论文标题
涂层披风：薄而坚硬的涂层如何有效地隐藏软底物？
Cloaking by coating: How effectively does a thin, stiff coating hide a soft substrate?
论文作者
论文摘要
从人体组织到果实，许多软材料都被薄薄的材料薄层覆盖。虽然这种涂层的主要作用通常是保护柔软的材料，但薄而坚硬的涂层也对复合材料的机械行为具有重要作用，从而使其显着更硬，而不是基础材料。我们研究了涂层对特定凹痕测试情况的这种掩饰效果，该涂层测量了复合固体的“牢固性”：我们使用理论和实验的组合来定量地表征牢固性。我们发现，缩进器的大小在确定披肩的有效性方面起着关键作用：小凹痕感觉到涂层和底物的材料特性的混合物，而大缩进器在很大程度上感觉到了未加固的底物。
From human tissue to fruits, many soft materials are coated by a thin layer of a stiffer material. While the primary role of such a coating is often to protect the softer material, the thin, stiff coating also has an important effect on the mechanical behaviour of the composite material, making it appear significantly stiffer than the underlying material. We study this cloaking effect of a coating for the particular case of indentation tests, which measure the `firmness' of the composite solid: we use a combination of theory and experiment to characterize the firmness quantitatively. We find that the indenter size plays a key role in determining the effectiveness of cloaking: small indenters feel a mixture of the material properties of the coating and of the substrate, while large indenters sense largely the unadulterated substrate.
