Design of Specific Properties for Bistable Structures Based on Pre-stress and Localization Reinforcement

doi:10.3901/JME.2019.03.162

Abstract

Abstract: Designing configurations and actuation positions of bistable structures is a key to improve its snap-through properties. Pre-compressed bistable structures with specific snap-through properties are designed by integrated regulating the pre-compression, parameters of local reinforcements and the actuation position. Firstly, the forming process of a pre-compressed bistable beam with local reinforcements is introduced and the design equation of pre-compressed bistable structures with special properties is presented on the basis of theoretical analysis. Then, based on the finite element method, the effects of design parameters (the pre-compression, actuation position, sizes and position of local reinforcements) in the design equation on snap-through properties (the offset snapping force and the arch height) are verified, and the contour map of snap-through properties is drawn. Finally, a pre-compressed bistable beam with expected arch height 3.57 mm and the offset snapping force 1.20 N is designed and fabricated according to the contour map of snapping-through properties The experimental results show that the simulated arch height and offset snapping force of the tested pre-compressed bistable structure are only 1.68% and 11.67% deviated from the experimental results, verifying the accuracy of design results.

Key words: bistability, design, local reinforcement, preloading, snap-through

CLC Number:

S255

GAO Renjing, LI Mingli, ZHAO Jian, LIU Shutian. Design of Specific Properties for Bistable Structures Based on Pre-stress and Localization Reinforcement[J]. Journal of Mechanical Engineering, 2019, 55(3): 162-168.

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