Bistable cell and multistable mechanical structure with multi-level structure

Abstract

The application proposes a bistable cell and a multi-stable mechanical structure with a multi-level structure. The bistable cell is a hollow body of revolution, and the radial direction of the axial middle part of the bistable cell is The size is larger than the radial size of the parts at both ends in the axial direction, and the bistable cell includes: a first frustum, the inner surface of the first frustum and a plane perpendicular to the axial direction of the bistable cell The included angle is 45 to 70 degrees; the second frustum, the angle between the inner surface of the second frustum and the plane perpendicular to the axial direction of the bistable cell is 50 to 85 degrees; the first arc The first arcuate surface connects the first circular truncated portion and the second circular truncated portion in a continuous transition, and the wall thickness of the first arcuate surface is smaller than that of the first circular truncated portion and / or the second circular truncated portion. The wall thickness of the frustum of the two circles. By adopting the above technical solution, the arc surface of the bistable cell is composed of a curved surface with continuously changing thickness, which avoids failure caused by high stress concentration.

Description

technical field [0001] The application belongs to the field of multi-stable mechanical structures, and in particular relates to a bistable cell and a multi-stable mechanical structure with a multi-level structure. Background technique [0002] The multistable structure has multiple stable states after deformation. Under the action of external force, the multistable structure can deform from the initial configuration to another deformed configuration, and maintain the deformed configuration after unloading, and store a certain elastic strain energy. Upon application of a reverse load, the deformed configuration can return to the initial configuration, enabling the multistable structure to reversibly switch between different stable states under external forces. [0003] Multistable structures are widely used in fields such as vibration isolation, energy absorption, and programmable structure design. The multistable structure can convert the energy input from the outside into...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent CN109826892B discloses a reusable multi-stable energy-absorbing array composite structure, which can withstand impact loads and realize repeated use, but its energy-absorbing modules are simply arranged in repeated arrays without interfering with each other so that the structure Multi-stable in only one direction, which has certain limitations in the case of possible multi-directional loads

[0005] In addition, the bistable cells used in the existing multistable structures are mostly composed of rods and other connecting parts. There will be gaps at the nodes where the rods intersect, the connecting parts, and the positions where the material thickness changes abruptly. Larger stress concentration can easily lead to structural failure

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