T. Koch, R. Gläbe, Dominik Wenzel, Antje Siol, J. Köser, Jorg Thoeming, Shannon Mesing, Antonio Gavalás‐Olea, Imke Lang
Microalgae offer a very good basis for use as a sustainable source of raw materials for technical applications, since a large number of suitable chemical compounds can be obtained from them. In the research project ALBINA (German acronym for: Algae-based – Biological – Renewable), components of micro-algae have been processed in order to test them as additives for lubricant applications. The obtained results of the technical tests in machining and forming show a great potential of the algae extracts with regard to their use as EP/AW additives. Under the premise of certain process parameters, in metal cutting it is possible to achieve an equivalent tool life time compared to conventional additives, when algae substances are used. In metal forming, positive results have been obtained by using algae extracts in the ring compression test and deep drawing process. Part 1 of the publication describes the technical parameters and chemical analyses from the investigations, while Part 2 focuses on the results obtained from the technical tests.
{"title":"Nachhaltige Schmierstoff-Additive auf Basis von Mikroalgen in der Umformung und Zerspanung. Teil 1","authors":"T. Koch, R. Gläbe, Dominik Wenzel, Antje Siol, J. Köser, Jorg Thoeming, Shannon Mesing, Antonio Gavalás‐Olea, Imke Lang","doi":"10.24053/tus-2022-0014","DOIUrl":"https://doi.org/10.24053/tus-2022-0014","url":null,"abstract":"Microalgae offer a very good basis for use as a sustainable source of raw materials for technical applications, since a large number of suitable chemical compounds can be obtained from them. In the research project ALBINA (German acronym for: Algae-based – Biological – Renewable), components of micro-algae have been processed in order to test them as additives for lubricant applications. The obtained results of the technical tests in machining and forming show a great potential of the algae extracts with regard to their use as EP/AW additives. Under the premise of certain process parameters, in metal cutting it is possible to achieve an equivalent tool life time compared to conventional additives, when algae substances are used. In metal forming, positive results have been obtained by using algae extracts in the ring compression test and deep drawing process. Part 1 of the publication describes the technical parameters and chemical analyses from the investigations, while Part 2 focuses on the results obtained from the technical tests.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42440682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In order to be able to design the tribological system in a targeted way for use as a mechatronic actuator, e.g. for influencing vibration-dynamic properties, knowledge of the friction behavior occurring in the application is necessary. The method described in this paper supports the characterization of the dynamic, application-related friction behavior of a wet-running multi-plate clutch. This enables more accurate and in particular, application-related predictions of behavior in wet-running friction contact, such as the transmissible torque in dynamic operation with adjusted tribological systems. It supports the early stage design of functional extensions in the wet-running clutch system. In this paper, the method is used with two tribological system variants that vary in their friction lining. Differences in their dynamic friction coefficient behavior were identified.
{"title":"Untersuchung des anwendungsnahen, dynamischen Reibverhaltens nasslaufender Lamellenkupplungen am Beispiel zweier Tribosystemvarianten","authors":"A. Bischofberger, K. Bause, S. Ott, A. Albers","doi":"10.24053/tus-2022-0010","DOIUrl":"https://doi.org/10.24053/tus-2022-0010","url":null,"abstract":"In order to be able to design the tribological system in a targeted way for use as a mechatronic actuator, e.g. for influencing vibration-dynamic properties, knowledge of the friction behavior occurring in the application is necessary. The method described in this paper supports the characterization of the dynamic, application-related friction behavior of a wet-running multi-plate clutch. This enables more accurate and in particular, application-related predictions of behavior in wet-running friction contact, such as the transmissible torque in dynamic operation with adjusted tribological systems. It supports the early stage design of functional extensions in the wet-running clutch system. In this paper, the method is used with two tribological system variants that vary in their friction lining. Differences in their dynamic friction coefficient behavior were identified.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44352300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wet multi-plate clutches have a running-in phase at the start of operation in which the friction behavior can change significantly by adjustment of the friction surfaces. This running-in behavior can strongly depend on the characteristics of the friction system consisting of friction material, steel plate and fluid. With the aim of good controllability and thus high reliability of the clutch from the first shift, running-in processes should be less pronounced and should be completed quickly. The article describes the influences of the steel plate on the running-in behavior. Therefore, topographical measurements of the steel plate surfaces before and after test are carried out. To characterize the steel plate surfaces, a large number of 3D surface parameters are evaluated and compared to a newly developed parameter characterizing the running-in behavior.
{"title":"Einfluss der Stahllamellentopographie auf das Einlaufverhalten nasslaufender Lamellenkupplungen","authors":"K. Völkel, H. Pflaum, K. Stahl","doi":"10.24053/tus-2022-0011","DOIUrl":"https://doi.org/10.24053/tus-2022-0011","url":null,"abstract":"Wet multi-plate clutches have a running-in phase at the start of operation in which the friction behavior can change significantly by adjustment of the friction surfaces. This running-in behavior can strongly depend on the characteristics of the friction system consisting of friction material, steel plate and fluid. With the aim of good controllability and thus high reliability of the clutch from the first shift, running-in processes should be less pronounced and should be completed quickly. The article describes the influences of the steel plate on the running-in behavior. Therefore, topographical measurements of the steel plate surfaces before and after test are carried out. To characterize the steel plate surfaces, a large number of 3D surface parameters are evaluated and compared to a newly developed parameter characterizing the running-in behavior.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47412170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To increase robustness of wet vehicle clutches extensive knowledge about damage mechanism within tribological stressed clutch friction contact are necessary, to derive suitable requirements for clutch development. Therefore, on the one hand comprehensive investigations on component-, unit- and vehicle test level are necessary which offer, amongst other information, learnings about the clutch component causing a possible clutch failure. On the other hand, component analyses have to be done, which make it possible detecting wear sensitive component elements of the component composition itself. Present analysis show results of damage mechanism caused by a non-permissible water impact and related molecular changes in clutch oil and tribological stressed functional steel plate surfaces. Analysis were done with electrospray-ionisation mass spectrometry and time-of-flight secondary ion mass spectrometry.
{"title":"Analyse der durch Wasser verursachten Schädigungsmechanismen in nasslaufenden Fahrzeugkupplungen","authors":"M. Bäse, Astrid Lebel, R. Franz, Josef Prost","doi":"10.24053/tus-2022-0008","DOIUrl":"https://doi.org/10.24053/tus-2022-0008","url":null,"abstract":"To increase robustness of wet vehicle clutches extensive knowledge about damage mechanism within tribological stressed clutch friction contact are necessary, to derive suitable requirements for clutch development. Therefore, on the one hand comprehensive investigations on component-, unit- and vehicle test level are necessary which offer, amongst other information, learnings about the clutch component causing a possible clutch failure. On the other hand, component analyses have to be done, which make it possible detecting wear sensitive component elements of the component composition itself. Present analysis show results of damage mechanism caused by a non-permissible water impact and related molecular changes in clutch oil and tribological stressed functional steel plate surfaces. Analysis were done with electrospray-ionisation mass spectrometry and time-of-flight secondary ion mass spectrometry.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43284129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Julian Hasselmann, J. Kurzynski, M. Fobker, G. Gosheger, M. Schulze
To solve the issue of implant-associated infections, an antibacterial biocompatible multilayer coating was developed. For the approval of such a coating system as a medical device, the characterization of its mechanical and tribological properties is required. Since none of the existing test standards is fully applicable to the present coating system, a testing concept was developed to investigate the wettability, topography, morphology, thickness, hardness, Young’s modulus, adhesion strength and tribological characteristics of the multilayer coating.
{"title":"Testing concept for the mechanical-tribological characterization of an anti-bacterial coating system for implants","authors":"Julian Hasselmann, J. Kurzynski, M. Fobker, G. Gosheger, M. Schulze","doi":"10.24053/tus-2022-0009","DOIUrl":"https://doi.org/10.24053/tus-2022-0009","url":null,"abstract":"To solve the issue of implant-associated infections, an antibacterial biocompatible multilayer coating was developed. For the approval of such a coating system as a medical device, the characterization of its mechanical and tribological properties is required. Since none of the existing test standards is fully applicable to the present coating system, a testing concept was developed to investigate the wettability, topography, morphology, thickness, hardness, Young’s modulus, adhesion strength and tribological characteristics of the multilayer coating.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44707082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kristine Brittain, A. Morina, Liuquan Yang, A. Neville
MoS2 based solid lubricants are extensively used in space applications, where the materials are exposed to large fluctuations of temperatures. Storage takes place in ambient conditions and so does testing, to test the mechanical systems in the harshest environments. In this work, the coatings were exposed to 40 °C, 75 °C and 250 °C for 1 hour and cooled in air to determine the effect of exposure to increased temperature. It was confirmed that MoS2/Ti is thermally stable and not significantly affected by heat treatments. Pure MoS2 observes increased strain in the structure after exposure to 250 °C, which is due to oxygen substitution that takes place in S vacancies, followed by oxide formation. Although coefficient of friction is not affected by heat treatments, wear is reduced due to increase in hardness.
{"title":"Impact of thermal cycles on tribological properties and oxidation of MoS2 coatings","authors":"Kristine Brittain, A. Morina, Liuquan Yang, A. Neville","doi":"10.24053/tus-2022-0006","DOIUrl":"https://doi.org/10.24053/tus-2022-0006","url":null,"abstract":"MoS2 based solid lubricants are extensively used in space applications, where the materials are exposed to large fluctuations of temperatures. Storage takes place in ambient conditions and so does testing, to test the mechanical systems in the harshest environments. In this work, the coatings were exposed to 40 °C, 75 °C and 250 °C for 1 hour and cooled in air to determine the effect of exposure to increased temperature. It was confirmed that MoS2/Ti is thermally stable and not significantly affected by heat treatments. Pure MoS2 observes increased strain in the structure after exposure to 250 °C, which is due to oxygen substitution that takes place in S vacancies, followed by oxide formation. Although coefficient of friction is not affected by heat treatments, wear is reduced due to increase in hardness.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44478130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Achill Holzer, B. Reetz, Tileman Münch, Katharina Schmitz
n tribological systems with high loads, leaded special brasses are preferably used because of their excellent wear properties. Axial piston pumps and motors are a good example of such systems. In order to be able to dispense with lead-containing materials in the future, alternative materials are being tested. The result of this development are three new lead-free special brass materials presented in this article. For these, the effect Abstract of surface roughness (fine/coarse) and the manufacturing process (fine grinding + vibratory grinding/ lapping + vibratory grinding) on the running-in behavior was investigated. The specifications for this are based on experience with the lead-containing reference material CuZn40Al2Mn2Si.
{"title":"Experimentelle Untersuchungen zum Einlaufverhalten bleifreier Sondermessinglegierungen","authors":"Achill Holzer, B. Reetz, Tileman Münch, Katharina Schmitz","doi":"10.24053/tus-2022-0003","DOIUrl":"https://doi.org/10.24053/tus-2022-0003","url":null,"abstract":"n tribological systems with high loads, leaded special brasses are preferably used because of their excellent wear properties. Axial piston pumps and motors are a good example of such systems. In order to be able to dispense with lead-containing materials in the future, alternative materials are being tested. The result of this development are three new lead-free special brass materials presented in this article. For these, the effect Abstract of surface roughness (fine/coarse) and the manufacturing process (fine grinding + vibratory grinding/ lapping + vibratory grinding) on the running-in behavior was investigated. The specifications for this are based on experience with the lead-containing reference material CuZn40Al2Mn2Si.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48417294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Timo Rinschede, N. Felinks, D. Biermann, J. Kimm, S. Weber, P. Niederhofer, C. Herrera, M. Kalveram
High interstitial austenitic stainless CrMn steels are characterised by significantly increased work hardening ability and strength compared with conventional CrNi austenites, yet maintaining very high ductility and toughness. The machining of high interstitial CrMnCN steels is challenging in terms of process stability and economic efficiency. In this context, unfavourable chip forms, high thermomechanical loads and the superposition of different wear mechanisms in particular lead to challenges in turning operations. In the following article, different lubricant strategies are analysed for machining of CrMnN and CrMnCN austenitic stainless steels regarding chip form, mechanical tool loads and wear. Furthermore, the workpiece properties are considered with regard to surface roughness and microstructural changes.
{"title":"Turning of high strength, austenitic stainless steels","authors":"Timo Rinschede, N. Felinks, D. Biermann, J. Kimm, S. Weber, P. Niederhofer, C. Herrera, M. Kalveram","doi":"10.24053/tus-2022-0004","DOIUrl":"https://doi.org/10.24053/tus-2022-0004","url":null,"abstract":"High interstitial austenitic stainless CrMn steels are characterised by significantly increased work hardening ability and strength compared with conventional CrNi austenites, yet maintaining very high ductility and toughness. The machining of high interstitial CrMnCN steels is challenging in terms of process stability and economic efficiency. In this context, unfavourable chip forms, high thermomechanical loads and the superposition of different wear mechanisms in particular lead to challenges in turning operations. In the following article, different lubricant strategies are analysed for machining of CrMnN and CrMnCN austenitic stainless steels regarding chip form, mechanical tool loads and wear. Furthermore, the workpiece properties are considered with regard to surface roughness and microstructural changes.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46457006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Matzke, Susanne Beyer-Faiß, M. Grebe, Olav Höger
With increasing product lifetime requirements including reduced failure rates and higher loads greases are challenged and appropriate methods for grease service life estimation are necessary. Thermo-oxidation is one dominant degradation mechanism in many automotive applications at elevated operating temperatures. At 60th German Tribology Conference 2019, the Bosch method for quantitatively accelerated testing of thermo-oxidative stability of greases with the RapidOxy test apparatus was presented. This method differs from ASTM D8206 and DIN 51830-1 because it measures the grease in contact with the oxidation catalysts steel or brass and it is additionally used to calculate the Arrhenius activation energy of the grease. The oxidation induction time which is indicated by a significant decrease of the autoclave pressure gradient is applied as criterion for grease service life. The method was introduced to the DIN working group “grease ageing” and a laboratory study with participation of seven member laboratories was carried out. The objective of this study was to evaluate repeatability and reproducibility of this method and to verify the application of Arrhenius law for this mechanism. The study was carried out with a commercially available lubricating grease of NLGI-class 2 which consists of a lithium 12-hydroxystearate thickener, mineral oil and an additive package. The grease was spread in thin layers on either steel or brass plates and the activation energy was measured at 130 °C, 145 °C and 160 °C. The oxidation induction times at different temperatures were used to derive the activation energies of the Arrhenius equation on both plate materials. The applicability of Arrhenius law was verified by R2-values above 0,998 for a linear regression in the Arrhenius plot. Results indicated remarkably low scattering of values. The values of activation energies of this specific grease were in the range of 126 - 134 kJ/mol on steel and 99 - 113 kJ/mol on brass. The pressure curve as evaluation criterion was correlated with visual inspection and rheological flow curves. Based on the results of this collaborative study and on internal experiences at Bosch, this method was proposed to DIN in 2020 for definition as a new industry standard. The draft “mDIN 51830-2 Testing of greases – Determination of oxidation resistance of greases – Part 2: Determination of the Arrhenius activation energy of thermo-oxidative degradation” is currently in review of the DIN working group and an official round robin test with several greases and more laboratories is currently in preparation.
{"title":"Thermo-oxidative grease service life evaluation – laboratory study with the catalytically accelerated method using the RapidOxy","authors":"M. Matzke, Susanne Beyer-Faiß, M. Grebe, Olav Höger","doi":"10.24053/tus-2022-0005","DOIUrl":"https://doi.org/10.24053/tus-2022-0005","url":null,"abstract":"With increasing product lifetime requirements including reduced failure rates and higher loads greases are challenged and appropriate methods for grease service life estimation are necessary. Thermo-oxidation is one dominant degradation mechanism in many automotive applications at elevated operating temperatures. At 60th German Tribology Conference 2019, the Bosch method for quantitatively accelerated testing of thermo-oxidative stability of greases with the RapidOxy test apparatus was presented. This method differs from ASTM D8206 and DIN 51830-1 because it measures the grease in contact with the oxidation catalysts steel or brass and it is additionally used to calculate the Arrhenius activation energy of the grease. The oxidation induction time which is indicated by a significant decrease of the autoclave pressure gradient is applied as criterion for grease service life. The method was introduced to the DIN working group “grease ageing” and a laboratory study with participation of seven member laboratories was carried out. The objective of this study was to evaluate repeatability and reproducibility of this method and to verify the application of Arrhenius law for this mechanism. The study was carried out with a commercially available lubricating grease of NLGI-class 2 which consists of a lithium 12-hydroxystearate thickener, mineral oil and an additive package. The grease was spread in thin layers on either steel or brass plates and the activation energy was measured at 130 °C, 145 °C and 160 °C. The oxidation induction times at different temperatures were used to derive the activation energies of the Arrhenius equation on both plate materials. The applicability of Arrhenius law was verified by R2-values above 0,998 for a linear regression in the Arrhenius plot. Results indicated remarkably low scattering of values. The values of activation energies of this specific grease were in the range of 126 - 134 kJ/mol on steel and 99 - 113 kJ/mol on brass. The pressure curve as evaluation criterion was correlated with visual inspection and rheological flow curves. Based on the results of this collaborative study and on internal experiences at Bosch, this method was proposed to DIN in 2020 for definition as a new industry standard. The draft “mDIN 51830-2 Testing of greases – Determination of oxidation resistance of greases – Part 2: Determination of the Arrhenius activation energy of thermo-oxidative degradation” is currently in review of the DIN working group and an official round robin test with several greases and more laboratories is currently in preparation.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48146281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brake fluids lubricate dynamic seals in automotive brake systems. Depending on the fluid, such seals tend to show a stick-slip effect, which may cause disturbing squeal noises. In order to avoid such stick-slip-noise in future systems, it is required to characterize and rate the frictional behavior of different brake fluids in an appropriate way. This paper presents a tribometer test that enables to investigate the stick-slip-effect depending on the brake fluid. For an objective evaluation, an indicator value is introduced. Furthermore, this paper presents a dynamic friction model on basis of the Stribeck-curve that allows visualization and detailed investigation of the stick-slip-effect within finite element computation.
{"title":"Analyse von Einflussparametern auf den Stick-Slip-Effekt mittels Tribometerversuchen und FE-Simulation","authors":"Martin Wittmaack, Markus André, J. Molter","doi":"10.24053/tus-2022-0002","DOIUrl":"https://doi.org/10.24053/tus-2022-0002","url":null,"abstract":"Brake fluids lubricate dynamic seals in automotive brake systems. Depending on the fluid, such seals tend to show a stick-slip effect, which may cause disturbing squeal noises. In order to avoid such stick-slip-noise in future systems, it is required to characterize and rate the frictional behavior of different brake fluids in an appropriate way. This paper presents a tribometer test that enables to investigate the stick-slip-effect depending on the brake fluid. For an objective evaluation, an indicator value is introduced. Furthermore, this paper presents a dynamic friction model on basis of the Stribeck-curve that allows visualization and detailed investigation of the stick-slip-effect within finite element computation.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46188383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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