Double-layer spinning origami honeycomb interlayer energy-absorbing material and preparation method thereof

Abstract

The invention provides a double-layer spinning origami honeycomb interlayer energy-absorbing material which comprises a core layer and metal skins covering the upper end face and the lower end face of the core layer; the core layer is formed by origami honeycomb cell elements in an array mode, and each origami honeycomb cell element is composed of origami honeycomb unit cells which are symmetrically arranged up and down. The contact ends of the origami honeycomb unit cells and the metal skin are large-diameter ends, and the other ends are small-diameter ends; the large-diameter ends and the small-diameter ends are both in a regular hexagon shape, the side length of the large-diameter ends is twice that of the small-diameter ends, and the included angle between the normal projection of the small-diameter ends and the corresponding sides of the large-diameter ends is 0-30 degrees; and the large-diameter ends and the small-diameter ends of the origami honeycomb unit cells are open. The core layer deforms due to compression of external force, and kinetic energy of an external load is absorbed and converted into strain energy of the double-layer spinning origami honeycomb sandwich structure, so that the loaded process of a protected body is smoother, and the effects of energy absorption and vibration reduction are achieved.

Description

technical field [0001] The invention belongs to the technical field of protective energy-absorbing materials, and in particular relates to an energy-absorbing interlayer structure and a preparation method thereof, which are used as protective energy-absorbing materials. Background technique [0002] "Energy saving, environmental protection, and safety" have always been important themes in the development of the transportation industry. With the continuous emergence of energy shortages, environmental pollution, and traffic accidents, people's requirements for energy conservation, environmental protection, and traffic safety are also increasing. Lightweight energy-absorbing materials came into being. In recent years, with the increasing maturity of material preparation and molding technology, a variety of lightweight energy-absorbing materials with a sandwich structure as the design framework have emerged: honeycomb sandwich structure, foam sandwich structure, lattice sandwich...

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Problems solved by technology

[0003]The traditional regular hexagonal honeycomb is a weight-reducing and energy-absorbing structure often used in contemporary lightweight design. In order to change the energy-absorbing performance of honeycomb sandwich panels, several This method was proposed in the literature (Gunes R(2016) Development of numerical realistic model for predicting low-velocity impact response of aluminum honeycomb sandwich structures. Journal of Sandwich Structures and Materials18(1):95-112. ; Tolga T(2018) Investigation of low velocity impact behaviors of honeycomb sandwich composites. Journal of Mechanical Science and Technology32(7):3161-3167. ;Giulia P(2018) Single and double-layer honeycomb sandwich panels under impact loading. International Journal of Impact291 Engineering:7) There are limited types of methods to change the energy absorption performance of honeycomb sandwich structures, and they are all proposed on the basis of changing their materials or geometric parameters, which have certain limitations in practical applications: (1) The initial buckling of traditional regular hexagonal honeycomb structures The load is high, and it requires a lot of energy to trigger its deformation and energy absorption mechanism, so it is difficult to achieve a protective effect when it collides with vulnerable protected objects such as the human body; (2) For the traditional regular hexagonal honeycomb structure, although it can Improve its energy absorption performance by increasing the side length of the core unit, but in environments with limited application space (such as helmets, protective gear, engine covers, etc.), the design size of the honeycomb structure is limited, so this method is difficult to meet Practical application requirements

[0004]The triangular origami circular tube is a research hotspot in the field of origami design in recent years, and several design methods and applications have been proposed in the literature (Guest S (1994) The folding of triangulated cylinders. I. Geometric considerations. Transactions of the ASME. Journal of Applied Mechanics61(4):773-777;Guest S (1994) The folding of triangulated cylinders.II. (4) :778-783; Wu Z(2007) Optimization of crush characteristics of the cylindrical origami structure. Int. J. Vehicle Design43 :66-81. Optimal Design. Mechanical Design and Research 29(02):74-77.;Zhou Lingli(2013) Optimal Design of Impact Energy Absorption Characteristics of Inverted Helical Thin-walled Structures. Chinese Journal of Mechanical Engineering 49(11):193-198.; Ye Zhen (2019). Multi-stable characteristics of origami structures and their vibration damping performance. Master's thesis, Southeast University, Nanjing.), however, these studies on triangular origami tubes are based on equilateral structures in the axial direction type, and the deformation of existing origami tubes is mainly through creases, which has certain limitations in practical applications: (1) When the triangular origami tubes with equilateral configuration are arranged in the horizontal direction, each circle It is easy to cause interference between the tubes, which is not conducive to the compact layout of the cells; (2) The triangular origami circular tube with equilateral configuration will expand to a certain range around the structure when it is compressed, which may cause motion interference to the surrounding components. (3) The origami structure deforms mainly through the creases. When loaded, the triangular panels only fold along the creases, but hardly deform themselves. caused a lot of waste

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