The Effect of Contact Duration and Indentation Depth on Adhesion Strength: Experiment and Numerical Simulation
- PDF / 1,645,165 Bytes
- 13 Pages / 612 x 792 pts (letter) Page_size
- 62 Downloads / 253 Views
RIMENTAL INSTRUMENTS AND TECHNIQUE
The Effect of Contact Duration and Indentation Depth on Adhesion Strength: Experiment and Numerical Simulation I. A. Lyashenkoa,b,* and V. L. Popova,c,d a Berlin
Technical University, Berlin, 10623 Germany State University, Sumy, 40007 Ukraine c National Research Tomsk State University, Tomsk, 634050 Russia d Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia *e-mail: [email protected] b Sumy
Received February 18, 2020; revised March 22, 2020; accepted March 22, 2020
Abstract—The adhesive contact between a spherical steel indenter and a fragment of a transparent soft rubber sheet fixed on a glass substrate has been studied experimentally. Comparison of experimental data with the results of analytic theory and numerical simulation has revealed quantitative agreement of the results of these three approaches. We have also studied the effect of the duration of the contact between the indenter and the indentation depth on its adhesion strength. The peculiarities of experiments performed with a controllable displacement and a controllable force are considered. DOI: 10.1134/S1063784220100126
INTRODUCTION The term “adhesion” is traditionally used for bonding between the surfaces of dissimilar bodies due to the intermolecular interaction forces. Adhesive interaction ensures the required mechanical coupling between cells and cellular structures in biological organisms, the strength of glued and soldered joints, as well as the strength of many industrial metal structures [1–4]. Owing to adhesion, many biological species are able to move over vertical surfaces. For example, geckos and many species of Amphibia (tree frogs and Phyllomedusas) are using adhesion for such movements. At present, there is a trend in science and technology toward using artificial adhesive surfaces [5, 6], for example, for moving parts in various technological processes are fabricated. As a rule, such surfaces consist of equidistant cylinders with various shapes of the base, which are fixed to a plane of an elastic material. The adhesion strength of a contact depends on the shape of the base of the cylinders and on the distances separating them. Such artificial materials form the basis of various mechanisms that can move over vertical surfaces. These mechanisms have already been used for manipulating with objects in robotized production; in the future, such mechanisms can be employed at space stations in conditions of outer space [7]. Because of high topicality, theoretical and experimental investigations of adhesive contact have been actively performed in recent years [8–10]. It was shown in these publications that the actual pattern of the adhesive interaction goes far beyond classical the-
ories of the type of Johnson–Kendall–Roberts (JKR) theory [11]. The difference from the theory is due to many factors (e.g., due to roughness that is always present on real surfaces and due to the fact the surface energy is distributed nonuniformly ov
Data Loading...
