Star-shaped Negative Poisson's Ratio Structure Based on Dielectric Electroactive Polymers

Abstract

The invention discloses a starlike negative Poisson's ratio structure based on dielectric electroactive polymers. The structure is formed by a starlike negative Poisson's ratio cell array, and the cells consist of a quadrangular starlike bone 101 and four tendons (102~105). The tendons are made of dielectric electroactive polymers, and are of a sandwich structure, sandwich materials are dielectric elastomers, two sides are flexible electrodes, and the Young's modulus of the bone is larger than that of tendon materials. The flexible electrodes of two sides of the tendons are connected with the positive electrode and the negative electrode of high voltage direct current power supplies 106~109, and the voltage and path open-circuit state are adjustable. The starlike negative Poisson's ratio cells are arrayed, and thus the starlike negative Poisson's ratio structure can be formed. Since the mechanical states and electrostatic states of the dielectric electroactive polymers are mutually coupled, mutual conversion between mechanical energy and electric energy can be realized, and functions of structure real-time variability, actuation, energy recovery and sensing of the starlike negative Poisson's ratio structure are realized.

Description

technical field [0001] The invention relates to a star-shaped negative Poisson's ratio structure, in particular to a star-shaped negative Poisson's ratio structure based on a dielectric type electroactive polymer. Background technique [0002] The Negative Poisson's Ratio (NPR) structure is a new type of structure with unique mechanical properties. It expands laterally instead of contracting laterally when it is tensioned, so the material can bear the load more effectively, and the stiffness of the structure It will also increase linearly with the increase of load, so the negative Poisson's ratio structure can make full use of the mechanical properties of the material. The mechanical properties of the negative Poisson’s ratio structure are closely related to the mechanical properties and structural parameters of the materials used. After certain material and parameter design, the negative Poisson’s ratio structure can have excellent energy absorption efficiency and damping p...

AI Technical Summary

Problems solved by technology

Electroactive polymers can be mainly divided into two categories: ionic type and electric field type: ionic type electroactive polymers use chemical energy as a transition to realize the conversion between electrical energy and mechanical energy, and their advantages are low driving voltage and large deformation, but the response Slow and low energy density, so difficult to apply to energy absorbing parts under dynamic conditions

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