Natural contacting surfaces have remarkable surface mechanical properties, which has led to the development of bioinspired surface structures using rubbery materials with strongly enhanced adhesion and static fric-tion. However, sliding friction of structured rubbery surfaces is almost always significantly lower than that of a flat control, often due to significant loss of contact. Here we show that a film-terminated ridge-channel structure can strongly enhance sliding friction. We show that with properly chosen materials and geometrical parameters the near surface structure undergoes mechanical instabilities along with complex folding and sliding of internal interfaces, which is responsible for the enhancement of sliding friction. Because this structure shows no enhancement of adhesion under normal indentation by a sphere, it breaks the connection between energy loss during normal and shear loading. This makes it potentially interesting in many applications, for instance in tires, where one wishes to minimize rolling resistance (normal loading) while maximizing sliding friction (shear loading).
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机译：自然接触表面具有显着的表面机械性能，导致使用橡胶状材料的生物悬浮表面结构的开发，具有强大的粘附性和静态纤维。然而，由于显着的接触损失，所结构的橡胶表面的滑动摩擦力几乎总是显着低于平板控制的。在这里，我们表明，封端的脊通道结构可以强烈地增强滑动摩擦。 We show that with properly chosen materials and geometrical parameters the near surface structure undergoes mechanical instabilities along with complex folding and sliding of internal interfaces, which is responsible for the enhancement of sliding friction.因为这种结构显示在球体正常压痕下没有增强粘附性，所以它会在正常和剪切载量期间打破能量损失之间的连接。这使得许多应用中可能有趣，例如在轮胎中，其中一个人希望尽量减少滚动阻力（正常负载），同时最大化滑动摩擦（剪切装载）。
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