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Kavitationsdynamik in geschmierten Kontakten - Weiterentwicklung eines Modells mit Blasendynamik 建立一种气泡力学模型
Tribologie und Schmierungstechnik Pub Date : 2021-12-15 DOI: 10.24053/tus-2021-0035
Th. Geike, Mark Hieke
{"title":"Kavitationsdynamik in geschmierten Kontakten - Weiterentwicklung eines Modells mit Blasendynamik","authors":"Th. Geike, Mark Hieke","doi":"10.24053/tus-2021-0035","DOIUrl":"https://doi.org/10.24053/tus-2021-0035","url":null,"abstract":"Cavitation is a widespread phenomenon in journal bearings and other lubricated contacts. In lubricated contacts, tensile stresses can occur in the lubricant as a result of cavitation dynamics. These tensile stresses, hardly known with respect to duration and magnitude, are investigated with a simulation model consisting of Reynolds equation and Rayleigh-Plesset equation for the negative squeeze motion of circular plate and spherical cap. The tensile stresses are practically relevant in calculating the opening times of valves (oil stiction). It may assumed that the short-time tensile stresses occurring in the simulation model also occur in other cases and have an influence on material fatigue and wear of the components involved and are thus practically relevant.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43581726","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}
引用次数: 0
Editorial - 2022 ist das Internationale Jahr des Glases 2022年是国际玻璃年
Tribologie und Schmierungstechnik Pub Date : 2021-12-15 DOI: 10.24053/tus-2021-0031
Manfred Junk
{"title":"Editorial - 2022 ist das Internationale Jahr des Glases","authors":"Manfred Junk","doi":"10.24053/tus-2021-0031","DOIUrl":"https://doi.org/10.24053/tus-2021-0031","url":null,"abstract":"","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43520157","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}
引用次数: 0
Rheological Characterization and EHL Simulation of a Grease in a Lubricated Sealing Contact 润滑密封接触中润滑脂的流变特性及EHL模拟
Tribologie und Schmierungstechnik Pub Date : 2021-12-15 DOI: 10.24053/tus-2021-0034
Niklas Bauer, S. Hahn, Simon Feldmeth, F. Bauer, K. Schmitz
{"title":"Rheological Characterization and EHL Simulation of a Grease in a Lubricated Sealing Contact","authors":"Niklas Bauer, S. Hahn, Simon Feldmeth, F. Bauer, K. Schmitz","doi":"10.24053/tus-2021-0034","DOIUrl":"https://doi.org/10.24053/tus-2021-0034","url":null,"abstract":"This contribution provides an insight into the tribological behavior of grease-lubricated contacts in pneumatic spool valves. As the properties of the grease are strongly non-Newtonian, multiple measurements were performed to parameterize two viscosity models, the Herschel-Bulkley and the Palacios-Palacios model. These models are integrated into an EHL simulation of the sealing contact and qualitatively compared for two temperatures. For that system, the total friction force is rather unaffected by the choice of the viscosity model. In addition, qualitatively similar results with about 10 % deviation from the non-Newtonian behavior could be obtained using a Newtonian approximation of the lubricant.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45683788","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}
引用次数: 0
Test and evaluation method for greases in grease-sealing rotary shaft seals 润滑脂密封转轴密封中润滑脂的试验和评定方法
Tribologie und Schmierungstechnik Pub Date : 2021-12-13 DOI: 10.24053/tus-2021-0028
S. Hahn, Simon Feldmeth
{"title":"Test and evaluation method for greases in grease-sealing rotary shaft seals","authors":"S. Hahn, Simon Feldmeth","doi":"10.24053/tus-2021-0028","DOIUrl":"https://doi.org/10.24053/tus-2021-0028","url":null,"abstract":"Grease-lubricated sealing systems show starved lubrication much more frequently than oil lubricated sealing systems. Different greases provide different lubricity to the sealing system. A test and evaluation method was developed that allows to assess the lubricity of different greases and to compare them with each other. The test and evaluation method consists of a test run and a subsequent analysis of the test components. The test run comprises a 24-hour speed collective and is performed on a test rig using real sealing system components. For the evaluation method, eight criteria are analysed, which are rated suitable for evaluating starved lubrication. The criteria include parameters measured during the test run, such as friction torque and temperature, as well as parameters inspected in the subsequent examination of all test components. All criteria are assessed and combined to an overall score, that allows to directly compare different greases with each other. The test and evaluation method developed reveals significant differences between 23 greases examined. Thus, the lubricity of greases in sealing systems can be analysed and compared much more quickly than in the past. Thanks to the rapid testing and focused evaluation of the relevant criteria, greases can be tested much more cost- and resource-efficiently than before.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47434408","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}
引用次数: 0
Verschleißsimulation grenz- und mischreibungsbehafteter Wälzkontakte 伪装的界限和扭曲的外壳
Tribologie und Schmierungstechnik Pub Date : 2021-12-13 DOI: 10.24053/tus-2021-0027
A. Winkler, M. Bartz, S. Wartzack
{"title":"Verschleißsimulation grenz- und mischreibungsbehafteter Wälzkontakte","authors":"A. Winkler, M. Bartz, S. Wartzack","doi":"10.24053/tus-2021-0027","DOIUrl":"https://doi.org/10.24053/tus-2021-0027","url":null,"abstract":"This contribution presents an approach for the numerical wear calculation of rolling/sliding-contacts. The finite element method based simulation model of Winkler [1] is extended to include contacts subject to boundary lubrication in addition to contacts subject to mixed lubrication. Using the example of an axial cylindrical roller bearing and two load cases, wear-modeling results of the mixed and boundary lubrication regime are illustrated.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43055863","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}
引用次数: 0
Verbesserte Tribokorrosionsbeständigkeit des martensitischen Stahls X54CrMoVN17-1 durch die Erzeugung von expanded martensite 产生膨胀马氏体提高X54CrMoVN17-1马氏体钢的摩擦腐蚀性能
Tribologie und Schmierungstechnik Pub Date : 2021-12-13 DOI: 10.24053/tus-2021-0026
Isabella Hahn, Sabine Siebert, W. Theisen, S. Weber
{"title":"Verbesserte Tribokorrosionsbeständigkeit des martensitischen Stahls X54CrMoVN17-1 durch die Erzeugung von expanded martensite","authors":"Isabella Hahn, Sabine Siebert, W. Theisen, S. Weber","doi":"10.24053/tus-2021-0026","DOIUrl":"https://doi.org/10.24053/tus-2021-0026","url":null,"abstract":"Seal-free, media-lubricated rolling bearings have a high-energy efficiency as the absence of the seal minimizes frictional loss and increases the efficiency of the driven machine. In addition, the environment is protected by the absence of hazardous lubricants. However, media-lubrication increases tribocorrosive attack on the bearing surface. Therefore, the tribocorrosion resistance of the bearing surface can be increased by a thermal surface treatment called low-temperature plasma nitriding. The produced “expanded martensite” in martensitic steels features a high hardness with comparatively good corrosion resistance. Tribocorrosion tests in 0.9 % NaCl-solution show that the material loss could be reduced by 70 % due to expanded martensite compared to the initial state of the steel.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47324262","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}
引用次数: 0
Vergleichende Untersuchung der Verschleißbilder von Steckverbindern aus Reibverschleiß- und Vibrationsprüfungen mit unterschiedlichen Prüfrichtungen 对照研究了不同测试的摩擦和震动连接器的磨损程度
Tribologie und Schmierungstechnik Pub Date : 2021-12-13 DOI: 10.24053/tus-2021-0030
Dirk Hilmert, Kevin Krüger, J. Song
{"title":"Vergleichende Untersuchung der Verschleißbilder von Steckverbindern aus Reibverschleiß- und Vibrationsprüfungen mit unterschiedlichen Prüfrichtungen","authors":"Dirk Hilmert, Kevin Krüger, J. Song","doi":"10.24053/tus-2021-0030","DOIUrl":"https://doi.org/10.24053/tus-2021-0030","url":null,"abstract":"In this study a comparison between the wear patterns of electrical connectors resulting from two different test types, namely fretting corrosion test and vibration test, is conducted. In both tests, the excitation directions include the mating direction as well as the orthogonal directions corresponding to the mating direction. Different measurement techniques are used to identify similarities and differences between the wear resulting from these test types. The results show fundamentally different critical directions with regard to wear for the respective test types. Furthermore, it is shown that the induced movement of the fretting tests lead to a higher degree of wear than the vibration tests. Also, it is not adequately possible to establish a direct relationship between the induced movement and the excitation amplitude caused by the attached wires since there is a superposition of several movements in the case of real applications.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68958297","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}
引用次数: 1
62. Tribologie-Fachtagung 2021 62.2021摩擦学研讨会
Tribologie und Schmierungstechnik Pub Date : 2021-09-21 DOI: 10.24053/tus-2021-0013
Manfred Jungk
{"title":"62. Tribologie-Fachtagung 2021","authors":"Manfred Jungk","doi":"10.24053/tus-2021-0013","DOIUrl":"https://doi.org/10.24053/tus-2021-0013","url":null,"abstract":"","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43171060","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}
引用次数: 0
Einfluss von Gruppe I Grundölen auf die Elastomerverträglichkeit von Radialwellendichtringen I族基础油对径向轴封弹性体相容性的影响
Tribologie und Schmierungstechnik Pub Date : 2021-09-21 DOI: 10.24053/tus-2021-0022
Kathrin Alt, Alexander Hüttinger, M. Wöppermann, J. Hermes, J. Braun, Tobias Schürmann
{"title":"Einfluss von Gruppe I Grundölen auf die Elastomerverträglichkeit von Radialwellendichtringen","authors":"Kathrin Alt, Alexander Hüttinger, M. Wöppermann, J. Hermes, J. Braun, Tobias Schürmann","doi":"10.24053/tus-2021-0022","DOIUrl":"https://doi.org/10.24053/tus-2021-0022","url":null,"abstract":"Gear oils on the basis of Group I base oils are the most widely used lubricant in industrial drive systems. With dynamic friction torque tests, the influence of Group I base oils from different regions/refineries on elastomer compatibility of radial shaft seals is investigated by dynamic friction torque tests. The results show a significant influence of base oil on the development of frictional torque in the sealing gap and the elastomer compatibility.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49204707","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}
引用次数: 0
Eine erste Abschätzung des globalen Energieverbrauchs von Kugellagern 这是全球储存电力消耗的初步评估
Tribologie und Schmierungstechnik Pub Date : 2021-09-21 DOI: 10.24053/tus-2021-0024
Vasilios Bakolas, P. Roedel, Oliver Koch, Michael Pausch
{"title":"Eine erste Abschätzung des globalen Energieverbrauchs von Kugellagern","authors":"Vasilios Bakolas, P. Roedel, Oliver Koch, Michael Pausch","doi":"10.24053/tus-2021-0024","DOIUrl":"https://doi.org/10.24053/tus-2021-0024","url":null,"abstract":"Rolling element bearings are found in every piece of machinery and are, therefore, a source of energy losses that can’t be ignored. During the last years a series of energy efficient bearings have been developed using specific designs or new materials aiming to reduce the losses of a bearing without sacrificing its load carrying capacity. The effect that these designs have on the global energy consumption hasn’t been quantified until now. A methodology to estimate the energy losses of the usage of a specific bearing type on a global scale is presented in this paper. The method, that is based on current standards, provides a first approximation for the determination of the energy losses of bearings and it is tested for its plausibility. The pros and cons of the proposed method are discussed, and a proposal is made on how to calculate the potential energy efficiency of newer designs.","PeriodicalId":53690,"journal":{"name":"Tribologie und Schmierungstechnik","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41819317","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}
引用次数: 0
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