Biczó Roland, Kalácska Gábor
Institute of Technology, Szent István Campus, MATE, Páter Károly u. 1., H-2100 Gödöllő, Hungary.
Polymers (Basel). 2022 Apr 26;14(9):1757. doi: 10.3390/polym14091757.
Coefficient of friction values, wear and surface roughness differences are revealed using pin-on-disc test apparatus examinations under three 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 tests, though the -0.19--0.11 difference of minimum and maximum results disappears when activation energy reaches 179 MJ. The maximum 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 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.
通过在三种载荷下使用销盘试验装置进行测试，揭示了摩擦系数值、磨损和表面粗糙度差异，其中样品取自一个参考的、未使用过的以及几个不同老化程度和尺寸的、已使用过的干摩擦纤维增强混合复合离合器面片。试验以表面活化能为特征，并根据我们之前的研究分为趋势1（“离合器杀手”）和趋势2（“中等”）两组。结果表明，在高负荷试验期间，趋势1试样无法达到可接受的摩擦系数值（0.41 - 0.58），不过当活化能达到179兆焦时，最小和最大结果之间-0.19至-0.11的差异消失。由于离合器杀手试验条件，当施加179兆焦表面活化能时，工作直径处的最大摩擦系数可降低多达30%，而通过中等试验，只有在小尺寸面片接近2000兆焦能量值时才能检测到这种损失。除此之外，趋势2在内径试样处的比磨损值是趋势1结果的三分之一。与参考面片值相比，最大负荷下工作直径处的比磨损结果降低了47 - 100%，而只有在经受离合器杀手试验的面片内径处或小尺寸面片处，才能检测到使用寿命期间比磨损的增加。在趋势1的径向和切向Ra增量结果中，内径样品提供了更多表面粗糙度降低的数据，而对于趋势2的值，则检测到相反的关系。除了活化能、行驶里程和驾驶员特征的影响外，还揭示了面片尺寸和摩擦直径的影响。
