TY - GEN
AU - Beckendorf, Björn
ID - 52317
TI - Self-Stabilizing Skip-Graph with Growth-bounded Metric
ER -
TY - CHAP
AU - Abdelrahem, Mohammed
ED - Dawwa, Hany
ID - 52319
KW - Dialog der Religionen
KW - interreligiöser Dialog
KW - Hass
KW - Hassrede
T2 - khiṭāb al-karāhiya wa-taḥaddiyāt al-ḥiwār – taqāṭuʿāt wa-muwāǧahāt (Hassrede und die Herausforderungen des Dialogs – Überschneidungen und Konfrontationen)
TI - khiṭāb al-karāhiya – iṭlāla ʿala taʾwīlāt maghlūṭa li-n-nuṣūṣ al-islāmiya (Hassrede – Überblick auf kritische Interpretationen islamischer Texte)
ER -
TY - JOUR
AB - AbstractExplainable artificial intelligence has mainly focused on static learning scenarios so far. We are interested in dynamic scenarios where data is sampled progressively, and learning is done in an incremental rather than a batch mode. We seek efficient incremental algorithms for computing feature importance (FI). Permutation feature importance (PFI) is a well-established model-agnostic measure to obtain global FI based on feature marginalization of absent features. We propose an efficient, model-agnostic algorithm called iPFI to estimate this measure incrementally and under dynamic modeling conditions including concept drift. We prove theoretical guarantees on the approximation quality in terms of expectation and variance. To validate our theoretical findings and the efficacy of our approaches in incremental scenarios dealing with streaming data rather than traditional batch settings, we conduct multiple experimental studies on benchmark data with and without concept drift.
AU - Fumagalli, Fabian
AU - Muschalik, Maximilian
AU - Hüllermeier, Eyke
AU - Hammer, Barbara
ID - 50262
IS - 12
JF - Machine Learning
KW - Artificial Intelligence
KW - Software
SN - 0885-6125
TI - Incremental permutation feature importance (iPFI): towards online explanations on data streams
VL - 112
ER -
TY - CONF
AU - Fumagalli, Fabian
AU - Muschalik, Maximilian
AU - Hüllermeier, Eyke
AU - Hammer, Barbara
ID - 48775
T2 - ESANN 2023 proceedings
TI - On Feature Removal for Explainability in Dynamic Environments
ER -
TY - CONF
AU - Fumagalli, Fabian
AU - Muschalik, Maximilian
AU - Kolpaczki, Patrick
AU - Hüllermeier, Eyke
AU - Hammer, Barbara
ID - 52230
T2 - NeurIPS 2023 - Advances in Neural Information Processing Systems
TI - SHAP-IQ: Unified Approximation of any-order Shapley Interactions
VL - 36
ER -
TY - JOUR
AU - Demir, Caglar
AU - Wiebesiek, Michel
AU - Lu, Renzhong
AU - Ngonga Ngomo, Axel-Cyrille
AU - Heindorf, Stefan
ID - 46248
JF - ECML PKDD
TI - LitCQD: Multi-Hop Reasoning in Incomplete Knowledge Graphs with Numeric Literals
ER -
TY - CONF
AU - Intveen, Julie
AU - Hohwiller, Peter
ID - 52341
TI - The True Story of a Total Fake – Eine Untersuchung des didaktischen Potentials von Netflix‘ Inventing Anna
ER -
TY - CONF
AU - Intveen, Julie
ID - 52340
TI - Fictions of Identity – A Didactic Exploration of TV Series
ER -
TY - CONF
AU - Intveen, Julie
ID - 52339
TI - Fictions of Identity – A Didactic Approach to Serial Literacy
ER -
TY - JOUR
AU - Intveen, Julie
ID - 52336
IS - 4
JF - Englisch betrifft uns
TI - Chasing the American Dream: Chances and challenges of immigrant families – a media task
ER -
TY - JOUR
AB - The use of iron as a replacement for noble metals in photochemical and photophysical applications is challenging due to the typically fast deactivation of short-lived catalytically active states. Recent success of a cyclometalated iron(III) complex utilizing a bis-tridentate ligand motif inspired the use of phenyl-1H-pyrazole as a bidentate ligand. Five complexes using the tris(1-phenylpyrazolato-N,C2)iron(III) complex scaffold are presented. In addition to the parent complex, four derivatives with functionalization in the meta-position of the phenyl ring are thoroughly investigated by single crystal diffractometry, UV-Vis-spectroscopy, and cyclic voltammetry. Advanced X-ray spectroscopy in the form of X-ray absorption and emission spectroscopy allows unique insights into the electronic structure as well as DFT calculations. The ligand design leads to overlapping MLCT and LMCT absorption bands, and emissive behavior is suppressed by low-lying MC states.
AU - Hirschhausen, Tanja
AU - Fritsch, Lorena
AU - Lux, Franziska
AU - Steube, Jakob
AU - Schoch, Roland
AU - Neuba, Adam
AU - Egold, Hans
AU - Bauer, Matthias
ID - 46548
IS - 7
JF - Inorganics
KW - Inorganic Chemistry
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
KW - pc2-ressources
SN - 2304-6740
TI - Iron(III)-Complexes with N-Phenylpyrazole-Based Ligands
VL - 11
ER -
TY - JOUR
AU - Rogolino, Andrea
AU - Filho, José B. G.
AU - Fritsch, Lorena
AU - Ardisson, José D.
AU - da Silva, Marcos A. R.
AU - Atta Diab, Gabriel Ali
AU - Silva, Ingrid Fernandes
AU - Moraes, Carlos André Ferreira
AU - Forim, Moacir Rossi
AU - Bauer, Matthias
AU - Kühne, Thomas D.
AU - Antonietti, Markus
AU - Teixeira, Ivo F.
ID - 46547
IS - 13
JF - ACS Catalysis
KW - Catalysis
KW - General Chemistry
KW - pc2-ressources
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
SN - 2155-5435
TI - Direct Synthesis of Acetone by Aerobic Propane Oxidation Promoted by Photoactive Iron(III) Chloride under Mild Conditions
VL - 13
ER -
TY - JOUR
AB - Photoactive chromium(III) complexes saw a conceptual breakthrough with the discovery of the prototypical molecular ruby mer-[Cr(ddpd)2]3+ (ddpd = N,N′-dimethyl-N,N′-dipyridin-2-ylpyridine-2,6-diamine), which shows intense long-lived near-infrared (NIR) phosphorescence from metal-centered spin-flip states. In contrast to the numerous studies on chromium(III) photophysics, only 10 luminescent molybdenum(III) complexes have been reported so far. Here, we present the synthesis and characterization of mer-MoX3(ddpd) (1, X = Cl; 2, X = Br) and cisfac-[Mo(ddpd)2]3+ (cisfac-[3]3+), an isomeric heavy homologue of the prototypical molecular ruby. For cisfac-[3]3+, we found strong zero-field splitting using magnetic susceptibility measurements and electron paramagnetic resonance spectroscopy. Electronic spectra covering the spin-forbidden transitions show that the spin-flip states in mer-1, mer-2, and cisfac-[3]3+ are much lower in energy than those in comparable chromium(III) compounds. While all three complexes show weak spin-flip phosphorescence in NIR-II, the emission of cisfac-[3]3+ peaking at 1550 nm is particularly low in energy. Femtosecond transient absorption spectroscopy reveals a short excited-state lifetime of 1.4 ns, 6 orders of magnitude shorter than that of mer-[Cr(ddpd)2]3+. Using density functional theory and ab initio multireference calculations, we break down the reasons for this disparity and derive principles for the design of future stable photoactive molybdenum(III) complexes.
AU - Kitzmann, Winald R.
AU - Hunger, David
AU - Reponen, Antti-Pekka M.
AU - Förster, Christoph
AU - Schoch, Roland
AU - Bauer, Matthias
AU - Feldmann, Sascha
AU - van Slageren, Joris
AU - Heinze, Katja
ID - 52345
IS - 39
JF - Inorganic Chemistry
KW - Inorganic Chemistry
KW - Physical and Theoretical Chemistry
SN - 0020-1669
TI - Electronic Structure and Excited-State Dynamics of the NIR-II Emissive Molybdenum(III) Analogue to the Molecular Ruby
VL - 62
ER -
TY - JOUR
AB - Macrocyclization reactions are still challenging due to competing oligomerization, which requires the use of small substrate concentrations. Here, the cationic tungsten imido and tungsten oxo alkylidene N-heterocyclic carbene complexes [[W(N-2,6-Cl2-C6H3)(CHCMe2Ph(OC6F5)(pivalonitrile)(IMes)+ B(ArF)4−] (W1) and [W(O)(CHCMe2Ph(OCMe(CF3)2)(IMes)(CH3CN)+ B(ArF)4−] (W2) (IMes=1,3-dimesitylimidazol-2-ylidene; B(ArF)4−=tetrakis(3,5-bis(trifluoromethyl)phenyl borate) have been immobilized inside the pores of ordered mesoporous silica (OMS) with pore diameters of 3.3 and 6.8 nm, respectively, using a pore-selective immobilization protocol. X-ray absorption spectroscopy of W1@OMS showed that even though the catalyst structure is contracted due to confinement by the mesopores, both the oxidation state and structure of the catalyst stayed intact upon immobilization. Catalytic testing with four differently sized α,ω-dienes revealed a dramatically increased macrocyclization (MC) and Z-selectivity of the supported catalysts compared to the homogenous progenitors, allowing high substrate concentrations of 25 mM. With the supported complexes, a maximum increase in MC-selectivity from 27 to 81 % and in Z-selectivity from 17 to 34 % was achieved. In general, smaller mesopores exhibited a stronger confinement effect. A comparison of the two supported tungsten-based catalysts showed that W1@OMS possesses a higher MC-selectivity, while W2@OMS exhibits a higher Z-selectivity which can be rationalized by the structures of the catalysts.
AU - Ziegler, Felix
AU - Bruckner, Johanna R.
AU - Nowakowski, Michal
AU - Bauer, Matthias
AU - Probst, Patrick
AU - Atwi, Boshra
AU - Buchmeiser, Michael R.
ID - 52344
IS - 21
JF - ChemCatChem
KW - Inorganic Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Catalysis
SN - 1867-3880
TI - Macrocyclization of Dienes under Confinement with Cationic Tungsten Imido/Oxo Alkylidene N‐Heterocyclic Carbene Complexes
VL - 15
ER -
TY - JOUR
AB - The effects of backbone amine functionalization in three new homoleptic C^N^C type ruthenium(II) complexes bearing a tridentate bis‐imidazole‐2‐ylidene pyridine ligand framework are characterized and studied by single crystal diffraction, electrochemistry, optical spectroscopy and transient absorption spectroscopy in combination with ab initio DFT calculations. Functionalization by dimethylamine groups in 4‐position of the pyridine backbone significantly influences the properties of the complexes as revealed by comparison with the unfunctionalized references. As a result of the amine functionalization, a higher molar absorption coefficient of the MLCT bands, a decreased photoluminescence quantum yield at room temperature together with a shortened excited state lifetime but an improved photostability is observed. Introduction of electron donating and withdrawing groups at the NHC unit modifies the electronic and optical properties, such as the oxidation potential, absorption and emission properties, and the lifetimes of the excited states.
AU - Fritsch, Lorena
AU - Vukadinovic, Yannik
AU - Lang, Moritz
AU - Naumann, Robert
AU - Bertrams, Maria-Sophie
AU - Kruse, Ayla
AU - Schoch, Roland
AU - Müller, Patrick
AU - Neuba, Adam
AU - Dierks, Philipp
AU - Lochbrunner, Stefan
AU - Kerzig, Christoph
AU - Heinze, Katja
AU - Bauer, Matthias
ID - 49608
JF - ChemPhotoChem
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Analytical Chemistry
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
KW - pc2-ressources
SN - 2367-0932
TI - Chemical and photophysical properties of amine functionalized bis‐NHC‐pyridine‐RuII complexes
ER -
TY - GEN
AU - Beutner, Marc
AU - Schneider, Jennifer Nicole
ID - 47901
T2 - International Conference on Industry Sciences and Computer Science Innovation
TI - The use of IT and OER to support remote sustainable work in Europeans Green Economy
ER -
TY - CHAP
AU - Schwede, Jana
AU - Harteis, Christian
ED - Müller, Claudia
ED - Pranger, Jan
ED - Reißland, Jens
ID - 52330
T2 - Nachhaltigkeitsorientierte Weiterbildungsdidaktik: Die doppelte Multiplikatorenqualifizierung
TI - Weiterbildung des Weiterbildungspersonals – Vorwiegend eine Aufgabe des Lernens am Arbeitsplatz
VL - 73
ER -
TY - JOUR
AU - Diederich, Malte
AU - Spatz, Verena
AU - Bauer, Anna Brigitte
ID - 52358
JF - Phydid B, Didaktik der Physik, Beiträge zur DPG-Frühjahrstagung (2022)
TI - Auswirkungen einer Online-Intervention (Mindset, Lerntechniken) auf den Studieneinstieg
ER -
TY - CONF
AB - Megatrends, such as digitization or sustainability, are confronting the product management of manufacturing companies with a variety of challenges regarding the design of future products, but also the management of the actual products. To successfully position their products in the market, product managers need to gather and analyze comprehensive information about customers, developments in the products’ environment, product usage, and more. The digitization of all aspects of life is making data on these topics increasingly available – via social media, documents, or the internet of things from the products themselves. The systematic collection and analysis of these data enable the exploitation of new potentials for the adaption of existing products and the creation of the products of tomorrow. However, there are still no insights into the main concepts and cause-effect relationships in exploiting data-driven approaches for product management. Therefore, this paper aims to identify the main concepts and advantages of data-driven product management. To answer the corresponding research questions a comprehensive systematic literature review is conducted. From its results, a detailed description of the main concepts of data-driven product management is derived. Furthermore, a taxonomy for the advantages of data-driven product management is presented. The main concepts and the taxonomy allow for a deeper understanding of the topic while highlighting necessary future actions and research needs.
AU - Fichtler, Timm
AU - Grigoryan, Khoren
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ID - 52369
KW - Product Lifecyle Management (PLM)
KW - Data Analytics
KW - Data-driven Design
KW - Engineering Management
KW - Lifecycle Data
T2 - 2023 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)
TI - Towards a Data-Driven Product Management – Concepts, Advantages, and Future Research
ER -
TY - GEN
AU - Vernholz, Mats
ED - Perla, Loredana
ED - Agrati, Laura Sara
ED - Vinci, Viviana
ED - Scarinci, Alessia
ID - 52370
SN - 9791255681038
T2 - Living and Leading in the Next Era: Connecting Teaching, Research, Citizenship and Equity
TI - Academic self-concepts of pre-service technology teachers for vocational education in Germany according to the TPACK- Model
ER -
TY - GEN
AU - Hollenhorst, Viola
AU - Kenig, Eugeny Y.
ID - 43047
TI - CFD-Untersuchungen der Fluiddynamik und des Wärmetransports an rauen Oberflächen
ER -
TY - THES
AB - Füllkörper spielen in industriellen Trennprozessen eine wichtige Rolle bspw. bei der Reinigung industrieller Abgase durch Absorption. Die Trennleistung von Füllkörperkolonnen wird üblicherweise mittels vereinfachter Stufenmodelle ermittelt, deren Modellparameter experimentell bestimmt werden müssen. Dies stellt eine große Schwäche von Stufenmodellen dar, da diese Parameterim Allgemeinen nicht auf verschiedene Stoffsysteme und Füllkörpertypen übertragbar sind.In dieser Arbeit wird ein Modell, basierend auf dem hydrodynamischen Analogieansatz, zur Beschreibung von Absorptionsvorgängen in Füllkörperkolonnen vorgestellt. Dabei ist die Geometrie der festen Phase direkt abhängig von der Füllkörpergeometrie und der Stochastik der Schüttung. Die tatsächlichen Strömungsverhältnisse in Füllkörperkolonnen werden erfasst und durch eine Kombination vereinfachter charakteristischer Strömungsformen reproduziert. Dies erlaubt die Verwendung rigoroser Transportgleichung. Dadurch enthält das Modell weniger experimentell zu ermittelnde Parameter und ist damit unabhängiger von Experimenten als vereinfachte Stufenmodelle. Das Modell wurde gegen experimentelle Daten zur CO2-Absorption in wässrige Natronlauge validiert. Mit dem entwickelten Modell wurde anschließend eine Parameterstudie durchgeführt, die der Unterstützung der Entwicklung neuer Füllkörpergeometrien dient. Dazu wurde eine Simulationsstudie durchgeführt, die den Einfluss der Füllkörpergeometrie auf die Trennleistung untersucht.
AU - Salten, Alexander Heinrich Johannes
ID - 52402
TI - Modellierung der Reaktivabsorption in regellosen Schüttungen und modellbasierte Optimierung von Füllkörpern mit dem Ansatz der hydrodynamischen Analogien
ER -
TY - CONF
AU - Haak, Viktor
AU - Meschut, Gerson
AU - Epperlein, Maike
AU - Schiebahn, Alexander
AU - Reisgen, Uwe
ID - 50547
T2 - 25. DVS-Sondertagung Widerstandsschweißen
TI - Einseitiges Widerstandselementschweißen für die stahlintensive Mischbauweise
ER -
TY - JOUR
AU - Hochhaus, Thorben
AU - Bruns, Bastian
AU - Grünewald, Marcus
AU - Riese, Julia
ID - 47551
JF - Computers & Chemical Engineering
KW - Computer Science Applications
KW - General Chemical Engineering
SN - 0098-1354
TI - Optimal scheduling of a large-scale power-to-ammonia process: Effects of parameter optimization on the indirect demand response potential
VL - 170
ER -
TY - JOUR
AU - Röder, Lilli Sophia
AU - Gröngröft, Arne
AU - Grünewald, Marcus
AU - Riese, Julia
ID - 51360
JF - Chemical Engineering Transactions
TI - Demand Side Management Implementation in Downstream Digestate Treatment of a Biomethane Biorefinery
VL - 105
ER -
TY - JOUR
AB - AbstractThe time‐dependent adjustment of a system's power demand simultaneously with current power generation is commonly referred to as demand side management (DSM). DSM strategies are based on the flexibility to purchase electricity at times when prices are low, which can result in monetary benefits. One option to increase the flexibility of continuously operated processes is to oversize them. From an economic point of view, this leads to an increased investment. DSM only serves an economic purpose if the monetary benefits exceed this increase in capital costs. The main goal of this contribution is to develop a decision support tool to help evaluate unit operations regarding their feasibility for DSM implementation. In a case study, the decision support tool was applied to show its functionality on a biomethane production plant. The results show that with the help of the decision support tool, evaluating unit operations concerning their economic DSM potential is possible.
AU - Röder, Lilli
AU - Etzold, Hendrik
AU - Gröngröft, Arne
AU - Grünewald, Marcus
AU - Riese, Julia
ID - 49580
JF - Biofuels, Bioproducts and Biorefining
KW - Renewable Energy
KW - Sustainability and the Environment
KW - Bioengineering
SN - 1932-104X
TI - Decision support tool to determine the suitability of demand side management implementation in continuously operated processes – A biorefinery case study
ER -
TY - JOUR
AU - Intveen, Julie
ID - 52337
IS - 4
JF - Englisch betrifft uns
TI - “I was trying to protect you. I was trying to keep you safe.” Parental surveillance in the Black Mirror episode Arkangel
ER -
TY - JOUR
AU - Intveen, Julie
AU - Bauer, Maike
ID - 52334
IS - 5
JF - Englisch betrifft uns
TI - The United Kingdom: A Multicultural Society Education as a key to life in mixed communities
ER -
TY - JOUR
AU - Intveen, Julie
AU - Bauer, Maike
ID - 52335
IS - 5
JF - Englisch betrifft uns
TI - The Royal Divide - Exploring the impact of Megxit on the future of the British monarchy
ER -
TY - CHAP
AU - Abrego, Verónica
AU - Henke, Ina
AU - Kißling, Magdalena
AU - Lammer, Christina
AU - Leuker, Maria-Th.
ED - Abgrego, Verónica
ED - Henke, Ina
ED - Kißling, Magdalena
ED - Lammer, Christina
ED - Leuker, Maria-Th.
ID - 50212
T2 - Intersektionalität und erzählte Welten. Fachwissenschaftliche und fachdidaktische Perspektiven auf Literatur und Medien
TI - Intersektionalität und erzählte Welten – Einführung
ER -
TY - GEN
AU - Lammer, Christina
ID - 52389
TI - Het verschil tussen strips en graphic novels (in Vlaanderen)
ER -
TY - JOUR
AU - Genovese, Matteo
AU - Schlüter, Alexander
AU - Scionti, Eugenio
AU - Piraino, Francesco
AU - Corigliano, Orlando
AU - Fragiacomo, Petronilla
ID - 52204
IS - 44
JF - International Journal of Hydrogen Energy
KW - Hydrogen economy
KW - Green hydrogen
KW - Power-to-X
KW - Hydrogen-to-X
KW - Sector coupling
SN - 0360-3199
TI - Power-to-hydrogen and hydrogen-to-X energy systems for the industry of the future in Europe
VL - 48
ER -
TY - GEN
AB - We use QCD kinetic theory to compute photon production in the chemically
equilibrating Quark-Gluon Plasma created in the early stages of high-energy
heavy-ion collisions. We do a detailed comparison of pre-equilibrium photon
rates to the thermal photon production. We show that the photon spectrum
radiated from a hydrodynamic attractor evolution satisfies a simple scaling
form in terms of the specific shear viscosity $\eta/s$ and entropy density
$dS/d\zeta \sim {\scriptstyle \left(T\tau^{1/3}\right)^{3/2}}_\infty$. We
confirm the analytical predictions with numerical kinetic theory simulations.
We use the extracted scaling function to compute the pre-equilibrium photon
contribution in $\sqrt{s_{NN}}=2.76\,\text{TeV}$ 0-20\% PbPb collisions. We
demonstrate that our matching procedure allows for a smooth switching from
pre-equilibrium kinetic to thermal hydrodynamic photon production. Finally, our
publicly available implementation can be straightforwardly added to existing
heavy ion models.
AU - Oscar Garcia-Montero, Oscar Garcia-Montero
AU - Mazeliauskas, Aleksas
AU - Plaschke, Philip
AU - Schlichting, Sören
ID - 50171
T2 - arXiv:2308.09747
TI - Pre-equilibrium photons from the early stages of heavy-ion collisions
ER -
TY - THES
AU - Schneider, Jennifer Nicole
ID - 48010
TI - Open Educational Resources in der beruflichen Bildungslandschaft
ER -
TY - JOUR
AU - Al-Lami, Abbas Jarullah Sangoor
AU - Kenig, Eugeny
ID - 40645
JF - International Journal of Heat and Mass Transfer
TI - Experimental Study of an Internally Channeled Tube Heat Exchanger under Turbulent Flow Conditions
VL - 214
ER -
TY - GEN
AU - Unterstell, Rembert
ID - 51019
TI - Der Wirtschaft auch in der Krise das Atmen erlauben, Pandemie und Ökonomie – Interview mit Steuerexpertin Caren Sureth-Sloane
ER -
TY - GEN
AU - Unterstell, Rembert
ID - 51024
TI - Allowing the Economy to Breathe Even During the Crisis – Interview with Tax Expert Caren Sureth-Sloane
ER -
TY - CONF
AB - Abstract. The application of the mechanical joining process clinching allows the assembly of different sheet metal materials with a wide range of material thickness configurations, which is of interest for lightweight multi-material structures. In order to be able to predict the clinched joint properties as a function of the individual manufacturing steps, current studies focus on numerical modeling of the entire clinching process chain. It is essential to be able to take into account the influence of the joining process-induced damage on the load-bearing capacity of the joint during the loading phase. This study presents a numerical damage accumulation in the clinching process based on an implemented Hosford-Coulomb failure model using a 3D clinching process model applied on the aluminum alloy EN AW-6014 in temper T4. A correspondence of the experimentally determined failure location with the element of the highest numerically determined damage accumulation is shown. Moreover, the experimentally determined failure behavior is predicted to be in agreement in the numerical loading simulation with transferred pre-damage from the process simulation.
AU - Bielak, Christian Roman
AU - Böhnke, Max
AU - Friedlein, Johannes
AU - Bobbert, Mathias
AU - Mergheim, Julia
AU - Steinmann, Paul
AU - Meschut, Gerson
ID - 43090
SN - 2474-395X
T2 - Materials Research Proceedings
TI - Numerical analysis of failure modeling in clinching process chain simulation
ER -
TY - CONF
AB - Abstract. In the numerical simulation of mechanical joining technologies such as clinching, the material modeling of the joining parts is of major importance. This includes modeling the damage and failure behavior of the materials in accordance with varying occurring stress states. This paper presents a calibration method of three different fracture models. The calibration of the models is done by use of experimental data from a modified punch test, tensile test and bulge test in order to map the occurring stress states from clinching processes and to precisely model the resulting failure behavior. Experimental investigations were carried out for an aluminum alloy EN AW-6014 in temper T4 and compared with the simulative results generated in LS-DYNA. The comparison of force-displacement curves and failure initiation shows that the Hosford–Coulomb model predicts the failure behavior for the material used and the tests applied with the best accuracy.
AU - Böhnke, Max
AU - Bielak, Christian Roman
AU - Friedlein, Johannes
AU - Bobbert, Mathias
AU - Mergheim, Julia
AU - Steinmann, Paul
AU - Meschut, Gerson
ID - 43462
SN - 2474-395X
T2 - Materials Research Proceedings
TI - A calibration method for failure modeling in clinching process simulations
ER -
TY - CHAP
AU - Böhnke, Max
AU - Bielak, Christian Roman
AU - Bobbert, Mathias
AU - Meschut, Gerson
ID - 52454
SN - 2195-4356
T2 - Lecture Notes in Mechanical Engineering
TI - Experimental and Numerical Investigation of Clinched Joints Under Shear Tensile Loading at High Strain Rates
ER -
TY - CONF
AU - Friedlein, Johannes
AU - Bielak, Christian Roman
AU - Böhnke, Max
AU - Bobbert, Mathias
AU - Mergheim, Julia
AU - Steinmann, Paul
AU - Meschut, Gerson
ID - 43463
T2 - Materials Research Proceedings
TI - Influence of plastic orthotropy on clinching of sheet metal
ER -
TY - CHAP
AU - Breckner, Anne
AU - Schroeter-wittke, Harald
ED - Janus, Richard
ID - 52456
T2 - Katastrophen. Religiöse Bildung angesichts von Kriegs- und Krisenerfahrungen im 19. und 20. Jahrhundert
TI - Ambivalenzkompetenz? Rückblick auf die Tagung 'Katastrophen'. Religiöse Bildung angesichts von Kriegs- und Krisenerfahrungen im 19. und 20. Jahrhundert am Vortag des russischen Angriffs auf die Ukraine
VL - 26
ER -
TY - GEN
AU - Breckner, Anne
ID - 52466
TI - Karneval und OWL
ER -
TY - GEN
AU - Breckner, Anne
ID - 52464
TI - Auszeit
ER -
TY - JOUR
AU - Breckner, Anne
AU - Kamcili-Yildiz, Naciye
ID - 52457
IS - 4
JF - Religion 5-10
TI - Was brauchst du? Engagement für die Mitmenschen in Christentum und Islam. Interreligiöse Unterrichtsreihe im Themenheft Diakonie
VL - 52
ER -
TY - GEN
AU - Knorr, Lukas
AU - Schlosser, Florian
AU - Meschede, Henning
ID - 47540
TI - Economic Integration of a High-Temperature Heat Pump with Flexible Part-load Operation
ER -
TY - CONF
AU - Rauhaus, Johann
AU - Schadomsky, Magnus
AU - Magyar, Balázs
AU - Zimmer, Detmar
ID - 49555
SN - 978-3-9817451-8-4
T2 - Tagungsband der 64. Tribologie-Fachtagung
TI - Untersuchung des Reibungs- und Deformationsverhaltens von schnelllaufenden Bremsen
ER -
TY - GEN
AU - Klassen, Alexander
ID - 52480
TI - Fast Partial Reconfiguration for ReconOS64 on Xilinx MPSoC Devices
ER -
TY - CONF
AU - Annemann, C.
AU - Niemann, T.
AU - Gerick, J.
AU - Drossel, Kerstin
ID - 52489
T2 - Vortrag auf der Tagung 'Schule und Lehrkräfte. Bildung neu denken' der Sektion Empirische Bildungsforschung (AEPF/KBBB) in der DGfE. Universität Potsdam
TI - Prädiktoren für und Effekte von digitalisierungsbezogene(n) Lehrkräftefortbildungen in Deutschland –Ergebnisse einer Sekundäranalyse
ER -
TY - CONF
AB - Fused Deposition Modeling (FDM) is an additive manufacturing process to produce
complex thermoplastic geometries layer by layer. The filament is melted in a nozzle, iteratively
deposited, and then cools down. Due to the solidification process, the deposited filament strands
deviate from their intended position due to shrinkage, resulting in significant geometric deviations
in the final part. In terms of dimensional accuracy, there is a need for optimization, especially for
local curved geometries in relation to the global part with higher nominal dimensions. The aim of
this study is to investigate the size and shape deviations for cylindrical FDM elements and to
compensate the expected deformations by using an in-house software with adaptive scaling factors
in the x-y plane. Previous studies mainly focus on simple, non-curved objects, this study also
considers the influence of curvature and global as well as local deviations on the final part.
AU - Koers, Thorsten
AU - Magyar, Balázs
ED - Beaman, Joseph
ID - 47084
T2 - Proceedings of the 34th Annual International Solid Freeform Fabrication Symposium 2023
TI - Determination and Compensation of the Shrinkage Behavior of Cylindrical Elements in the FDM Process
VL - 34
ER -