Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2
Coefficient of friction values, wear and surface roughness differences are revealed using pin-on-disc test apparatus examinations under three <i>pv</i> loads, where samples are cut from a reference, unused, and several differently aged and dimensioned, used, dry friction fiber-reinforced...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/9/1757 |
| _version_ | 1797503212405653504 |
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| author | Roland Biczó Gábor Kalácska |
| author_facet | Roland Biczó Gábor Kalácska |
| author_sort | Roland Biczó |
| collection | DOAJ |
| description | Coefficient of friction values, wear and surface roughness differences are revealed using pin-on-disc test apparatus examinations under three <i>pv</i> loads, where samples are cut from a reference, unused, and several differently aged and dimensioned, used, dry friction fiber-reinforced hybrid composite clutch facings. Tests are characterized by surface activation energy and separated into Trend 1, ‘clutch killer’, and 2, ‘moderate’, groups from our previous study. The results reveal that acceptable, 0.41–0.58, coefficient of friction values among Trend 1 specimens cannot be reached during high <i>pv</i> tests, though the −0.19–−0.11 difference of minimum and maximum <i>pv</i> results disappears when activation energy reaches 179 MJ. The maximum <i>pv</i> friction coefficient can decrease by up to 30% at working diameter due to clutch killer test circumstances, as 179 MJ surface activation energy is applied, while by moderate tests such losses can only be detected close to 2000 MJ energy values among small-sized facings. Besides that, Trend 2 specific wear values are the third of trend 1 results at inner diameter specimens. Compared to reference facing values, specific wear results at working diameter under maximum <i>pv</i> decrease by 47–100%, while increasing specific wear during lifetime can only be detected at the inner diameter of facings enduring clutch killer tests or that are small-sized facings. Among Trend 1 radial and tangential Ra delta results, inner diameter samples provide more decreasing surface roughness data, while by Trend 2 values, the opposite relation is detected. Apart from the effects of activation energy, mileage and driver profile, facing size and friction diameter influence is also revealed. |
| first_indexed | 2024-03-10T03:47:19Z |
| format | Article |
| id | doaj.art-df06f1a12eda4bec90696d2b8d572ddf |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:47:19Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-df06f1a12eda4bec90696d2b8d572ddf2023-11-23T09:05:48ZengMDPI AGPolymers2073-43602022-04-01149175710.3390/polym14091757Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2Roland Biczó0Gábor Kalácska1Institute of Technology, Szent István Campus, MATE, Páter Károly u. 1., H-2100 Gödöllő, HungaryInstitute of Technology, Szent István Campus, MATE, Páter Károly u. 1., H-2100 Gödöllő, HungaryCoefficient of friction values, wear and surface roughness differences are revealed using pin-on-disc test apparatus examinations under three <i>pv</i> loads, where samples are cut from a reference, unused, and several differently aged and dimensioned, used, dry friction fiber-reinforced hybrid composite clutch facings. Tests are characterized by surface activation energy and separated into Trend 1, ‘clutch killer’, and 2, ‘moderate’, groups from our previous study. The results reveal that acceptable, 0.41–0.58, coefficient of friction values among Trend 1 specimens cannot be reached during high <i>pv</i> tests, though the −0.19–−0.11 difference of minimum and maximum <i>pv</i> results disappears when activation energy reaches 179 MJ. The maximum <i>pv</i> friction coefficient can decrease by up to 30% at working diameter due to clutch killer test circumstances, as 179 MJ surface activation energy is applied, while by moderate tests such losses can only be detected close to 2000 MJ energy values among small-sized facings. Besides that, Trend 2 specific wear values are the third of trend 1 results at inner diameter specimens. Compared to reference facing values, specific wear results at working diameter under maximum <i>pv</i> decrease by 47–100%, while increasing specific wear during lifetime can only be detected at the inner diameter of facings enduring clutch killer tests or that are small-sized facings. Among Trend 1 radial and tangential Ra delta results, inner diameter samples provide more decreasing surface roughness data, while by Trend 2 values, the opposite relation is detected. Apart from the effects of activation energy, mileage and driver profile, facing size and friction diameter influence is also revealed.https://www.mdpi.com/2073-4360/14/9/1757dry frictionhybrid compositepin-on-disccoefficient of frictionsurface roughnesswear |
| spellingShingle | Roland Biczó Gábor Kalácska Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 Polymers dry friction hybrid composite pin-on-disc coefficient of friction surface roughness wear |
| title | Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 |
| title_full | Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 |
| title_fullStr | Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 |
| title_full_unstemmed | Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 |
| title_short | Effects of Automotive Test Parameters on Dry Friction Fiber-Reinforced Clutch Facing Surface Microgeometry and Wear—Part 2 |
| title_sort | effects of automotive test parameters on dry friction fiber reinforced clutch facing surface microgeometry and wear part 2 |
| topic | dry friction hybrid composite pin-on-disc coefficient of friction surface roughness wear |
| url | https://www.mdpi.com/2073-4360/14/9/1757 |
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