TY - CONF A1 - Wäsche, Rolf T1 - Tribological studies on polyetherimide composites sliding against steel under reciprocating conditions N2 - Results of tribological tests on polyetherimide composites were presented. The tests were carried out at room temperature as well as at 120°C. Counter body was steel 100Cr6. T2 - PolyTrib 2016. 2nd International Conference on Polymer Tribology CY - Ljubljana, Slovenia DA - 15.09.2016 KW - PEI KW - Composites KW - Polyetherimide KW - Temperature KW - Steel PY - 2016 AN - OPUS4-38690 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Harsha, A. P. A1 - Wäsche, Rolf T1 - Tribological studies on polyetherimide composites sliding against steel under reciprocating conditions N2 - The friction and wear properties of polyetherimide composites under dry oscillating sliding condition at room temperature (RT) as well as at elevated temperature (120 °C) was investigated. The polymer specimens were made to oscillate against steel cylinder as a counterpart. The friction and wear properties of PEI and composites were strongly influenced by the temperature. In case of carbon fiber composite abrasive action of carbon fibers has severely damaged the counterpart and resulted in accelerated wear of the composite at RT. Solid lubricants filled (PTFE, MoS2, graphite) along with glass fiber is beneficial in improving the friction and wear performance of the PEI composite at RT, whereas at elevated temperature wear performance was deteriorated. T2 - 2nd International Conference on Polymer Tribology CY - Ljubljana, Slovenia DA - 15.09.2016 KW - Polyetherimide KW - Composites KW - Friction KW - Wear KW - Temperature KW - Oscillating sliding KW - Solid lubricant KW - Fibers PY - 2016 AN - OPUS4-38135 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wäsche, Rolf A1 - Jayachandran, Ashok Raj A1 - Brandt, Guido A1 - Schmid, Thomas A1 - Tamura, T. A1 - Nakase, T. T1 - Tribofilm formation of a-C:H coatings under influence of temperature in boundary lubricated oscillating sliding against alumina and silicon nitride N2 - Gegenstand dieses Beitrags ist der Einfluss von Temperatur und Gegenkörperwerkstoff auf die Bildung von Tribofilmen auf a-C:H Beschichtungen. Dies wurde mit einer Kugel-Ebene Anordnung im geschmierten Kontakt untersucht. KW - a-C:H KW - Temperature KW - Tribofilm KW - Lubricated sliding KW - Alumina KW - Silicon nitride PY - 2018 SN - 0724-3472 VL - 65 IS - 5 SP - 28 EP - 37 PB - expert Verlag CY - Tübingen AN - OPUS4-46034 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Influence of temperature on tribological behaviour of DLC coatings under lubricated conditions up to 250°C N2 - The lecture deals with both friction and wear processes in ceramic - a-C:H Systems. T2 - AsiaTrib 2018 CY - Kuching, Malaysia DA - 16.09.2018 KW - Temperature KW - Lubricated sliding KW - Tribofilm PY - 2018 AN - OPUS4-46036 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf A1 - Ehrke, R. A1 - Kramer, R. A1 - Jayachandran, A. R. A1 - Brandt, G. T1 - Influence of temperature on tribological behaviour of DLC coatings under lubricated conditions up to 250°C N2 - In the present work it was shown that there is an influence of temperature and counter body material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel in a lubricated ball on disk contact situation. T2 - ASIATRIB 2018 CY - Kuching, Sarawak, Malaysia DA - 17.09.2018 KW - DLC KW - Temperature KW - Lubricated sliding PY - 2018 SP - 253 EP - 254 AN - OPUS4-46213 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kraus, David A1 - Trappe, Volker T1 - Cyclic fatigue behavior of glass fiber reinforced epoxy resin at ambient and elevated temperatures N2 - The fatigue behavior of ±45° glass fiber reinforced epoxy resin under cyclic mechanical and constant thermal loading is investigated in this study. Tests at three different temperature levels in the range 296 K to 343 K have been performed in order to create S-N curves for each temperature level. The specimen damage is measured in-situ using optical grayscale analysis. The characteristic damage state (CDS) is evaluated for each specimen. It is shown that the point of CDS is suitable as a failure criterion to compare the resulting S-N curves. With micromechanical formulations, the temperature-dependent matrix effort is calculated for each stress-temperature level. In terms of matrix effort, the longest fatigue life is reached at high temperatures, while, in terms of stress, the lowest fatigue life is reached at the highest temperatures. T2 - ECCM18 - 18th European conference on composite materials CY - Athens, Greece DA - 24.06.2018 KW - Composite KW - Fatigue KW - Thermomechanics KW - Residual stresses KW - Temperature PY - 2018 SP - 1 EP - 7 PB - European society for composite materials AN - OPUS4-45338 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kraus, David T1 - Cyclic fatigue behavior of glass fiber reinforced epoxy resin at ambient and elevated temperatures N2 - The fatigue behavior of ±45° glass fiber reinforced epoxy resin under cyclic mechanical and constant thermal loading is investigated in this study. Tests at three different temperature levels in the range 296 K to 343 K have been performed in order to create S-N curves for each temperature level. The specimen damage is measured in-situ using optical grayscale analysis. The characteristic damage state (CDS) is evaluated for each specimen. It is shown that the point of CDS is suitable as a failure criterion to compare the resulting S-N curves. With micromechanical formulations, the temperature-dependent matrix effort is calculated for each stress-temperature level. In terms of matrix effort, the longest fatigue life is reached at high temperatures, while, in terms of stress, the lowest fatigue life is reached at the highest temperatures. T2 - ECCM18 - 18th European conference on composite materials CY - Athens, Greece DA - 24.06.2018 KW - Composite KW - Fatigue KW - Thermomechanics KW - Residual stresses KW - Temperature PY - 2018 AN - OPUS4-45346 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf A1 - Hartelt, Manfred A1 - Ehrke, Roman ED - Silva Gomes, J. F. ED - Meguid, S. A. T1 - A study on tribological behaviour of a-C:H coatings under lubricated conditions up to 250°C N2 - The influence of temperature and counterbody material on the tribological properties of a-C:H coatings deposited on Cronidur 30 steel has been investigated in a lubricated ball on disk contact situation with alpha-alumina and silicon nitride as counterbodies. The results show, that the wear volumes of the systems increase exponentially with increasing temperature, for alpha-alumina more than for silicon nitride. Two different wear mechanisms seem to have a major influence: First, the abrasive action due to materials hardness and second, the tribo-oxidation when silicon nitride is counter material. T2 - 6th International Conference on Mechanics and Materials Design CY - P. Delgada/Azores, Portugal DA - 26.07.2015 KW - Diamond like carbon KW - Ceramics KW - Wear KW - Friction KW - Temperature PY - 2015 SP - Paper 5395, 445 EP - 446 AN - OPUS4-37014 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wäsche, Rolf T1 - Wear of alpha-Alumina in hot steam up to 300°C N2 - Selfmated alpha-alumina sliding couples habe been investigated under oscillating sliding at 100 N load in different humidity conditions in air as well as in hot steam up to temperatures of 300°C and ambient pressures up to 4 bar. T2 - 7th International Conference on Mechanics and Materials in Design CY - Albufeira, Portugal DA - 11.06.2017 KW - Alpha-alumina KW - Wear KW - Temperature KW - Abrasion PY - 2017 AN - OPUS4-41127 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rhode, Michael T1 - Specimen temperature during CGHE and influence on hydrogen determination N2 - Hydrogen determination in weld seams is standardized in ISO 3690. In accordance to this standard, a defined time for hydrogen collection has to be anticipated for different extraction temperatures. In other words, the temperature is the most important value that has to be monitored in addition to the aimed hydrogen determination. The specimen geometry has influence on the real sample temperature during CGHE vs. the adjusted furnace temperature. This presentation gives a short summary on possible influences on the "correct" hydrogen determination temperature during carrier gas hot extraction (CGHE) using infrared radiation driven furnace. The main findings are: (1) specimen surface is important in terms of polished or oxidized condition, (2) specimen geometry is important for fast heating, (3) PID-values of control software are a considerable influence to accelerate the heating process depite thick specimens and (4) independent sample temperature determination before CGHE is strongly recommended. T2 - Intermediate Meeting of IIW Subcommission II-E CY - Genoa, Italy DA - 05.03.2018 KW - Hydrogen KW - Welding KW - Carrier gas hot extraction KW - Temperature KW - Measurement PY - 2018 AN - OPUS4-44427 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -