Pub Date : 2022-10-01DOI: 10.21608/jest.2022.266535
The quality of clothes depends on the comfort of textiles. The measure of the comfort is the friction displayed by the sliding of the textiles on skin or other textiles as well as the generation of electrostatic charge (ESC). As the friction increased, the comfort of the clothes decreased. The present work discusses the friction and ESC generated from the contact and separation as well as sliding of polymeric textiles on cotton. Test specimens of composites containing polyester (PET) and polyamide (PA) textile fibers were prepared and tested by contact and separation as well as sliding under different loads against cotton textiles. Ultra surface DC Voltmeter was used to measure ESC of the tested textile composites. It was found that friction coefficient displayed by the sliding of the PET/PA blend strings on cotton textile drastically decreased with increasing PA. At contact and separation with cotton, ESC generated on the surface of the tested blend showed the highest negative values at 100 % PET, then decreased with increasing PA content. While, the positive ESC generated on the surface of the cotton recorded zero value at 80 % PA, then decreased with increasing PA content to record negative values. Sliding displayed relatively higher ESC at 100 % PA than that observed in contact and separation. The zero values of ESC were observed at 93 % PA. ESC generated on the cotton counterface recorded higher values at 100 % PET. As PA content increased, ESC drastically decreased to negative charge at 100 % PA.
{"title":"REDUCING THE ELECTROSTATIC DISCHARGE GENERATED FROM THE CONTACT AND SEPARATION AS WELL AS SLIDING OF POLYMERIC TEXTILES ON COTTON","authors":"","doi":"10.21608/jest.2022.266535","DOIUrl":"https://doi.org/10.21608/jest.2022.266535","url":null,"abstract":"The quality of clothes depends on the comfort of textiles. The measure of the comfort is the friction displayed by the sliding of the textiles on skin or other textiles as well as the generation of electrostatic charge (ESC). As the friction increased, the comfort of the clothes decreased. The present work discusses the friction and ESC generated from the contact and separation as well as sliding of polymeric textiles on cotton. Test specimens of composites containing polyester (PET) and polyamide (PA) textile fibers were prepared and tested by contact and separation as well as sliding under different loads against cotton textiles. Ultra surface DC Voltmeter was used to measure ESC of the tested textile composites. It was found that friction coefficient displayed by the sliding of the PET/PA blend strings on cotton textile drastically decreased with increasing PA. At contact and separation with cotton, ESC generated on the surface of the tested blend showed the highest negative values at 100 % PET, then decreased with increasing PA content. While, the positive ESC generated on the surface of the cotton recorded zero value at 80 % PA, then decreased with increasing PA content to record negative values. Sliding displayed relatively higher ESC at 100 % PA than that observed in contact and separation. The zero values of ESC were observed at 93 % PA. ESC generated on the cotton counterface recorded higher values at 100 % PET. As PA content increased, ESC drastically decreased to negative charge at 100 % PA.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134345334","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 : 2022-07-01DOI: 10.21608/jest.2022.249532
{"title":"Triboelectrification of Carbon Fiber Reinforced Epoxy Composites","authors":"","doi":"10.21608/jest.2022.249532","DOIUrl":"https://doi.org/10.21608/jest.2022.249532","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124187626","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 : 2022-07-01DOI: 10.21608/jest.2022.249529
{"title":"EFFECT OF THE CONTACT FORCE ON VOLTAGE OUTPUT OF A TRIBOELECTRIC NANOGENERATOR","authors":"","doi":"10.21608/jest.2022.249529","DOIUrl":"https://doi.org/10.21608/jest.2022.249529","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122374139","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 : 2022-07-01DOI: 10.21608/jest.2022.249536
{"title":"Vibration of 2D FG Higher Order Plates using Differential Integral Quadrature Method","authors":"","doi":"10.21608/jest.2022.249536","DOIUrl":"https://doi.org/10.21608/jest.2022.249536","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123105263","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 : 2022-07-01DOI: 10.21608/jest.2022.249533
Ameer, Al-Kabbany
Triboelectric nanogenerators (TENG) are becoming increasingly popular due to their wide range of uses, ranging from self-powered sensors to energy harvesters, they are devices that make use of the triboelectric effect in order to convert mechanical energy into electric energy. However, in order for them to be as effective as possible, complicated surface geometries are often used. The present study investigates a cheap method of obtaining desirable surfaces for use in TENG, using commercial emery paper to roughen one of their two surfaces. It was found that increasing the grit and thus decreasing the particle size of the emery paper used in roughening the surface increased the output open circuit voltage of the triboelectric nanogenerator. It is concluded that emery paper works as a cheap method of roughening one of the two surfaces of a TENG, and increasing the number of contacting asperities leading to the increase of electrostatic charge. It was found that as the value of the applied load increases, the output voltage increases, due to the increase of the actual contact area of the TENG.
{"title":"INFLUENCE OF SURFACE ROUGHNESS ON THE OUTPUT VOLTAGE OF A TRIBOELECTRIC NANOGENERATOR","authors":"Ameer, Al-Kabbany","doi":"10.21608/jest.2022.249533","DOIUrl":"https://doi.org/10.21608/jest.2022.249533","url":null,"abstract":"Triboelectric nanogenerators (TENG) are becoming increasingly popular due to their wide range of uses, ranging from self-powered sensors to energy harvesters, they are devices that make use of the triboelectric effect in order to convert mechanical energy into electric energy. However, in order for them to be as effective as possible, complicated surface geometries are often used. The present study investigates a cheap method of obtaining desirable surfaces for use in TENG, using commercial emery paper to roughen one of their two surfaces. It was found that increasing the grit and thus decreasing the particle size of the emery paper used in roughening the surface increased the output open circuit voltage of the triboelectric nanogenerator. It is concluded that emery paper works as a cheap method of roughening one of the two surfaces of a TENG, and increasing the number of contacting asperities leading to the increase of electrostatic charge. It was found that as the value of the applied load increases, the output voltage increases, due to the increase of the actual contact area of the TENG.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121565107","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 : 2022-07-01DOI: 10.21608/jest.2022.249531
{"title":"DESIGN AND NUMERICAL ANALYSIS OF VERTICAL AXIS WIND TURBINE FOR ENERGY HARVESTING FROM HIGH-WAY VEHICLES MOTION","authors":"","doi":"10.21608/jest.2022.249531","DOIUrl":"https://doi.org/10.21608/jest.2022.249531","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131837896","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 : 2022-07-01DOI: 10.21608/jest.2022.249534
Touny
The antiwear properties of hydraulic oils containing zinc dialkyl dithiophosphates are discussed. The tested additives are added to hydraulic oil at different concentrations. Tests were carried out to investigate the friction and wear of steel lubricated by these additives using pin on disc wear tester. The experiments of the present work reveals that friction coefficient significantly increased as the applied load increased. Addition of the additive into hydraulic oil decreased friction coefficient, where the lowest friction values were observed at 1.0 wt. % of the additive content. The same trend was observed when the test specimens were lubricated by relatively high viscosity hydraulic oil. Besides, wear decreased with increasing additive content. The lowest values were measured for the 1.0 wt. % additive content. The viscosity improver decreased the values of wear. The decrease of friction and wear can be attributed to the decomposition products of the additive that work as solid lubricants. While increasing the viscosity enabled the oil to form relatively thicker oil film between the sliding surfaces.
{"title":"TRIBOLOGICAL PERFORMANCE OF ANTIWEAR ADDITIVE DISPERSED IN HYDRAULIC OIL","authors":"Touny","doi":"10.21608/jest.2022.249534","DOIUrl":"https://doi.org/10.21608/jest.2022.249534","url":null,"abstract":"The antiwear properties of hydraulic oils containing zinc dialkyl dithiophosphates are discussed. The tested additives are added to hydraulic oil at different concentrations. Tests were carried out to investigate the friction and wear of steel lubricated by these additives using pin on disc wear tester. The experiments of the present work reveals that friction coefficient significantly increased as the applied load increased. Addition of the additive into hydraulic oil decreased friction coefficient, where the lowest friction values were observed at 1.0 wt. % of the additive content. The same trend was observed when the test specimens were lubricated by relatively high viscosity hydraulic oil. Besides, wear decreased with increasing additive content. The lowest values were measured for the 1.0 wt. % additive content. The viscosity improver decreased the values of wear. The decrease of friction and wear can be attributed to the decomposition products of the additive that work as solid lubricants. While increasing the viscosity enabled the oil to form relatively thicker oil film between the sliding surfaces.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131387503","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 : 2022-07-01DOI: 10.21608/jest.2022.249535
{"title":"INVESTIGATION OF THE INFLUENCE OF ANTIWEAR ADDITIVES DISPERSED IN HYDRAULIC OIL ON FRICTION AND WEAR","authors":"","doi":"10.21608/jest.2022.249535","DOIUrl":"https://doi.org/10.21608/jest.2022.249535","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120959373","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 : 2022-07-01DOI: 10.21608/jest.2022.249530
{"title":"VOLTAGE GENERATED FROM TRIBOELECTRIFICATION OF RABBIT FUR AND POLYMERIC MATERIALS","authors":"","doi":"10.21608/jest.2022.249530","DOIUrl":"https://doi.org/10.21608/jest.2022.249530","url":null,"abstract":"","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129595531","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 : 2022-04-01DOI: 10.21608/jest.2022.231178
Badran
Due to the PMMA resin has a widespread in dental restorations, the current study focused on assessing the tribological properties of the composite filled with nano-filling. The hybrid nano-filler used in this research is graphene and TiO 2 nanoparticles. Loading filler amount of TiO 2 nanoparticles 0.25, 0.5, and 0.75 wt. %, while graphene adds with amount of 0.5 and 1.0wt. %. The reciprocating tribometer was used to perform the tribological properties of the composites. Moreover, the hardness was evaluated via durometer Shore D. It was found that a good enhancement in the mechanical and tribological properties of PMMA composites. According to experimental results, it can conclude that, PMMA nanocomposites with filler content of 1.0 wt. % of graphene and 0.25 wt. % TiO 2 nanoparticles recorded the best wear resistance performance comparing with pure specimen.
{"title":"HARDNESS AND TRIBOLOGICAL PROPERTIES OF PMMA COMPOSITE REINFORCED BY HYBRID GRAPHENE AND TiO2 NANOPARTICLES USED IN DENTAL APPLICATIONS","authors":"Badran","doi":"10.21608/jest.2022.231178","DOIUrl":"https://doi.org/10.21608/jest.2022.231178","url":null,"abstract":"Due to the PMMA resin has a widespread in dental restorations, the current study focused on assessing the tribological properties of the composite filled with nano-filling. The hybrid nano-filler used in this research is graphene and TiO 2 nanoparticles. Loading filler amount of TiO 2 nanoparticles 0.25, 0.5, and 0.75 wt. %, while graphene adds with amount of 0.5 and 1.0wt. %. The reciprocating tribometer was used to perform the tribological properties of the composites. Moreover, the hardness was evaluated via durometer Shore D. It was found that a good enhancement in the mechanical and tribological properties of PMMA composites. According to experimental results, it can conclude that, PMMA nanocomposites with filler content of 1.0 wt. % of graphene and 0.25 wt. % TiO 2 nanoparticles recorded the best wear resistance performance comparing with pure specimen.","PeriodicalId":212154,"journal":{"name":"Journal of the Egyptian Society of Tribology","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117270464","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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