilising broadband ultrasonic waves is proposed to non-destructively determine the geometry of the unit cell of the weave.

The dispersive behaviour of woven fibre-reinforced sheets is described in accordance with the Flouquet-Bloch theorem as a phononic crystal. In order to develop a model for a description of these periodically structured waveguides, the smallest repeating unit of the wave is modelled with periodic boundary conditions. The resulting dispersion diagram exhibits similarities to that of a homogeneous plate, but additionally displays a periodicity in the wavenumber regime, which correspond with the size of the unit cell. Experimental studies of the dispersive behaviour of acoustic waves in woven fibre-reinforced samples also show a periodicity in the wavenumber regime, enabling a measurement procedure of the unit cell geometry.}},
  author       = {{Wippermann, Mareen and Claes, Leander and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Determination of the unit cell geometry in fibre-reinforced polymer sheets using guided acoustic waves}}},
  doi          = {{10.71568/DASDAGA2025.116}},
  year         = {{2025}},
}

@inproceedings{59688,
  author       = {{Claes, Leander and Zeipert, Henning and Brandes, Philipp and Moritzer, Elmar and Henning, Bernd}},
  location     = {{Copenhagen}},
  title        = {{{Assessment of Fibre-Matrix Adhesion in Reinforced Polymers by Modal Damping of Guided Acoustic Waves}}},
  doi          = {{10.71568/DASDAGA2025.052}},
  year         = {{2025}},
}

@inproceedings{59876,
  abstract     = {{<jats:p>Abstract. Clinching is a conventional mechanical joining process used in Multi-Material Design in the automotive sector. To receive the desired geometrical characteristics in clinch joints, correct process design is required. To reduce the cost of finding fitting process parameters, numerical simulation of the joining process can be used to predict the geometrical characteristics, such as interlock, instead of an experimental approach. These numerical simulation models consume computational resources and time. In this paper machine learning is used to find correlations between features of the joining process and geometrical characteristics in the joint. This serves the purpose of predicting the joint’s target values more resource-efficiently. Modelling with machine learning requires a structured dataset with sufficient parameter variation. To create this data base the following procedure was used. For joining partners, a HC340LA steel alloy with 2 mm material thickness was used punch-sided and an EN AW 5182 aluminum alloy with 1.5 mm thickness was used die-sided. For this combination a suitable tool combination and punch distance was experimentally identified. A finite element model was created to reproduce the joining process. For the modelling of the material of both joining partners flow curves determined by Vallaster et al. were used [1]. The punch and die were recreated digitally by opto-electronic measurements and transformed into a mesh suitable for numerical simulation. The model was validated by comparing process values like the maximum force applied by the punch and geometrical values in the joints cross section. Additionally, a process window for suitable punch distances was experimentally determined. Afterwards a variation of 70 different process designs was conducted with variants inside and outside the process window. The results were used for training, testing and validating various machine learning models. All models competed against each other to find the must suited model to predict every geometric value. To ensure good model performances and prevent the model from overfitting, a tenfold cross validation was used for validating the models. Analysis of the results gives the following key findings: i) Good predictability is reached for the interlock and sheet thickness of the joint. ii) Prediction neck thickness showed low error values, but also low correlation. iii)The prediction of those key values for evaluating clinch joint characteristics by machine learning models positively impacts needed resources in comparison to numerical models.</jats:p>}},
  author       = {{Ludwig, Jean-Patrick and Tsi-Nda Lontsi, Seraphin  and Neumann, Jonas and Kappis, Lukas and Scharr, Christian  and Flügge, Wilko and Merklein, Marion and Meschut, Gerson}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{Data driven prognosis of clinch joints in multi-material design}}},
  doi          = {{10.21741/9781644903599-157}},
  volume       = {{54}},
  year         = {{2025}},
}

@inbook{59905,
  abstract     = {{Um die international und national beschlossenen Klimaziele zu erreichen, müssen die verkehrsbedingten Emissionen in der Bundesrepublik Deutschland drastisch reduziert werden. Hierzu bedarf es einer umfassenden Mobilitätswende, welche die Etablierung emissionsärmerer und effizienterer Mobilitätsformen umfasst. Ein Lösungsansatz können on-demand Dienste bieten, die den öffentlichen Personennahverkehr bedarfsgerecht gestalten und so dessen Akzeptanz steigern. Zahlreiche bisher eingeführte on-demand Dienste mussten jedoch nach Beendigung des Projekt- bzw. Förderzeitraums wieder eingestellt werden. Maßgebliche Herausforderungen waren die Integration der Dienste in die bestehenden ÖPNV- und Mobilitäts-Strukturen sowie teilweise damit einhergehende ökonomische Aspekte. In diesem Beitrag wird eine Methode vorgestellt, welche neben der Einführung neuartiger Mobilitätsdienste auch die Entwicklung eines nachhaltigen Mobilitäts-Ökosystems anstrebt. Der Fokus liegt dabei auf ländlich geprägten Regionen und ihren besonderen Herausforderungen im Bereich des öffentlichen Nahverkehrs. Die Methode beschreibt ein fünf-phasiges Handlungsschema, in welchem Potenziale bestehender Strukturen genutzt, Mobilitäts-Stakeholder eingebunden und verhärtete Mobilitätsverhalten allmählich positiv verändert werden. Anhand der Initiative Neue Mobilität Paderborn wird aufgezeigt, dass mithilfe der Methode erste Schritte hin zu einem Mobilitäts-Ökosystem absolviert werden können. Darüber hinaus werden Einführungsszenarien für die neuartige, sich noch in der Entwicklung befindliche Mobilitätslösung NeMo.bil in einer Beispielregion erarbeitet.}},
  author       = {{Behm, Jonathan and Ostermann, Moritz and Bomm, Julian and Rahmann, Sören and Tröster, Thomas and Marten, Thorsten}},
  booktitle    = {{New Players in Mobility}},
  isbn         = {{9783658464844}},
  location     = {{Duisburg}},
  publisher    = {{Springer Fachmedien Wiesbaden}},
  title        = {{{Einführungsstrategien nachhaltiger on-demand Mobilitätkonzepte im öffentlichen Nahverkehr}}},
  doi          = {{10.1007/978-3-658-46485-1_36}},
  year         = {{2025}},
}

@article{60040,
  author       = {{Pfeffer, Nina and Jäger, Stefanie Nicole and Kaiser, Maximilian Alexander and Meyer, Thomas and Stark, Andreas and Höppel, Heinz Werner}},
  issn         = {{0921-5093}},
  journal      = {{Materials Science and Engineering: A}},
  publisher    = {{Elsevier BV}},
  title        = {{{Enhancing mechanical strength of Ti-6Al-4V sheet material by short-time sub-β-transus solution heat treatment and additional short-time annealing}}},
  doi          = {{10.1016/j.msea.2025.147787}},
  volume       = {{926}},
  year         = {{2025}},
}

@phdthesis{59908,
  author       = {{Gevers, Karina}},
  isbn         = {{978-3-8440-9978-2 }},
  keywords     = {{Infrarotschweißen, Zeitfestigkeit, Polyamide}},
  pages        = {{216}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Zeitfestigkeit von infrarotgeschweißten gefüllten Polyamiden }}},
  year         = {{2025}},
}

@inproceedings{60108,
  abstract     = {{<jats:p>Abstract. In the field of mechanical engineering, destructive tests such as shear tests of mechanical joints are usually followed by imaging methods such as microsectioning or computed tomography (CT). They can help to interpret the measured load-displacement curves, analyze the failure behavior and validate numerical models. However, due to unloading, springback effects and crack closures can occur, which influence the state of the investigated specimen. In this context, in situ CT is able to explore the testing process with a specimen under load avoiding these influences. For in situ CT investigations, the displacement increase is interrupted at certain stop points. While the displacement is kept constant, the CT scan is performed. However, it was observed that the reaction force reduces during CT scanning, e. g. due to settling effects in the test setup. Although in situ CT is established now in research, little attention is paid to the uncertainties which arise from the discontinuous testing procedure. This study systematically explores the impact of these interruptions on the load-displacement behavior and the geometry of clinch points during tensile shear testing. To quantify the influence of the interruptions, loads at defined displacement levels and the final geometry are evaluated statistically. We found, that the load-displacement behavior of both test groups is similar. Despite some small but significant statistical deviations of the loads and the final geometry, our results show that, discontinuous testing has a high level of significance for the phenomena overserved in shear tests with clinch points.</jats:p>}},
  author       = {{Köhler, D. and Troschitz, J and Kupfer, R. and Gude, M.}},
  booktitle    = {{Materials Research Proceedings}},
  issn         = {{2474-395X}},
  publisher    = {{Materials Research Forum LLC}},
  title        = {{{In situ computed tomography – Analysis of settling effects during single-lap shear tests with clinch points}}},
  doi          = {{10.21741/9781644903551-15}},
  volume       = {{52}},
  year         = {{2025}},
}

@article{60081,
  author       = {{Naumann, Marius and Ostermann, Moritz and Buchenau, Nadja and Oetzel, Jannik and Schlosser, Florian and Meschede, Henning and Tröster, Thomas}},
  issn         = {{0196-8904}},
  journal      = {{Energy Conversion and Management}},
  publisher    = {{Elsevier BV}},
  title        = {{{Energy efficiency improvement for decarbonization in manufacturing industry: A review}}},
  doi          = {{10.1016/j.enconman.2025.119763}},
  volume       = {{338}},
  year         = {{2025}},
}

@inbook{59261,
  author       = {{Magerkohl, Sebastian and Magyar, Balázs}},
  booktitle    = {{Innovative Produktentwicklung durch additive Fertigung}},
  editor       = {{Lachmayer, Roland and Oel, Marcus and Kaierle, Stefan}},
  isbn         = {{9783662693261}},
  publisher    = {{Springer Berlin Heidelberg}},
  title        = {{{The Role or Rule of the Development Methodology for Additive Manufacturing}}},
  doi          = {{10.1007/978-3-662-69327-8}},
  year         = {{2025}},
}

@article{60017,
  author       = {{Skolik, Alexander Marcus and zur Heiden, Philipp and Donner, Johannes Aurelius Tamino and Priefer, Jennifer}},
  journal      = {{ECIS 2025 Proceedings}},
  location     = {{Amman, Jordan}},
  title        = {{{Igniting Knowledge Management for Assistance Systems in Maintenance: A Method for Knowledge Gathering}}},
  volume       = {{2}},
  year         = {{2025}},
}

@inproceedings{63839,
  author       = {{Gilich, Julian and Meschut, Gerson and Gröger, Benjamin and Wiebicke, Felix and Koch, Ilja and Gude, Maik}},
  booktitle    = {{25. Kolloquium: Gemeinsame Forschung in der Klebtechnik}},
  location     = {{Köln}},
  title        = {{{Experimentelle und numerische Analyse des Fließverhaltens von  hochviskosen Wärmeleitstoffen im Fertigungsprozess}}},
  year         = {{2025}},
}

@inbook{60834,
  author       = {{Ott, Manuel and Jung, Philipp and Bödger, Christian and Mozgova, Iryna and Koch, Rainer and Tröster, Thomas}},
  booktitle    = {{Innovative Produktentwicklung durch additive Fertigung}},
  editor       = {{Lachmayer, Roland and Kaierle, Stefan and Oel, Marcus}},
  pages        = {{117--127}},
  title        = {{{Fused Deposition Modeling and its Extension Through Metal-Filled Filaments as a Means of Self-Help for Individuals with Physical Disabilities}}},
  doi          = {{doi.org/10.1007/978-3-662-69327-8}},
  year         = {{2025}},
}

@techreport{64173,
  author       = {{Heitmann, Marcel and Meschut, Gerson}},
  isbn         = {{978-3-96780-210-8}},
  title        = {{{Verfahrenserweiterung des Widerstandselementschweißens für stahlintensive Dreiblech-Hybrid Mischverbindungen mit zwei höchstfesten Stahlgüten in Mittel- und Basislage  }}},
  year         = {{2025}},
}

@inproceedings{63437,
  author       = {{Beckmann, Johanna and Bachmann, Andre and Brandes, Philipp and Marten, Thorsten and Tröster, Thomas and Moritzer, Elmar}},
  booktitle    = {{24th International Conference on Composite Materials (ICCM24)}},
  keywords     = {{Faser-Kunststoff-Verbunde (FKV), Faserverstärkte Kunststoffe (FVK), Organobleche}},
  publisher    = {{The University of Delaware}},
  title        = {{{Validation of Possible Applications of Flake Laminates for Recycling of PA6-CF Production Scrap}}},
  doi          = {{https://doi.org/10.5281/zenodo.18597865}},
  year         = {{2025}},
}

@book{64188,
  author       = {{Meschut, Gerson and Gilich, Julian and Gude, Maik and Koch, Ilja and Gröger, Benjamin and Wiebicke, Felix}},
  publisher    = {{Forschungsvereinigung Automobiltechnik e.V.}},
  title        = {{{Experimentelle und numerische Untersuchung des Fließverhaltens von hochviskosen Wärmeleitstoffen im Fertigungsprozess}}},
  volume       = {{391}},
  year         = {{2025}},
}

@article{58163,
  abstract     = {{Fibre-reinforced polymers are increasingly used due to their high specific strength, making them suitable for local sheet metal reinforcement. This allows improved overall mechanical properties with reduced wall thickness of the sheet metal part and, thus, lower weight of the components. One of the main focuses of research into such hybrid structures is on the adhesive properties and the respective failure behaviour of the interfaces. Generally, the failure behaviour under the influence of mechanical loads can be divided into adhesive, cohesive and mixed-mode failure. The correlation between observed failure behaviour and adhesion properties of the hybrid composite materials is analysed in detail in this work. The hybrid composite consists of an aluminium sheet of the alloy EN AW‑6082 T6 and thermoset carbon fibre-reinforced plastic (CFRP) prepreg. The aluminium sheet was laser pretreated before hybrid production to improve the adhesion properties. The specimens studied were produced by the prepreg pressing process, in which the components are cured and joined simultaneously. The influences of the thickness of the CFRP part, the layup, the fibre orientation at the boundary layer, and the laser pretreatment parameters on the properties of the hybrid joints were investigated.}},
  author       = {{Wu, Shuang and Delp, Alexander and Freund, Jonathan and Walther, Frank and Haubrich, Jan and Löbbecke, Miriam and Tröster, Thomas}},
  issn         = {{0021-8464}},
  journal      = {{The Journal of Adhesion}},
  keywords     = {{Prepreg pressing process, hybrid joints, laser surface pretreatment, intrinsic manufacturing, CFRP, aluminium, materials engineering}},
  pages        = {{1--26}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Correlation between interlaminar shear strength of CFRP and joint strength of aluminium-CFRP hybrid joints}}},
  doi          = {{10.1080/00218464.2024.2439956}},
  year         = {{2025}},
}