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arXiv 2005.02107cond-mat.softphysics.class-ph
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有限变形控制各向异性剪切引起的软弹性接触面积减少

Finite deformations govern the anisotropic shear-induced area reduction of soft elastic contacts

J. Lengiewicz, M. de Souza, M. Lahmar, C. Courbon, D. Dalmas, S. Stupkiewicz, J. Scheibert

摘要:

涉及软材料的固体接触在机械工程或生物力学中是重要的。实验上,这种接触已被证明在剪切下显著收缩,这种效应通常使用粘附模型来解释。在这里,我们表明,与最近的高负荷实验的定量协议,可以得到,没有可调参数,使用非粘性模型,只要考虑到有限的变形。模型的分析揭示了剪切引起的面积减少的基本机制,局部接触提升是占主导地位的。我们证实实验的相关性,所有这些机制,通过跟踪剪切诱导的示踪剂插入靠近表面的光滑的弹性体球接触光滑的玻璃板的演变。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案。

英文摘要:

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.

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