Effects of stretching on the frictional stress of rubber,Soft Matter

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Effects of stretching on the frictional stress of rubber
Soft Matter ( IF 2.9 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1039/c7sm01092c
A. Chateauminois _{1,

2,

3,

4,

5} , D. T. Nguyen _{1,

2,

3,

4,

5} , C. Frétigny _{1,

2,

3,

4,

5}

Affiliation

In this paper, we report on new experimental results on the effects of in-plane surface stretching on the friction of poly(dimethylsiloxane) (PDMS) rubber with smooth rigid probes. Friction-induced displacement fields are measured at the surface of the PDMS substrate under steady-state sliding. Then, the corresponding contact pressure and frictional stress distributions are determined from an inversion procedure. Using this approach, we show that the local frictional stress τ is proportional to the local stretch ratio λ at the rubber surface. Additional data using a triangular flat punch indicate that τ(λ) relationship is independent on the contact geometry. From friction experiments using pre-stretched PDMS substrate, it is also found that the stretch-dependence of the frictional stress is isotropic, i.e. it does not depend on the angle between stretching and sliding directions. Potential physical explanations for this phenomenon are provided within the framework of Schallamach's friction model. Although the present experiments are dealing with smooth contact interfaces, the reported τ(λ) dependence is also relevant to the friction of statistically rough contact interfaces, while not accounted for in related contact mechanics models.

中文翻译：

拉伸对橡胶摩擦应力的影响

在本文中，我们报告了使用光滑的刚性探针进行的平面内表面拉伸对聚二甲基硅氧烷（PDMS）橡胶摩擦的影响的新实验结果。在稳态滑动下，在PDMS基板的表面测量摩擦引起的位移场。然后，根据反演程序确定相应的接触压力和摩擦应力分布。使用这种方法，我们显示出局部摩擦应力τ与橡胶表面的局部拉伸比λ成正比。使用三角形平冲头的附加数据表明τ（λ）关系与接触几何形状无关。从使用预拉伸的PDMS基板进行的摩擦实验中，还发现摩擦应力的拉伸相关性是各向同性的，即，它不取决于拉伸方向和滑动方向之间的角度。在Schallamach摩擦模型的框架内提供了对此现象的潜在物理解释。尽管目前的实验是在处理光滑的接触界面，但所报告的τ（λ）依赖性也与统计上粗糙的接触界面的摩擦有关，而未在相关的接触力学模型中进行解释。

更新日期：2017-09-13

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