论文标题
有限变形控制了各向异性剪切诱导的软弹性接触的面积
Finite deformations govern the anisotropic shear-induced area reduction of soft elastic contacts
论文作者
论文摘要
涉及软材料的固体接触在机械工程或生物力学中很重要。在实验上，已经证明这种接触在剪切下显着收缩，这种效果通常使用粘附模型来解释。在这里，我们表明，只要考虑到有限的变形，就可以使用非粘附模型获得与最新高负载实验的定量一致性，而没有可调参数。该模型的分析揭示了剪切诱导的面积减少的基本机制，局部接触抬起是主要的机制。我们通过跟踪与光滑的光滑弹性体球的表面插入的剪切诱导的示踪剂的演变，通过实验确认所有这些机制的相关性，与光滑的玻璃板接触。我们的结果表明，在解释涉及软材料的各种剪切接触实验时，有限变形是粘附的替代方法。
Solid contacts involving soft materials are important in mechanical engineering or biomechanics. Experimentally, such contacts have been shown to shrink significantly under shear, an effect which is usually explained using adhesion models. Here we show that quantitative agreement with recent high-load experiments can be obtained, with no adjustable parameter, using a non-adhesive model, provided that finite deformations are taken into account. Analysis of the model uncovers the basic mechanisms underlying shear-induced area reduction, local contact lifting being the dominant one. We confirm experimentally the relevance of all those mechanisms, by tracking the shear-induced evolution of tracers inserted close to the surface of a smooth elastomer sphere in contact with a smooth glass plate. Our results suggest that finite deformations are an alternative to adhesion, when interpreting a variety of sheared contact experiments involving soft materials.
