Concave hexagonal negative Poisson's ratio structure based on dielectric electroactive polymers

Abstract

The invention discloses a concave hexagonal negative Poisson's ratio structure based on dielectric electroactive polymers. The structure is formed by a concave hexagonal negative Poisson's ratio cell array, and the cells consist of bones (101~104) and tendons (105~106). The tendons are made of dielectric electroactive polymers, and are of a sandwich board structure, sandwich materials are dielectric elastomers, two sides are flexible electrodes, and the Young's modulus of bone materials is larger than that of the tendon materials. The flexible electrodes of upper and lower surfaces of the tendons 105 and 106 are connected with the positive electrode and the negative electrode of high-voltage direct current power supplies 107 and 108 respectively, and the voltage and path open-circuit state are adjustable. The concave hexagonal negative Poisson's ratio cells are arrayed, and thus the concave hexagonal 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 concave hexagonal negative Poisson's ratio structure are realized.

Description

technical field [0001] The invention relates to a concave hexagonal negative Poisson's ratio structure, in particular to a concave hexagonal negative Poisson's ratio structure based on a dielectric electroactive polymer. Background technique [0002] The Negative Poisson's Ratio (NPR) structure is a new type of structure with unique mechanical properties. When it is compressed, it will shrink laterally instead of expanding laterally, so the material will automatically concentrate on the loading site to be more effective. The stiffness of the structure will also increase non-linearly with the increase of the 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 exc...

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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