Validity of Amontons' law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers

M. Khafidh, D. J. Schipper, M. A. Masen, N. Vleugels, W. K. Dierkes, J. W. M. Noordermeer

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Abstract

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.
Original languageEnglish
Number of pages13
JournalFriction
Early online date15 Oct 2019
DOIs
Publication statusPublished - 15 Oct 2019

Keywords

  • Amontons' law
  • elastomer
  • epoxy coated fiber
  • short-cut aramid fiber

Cite this

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title = "Validity of Amontons' law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers",
abstract = "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.",
keywords = "Amontons' law, elastomer, epoxy coated fiber, short-cut aramid fiber",
author = "M. Khafidh and Schipper, {D. J.} and Masen, {M. A.} and N. Vleugels and Dierkes, {W. K.} and Noordermeer, {J. W. M.}",
year = "2019",
month = "10",
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doi = "10.1007/s40544-019-0311-5",
language = "English",
journal = "Friction",
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Validity of Amontons' law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers. / Khafidh, M.; Schipper, D. J.; Masen, M. A.; Vleugels, N.; Dierkes, W. K.; Noordermeer, J. W. M.

In: Friction, 15.10.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Validity of Amontons' law for run-in short-cut aramid fiber reinforced elastomers: The effect of epoxy coated fibers

AU - Khafidh, M.

AU - Schipper, D. J.

AU - Masen, M. A.

AU - Vleugels, N.

AU - Dierkes, W. K.

AU - Noordermeer, J. W. M.

PY - 2019/10/15

Y1 - 2019/10/15

N2 - 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.

AB - 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.

KW - Amontons' law

KW - elastomer

KW - epoxy coated fiber

KW - short-cut aramid fiber

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