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| 001 | 860473 | ||
| 005 | 20210130000522.0 | ||
| 024 | 7 | _ | |a 10.1063/1.5037136 |2 doi |
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| 100 | 1 | _ | |a Tiwari, A. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Rubber friction: The contribution from the area of real contact |
| 260 | _ | _ | |a Melville, NY |c 2018 |b American Institute of Physics |
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| 520 | _ | _ | |a There are two contributions to the friction force when a rubber block is sliding on a hard and rough substrate surface, namely, a contribution Fad = τf A from the area of real contact A and a viscoelastic contribution Fvisc from the pulsating forces exerted by the substrate asperities on the rubber block. Here we present experimental results obtained at different sliding speeds and temperatures, and we show that the temperature dependency of the shear stress τf, for temperatures above the rubber glass transition temperature Tg, is weaker than that of the bulk viscoelastic modulus. The physical origin of τf for T > Tg is discussed, and we propose that its temperature dependency is determined by the rubber molecule segment mobility at the sliding interface, which is higher than in the bulk because of increased free-volume effect due to the short-wavelength surface roughness. This is consistent with the often observed reduction in the glass transition temperature in nanometer-thick surface layers of glassy polymers. For temperatures T < Tg, the shear stress τf is nearly velocity independent and of similar magnitude as observed for glassy polymers such as PMMA or polyethylene. In this case, the rubber undergoes plastic deformations in the asperity contact regions and the contact area is determined by the rubber penetration hardness. For this case, we propose that the frictional shear stress is due to slip at the interface between the rubber and a transfer film adsorbed on the concrete surface |
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| 700 | 1 | _ | |a Miyashita, N. |0 P:(DE-HGF)0 |b 1 |
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| 700 | 1 | _ | |a Persson, Bo |0 P:(DE-Juel1)130885 |b 3 |u fzj |
| 773 | _ | _ | |a 10.1063/1.5037136 |g Vol. 148, no. 22, p. 224701 - |0 PERI:(DE-600)1473050-9 |n 22 |p 224701 |t The journal of chemical physics |v 148 |y 2018 |x 1089-7690 |
| 856 | 4 | _ | |y Published on 2018-06-12. Available in OpenAccess from 2019-06-12. |u https://juser.fz-juelich.de/record/860473/files/1.5037136.pdf |
| 856 | 4 | _ | |y Published on 2018-06-12. Available in OpenAccess from 2019-06-12. |x pdfa |u https://juser.fz-juelich.de/record/860473/files/1.5037136.pdf?subformat=pdfa |
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