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首页> 外文期刊>The European physical journal, E. Soft matter >Rubber friction on smooth surfaces
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Rubber friction on smooth surfaces

机译：橡胶在光滑表面上的摩擦

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We study the sliding friction for viscoelastic solids, e.g., rubber, on hard flat substrate surfaces. We consider first the fluctuating shear stress inside a viscoelastic solid which results from the thermal motion of the atoms or molecules in the solid. At the nanoscale the thermal fluctuations are very strong and give rise to stress fluctuations in the MPa-range, which is similar to the depinning stresses which typically occur at solid-rubber interfaces, indicating the crucial importance of thermal fluctuations for rubber friction on smooth surfaces. We develop a detailed model which takes into account the influence of thermal fluctuations on the depinning of small contact patches (stress domains) at the rubber-substrate interface. The theory predicts that the velocity dependence of the macroscopic shear stress has a bell-shaped form, and that the low-velocity side exhibits the same temperature dependence as the bulk viscoelastic modulus, in qualitative agreement with experimental data. Finally, we discuss the influence of small-amplitude substrate roughness on rubber sliding friction.
机译：我们研究了粘弹性固体（例如橡胶）在坚硬的平坦基材表面上的滑动摩擦。我们首先考虑由固体中原子或分子的热运动引起的粘弹性固体内部的波动剪切应力。在纳米级，热波动非常强烈，并导致在MPa范围内的应力波动，这与固体橡胶界面通常发生的拔钉应力相似，这表明热波动对于光滑表面上的橡胶摩擦至关重要。 。我们开发了一个详细的模型，该模型考虑了热涨落对橡胶-基底界面处小接触斑块（应力域）的钉扎作用的影响。该理论预测宏观剪切应力的速度相关性呈钟形，低速侧与体粘弹性模量表现出相同的温度相关性，与实验数据定性一致。最后，我们讨论了小振幅基底粗糙度对橡胶滑动摩擦的影响。

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