Mechanical design and energy absorption analysis of spherical honeycomb core for soft-landing device buffer shell
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O R I G I NA L PA P E R
Yangyang Dong · Tong Yu · Zijian Zhang
Mechanical design and energy absorption analysis of spherical honeycomb core for soft-landing device buffer shell
Received: 13 May 2020 / Revised: 1 June 2020 © Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Soft-landing buffer systems with spherical curvature outer shells are widely used in the aerospace field, which not only requires its efficient and smooth buffer performance, but also that the shell of the landing buffer system is compact and lightweight. This paper presents a novel design method for the spherical honeycomb core structure for a soft-landing device buffer shell. The proposed method aims to realize the positive sphere characteristics of the honeycomb core by adopting the spherical mosaic of a truncated icosahedron and the triangle formation principle. Furthermore, according to the relationship of the deformation and the energy absorption performance, the optimum structural parameters are obtained by discussing the mechanical properties of the inner core, which determine the unit size and density of the whole model. At the same time, we estimate the distortion rate caused by projection that can be considered as an evaluation criterion to describe the performance of the proposed structure of the spherical honeycomb core. Simulation tests are carried out employing Abaqus/explicit to analyze the distortion impact and the energy-absorbtion properties of the proposed structures under different actual environments.
1 Introduction Spherical robots [1,2] or soft-landing buffer systems with arbitrary curvature outer shells play an important role in airdropping supplies [3,4], handling obstacles [5,6] and other aerospace fields [7–10]. Thence, the buffer system is required to have a relatively low density and small size, and its outer shell needs to have excellent buffering and energy-absorbing properties, so as to ensure the robot to complete the post-operation tasks. Currently, honeycomb sandwich structures are commonly used as soft-landing buffering systems [11–13]. Honeycomb structures are a kind of classical sandwich structure material, which originated from bionics and was initially invented to be used in the aerospace field. With the continuous exploration and optimization by researchers [14,17], honeycomb sandwich structures nowadays, as an excellent energy-absorbing material [18,19], are widely used in various fields such as transportation [20], architecture [21–23] and especially aerospace [24,25]. For the purpose of a compact and light outer shell, a particular design of honeycomb structure is required to adapt the spherical curvature shapes. For spherical honeycomb structures, how to properly distribute the regular hexagonal units along the spherical surface is the key to solve the problem. Few such papers have been published yet [26–28]. The structure of fullerene C720 [29] is a convex polyhedron composed of 115 hexagons and 12 pentagons; however, this structure cannot meet the demands since its circumscrib
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