Organisms like the octopus or the clingfish are a precious source of inspiration for the design of innovative adhesive systems based on suction cups, but a complete mechanical description of their attachment process is still lacking. In this paper, we exploit the recent discovery of the presence of hairs in the acetabulum roof of octopus suction cups to revise the current model for its adhesion to the acetabulum wall. We show how this additional feature, which can be considered an example of a hierarchical structure, can lead to an increase of adhesive strength, based on the analysis of the cases of a simple tape and an axisymmetrical membrane adhering to a substrate. Using peeling theory, we discuss in both cases the influence of hierarchical structure and the resulting variation of geometry on the adhesive energy, highlighting how an increase in number of hierarchical levels contributes to its increment, with a corresponding improvement in functionality for the octopus suckers.

中文翻译：

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毛发在章鱼吸盘粘附中的作用：分层剥离方法。

章鱼或or鱼等生物是设计基于吸盘的创新粘合系统的宝贵灵感来源，但仍缺乏对其附着过程的完整机械描述。在本文中，我们利用了章鱼吸盘髋臼顶上存在的毛发的最新发现，来修改当前模型对章鱼吸壁的粘附性。我们将基于简单胶带和轴对称膜粘附在基材上的情况进行分析，展示这种附加功能（可以视为分层结构的示例）如何导致粘合强度的提高。使用剥离理论，我们讨论了两种情况下分层结构的影响以及由此产生的几何变化对粘合能的影响，