Stick-slip: Wet versus dry

被引：0

作者：

Wu-Bavouzet, F. ^{[1
]}

Clain-Burckbuchler, J. ^{[1
]}

Buguin, A. ^{[1
]}

De Gennes, P.-G. ^{[1
]}

Brochard-Wyart, F. ^{[1
]}

机构：

[1] Institut Curie, Centre de Recherche, Université Paris 6, F75248 Paris, France

来源：

Journal of Adhesion | 2007年 / 83卷 / 08期

关键词：

A rubber lens (polydimethylsiloxane) is pressed against silanated or bare glass plates (Johnson-Kendall-Roberts (JKR) contact). As the plate slides with a velocity U; we measure the friction on the lens using a macro Atomic Force Microscope (AFM); where the cantilever is a thin rectangular glass rod and the tip is the rubber lens. We observe the contact area via optical interferometry. In air for hard lenses (Young's modulus E ' MPa); we find smooth sliding on a model substrate; and a transition to stick-slip on a hysteretic substrate above a threshold velocity; VM. For soft lenses (E 1MPa); we observe Schallamach waves and stick-slip depending on normal force and the plate's velocity; U. When immersed in a liquid (silicone oils; water-glycerol mixtures); the contact remains dry at low velocities; but is invaded by a liquid film above a critical velocity; Uc. For hard lenses we observe smooth sliding and high friction below Uc; and low friction above Uc. For soft lenses; we find wet Schallamach waves for U M and stick-slip instabilities at large velocities. In the stick-slip regime; the contact is wet in the slip phase; and dewets in the stick phase. We measure the period of the stick-slip cycle as a function of the liquid viscosity. We interpret the stick-slip process by the formation and rupture of adhesive bonds (between the rubber polymer chains and active sites on the glass). Using a recent model; we can explain most of the data for the stick-slip period and slip threshold velocity;

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摘要：

Journal article (JA)

引用

页码：761 / 784