The Topology of the Leg Joints of the Beetle (Scarabaeidae, Cetoniinae) and Its Implication for the Tribological Properties.

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ID: 102807
2018
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Abstract
Locomotion of walking insects is exceptionally efficient. The function of their leg joints in different movement scenarios depends on their kinematics and contacting conditions between moving parts. The kinematics was previously studied in some insects, but contact mechanics within the joints remains largely unknown. In order to understand the complex topology of the contacting surfaces of the leg joints in the Congo rose beetle (Scarabaeidae, Cetoniinae), we have investigated the shape, the waviness, and the roughness of the joint base and its counter body by applying confocal laser scanning microscopy and white light interferometry. Additionally, we performed nanoindentation tests on the contacting joint surfaces, in order to analyze material properties (elasticity modulus and hardness) of the joint cuticle. We found two topological design principles of the contact surfaces that might be considered as adaptations for reducing frictional drag during leg movements. First, the contact pairs of all leg joints studied consist of convex and concave counterparts. Second, there is a smooth and a rough surface in contact in which microprotuberances are present on the rough surface. These principles might be potentially interesting for technical implications, to design bioinspired joints with both reduced friction and wear rate.
Reference Key
vagts2018thebiomimetics Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Vagts, Steffen;Schlattmann, Josef;Kovalev, Alexander;Gorb, Stanislav N;
Journal biomimetics (basel, switzerland)
Year 2018
DOI
E12
URL
http://www.mdpi.com/2313-7673/3/2/12
Keywords
locomotion topology walking insect arthropoda friction leg biotribology contact mechanics joints

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