TY - CONF A1 - Kovalev, A. A1 - Spaltmann, Dirk A1 - Woydt, Mathias A1 - Meng, Y. T1 - Characterization of low wear on top aperities N2 - The aim of this research is to characterize a surface that has experienced low wear on asperities. The procedure used is similar to an Abbott-Firestone approach and based on functional bearing of projected area, surface area and material volume. Surface features extracted from surface height maps provide more comprehensive information about topography changes due to wear. Thus, they were used to detect low wear volumes on the top of asperities. T2 - The 6th World Tribology Congress CY - Beijing, China DA - 17.09.2017 KW - Simulation KW - Wear KW - Asperities KW - Abbott KW - Firestone PY - 2017 SP - 1 EP - 4 AN - OPUS4-42465 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk ED - Burbank, J.-T. ED - Woydt, Mathias T1 - Kaltverfestigung und reaktive Grenzschichten in metallischen Wälzkontakten N2 - Aus Schmierstoffen gebildete Tribofilme bestimmen das Reibungs- und Verschleißverhalten von Tribosystemen neben der Fresslasttragefähgikeit. Die Kaltverfestigung stellt einen weiteren Mechanismus insbesondere zum Verschleißschutz dar. Unter Wälzreibung wird das funktionale Profil organischer und metallorganischer Tribofilme sowie von Kaltverfestigung verglichen, die auf verschiedenen Stahlmetallurgien innerhalb von 10.000 Überrollungen in einem 2Disk-Prüfstand erzeugt wurden. Dabei wurden Hertzsche Kontaktspannungen ober von P0max=2,14 GPa (FZG14) eingesetzt. T2 - 58. Tribologie-Fachtagung 2017 CY - Göttingen, Germany DA - 25.09.2017 KW - Kaltverfestigung KW - Wälzreibung KW - Tribofilme PY - 2017 SN - 978-3-9817451-1-5 SP - 229 EP - 242 AN - OPUS4-42470 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Alternative approach to simulate an entire particle erosion experiment N2 - The cause and type of solid particle erosion varies across different industries and locations in plants, for instance the particles could be volcanic ash in aero-engines, fly ash in boilers, exfoliated scale in steam turbines or mineral matter in oil excavation. In all cases the durability of materials can be improved through better surface engineering and coatings, but the development of these is restricted also due to lack of generic models. In this respect, the simulation of a single impact with finite element methods using 100.000 knots would take about 15 minutes. In order to simulate an entire particle erosion experiment, up to one billion of such impacts would have to be considered. In order to simulate an entire particle erosion experiment, the current work presents an alternative approach capable of calculating about half a billion impacts on a substrate in less than six hours on a standard PC. The predictions of the simulation will be compared to a steel sample at 600°C eroded by aluminum oxide particles with a velocity around 210 m/s. T2 - The 6th World Tribology Congress - WTC 2017 CY - Beijing, China DA - 17.09.2017 KW - Particle erosion KW - Simulation KW - Wear PY - 2017 AN - OPUS4-42448 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Alternative approach to simulate an entire particle erosion experiment N2 - The cause and type of solid particle erosion varies across different industries and locations in plants, for instance the particles could be volcanic ash in aero-engines, fly ash in boilers, exfoliated scale in steam turbines or mineral matter in oil excavation. In all cases the durability of materials can be improved through better surface engineering and coatings, but the development of these is restricted also due to lack of generic models. In this respect, the simulation of a single impact with finite element methods using 100.000 knots would take about 15 minutes. In order to simulate an entire particle erosion experiment, up to one billion of such impacts would have to be considered. In order to simulate an entire particle erosion experiment, the current work presents an alternative approach capable of calculating about half a billion impacts on a substrate in less than six hours on a standard PC. The predictions of the simulation will be compared to a steel sample at 600°C eroded by aluminum oxide particles with a velocity around 210 m/s. T2 - The 6th World Tribology Congress CY - Beijing, China DA - 17.09.2017 KW - Particle erosion KW - Simulation KW - Wear PY - 2017 SP - 1 EP - 3 AN - OPUS4-42449 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Reibungsminderung in Wälzkontakten durch Werkstoff- und/oder Schmierstoffkonzepte N2 - Reibungsminderungspotentiale von überrollbeständigen Dünnschichten auf Standardsubstraten und von beschichteten und unbeschichteten alternativen Stählen sowie durch Schmierstoffadditive werden in ein Erstbefüllungsöl bei 120°C und Pressung bis zu P0mean= 2,5 GPa aufgezeigt. T2 - 7. VDI-Fachtagung CY - Würzburg, Germany DA - 27.06.2017 KW - Reibung KW - Schmierstoffe KW - wälzen PY - 2017 AN - OPUS4-41126 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - An alternative approach to simulating an entire particle erosion experiment N2 - In the present work an approach is presented which combines various aspects of the former models with probability considerations. It is used to simulate the impact of more than one billion Alumina particles onto a steel substrate. This approach permits the simulation of an entire erosion experiment on an average PC within about six hours. KW - Particle erosion KW - Wear KW - DEM KW - FEM KW - Monte-Carlo simulation KW - Alumina PY - 2018 DO - https://doi.org/10.3390/lubricants6010029 VL - 6 IS - 29 SP - 1 EP - 11 PB - MDPI AN - OPUS4-44542 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Spaltmann, Dirk A1 - Woydt, Mathias T1 - Reibungs- und Verschleißminderung in Wälzkontakten durch Werkstoff- und/oder Schmierstoffkonzepte N2 - Leichtbaukonzepte zur Reduzierung der CO2 Emission gehen häufig mit erhöhten Anforderungen an die Belastbarkeit tribologisch beanspruchter Oberflächen einher. In Wälzkontakten jeglicher Art erhöhen reduzierte Abmessungen oder ansteigende Kräfte die Hertz'schen Kontaktspannungen, oftmals verbunden mit dem Wunsch nach einer Reduzierung der Reibung. Löschungsmöglichkeiten bieten alternative Schmierstoffe, Dünnschichten und/oder verbesserte Stahllegierungen. In mehreren Forschungsvorhaben wurden Reibverhalten und Überrollbeständigkeiten derartiger Tribosysteme in einem Zweischeiben-Wälzprüfstand (2Disk) unter Misch- bzw. Grenzreibung bei bis zu 10 Millionen Überrollungen ermittelt. Dabei betrug die Öltemperatur 120°C und die maximale Flächenpressung oberhalb von 2,25 GPa. Insgesamt wurde eine Vielzahl von Kombinationen charakterisiert. Ein Teil dieser Ergebnisse wird in dem Vortrag exemplarisch vorgestellt. T2 - DVM-Workshop 2018 "Zuverlässigkeit tribologischer Systeme" CY - Berlin, Germany DA - 16.05.2018 KW - Reibung KW - Verschleiß KW - Schmierstoffe KW - Dünnschichten KW - Stahllegierungen PY - 2018 AN - OPUS4-44957 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bonse, Jörn A1 - Kirner, Sabrina V. A1 - Griepentrog, Michael A1 - Spaltmann, Dirk A1 - Krüger, Jörg T1 - Femtosecond laser texturing of surfaces for tribological applications N2 - Laser texturing is an emerging technology for generating surface functionalities on basis of optical, mechanical, or chemical properties. Taking benefit of laser sources with ultrashort (fs) pulse durations features outstanding precision of machining and negligible rims or burrs surrounding the laser-irradiation zone. Consequently, additional mechanical or chemical post-processing steps are usually not required for fs-laser surface texturing (fs-LST). This work aimed to provide a bridge between research in the field of tribology and laser materials processing. The paper reviews the current state-of-the-art in fs-LST, with a focus on the tribological performance (friction and wear) of specific self-organized surface structures (so-called ripples, grooves, and spikes) on steel and titanium alloys. On the titanium alloy, specific sickle-shaped hybrid micro-nanostructures were also observed and tribologically tested. Care is taken to identify accompanying effects affecting the materials hardness, superficial oxidation, nano- and microscale topographies, and the role of additives contained in lubricants, such as commercial engine oil. KW - Femtosecond laser processing KW - Surface texture KW - Laser-induced periodic surface structures (LIPSS) KW - Friction KW - Wear PY - 2018 UR - http://www.mdpi.com/1996-1944/11/5/801 DO - https://doi.org/10.3390/ma11050801 SN - 1996-1944 VL - 11 IS - 5 SP - 801, 1 EP - 19 PB - MDPI AG CY - Basel, Switzerland AN - OPUS4-44905 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bonse, Jörn A1 - Kirner, Sabrina V. A1 - Epperlein, Nadja A1 - Spaltmann, Dirk A1 - Krüger, Jörg T1 - Surface functionalization by laser-induced periodic surface structures (LIPSS) N2 - In this contribution the mechanisms of formation and current applications of LIPSS are reviewed, including the colorization of technical surfaces, the control of surface wetting properties, the mimicry of the natural texture of animal integuments, the tailoring of surface colonization by bacterial biofilms, and the improvement of the tribological performance of nanostructured metal surfaces. T2 - 10th Stuttgart Laser Technology Forum 2018 CY - Stuttgart, Germany DA - 05.06.2018 KW - Laser-induced periodic surface structures (LIPSS) KW - Femtosecond laser ablation KW - Surface functionalization KW - Wetting KW - Tribology KW - Biofilms PY - 2018 SP - 35 AN - OPUS4-45128 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Woydt, Mathias A1 - Burbank, J.-Th. A1 - Spaltmann, Dirk T1 - Generation of defined tribofilms and their stability under slip-rolling in a 2disk test rig N2 - In the present work it was shown that the performance of tribofilms which were generated in 2Disk test rigs on widely used reference steels during slip-rolling in the mixed/boundary lubrication regime at 120°C is compared to those created on alternative steels. KW - slip-rolling KW - 2Disk KW - friction KW - wear KW - tribofilms KW - additive KW - test method PY - 2018 DO - https://doi.org/10.1520/MPC20170078 SN - 2379-1365 SN - 2165-3992 VL - 7 IS - 3 SP - 213 EP - 225 PB - ASTM International CY - West Conshohocken, Pa. AN - OPUS4-46304 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -