@inproceedings{ThumannSchmauserBuchneretal., author = {Thumann, Philipp and Schmauser, Philipp and Buchner, Stefan and Wagner, Marcus}, title = {Festigkeitsbewertung von hochbeanspruchten Kupferkomponenten}, series = {Tagung Auslegung von Bauteilen aus Kupfer und Kupferlegierungen, 14. und 15. Mai 2025, Goslar}, booktitle = {Tagung Auslegung von Bauteilen aus Kupfer und Kupferlegierungen, 14. und 15. Mai 2025, Goslar}, publisher = {Deutscher Verband f{\"u}r Materialforschung und -pr{\"u}fung e.V.}, doi = {10.48447/Cu-2025-569}, abstract = {Es wird gezeigt, wie durch ein ganzheitliches Konzept, beginnend mit der Modellerstellung eines umfangreichen FE-Berechnungsmodells bis hin zur Festigkeitsbewertung unter Verwendung speziell ermittelter Werkstoffkenndaten, die Betriebssicherheit von hochbeanspruchten Kupferkomponenten sichergestellt werden kann. Mit den durchgef{\"u}hrten Werkstoffversuchsreihen an w{\"a}rmebehandelten und weichgegl{\"u}hten Kupferproben aus Cu-ETP R250 wurden neben den Standard-Werkstoffkenndaten wie Streckgrenze Rp, Zugfestigkeit Rm, Bruchdehnung A und Elastizit{\"a}tsmodul E Parameter zur Beschreibung des Werkstoffverhaltens bei zyklischer Belastung bestimmt. Zus{\"a}tzlich wurde wurde in Abh{\"a}ngigkeit der W{\"a}rmebehandlung und der damit verbundenen Ver- oder Entfestigung die Schwingfestigkeit eruiert. Somit ist mit der vorgestellten methodischen Vorgehensweise unter Verwendung tats{\"a}chlicher Werkstoffsteifigkeiten und umfangreicher Schwingfestigkeitsdaten eine Betriebsfestigkeitsbewertung m{\"o}glich.}, language = {de} } @techreport{ThumannSwidergalWagner, author = {Thumann, Philipp and Swidergal, Krzysztof and Wagner, Marcus}, title = {Experimentelle Ermittlung von Materialkennwerten und numerische Untersuchungen an einem gef{\"u}llten Elastomer}, series = {Forschungsbericht 2015 / Ostbayerische Technische Hochschule Regensburg}, journal = {Forschungsbericht 2015 / Ostbayerische Technische Hochschule Regensburg}, editor = {Baier, Wolfgang}, organization = {Ostbayerische Technische Hochschule Regensburg}, isbn = {978-3-00-048589-3}, pages = {49 -- 50}, language = {de} } @inproceedings{KochThumannWagner, author = {Koch, F. and Thumann, Philipp and Wagner, Marcus}, title = {Simulation with implicit time integration of high loaded areas of a forming tool for large presses using LS-DYNA}, series = {13. LS-DYNA Forum 2014, 6.-8. Oktober, Bamberg}, booktitle = {13. LS-DYNA Forum 2014, 6.-8. Oktober, Bamberg}, language = {en} } @inproceedings{ThumannSwidergalWagner, author = {Thumann, Philipp and Swidergal, Krzysztof and Wagner, Marcus}, title = {Calculation and validation of material tests with specimens made out of filled elastomers}, series = {10th European LS-DYNA Conference 2015, W{\"u}rzburg}, booktitle = {10th European LS-DYNA Conference 2015, W{\"u}rzburg}, abstract = {In deep-drawing dies for steel sheet parts of car bodies huge masses are moved. To prevent vibrations, which occur by sudden acceleration or stopping of those masses, elastomeric tubular dampers [1] are used. The dampers are made out of carbon filled elastomers. A good knowledge about the material behaviour of metals is available. But for the numerical investigation of complete deep-drawing dies the elastomeric dampers must be taken into account, too. To characterize the material behaviour of the elastomers tensile tests and pressure tests were carried out. The received material data from the tests were read into LS-DYNA [2]. Simulation models of the tensile test and the pressure test were created for LS-DYNA according to the real dimensions and boundary conditions. For validation purposes, calculations of loading cycles were done to enable a comparison between test data and simulation results. For the calculations the implemented material model *MAT_SIMPLIFIED_RUBBER_WITH_DAMAGE (*MAT_183) was used. The comparison shows a good fitting between the test data and the calculation results with respect to the mechanical material behaviour by using this material model in single loading cases. The settings from the simulations of material tests were transferred to simulations of dampers, which are used in deep-drawing dies.}, language = {en} } @article{ThumannMarburgMeinhardtetal., author = {Thumann, Philipp and Marburg, Steffen and Meinhardt, Josef and Saubiez, Jean-Marc and Hoogen, Michael and Suck, Bertram and Wagner, Marcus}, title = {Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron}, series = {steel research international}, volume = {90}, journal = {steel research international}, number = {7}, publisher = {Wiley}, doi = {10.1002/srin.201800620}, abstract = {This paper presents experimental fatigue tests on specially shaped specimens made from quenched and tempered steel 42CrMoS4 and nodular cast iron EN-GJS-600-3. The specimens are geometrically designed to resemble actual subcomponents of forming and cutting dies for sheet metal manufacturing. These subcomponents have failed in the past.Experiments are carried out using a fictive load-time function, which is a modification of an actually measured load curve and has variable mean and amplitude values. This first test series serves as a general validation of a subsequent fatigue analysis. A second test series is carried out with constant mean and amplitude values with a load ratio 𝑅≈0. Here, the load frequencies in the individual test runs are varied between f = 5 Hz and f = 45 Hz in order to investigate the influence of the frequency. Both series are performed on a servo-hydraulic testing machine.The experimental data is then statistically evaluated. The values for the scatter correlate with data from the literature. The data from the test series with the fictive load-time function can thus be used for subsequent validation of a fatigue calculation, which will be addressed in a future publication. Most significant are the findings from the second series of experiments with varied load frequencies, as a significant frequency influence could be detected. Furthermore, the hardening and softening behavior under cyclic loading and the fracture behavior of the materials are analyzed and compared with data from the literature.}, language = {en} } @article{ThumannBuchnerMarburgetal., author = {Thumann, Philipp and Buchner, Stefan and Marburg, Steffen and Wagner, Marcus}, title = {A comparative study of Glinka and Neuber approaches for fatigue strength assessment on 42CrMoS4-QT specimens}, series = {Strain}, volume = {2023}, journal = {Strain}, number = {e12470}, publisher = {Wiley}, issn = {1475-1305}, doi = {10.1111/str.12470}, pages = {21}, abstract = {In fatigue strength assessment, the methods based on ideal elastic stresses according to Basquin and the less established method based on elastic-plastic stress quantities according to Manson, Coffin and Morrow are applied. The former calculates loads using linear-elastic stresses, the latter requires elasticplastic evaluation parameters, such as stresses and strains. These can be determined by finite element analysis (FEA) with a linear-elastic constitutive law, and subsequent conversion to elastic-plastic loads, using the macro support formula by Neuber. In this contribution, an alternative approach to approximate elastic-plastic parameters proposed by Glinka is compared to the the strain-life method using Neuber's formula, as well as the stress-life method of Basquin. Several component tests on 42CrMoS4-QT specimens are investigated. To determine the input data for the fatigue strength evaluations, the entire test setup is computed by FEA. The nodal displacements from these validated full-model simulations are used as boundary conditions for a submodel simulation of a notch, whose results serve as input for the fatigue strength assessments. It is shown that all approaches provide a reliable assessment of components. Our key result is that the strain-life method using the concept by Glinka for notch stress computation, yields improved results in fatigue strength assessments.}, language = {en} } @inproceedings{ThumannWagnerSucketal., author = {Thumann, Philipp and Wagner, Marcus and Suck, Bertram and Meinhardt, Josef and Marburg, Steffen}, title = {Explicit and Implicit FE Simulations of Material Tests for Subsequent Durability Analyses}, series = {11th European LS-DYNA Conference, Salzburg}, booktitle = {11th European LS-DYNA Conference, Salzburg}, abstract = {Because of increased stroke rates the loads on forming tools increase too. To ensure a save design of components, durability analyses are intended. For this, simulation results from FE analyses are necessary. Therefore, it is desirable to use elements with quadratic function, because of a good stress approximation.The goal of the described investigation is to show if calculation results created by LS-DYNA [1] can be used for durability analyses. Especially the use of quadratic elements is investigated. For the evaluation, on the one hand explicit FE analyses of a special durability test are carried out. These analyses are validated by available test data. To create results for later durability analyses further FE analyses with implicit time discretisation are carried out. In this paper results of the investigations are presented and evaluated critically.}, language = {en} } @inproceedings{SwidergalThumannLubesederetal., author = {Swidergal, Krzysztof and Thumann, Philipp and Lubeseder, Christian and Wurmb, Ingo von and Meinhardt, Josef and Wagner, Marcus and Marburg, Steffen}, title = {Modeling and simulation of carbon black filled elastomer damper using LS-DYNA}, series = {LS-DYNA Forum 2014, Bamberg}, booktitle = {LS-DYNA Forum 2014, Bamberg}, language = {en} } @phdthesis{Thumann, author = {Thumann, Philipp}, title = {Lebensdauerbewertung von stoßartig belasteten Werkzeugkomponenten}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20210713-1554721-1-5}, pages = {IV, 143}, abstract = {Die vorliegende Arbeit beinhaltet ein neuartiges Gesamtkonzept zur Betriebsfestigkeitsbewertung von Werkzeugkomponenten unter Ber{\"u}cksichtigung dynamischer Einfl{\"u}sse. Es werden experimentelle Untersuchungen an Proben aus dem Verg{\"u}tungsstahl 42CrMoS4-QT sowie aus den Gusseisen mit Kugelgraphit EN-GJS-600-3 und mit Lamellengraphit EN-GJL-250 durchgef{\"u}hrt. Die Ergebnisse aus den Versuchen dienen zum einen zur allgemeinen Validierung von Betriebsfestigkeitsrechnungen. Zum anderen wird damit die Frequenzabh{\"a}ngigkeit in Bezug auf stoßartige Belastungen untersucht. Neben den validierten Berechnungsmodellen resultiert aus den Versuchungen die Erkenntnis einer ausgepr{\"a}gten Frequenzabh{\"a}ngigkeit, welche in zuk{\"u}nftigen Auslegungsrechnungen ber{\"u}cksichtigt werden muss. Bei Untersuchungen an einem Umform- und Beschneidewerkzeug wird die erarbeitete methodische Vorgehensweise aus den Versuchen angewandt. Es wird eine FE-Simulation eines Gesamtmodells erstellt, welche mit Messungen am Werkzeug validiert wird. Die Untersuchungen am Umform- und Beschneidewerkzeug liefern demnach ein validiertes FE-Simulationsmodell, das neben dem Werkzeug das Pressenmodell und die im Fertigungsprozess zu bearbeitende Platine beinhaltet. Unter Anwendung der Submodelltechnik an einer Einzelkomponente werden geeignete FE-Ergebnisse f{\"u}r eine Betriebsfestigkeitsrechnung generiert. Die Betriebsfestigkeitsrechnung erfolgt nach dem validierten Berechnungsmodell aus den Versuchen. Im Zuge der Analysen am Werkzeug findet das validierte Berechnungsmodell f{\"u}r den Gusswerkstoff EN-GJS-600-3 Anwendung. Die Berechnungsergebnisse korrelieren mit tats{\"a}chlich aufgetretenen Sch{\"a}den an einem Bauteil.}, language = {de} }