Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298053
{"title":"ELECTRONIC SKIN BASED ON TRIBOELECTRIFICATION AND ELECTROSTATIC INDUCTION","authors":"","doi":"10.21608/jest.2023.298053","DOIUrl":"https://doi.org/10.21608/jest.2023.298053","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122326161","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298051
{"title":"ELECTROSTATIC CHARGE GENERATED FROM THE CONTACT-SEPARATION AND SLIDING OF POLYAMIDE AND POLYESTER STRINGS BLENDED BY CARBON FIBERS ON COTTON","authors":"","doi":"10.21608/jest.2023.298051","DOIUrl":"https://doi.org/10.21608/jest.2023.298051","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126607642","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298043
{"title":"ENHANCING THE PERFORMANCE AND COMFORT OF POLYMERIC TEXTILES","authors":"","doi":"10.21608/jest.2023.298043","DOIUrl":"https://doi.org/10.21608/jest.2023.298043","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130643510","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298031
{"title":"TRIBOELECTRIC NANOGENERATOR BASED ON TRIBOELECTRIFICATION AND MAGNETIC FIELD","authors":"","doi":"10.21608/jest.2023.298031","DOIUrl":"https://doi.org/10.21608/jest.2023.298031","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125140915","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298041
{"title":"INFLUENCE OF NANO-ZIRCONIA ADDITION ON THE MECHANICAL PROPERTIES OF AL-7075 REINFORCED BY NANO-BORON CARBIDE AND ALUMINUM DIOXIDE","authors":"","doi":"10.21608/jest.2023.298041","DOIUrl":"https://doi.org/10.21608/jest.2023.298041","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122216665","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298049
{"title":"PROPER MATERIAL SELECTION FOR A TRIBOELECTRIC NANOGENERATOR","authors":"","doi":"10.21608/jest.2023.298049","DOIUrl":"https://doi.org/10.21608/jest.2023.298049","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124993979","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}
Pub Date : 2023-04-01DOI: 10.21608/jest.2023.298035
{"title":"PERFORMANCE OF TRIBOELECTRIC NANOGENERATOR ENHANCED BY ELECTROSTATIC INDUCTION","authors":"","doi":"10.21608/jest.2023.298035","DOIUrl":"https://doi.org/10.21608/jest.2023.298035","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129779093","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}
Pub Date : 2023-01-01DOI: 10.21608/jest.2023.284025
K. Hamdy
Bearing materials must withstand the extremely hard operations affairs through unique tribological and mechanical properties. Various types of polymers exhibit acceptable solutions as bearing materials because of their high weight ratio and self-lubrication materials. In the current work, tribological properties of bearing material high-density polyethylene (HDPE) reinforced by 0.1 aluminium oxide (Al 2 O 3 ) nanoparticles and 0.1– 0.5 wt. % single wall carbon nanotubes ( SWCNTs) were investigated in order to enhance the tribological and mechanical properties The Nano-composite specimens were prepared in cylindrical shape and they were subjected to friction and wear tests using pin on disc tribometer. The specimens were tested as counterparts and the disk was made from stainless steel. Wear tests were done each exactly 120 sec., and the weight losses calculated by weighing the specimens before and after the test. It is noticed that the HDPE nano-composite specimen with additives of SWCNTs 0.5 wt. % gives the specific optimum tribological properties and the coefficient of friction was reduced by 30% in comparing with pure HDPE material.
{"title":"WEAR OF HIGH DENSITY POLYETHYLENE REINFORCED BY SINGLE WALL CARBON NANOTUBES AND ALUMINIUM OXIDE NANOPARTICLES FOR BEARING MATERIALS APPLICATIONS","authors":"K. Hamdy","doi":"10.21608/jest.2023.284025","DOIUrl":"https://doi.org/10.21608/jest.2023.284025","url":null,"abstract":"Bearing materials must withstand the extremely hard operations affairs through unique tribological and mechanical properties. Various types of polymers exhibit acceptable solutions as bearing materials because of their high weight ratio and self-lubrication materials. In the current work, tribological properties of bearing material high-density polyethylene (HDPE) reinforced by 0.1 aluminium oxide (Al 2 O 3 ) nanoparticles and 0.1– 0.5 wt. % single wall carbon nanotubes ( SWCNTs) were investigated in order to enhance the tribological and mechanical properties The Nano-composite specimens were prepared in cylindrical shape and they were subjected to friction and wear tests using pin on disc tribometer. The specimens were tested as counterparts and the disk was made from stainless steel. Wear tests were done each exactly 120 sec., and the weight losses calculated by weighing the specimens before and after the test. It is noticed that the HDPE nano-composite specimen with additives of SWCNTs 0.5 wt. % gives the specific optimum tribological properties and the coefficient of friction was reduced by 30% in comparing with pure HDPE material.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114837288","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}
Pub Date : 2023-01-01DOI: 10.21608/jest.2023.284014
Graphene oxide (GO) is favored as a filler material in polymer matrix composites because it has higher aspect ratios than many nanosize fillers, such as carbon nanotubes, in addition to having better mechanical qualities than many polymers. In this study, the tribological properties of high density polyethylene (HDPE) were experimentally studied in relation to the effects of GO nanoparticles and vegetables oils. By using the melt compounding process, the nanocomposites (HDPE – GO - vegetables oils) were manufactured. The molded nanocomposite were then tested for friction and wear tests. According to the findings, the addition of GO improved the friction and wear behavior of the composites. With GO loading fractions of 0, 0.06, 0.12, 0.25, 0.5, and 1.0 wt. %, the wear and coefficient of friction values were drastically reduced. The corn and olive oils were added by 10 wt. % to the composites.
{"title":"TRIBOLOGICAL PROPERTIES OF HIGH DENSITY POLYETHYLENE FILLED BY GRAPHENE OXIDE NANO PARTICLES","authors":"","doi":"10.21608/jest.2023.284014","DOIUrl":"https://doi.org/10.21608/jest.2023.284014","url":null,"abstract":"Graphene oxide (GO) is favored as a filler material in polymer matrix composites because it has higher aspect ratios than many nanosize fillers, such as carbon nanotubes, in addition to having better mechanical qualities than many polymers. In this study, the tribological properties of high density polyethylene (HDPE) were experimentally studied in relation to the effects of GO nanoparticles and vegetables oils. By using the melt compounding process, the nanocomposites (HDPE – GO - vegetables oils) were manufactured. The molded nanocomposite were then tested for friction and wear tests. According to the findings, the addition of GO improved the friction and wear behavior of the composites. With GO loading fractions of 0, 0.06, 0.12, 0.25, 0.5, and 1.0 wt. %, the wear and coefficient of friction values were drastically reduced. The corn and olive oils were added by 10 wt. % to the composites.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116396552","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}
Pub Date : 2023-01-01DOI: 10.21608/jest.2023.284023
Ahmed A. Gad El-Mawla
Defects in bearings may arise during use or during the manufacturing process such as crack damage, spalling, corrosion, fatigue failure, etc. The detection of the defects is important for condition monitoring as well as quality inspection of bearings. Vibration analysis is the most common method used in monitoring applications since a local defect produces successive impulses at every contact of defect. The aim of this paper is to focus on investigating the position of the local defect on the outer race is changed 0˚, 45˚ and 180˚. The different angular defect position is studied at zero clearance, ε = 0.5, by using the statistical parameters RMS. It can be concluded that the acceleration RMS ratio is more effective in detecting the defect for acceleration response.
{"title":"CONDITION MONITORING OF LOCALIZED OUTER RACE DEFECTS OF TAPER ROLLER BEARINGS USING VIBRATION ANALYSIS","authors":"Ahmed A. Gad El-Mawla","doi":"10.21608/jest.2023.284023","DOIUrl":"https://doi.org/10.21608/jest.2023.284023","url":null,"abstract":"Defects in bearings may arise during use or during the manufacturing process such as crack damage, spalling, corrosion, fatigue failure, etc. The detection of the defects is important for condition monitoring as well as quality inspection of bearings. Vibration analysis is the most common method used in monitoring applications since a local defect produces successive impulses at every contact of defect. The aim of this paper is to focus on investigating the position of the local defect on the outer race is changed 0˚, 45˚ and 180˚. The different angular defect position is studied at zero clearance, ε = 0.5, by using the statistical parameters RMS. It can be concluded that the acceleration RMS ratio is more effective in detecting the defect for acceleration response.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116754806","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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