{"title":"Cavitation Erosion Behavior of 2205 and 2507 Duplex Stainless Steels in Distilled Water and Artificial Seawater","authors":"Yapeng Wu, Ying Lian, Yang Li, Mao Feng","doi":"10.2474/trol.18.482","DOIUrl":"https://doi.org/10.2474/trol.18.482","url":null,"abstract":"","PeriodicalId":23314,"journal":{"name":"Tribology Online","volume":"17 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201465","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}
{"title":"Tribological Studies of Hybrid Composites of Epoxy with Solid (UHMWPE) and Liquid (Squalane) Lubricant Fillers","authors":"Sujeet K. Sinha, Naoya Hatano, Tomoko Hirayama","doi":"10.2474/trol.18.469","DOIUrl":"https://doi.org/10.2474/trol.18.469","url":null,"abstract":"","PeriodicalId":23314,"journal":{"name":"Tribology Online","volume":"369 ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139203065","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}
Reduction of heat and mechanical losses is a critical factor in reducing CO2 emissions and fuel consumption of automotive engines. Toward that end, it is necessary to investigate the lubrication conditions of engine sliding surfaces and instantaneous heat flux in the combustion chamber in order to obtain experimental data for validating computer-aided engineering (CAE) calculations. The authors used thin-film sensors to measure the distribution of the oil film pressure on the sliding surfaces of engine parts including pistons, bearings and gear tooth surfaces. This paper describes the structure and configuration of the thin-film sensors and the measurement system used for direct observation, especially of piston pins, and presents the measured results.
{"title":"Development of Oil Film Pressure Measurement System for Engine Sliding Parts","authors":"Masakuni Oikawa, Michiyasu Owashi, Yuji Mihara, Takashi Maeno","doi":"10.2474/trol.18.449","DOIUrl":"https://doi.org/10.2474/trol.18.449","url":null,"abstract":"Reduction of heat and mechanical losses is a critical factor in reducing CO2 emissions and fuel consumption of automotive engines. Toward that end, it is necessary to investigate the lubrication conditions of engine sliding surfaces and instantaneous heat flux in the combustion chamber in order to obtain experimental data for validating computer-aided engineering (CAE) calculations. The authors used thin-film sensors to measure the distribution of the oil film pressure on the sliding surfaces of engine parts including pistons, bearings and gear tooth surfaces. This paper describes the structure and configuration of the thin-film sensors and the measurement system used for direct observation, especially of piston pins, and presents the measured results.","PeriodicalId":23314,"journal":{"name":"Tribology Online","volume":"21 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227797","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}
Tribological behaviour of sliding surfaces with star shaped micro-dimples on one of the surface is reported. One wall is smooth and sliding on the other fixed dimpled wall with constant velocity. Effect of star shaped dimple and oriented star shaped dimple has been compared with circular shaped dimple for hydrodynamic pressure generation and tribological behaviour. Effect of dimple depth, dimple area density and sliding speed on tribological behaviour were also analyzed. The results demonstrate that an unconventional star-shaped and orientated star-shaped dimple produces a larger net hydrodynamic pressure in the fluid domain and provides better stability between the sliding surfaces than a circular-shaped dimple. It is shown that geometric parameters like dimple depth and dimple area density and operation parameter like sliding speed affects the hydrodynamic average pressure and tribological behaviour of sliding surfaces significantly. The experimental findings validate the analytical and CFD findings.
{"title":"The Effect of Star Shaped Dimples on Sliding Surfaces under Hydrodynamic Lubrication","authors":"Hardik Gangadia, Saurin Sheth","doi":"10.2474/trol.18.457","DOIUrl":"https://doi.org/10.2474/trol.18.457","url":null,"abstract":"Tribological behaviour of sliding surfaces with star shaped micro-dimples on one of the surface is reported. One wall is smooth and sliding on the other fixed dimpled wall with constant velocity. Effect of star shaped dimple and oriented star shaped dimple has been compared with circular shaped dimple for hydrodynamic pressure generation and tribological behaviour. Effect of dimple depth, dimple area density and sliding speed on tribological behaviour were also analyzed. The results demonstrate that an unconventional star-shaped and orientated star-shaped dimple produces a larger net hydrodynamic pressure in the fluid domain and provides better stability between the sliding surfaces than a circular-shaped dimple. It is shown that geometric parameters like dimple depth and dimple area density and operation parameter like sliding speed affects the hydrodynamic average pressure and tribological behaviour of sliding surfaces significantly. The experimental findings validate the analytical and CFD findings.","PeriodicalId":23314,"journal":{"name":"Tribology Online","volume":"21 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227794","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}
This study uses the molecular dynamics simulations to investigate the friction between the iron plate sliding against the partially frozen graphite nanoparticle. The graphite nanoparticle is divided into the two parts along the normal direction: the part contacts to the iron plate is controlled temperature and the lower other is held in the frozen situation. We detect the friction dependent on the frozen height, the angle between the sliding direction and the graphene surfaces by rotating the graphite nanoparticle around the normal direction, the external load and the sliding speed. The friction is low in all the investigated cases, the friction coefficients ~ 0.004 to 0.066. The sliding speed slightly results in the friction, while the other factors significantly influence it.
{"title":"Friction between Iron and Partially Frozen Graphite Nanoparticles","authors":"Le Van Sang","doi":"10.2474/trol.18.444","DOIUrl":"https://doi.org/10.2474/trol.18.444","url":null,"abstract":"This study uses the molecular dynamics simulations to investigate the friction between the iron plate sliding against the partially frozen graphite nanoparticle. The graphite nanoparticle is divided into the two parts along the normal direction: the part contacts to the iron plate is controlled temperature and the lower other is held in the frozen situation. We detect the friction dependent on the frozen height, the angle between the sliding direction and the graphene surfaces by rotating the graphite nanoparticle around the normal direction, the external load and the sliding speed. The friction is low in all the investigated cases, the friction coefficients ~ 0.004 to 0.066. The sliding speed slightly results in the friction, while the other factors significantly influence it.","PeriodicalId":23314,"journal":{"name":"Tribology Online","volume":"17 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136227634","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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