Bistable cell and multistable mechanical structure with multi-level structure

Abstract

The invention provides a bistable cell and a multistable mechanical structure with a multi-level structure. The bistable cell is a hollow rotary body, and the radial size of the middle part in the axial direction of the bistable cell is larger than that of the two end parts in the axial direction. The bistable cell comprises a first circular truncated cone part, a second circular truncated cone part and a first cambered surface part; the included angle between the inner side face of the first circular truncated cone part and the plane perpendicular to the axial direction of the bistable cell ranges from 45 degrees to 70 degrees; the included angle between the inner side face of the second circular truncated cone part and the plane perpendicular to the axial direction of the bistable cell ranges from 50 degrees to 85 degrees; and the first circular truncated cone part and the second circular truncated cone part are connected in a continuous transition mode through the first cambered surface part, and the wall thickness of the first cambered surface part is smaller than the wall thickness of the first circular truncated cone part and / or the wall thickness of the second circular truncated cone part. By adopting the technical scheme, the cambered surface part of the bistable cell consists of a curved surface with the continuously changing thickness, so that the failure caused by higher stress concentration is avoided.

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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