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Validity of Amontons’ law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers
Friction ( IF 6.8 ) Pub Date : 2019-10-15 , DOI: 10.1007/s40544-019-0311-5
M. Khafidh , D. J. Schipper , M. A. Masen , N. Vleugels , W. K. Dierkes , J. W. M. Noordermeer

Friction between two contacting surfaces is studied extensively. One of the known friction theories is Amontons’ law which states that the friction force is proportional to the normal force. However, Amontons’ law has been found to be invalid for elastomers. In the present study, the validity of Amontons’ law for short-cut aramid fiber reinforced elastomers is studied. Two types of fillers are used to reinforce the elastomers, namely highly dispersible silica and short-cut aramid fibers. Short-cut aramid fibers with two different surface treatments are used, namely non-reactive fibers with standard oily finish (SF-fibers) and fibers treated with an epoxy coating (EF-fibers). A pin-on-disc tribometer is used to investigate the frictional behavior of the composites in sliding contact with a granite counter surface. The results show that, after the run-in phase, Amontons’ law is valid for those composites that are reinforced by short-cut aramid fibers (without reinforcing filler, i.e., silica) if the contact pressure is below a threshold value. However, once the contact pressure exceeds this threshold value, Amontons’ law will be invalid. The threshold contact pressure of the composites containing EF-fibers is higher than of the composites containing SF-fibers. The composites that are reinforced by silica and short-cut aramid fibers do not follow Amontons’ law.

中文翻译:

阿蒙顿定律对磨合短切芳纶纤维增强弹性体的有效性:环氧涂层纤维的影响

广泛研究了两个接触表面之间的摩擦。已知的摩擦理论之一是阿蒙顿定律,该定律指出摩擦力与法向力成比例。但是,已经发现阿蒙顿定律对弹性体无效。在本研究中,研究了短切芳纶纤维增强弹性体的阿蒙顿定律的有效性。两种类型的填料用于增强弹性体,即高分散性二氧化硅和短切芳纶纤维。使用具有两种不同表面处理的短切芳纶纤维,即具有标准油性表面处理的非反应性纤维(SF纤维)和经环氧涂层处理的纤维(EF纤维)。圆盘摩擦计用于研究与花岗岩反面滑动接触的复合材料的摩擦性能。结果表明,在磨合阶段之后,如果接触压力低于阈值,则阿蒙顿定律对那些由短芳纶纤维(不含增强填料,即二氧化硅)增强的复合材料有效。但是,一旦接触压力超过该阈值,则阿蒙顿定律将失效。包含EF-纤维的复合材料的阈值接触压力高于包含SF-纤维的复合材料的阈值接触压力。由二氧化硅和短芳纶纤维增强的复合材料不符合阿蒙顿定律。包含EF-纤维的复合材料的阈值接触压力高于包含SF-纤维的复合材料的阈值接触压力。由二氧化硅和短芳纶纤维增强的复合材料不符合阿蒙顿定律。包含EF-纤维的复合材料的阈值接触压力高于包含SF-纤维的复合材料的阈值接触压力。由二氧化硅和短芳纶纤维增强的复合材料不符合阿蒙顿定律。
更新日期:2019-10-15
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