Ear cap with negative Poisson's ratio effect and design method thereof

Abstract

The invention discloses an ear cap with a negative Poisson's ratio effect and a design method thereof. The ear cap comprises an ear cap surface with the negative Poisson's ratio effect and an ear caproot; the surface of each ear cap is in a round cover shape, and the root of each ear cap is cylindrical. The ear cap surface and the ear cap root are of a tubular structure with holes which are periodically, transversely and vertically alternated. According to the invention, the key of generating the negative Poisson's ratio effect is the design of negative Poisson's hole structures on the surface and the root of the ear cap. Under the condition that 3D printing manufacturing requirement is met, the ear cap guarantees that the hole-shaped structures which are alternated transversely and vertically are small enough, the surface and the root of the ear cap have the negative Poisson's ratio effect, and therefore, the whole ear cap has the negative Poisson's ratio effect. The ear cap designedby the method has an obvious negative Poisson's ratio effect, and the negative Poisson's ratio performance can be maintained in a large strain range. In addition, the designed negative Poisson's ratio ear cap not only can show negative Poisson's ratio performance under axial tensile compression, but also can show negative Poisson's ratio performance under bending action.

Description

technical field [0001] The invention relates to an ear cap with a negative Poisson's ratio effect by designing a perforated structure with a negative Poisson's ratio, and proposes a design method for the negative Poisson's ratio ear cap, which belongs to the field of new materials and new structures. Background technique [0002] Negative Poisson's ratio materials and structures have mechanical properties different from traditional materials, which undergo lateral contraction (expansion) under uniaxial compression (tension). Compared with traditional materials, negative Poisson's ratio materials have advantages in many aspects, such as shear modulus, fracture resistance, notch resistance, energy absorption and dissipation, and resilience toughness. Because of these excellent properties, negative Poisson's ratio materials have increasingly broad application prospects in the medical field, sound insulation materials, electromagnetic materials, protective equipment, and militar...

AI Technical Summary

Problems solved by technology

When the earphones are worn for a long time, it will cause swelling or even pain in the wearer's ears, and improper wearing methods will also cause the earphones to fall off

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