@article{41524,
  author       = {{Engelkemeier, Katja and Lindner, Jörg K N and Bürger, Julius and Vaupel, Kathrin and Hartmann, Marc and Tiemann, Michael and Hoyer, Kay-Peter and Schaper, Mirko}},
  issn         = {{0957-4484}},
  journal      = {{Nanotechnology}},
  keywords     = {{Electrical and Electronic Engineering, Mechanical Engineering, Mechanics of Materials, General Materials Science, General Chemistry, Bioengineering}},
  number       = {{9}},
  publisher    = {{IOP Publishing}},
  title        = {{{Nano-architectural complexity of zinc oxide nanowall hollow microspheres and their structural properties}}},
  doi          = {{10.1088/1361-6528/ab55bc}},
  volume       = {{31}},
  year         = {{2019}},
}

@article{23900,
  author       = {{Grydin, Olexandr and Andreiev, Anatolii and Holzweißig, Martin Joachim and Rüsing, Christian Johannes and Duschik, Kristina and Frolov, Yaroslav and Schaper, Mirko}},
  issn         = {{0921-5093}},
  journal      = {{Materials Science and Engineering: A}},
  pages        = {{176--195}},
  title        = {{{Short austenitization treatment with subsequent press hardening: Correlation between process parameters, microstructure and mechanical properties}}},
  doi          = {{10.1016/j.msea.2019.02.025}},
  year         = {{2019}},
}

@article{23901,
  author       = {{Grydin, Olexandr and Andreiev, Anatolii and Zogaj, Mergim and Frolov, Yaroslav and Schaper, Mirko}},
  issn         = {{1438-1656}},
  journal      = {{Advanced Engineering Materials}},
  title        = {{{Relationships between Microstructural and Mechanical Performance on Example of an Air‐Hardening Steel}}},
  doi          = {{10.1002/adem.201900134}},
  year         = {{2019}},
}

@phdthesis{10001,
  abstract     = {{Durch die Auslegung eines Fahrwerks werden maßgebend die Fahrsicherheit, der Fahrkomfort, die Effizienz und der Fahrspaß eines Kraftfahrzeugs bestimmt. Daher zählt das Fahrwerk zu den wichtigsten und zugleich komplexesten Systemen in einem Automobil. Aufgrund steigender Kundenanforderungen, Auflagen durch Gesetzgebung sowie Termin- und Kostendruck stellt die Entwicklung des Fahrwerks für die heutigen Automobile stets eine Herausforderung dar. Um die gestellten Anforderungen zu erfüllen, sind oftmals gegenläufige Maßnahmen erforderlich, sodass die Auslegung des Fahrwerks in der Regel nur einen Kompromiss bildet. Entwicklungsziele zur Reduktion der Umweltbelastung und zur Effizienzsteigerung gewinnen hierbei zunehmend an Bedeutung. Damit verbunden müssen die Interaktionen zwischen Fahrwerk und Reifen hinreichend genau erfasst werden, sodass folglich eine Erweiterung bisheriger Simulationsmethoden erforderlich ist. In der vorliegenden Arbeit wird eine Vorgehensweise mit dem Schwerpunkt auf der Abbildung der Wechselwirkungen zwischen der Fahrwerkdynamik am Beispiel einer Mehrlenkerhinterachse und des Reifen-Fahrbahn-Rollkontakts entwickelt, die eine modellbasierte Analyse der Reibvorgänge in der Kontaktzone unter realitätsnahen Bedingungen ermöglicht. Vor allem können dadurch die Auswirkungen der Fahrwerkauslegung auf die Leistungsübertragung zwischen Reifen und Fahrbahn und den resultierenden Reifenverschleiß effektiv bewertet und bereits in der frühen Entwicklungsphase berücksichtigt werden.}},
  author       = {{Kohl, Sergej}},
  keywords     = {{Reifenverschleiß, Reibleistung, Reifenlatsch, Reifen-Fahrbahn-Kontakt, Fahrbahnanregung, Mehrlenkerachse, Kinematik, Elastokinematik, Fahrwerkdynamik, Frequenz- und Amplitudenabhängigkeit, Modellierung, Validierung, Mehrkörpersimulation, MKS, ADAMS, FTire}},
  publisher    = {{Shaker}},
  title        = {{{Analyse der Reibleistungsverteilung im Reifenlatsch unter Berücksichtigung der Fahrwerkdynamik eines Mehrlenkerachssystems zur Bewertung des Reifenverschleißes}}},
  year         = {{2019}},
}

@phdthesis{10003,
  abstract     = {{Die Bestimmung des Frequenzübertragungsverhaltens von Strukturen mit nichtlinearer Charakteristik ist eine im technischen Bereich vielfach auftretende Aufgabe, z.B. für die genaue Bestimmung dynamischer Eigenschaften in der Entwurfsphase oder bei der Parametrierung von Modellen. Die typisch angewandten Verfahren zur Schwingungsmessung solcher Strukturen legen in der Regel ein lineares Strukturverhalten zu Grunde, oder sie erfordern einen hohen Zeit- und Messaufwand für die Abbildung des nichtlinearen Verhaltens; häufig in Verbindung mit einer starken Belastung der zu testenden Struktur. Die Bestimmung nichtlinearen Strukturverhaltens ist somit oft nicht effizient realisierbar. In der vorliegenden Arbeit wird ein neuer Ansatz zur Schwingungsanalyse nichtlinearer Strukturen mit von der Anregungsamplitude abhängigem Übertragungsverhalten vorgestellt. Dabei liegt ein Schwerpunkt auf der messtechnischen Bestimmung des nichtlinearen Verhaltens bei deutlich reduziertem Zeit- bzw. Messaufwand. Das Verfahren basiert auf einer Messmethode, die eine effiziente Bestimmung des nichtlinearen Kennfeldes der analysierten Struktur mit speziellen multiharmonischen Anregungssignalen ermöglicht. In Kombination mit einem fortschrittlichen Auswertealgorithmus kann eine vollständige Beschreibung des dynamischen Verhaltens in Form eines charakteristischen Diagramms generiert werden. Das Messverfahren wird durch eine Identifikationsroutine ergänzt, die die erforderliche Anzahl an Messungen nochmals reduzieren kann. Es ist als Mess-System auf Hard- und Software implementiert; der Funktionsnachweis erfolgt an verschiedenen Beispielen.}},
  author       = {{Sprock, Christian}},
  keywords     = {{Schwingungsanalyse, nichtlineare Strukturdynamik, Multisinus, Duffing-Schwinger, amplitudenabhängige Nichtlinearität, Peakbending, Backbone Curve, Schwingungsmessung, Frequenzverstimmung, Autoregression, Best Linear Approximation}},
  publisher    = {{Shaker}},
  title        = {{{Zeiteffiziente messtechnische Analyse glatt-nichtlinearen Schwingverhaltens dynamischer Strukturen}}},
  year         = {{2019}},
}

@phdthesis{10000,
  abstract     = {{Ultraschall wird zur Effizienzsteigerung in verfahrenstechnischen Prozessen eingesetzt. Die Betriebsparamter der Ultraschallsysteme werden empirisch ermittelt, da derzeit keine systematische Analyse der Wechselwirkung zwischen Ultraschallwandler und Schallfeld sowie kein Verfahren zur Messung der Kavitationsaktivität ohne zusätzlichen Sensor existieren. Auf Basis einer experimentellen Analyse des betrachteten sonochemischen Reaktors wird ein Finite-Elemente-Modell aufgebaut, das die Wechselwirkung zwischen Schallfeld und Ultraschallwandler berücksichtigt. Die modellbasierte Analyse zeigt, dass wegen der akustischen Eigenschaften des Autoklavs nur direkt an der Sonotrode Kavitation entsteht. Die Wechselwirkung zwischen Ultraschallwandler und Schallfeld ermöglicht Aussagen über das Schallfeld und die Kavitationsaktivität auf Basis der Rückwirkung auf den Ultraschallwandler. Die lineare Schalldruckverteilung ermöglicht eine Prognose über die Verteilung von Kavitationszonen. Das beschriebene Modell liefert wertvolle Erkenntnisse für die Auslegung, Analyse und Skalierung sonochemischer Reaktoren. Auf Grund der rauen Prozessrandbedingungen ist die Applikation von Sensoren zur Überwachung der Kavitationsaktivität in vielen sonochemischen Prozessen nicht möglich. Zur prozessbegleitenden Messung der Kavitationsaktivität wird ein Verfahren entwickelt, das die Bewertung der Kavitationsaktivität durch Auswertung der Rückwirkung auf den Ultraschallwandler erlaubt. Das Messverfahren ermöglicht eine vorhersagbare und reproduzierbare Durchführung kavitationsbasierter Prozesse und stellt eine wichtige Erweiterung für bestehende und neue Ultraschallsysteme dar.}},
  author       = {{Bornmann, Peter}},
  keywords     = {{Sonochemie, Akustische Kavitation, Kavitationsmessung, Kavitationsdetektion, FEM-Simulation Ultraschallwandler, Prozessüberwachung, FEM-Simulation Schallfeld, Self-Sensing, Piezoelektrische Ultraschallwandler, Ultraschallreinigung}},
  publisher    = {{Shaker}},
  title        = {{{Modellierung und experimentelle Charakterisierung der Wechselwirkung zwischen Ultraschallwandler und Flüssigkeit in kavitationsbasierten Prozessen}}},
  year         = {{2019}},
}

@inproceedings{15412,
  abstract     = {{<jats:p> Ultrasonic joining is a common industrial process. To build electrical connections in the electronics industry, uni-axial and torsional ultrasonic vibration have been used to join different types of workpieces for decades. Many influencing factors like ultrasonic power, bond normal force, bond duration and frequency are known to have a high impact on bond quality and reliability. Multi-dimensional bonding has been investigated in the past to increase ultrasonic power and consequently bond strength. This contribution is focused on the comparison of circular, multi-frequency planar and uniaxial vibration trajectories used for ultrasonic bonding of copper pins on copper substrate. Bond quality was analyzed by shear tests, scanning acoustic microscopy and interface cross-sections. </jats:p>}},
  author       = {{Schemmel, Reinhard and Eacock, Florian and Dymel, Collin and Hemsel, Tobias and Hunstig, Matthias and Brökelmann, Michael and Sextro, Walter}},
  booktitle    = {{International Symposium on Microelectronics}},
  issn         = {{2380-4505}},
  location     = {{Boston}},
  pages        = {{509--514}},
  title        = {{{Impact of multi-dimensional vibration trajectories on quality and failure modes in ultrasonic bonding}}},
  doi          = {{10.4071/2380-4505-2019.1.000509}},
  year         = {{2019}},
}

@article{10334,
  abstract     = {{Ultrasonic joining is a common industrial process. In the electronics industry it is used to form electrical connections, including those of dissimilar materials. Multiple influencing factors in ultrasonic joining are known and extensively investigated; process parameters like ultrasonic power, bond force, and bonding frequency of the ultrasonic vibration are known to have a high impact on a reliable joining process and need to be adapted for each new application with different geometry or materials. This contribution is focused on increasing ultrasonic power transmitted to the interface and keeping mechanical stresses during ultrasonic bonding low by using a multi-dimensional ultrasonic transducer concept. Bonding results for a new designed connector pin in IGBT-modules achieved by multi- and one-dimensional bonding are discussed.}},
  author       = {{Schemmel, Reinhard and Hemsel, Tobias and Dymel, Collin and Hunstig, Matthias and Brökelmann, Michael and Sextro, Walter}},
  issn         = {{0924-4247}},
  journal      = {{Sensors and Actuators A: Physical}},
  keywords     = {{Ultrasonic bonding, Ultrasonic welding, Multi-dimensional bonding, Complex vibration, Multi-frequent, Two-dimensional friction model}},
  pages        = {{653 -- 662}},
  title        = {{{Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding}}},
  doi          = {{10.1016/j.sna.2019.04.025}},
  volume       = {{295}},
  year         = {{2019}},
}

@inproceedings{13460,
  abstract     = {{Remaining useful lifetime (RUL) predictions as part of a condition monitoring system are focused in more and more research and industrial applications. To establish an efficient and precise estimate of the RUL of a technical product, different  uncertainties  have  to  be  handled.  To  minimize  the  uncertainties  of  the  RUL  estimation,  a  reliable and accurate prognostic approach as well as a good failure threshold are important. Regarding the failure threshold, most often  an  expert  sets  a  fixed  failure  threshold.  However,  neither  the  a  priori  known  failure  threshold  nor  a  fixedthreshold value are feasible in every application. Especially in the case of varying characteristics of the monitored system, an adaptive failure threshold is of great importance concerning the accuracy of the RUL estimation.  Rubber-metal-elements, which are used in a wide range of applications for vibration and sound isolation, are mon-itored by thermocouples to allow for lifetime predictions. Therefore, the element’s state is described by its temper-ature during its service life. Aiming to establish accurate RUL predictions of a rubber-metal-element, uncertainties due to nonlinear material characteristics and changing operational conditions have to be considered. Consequently, different temperature-based failure threshold definitions are implemented and compared within a particle filtering approach. }},
  author       = {{Bender, Amelie and Schinke, Lennart and Sextro, Walter}},
  booktitle    = {{Proceedings of the 29th European Safety and Reliability Conference (ESREL2019)}},
  editor       = {{Beer, Michael and Zio, Enrico}},
  isbn         = {{978-981-11-2724-3}},
  keywords     = {{RUL prediction, adaptive threshold, prognostics, condition monitoring}},
  location     = {{Hannover}},
  number       = {{29}},
  pages        = {{1262--1269}},
  title        = {{{Remaining useful lifetime prediction based on adaptive failure thresholds}}},
  year         = {{2019}},
}

@inproceedings{13461,
  abstract     = {{As the emerging digitalization of technical systems offers immense opportunities to be exploited by means of bigdata analysis, ubiquitous computing and largely networked systems, the digital twin comes into focus to combineall these aspects to an attendant model of an individual system during design phase as well as during operation.Since state-of-art technical systems are growing increasingly complex due to inherent intelligence and increasingfunctionality, i. e. autonomous behavior so far, it becomes considerably challenging to ensure reliability for thosesystems. Many methods were developed to support a reliability focused design or reliability-by-design approachesto tackle this challenge during design process. In field, data-based methods, i. e. condition monitoring enabled bythe rise of machine learning approaches, are exploited to ensure a reliable operation based on the current conditionof the monitored system. In order to take advantage of existing models of system reliability during design phaseand condition monitoring systems during operation, a method is proposed to combine both approaches in order toset up a digital twin with focus on system reliability. The base model of the digital twin is taken from the systemreliability model from the design phase and is used during operation and therein updated to the current reliabilitybased on the state estimation of the condition monitoring system. The approach is illustrated with a case study of arolling bearing test rig.}},
  author       = {{Kaul, Thorben and Bender, Amelie and Sextro, Walter}},
  booktitle    = {{Proceedings of the 29th European Safety and Reliability Conference (ESREL2019)}},
  editor       = {{Beer, Michael and Zio, Enrico}},
  isbn         = {{ 978-981-11-2724-3}},
  location     = {{Hannover}},
  number       = {{29}},
  pages        = {{2340--2347}},
  title        = {{{Digital Twin for Reliability Analysis During Design and Operation of Mechatronic Systems}}},
  year         = {{2019}},
}

@inbook{59978,
  abstract     = {{In latest body-in-white (BIW) concepts, engineers take into account a wider range of different materials to pursue a multi-material design approach. However, the lightweight potential of common materials like steel, aluminum or even fiber-reinforcement plastics (FRP) is limited. In keeping with the motto “the best material for the best application”, a new approach for a top-down material design is introduced. With the aim to develop an application tailored material, the multi-material concept is adapted for the thickness dimension of the component. Within this contribution a new optimization- based design methodology is applied on a stiffness relevant car body part. Starting with benchmark simulations of a reference BIW structure, a critical car body component is determined by an internal energy based method and a subsequent sensitivity analysis. The identified demonstrator component is later subdivided into multiple layers and submitted to a first optimization loop in which the developed methodology varies the material parameters for each single layer. Once an optimum for the through-thickness properties of the part is found, further optimization loops with concrete material pendants and manufacturing restrictions are carried out. The result is a hybrid laminate part consisting of steel and FRP plies. To achieve a further improvement in body characteristics and lightweight, the investigated part is redesigned by the aim of topology optimization. Finally, the tailored hybrid stacks are validated in BIW simulations and compared with the reference. The optimization-based approach allows a weight reduction up to 25 % while maintaining or even improving the BIW properties.}},
  author       = {{Camberg, Alan Adam and Stratmann, Ina and Tröster, Thomas}},
  booktitle    = {{Zukunftstechnologien für den multifunktionalen Leichtbau}},
  isbn         = {{9783662582053}},
  issn         = {{2524-4787}},
  publisher    = {{Springer Berlin Heidelberg}},
  title        = {{{TAILORED STACKED HYBRIDS – AN OPTIMIZATION-BASED APPROACH IN MATERIAL DESIGN FOR FURTHER IMPROVEMENT IN LIGHTWEIGHT CAR BODY STRUCTURES}}},
  doi          = {{10.1007/978-3-662-58206-0_12}},
  year         = {{2019}},
}

@inbook{13436,
  author       = {{Camberg, Alan Adam and Stratmann, Ina and Tröster, Thomas}},
  booktitle    = {{Technologies for economical and functional lightweight design}},
  isbn         = {{9783662582053}},
  issn         = {{2524-4787}},
  title        = {{{TAILORED STACKED HYBRIDS – AN OPTIMIZATION-BASED APPROACH IN MATERIAL DESIGN FOR FURTHER IMPROVEMENT IN LIGHTWEIGHT CAR BODY STRUCTURES}}},
  doi          = {{10.1007/978-3-662-58206-0_12}},
  year         = {{2019}},
}

@inproceedings{16030,
  author       = {{Triebus, Marcel and Bienia, S. and Marten, Thorsten and Tröster, Thomas and Dröder, K.}},
  booktitle    = {{Proceedings of 7th International Conference Hot Sheet Metal Forming of High-Performance Steel}},
  editor       = {{Oldenburg, Mats and Hardell, Jens and Casellas, Daniel}},
  isbn         = {{978-3-95735-104-3}},
  location     = {{Lulea, Sweden}},
  publisher    = {{Verlag Wissenschaftliche Scripten}},
  title        = {{{Press Hardening Integrated Structuring for Hybrid Components}}},
  year         = {{2019}},
}

@techreport{64186,
  author       = {{Marten, Thorsten and Tröster, Thomas and Salomon, Rainer}},
  isbn         = {{978-3-946885-33-7}},
  publisher    = {{Verlag und Vertriebsgesellschaft mbH}},
  title        = {{{P920 - Einsatz neuartiger Stähle und Generierung gradierter Leichtbaustrukturen im Presshärteprozess}}},
  year         = {{2019}},
}

@article{64780,
  abstract     = {{The increasing trend of multi-material and space-frame design in automotive car body constructions consolidates the need for mechanical joining technologies with one-sided accessibility. The high-speed joining process (also called “RIVTAC®” or “Impact”) is an innovative and flexible technology. In this process, a tack having a profiled shank and an ogival shaped tip is pushed into the joining partners with a speed of 20 to 40 m/s without any pre-punching. The plastic and friction work is converted into heat, which causes an abrupt rise of temperature in the joining zone. This improves the flowability of the material which leads to filling the annular grooves existing on the shank of the tack. Simultaneously, a force-fit is created between the sheet metal and the tack. Furthermore, the effects of inertia are used so that the thin-walled structures can be joined without any additional tools (e.g. a die). The joining process causes the deformation of the structure, which must be taken into account with regard to tolerances. The numerical simulation is a powerful tool to predict the deformation and the joinability of a complex structure as well as the mechanical properties of the connection. The paper is about the detailed process- and load-simulation of high-speed joining as well as the required experimental data basis, such as temperature and strain rate dependent flow curves. Furthermore, the friction parameters are very important for the physical consideration of the force-fit connection. Coupled structural-thermal simulations of an axisymmetric 2D-model are performed using explicit and implicit codes.}},
  author       = {{Meschut, Gerson and Hein, David and Gerkens, Michael}},
  issn         = {{2351-9789}},
  journal      = {{Procedia Manufacturing}},
  pages        = {{280--287}},
  publisher    = {{Elsevier BV}},
  title        = {{{Numerical simulation of high-speed joining of sheet metal structures}}},
  doi          = {{10.1016/j.promfg.2019.02.173}},
  volume       = {{29}},
  year         = {{2019}},
}

@article{19747,
  author       = {{Ditter, Jan and Meschut, Gerson and Wibbeke, Tim Michael}},
  journal      = {{Adhäsion Kleben&Dichten}},
  number       = {{6}},
  pages        = {{18--24}},
  title        = {{{Disjoining and joining concepts for adhesive-bonded lightweight structures}}},
  doi          = {{10.1007/s35145-019-0038-5}},
  year         = {{2019}},
}

@article{62775,
  author       = {{Schowtjak, Alexander and Wang, Shuhan and Hering, Oliver and Clausmeyer, Till and Lohmar, Johannes and Schulte, Robin and Ostwald, Richard and Hirt, Gerhard and Tekkaya, A. Erman}},
  issn         = {{0944-6524}},
  journal      = {{Production Engineering}},
  number       = {{1}},
  pages        = {{33--41}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Prediction and analysis of damage evolution during caliber rolling and subsequent cold forward extrusion}}},
  doi          = {{10.1007/s11740-019-00935-x}},
  volume       = {{14}},
  year         = {{2019}},
}

@article{62779,
  author       = {{Ostwald, Richard and Kuhl, Ellen and Menzel, Andreas}},
  issn         = {{0178-7675}},
  journal      = {{Computational Mechanics}},
  number       = {{3}},
  pages        = {{847--877}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{On the implementation of finite deformation gradient-enhanced damage models}}},
  doi          = {{10.1007/s00466-019-01684-5}},
  volume       = {{64}},
  year         = {{2019}},
}

@article{34437,
  abstract     = {{In oil-lubricated worm gears, all moving components cause power losses during operation. These losses depend, among other things, on the viscosity of the lubricant used, which in turn is determined by the temperature present in the gearbox. The dependency between the temperature and the power dissipation is mutual, and they influence each other. For the analysis of gearboxes under transient conditions, the relationship among operating conditions, power dissipation, and temperature must be considered. In this paper, a method for the analysis of these interrelationships is presented, which is based on the combination of tribological simulation and thermal networks. With the developed calculation model, the gearbox efficiency and the temperature over time can be estimated for arbitrary load cases. The calculation results are compared with measurements on a real gearbox.}},
  author       = {{Oehler, Manuel and Sauer, Bernd and Magyar, Balázs}},
  issn         = {{0742-4787}},
  journal      = {{Journal of Tribology}},
  number       = {{12}},
  title        = {{{Efficiency of Worm Gear Drives Under Transient Operating Conditions}}},
  doi          = {{10.1115/1.4044655}},
  volume       = {{141}},
  year         = {{2019}},
}

@inproceedings{25513,
  author       = {{Stüker, Daniel and Schöppner, Volker and Putzig, Katja and Giese, Ulrich}},
  location     = {{Nürnberg}},
  title        = {{{Investigations of High-Speed Rubber Extrusion with Consideration of Melt Homogeneity}}},
  year         = {{2018}},
}