Local friction at a sliding interface between an elastomer and a rigid spherical probe
Local friction at a sliding interface between an elastomer and a rigid spherical probe
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DOI：
10.1140/epje/i2008-10376-5
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发表时间：
2008-10-01
影响因子：
1.8
通讯作者：
Fretigny, C.
中科院分区：
文献类型：
--
作者：
Chateauminois, A.;Fretigny, C.
本文报道了平面橡胶基底与玻璃透镜摩擦界面处剪切应力分布的空间分辨测量。为了测量球形探针稳态摩擦引起的表面位移场，制备了靠近其表面由彩色图案标记的硅橡胶试样。然后，该位移场的解卷积提供接触界面处的实际剪应力分布。当使用光滑的玻璃透镜时，在触点内获得几乎恒定的剪切应力。另一方面，粗糙透镜获得了钟形剪应力分布。这些第一个结果表明，简单的概念，真实的接触面积和恒定的界面剪应力不能解释所观察到的变化时，粗糙度变化的局部摩擦。
This paper reports on spatially resolved measurements of the shear stress distribution at a frictional interface between a flat rubber substrate and a glass lens. Silicone rubber specimens marked close to their surface by a colored pattern have been prepared in order to measure the surface displacement field induced by the steady-state friction of the spherical probe. The deconvolution of this displacement field then provides the actual shear stress distribution at the contact interface. When a smooth glass lens is used, a nearly constant shear stress is achieved within the contact. On the other hand, a bell-shaped shear stress distribution is obtained with rough lenses. These first results suggest that simple notions of real contact area and constant interface shear stress cannot account for the observed changes in local friction when roughness is varied.