Interaction of a non-axisymmetric artificial single spatula with rough surfaces

Author:

Cheng Qian1ORCID,Jiang Zhizhen1ORCID,Borodich Feodor M.1,Gorb Stanislav N.2ORCID,Jin Xiaoqing1

Affiliation:

1. College of Aerospace Engineering, Chongqing University, Chongqing 400030, People's Republic of China

2. Department of Functional Morphology and Biomechanics, Zoological Institute, University of Kiel, Am Botanischen Garten 1–9, Kiel 24098, Germany

Abstract

Hair-like attachment structures are frequently used by animals to create stable contact with rough surfaces. Previous studies focused primarily on axisymmetric biomimetic models of artificial spatulas, such as those with a mushroom-shaped and cylinder-shaped geometry, in order to simulate the so-called gecko effect. Here, two geometric prototypes of artificial adhesive structures with non-axisymmetric properties were designed. The investigation of the prototype’s interactions with rough surfaces was carried out using the finite element software ABAQUS. Under increasing vertical displacement, the effect of asperity size on the contact pressure evolution of the spatula was investigated. It has been demonstrated that the contact behaviour is greatly affected by the flexibility of the spatula, which is caused by its variable thickness. The thinner spatula shows a higher nominal contact area and attaches more strongly to various rough surfaces. Although a thicker spatula is more susceptible to the ‘leverage’ phenomenon, which occurs when excessively applied displacements prematurely reduce the nominal contact area, it obtains the ability to regulate attachment during unidirectional loading. Two non-axisymmetric prototypes provide different design concepts for the artificial adhesives. It is hoped that this study will provide fresh viewpoints and innovations that contribute to the development of biologically inspired adhesives.

Funder

National Natural Science Foundation of China

Opening Fund of State Key Laboratory of Nonlinear Mechanics

Publisher

The Royal Society

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