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Nail with negative Poisson's ratio effect and design method thereof

A technology of negative Poisson's ratio and nails, which is applied in the field of new materials and new structures, can solve the problems of less three-dimensional negative Poisson, backwardness, weak bearing capacity and impact resistance, and achieve firmness, difficulty in pulling out, and high compressive strength , the effect of low tensile strength

Pending Publication Date: 2019-01-15
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the existing literature is still based on two-dimensional negative Poisson's ratio material research
Most of the three-dimensional negative Poisson's ratio materials are porous structures with complex internal structures. Due to the backward manufacturing technology in the past, there are few three-dimensional negative Poisson's ratio materials that are actually used in practice.
Most of the negative Poisson's ratio material substrates designed and manufactured in the past are rubber, with weak load-bearing capacity and impact resistance

Method used

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  • Nail with negative Poisson's ratio effect and design method thereof
  • Nail with negative Poisson's ratio effect and design method thereof
  • Nail with negative Poisson's ratio effect and design method thereof

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Embodiment Construction

[0027] Below in conjunction with specific embodiment and accompanying drawing, the present invention will be further described:

[0028] As shown in Figures 1 and 2, a nail with a negative Poisson's ratio effect comprises a nail head 1, a nail shank 2 and a nail tail 3;

[0029] The thickness h and cylinder diameter D of the nail head 1 1 Satisfy: 5.5>D 1 / h>2;

[0030] The circular tube outer diameter D of the nail shank 2 with nail head diameter D 1 Satisfy: 3>D 1 / D 2 >1.6;

[0031] The length L of the round tube of the nail shank and the outer diameter D of the round tube 2 Satisfy: 8>L / D 2 >1.5;

[0032] The nail shank 2 is a tubular structure with periodically alternating horizontal and vertical holes;

[0033] The nail shank 2 satisfies: 0.15>round tube thickness / round tube length>0.08;

[0034] The nail tail 3 satisfies: 32°≥θ≥15°;

[0035] The detailed steps for the design of the above-mentioned nail with negative Poisson's ratio effect are as follows:

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Abstract

The invention discloses a nail with the negative Poisson's ratio effect and a design method thereof. The nail includes a head portion, a rod portion and a tail portion of the nail. The rod portion becomes thinner due to pressure and is easier to break in when the nail is pushed in; when the nail is pulled out, the rod portion becomes thicker due to the pull force and is difficult to pull out, so the nail is more durable and practical than ordinary nails. The brief operation steps are as follows, firstly, the minimum size that a 3D printer can accurately print is determined; secondly, hole distribution of the tubular structure of the nail rod is designed, so the tubular structure has the negative Poisson's ratio effect, during design, that the size of each part of the nail should not be less than the minimum size that can be printed by the 3D printer should be noted; the nail head and the tail portion that match the tubular structure are further designed, overall design of the negativePoisson nail is completed, and the 3D printing technology is utilized to make the designed nail. The method is advantaged in that the designed nail is proved to be quite novel and practical.

Description

technical field [0001] The invention relates to a nail with a negative Poisson's ratio effect by designing a tubular structure with a negative Poisson's ratio, and proposes a design method for a negative Poisson's ratio nail, which belongs to the field of new materials and new structures. Background technique [0002] Negative Poisson's ratio materials and structures have unusual mechanical properties. Unlike traditional materials that expand and contract, negative Poisson's ratio materials undergo lateral contraction (expansion) under uniaxial compression (tension). Negative Poisson's ratio materials have many ideal properties, and they have advantages over traditional materials in terms of shear resistance, fracture resistance, energy absorption capacity, and dent resistance. Because of these excellent properties, negative Poisson's ratio materials have increasingly broad application prospects in the fields of medical equipment, sensors, protective equipment, aviation, nav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B15/00
CPCF16B15/00
Inventor 任鑫谢亿民张相玉王锦沈炜
Owner NANJING UNIV OF TECH
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