CN211513372U

CN211513372U - Protective clothing with negative Poisson ratio effect

Info

Publication number: CN211513372U
Application number: CN201922278060.0U
Authority: CN
Inventors: 任鑫; 罗荟琛; 王仕龙
Original assignee: Nanjing Tech University
Current assignee: Nanjing Tech University
Priority date: 2019-12-17
Filing date: 2019-12-17
Publication date: 2020-09-18
Anticipated expiration: 2029-12-17

Abstract

The utility model discloses a protective equipment with negative poisson's ratio effect, the structural design including guard ring part and liner. The retainer portion has a periodic hole pattern. The pad of the protective tool is composed of an inwards concave honeycomb structure, and the upper wall and the lower wall of the inwards concave honeycomb cell are provided with periodic hole structures. The utility model discloses a design of protective shroud part can play and dress comfortable effect, reduces the effort to shank or arm, and the protective shroud receives the pulling force can wear to take off toward the outer expansion person of facilitating the use. Through the structural design of the liner, the pressure resistance of the liner can be improved, the liner can be well attached to the body, and the influence caused by the movement of a user is reduced. The protective clothing has the advantages that the protective clothing protection area is increased, the manufacturing process is simplified, and the protective clothing integrally keeps good curved surface isotropy and wearing comfort.

Description

Protective clothing with negative Poisson ratio effect

Technical Field

The utility model relates to a have negative poisson ratio perforation structure through the design and design the protective equipment that has negative poisson ratio effect belongs to new material and new construction field.

Background

Protective clothing is a common sport product. Traditional protective equipment protective shroud part comprises elastic textile material, and is tighter, and tension is great, and it is very inconvenient to dress the user that the size is fat to the side, pulls hard when dressing and can cause the damage to the protective equipment. The user feels very uncomfortable when wearing the clothes on the arms or the legs for too long. Excessive pad area or thickness of the brace can affect the movement of the user's arms or legs.

Negative poisson's ratio materials and structures have special mechanical properties that undergo transverse contraction (expansion) under uniaxial pressure (tension). The perforated plate structure is an important type of negative Poisson ratio structure, the perforated plate structure with different microstructures can be obtained by arranging the cut holes with different shapes and distributions on the sheet structure, and the two-dimensional material of the perforated plate structure can show negative Poisson ratio behavior when being stretched and compressed. The perforated plate structure has great flexibility, and the design of irregularly distributed perforation, multi-stage perforation arrangement and the like endows the perforated plate structure with more design flexibility.

The utility model discloses combine together negative poisson ratio structure and 3D printing technique, design out the protective equipment that has negative poisson ratio effect, the protective shroud is drawn and the liner can demonstrate negative poisson ratio deformability respectively under the circumstances of pressurized and bending in the axial. Can play the comfortable effect of wearing through the design of protective shroud part, reduce the effort to shank or arm, the protective shroud receives the pulling force and can outwards expand the person of facilitating the use and wear to take off. Through the structural design of liner, can improve the compressive property of liner to let the liner possess good curved surface syntropy, during the user activity, the liner can laminate the health well, reduce the liner because of the great influence that brings of area or thickness.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects of the prior protective tool and manufacturing the protective tool by utilizing a negative Poisson ratio material and a negative Poisson ratio structure. The guard ring part of the protective tool can be expanded outwards when being subjected to tensile force, thereby being convenient for a user to put on and take off. The porous construction of the retainer also enhances the comfort of the wearer. The pad has a curved surface isotropy, and the pad does not interfere with a user when the user bends the arm or the leg.

The utility model adopts the technical proposal that: a protective clothing with a negative Poisson ratio effect comprises a protective ring with the negative Poisson ratio effect and a pad, wherein the protective ring is cylindrical, the cross section of the pad is arc-shaped, and the pad is sleeved outside the protective ring;

the guard ring is provided with a hole structure which is periodically alternated horizontally and vertically;

the liner is composed of a periodic inward concave honeycomb structure, and the upper wall and the lower wall of the inward concave honeycomb cell are provided with periodic hole structures which are alternated horizontally and vertically;

the longitudinal length of the retainer L1 is related to the longitudinal length of the liner L2 by: L2/L1 is more than or equal to 0.87 and more than or equal to 0.67;

the thickness T1 of the retainer satisfies: t1 is more than or equal to 3mm and more than or equal to 1 mm;

the thickness T2 of the liner satisfies: t2 is more than or equal to 20mm and more than or equal to 8 mm;

the radius R of the cross section of the retainer satisfies: r is more than or equal to 80mm and more than or equal to 55 mm;

the arc radian theta of the cross section of the gasket satisfies the following condition: 200 DEG is not less than theta and not less than 120 deg.

Preferably, the aperture configuration of the retainer and the insert has an elliptical, polygonal or rotated square aperture shape.

The design method of the protector with the negative Poisson ratio effect comprises the following steps:

1) determining the shape and size of each component of the protector according to the size of the leg or arm of a user, wherein the shape and size comprise guard ring thickness T1, length L1, cross section radius R, thickness T2 of the pad, length L2 of the pad and arc radian theta of the cross section of the pad;

2) designing a protective clothing guard ring part to have a periodic transverse and vertical alternate hole structure, reducing the hole space of the guard ring as much as possible under the condition that the guard ring meets the 3D printing requirement, and selecting TPU, PLA or PVA as a base material to perform 3D printing manufacturing after the size is determined;

3) designing a pad part of the protector to have a periodically repeated concave honeycomb structure, designing a periodically horizontal-vertical alternate hole structure on the upper wall and the lower wall of the concave honeycomb cell, and selecting TPU, PLA or PVA as a base material to perform 3D printing manufacturing after the size is determined;

4) the protector portion and padding are sewn into the interior using textile material to produce a protector having a negative poisson's ratio effect.

The utility model discloses its key that produces the negative poisson ratio effect lies in the structural design of protective equipment protective shroud and liner. Under the condition of meeting the 3D printing manufacturing requirement, the transverse-vertical alternating hole-shaped structure is ensured to be small enough, so that the guard ring and the pad have a negative Poisson ratio effect, and the whole protective tool also has the negative Poisson ratio effect. The protector designed by the method has obvious negative Poisson ratio effect, and can maintain the negative Poisson ratio performance in a large strain range. In addition, the designed negative Poisson ratio protector can not only show the negative Poisson ratio performance under axial stretching, but also show the negative Poisson ratio performance under the bending action.

Has the advantages that: the utility model discloses a protective equipment has great negative poisson ratio effect and can show negative poisson ratio effect under the axial tension is crooked simultaneously. The guard ring part produces the auxetic effect under tensile effect, and the person of facilitating the use dresses avoids causing the damage to the protective equipment. The protective clothing has the advantages that the protective clothing protection area is increased, the manufacturing process is simplified, and the protective clothing integrally keeps good curved surface isotropy and wearing comfort.

Drawings

FIG. 1 is an overall structure view of the protector with negative Poisson ratio effect of the present invention;

fig. 2 is a schematic structural diagram of a concave honeycomb cell of the present invention;

FIG. 3 is a front view of the protector with negative Poisson's ratio effect of the present invention;

FIG. 4 is a top view of the protector with negative Poisson's ratio effect according to the present invention;

FIG. 5 is a schematic view of the retainer of the present invention;

fig. 6 is a schematic structural view of the gasket of the present invention.

Detailed Description

The invention will be further described with reference to the following specific embodiments and the accompanying drawings:

as shown in fig. 1-6, a protector with negative poisson's ratio effect comprises a guard ring 1 and a pad 2 with negative poisson's ratio effect, wherein the guard ring 1 is cylindrical, the cross section of the pad 2 is arc-shaped, and the pad 2 is sleeved outside the guard ring 1;

the guard ring 1 is provided with a periodic hole structure which is alternated horizontally and vertically;

the pad 2 consists of a periodic concave honeycomb structure, and the upper wall and the lower wall of the concave honeycomb cell have periodic hole structures which are alternated horizontally and vertically; the hole shapes of the hole structures of the retainer 1 and the gasket 2 are oval, polygonal or rotary square;

the longitudinal length L1 of the retainer 1 and the longitudinal length L2 of the gasket satisfy the following relations: L2/L1 is more than or equal to 0.87 and more than or equal to 0.67;

the thickness T1 of the retainer 1 satisfies: t1 is more than or equal to 3mm and more than or equal to 1 mm;

the thickness T2 of the gasket 2 satisfies: t2 is more than or equal to 20mm and more than or equal to 8 mm;

the radius R of the cross section of the retainer 1 satisfies: r is more than or equal to 80mm and more than or equal to 55 mm;

the arc radian theta of the cross section of the gasket 2 satisfies the following condition: 200 DEG is not less than theta and not less than 120 deg.

The utility model discloses the protective equipment that the method was made produces the effect protective shroud that draws and expands outward when the protective shroud part received the pulling force, and convenient to use person dresses more or takes off, thereby avoids causing the damage to protective equipment itself owing to pull hard. The porous structure of the retainer also makes it more comfortable for the user to wear, reducing the force of the retainer on the legs or arms. The protective area and thickness of the brace can be increased while simplifying the manufacturing process. When the user bends the arm or the leg, the pad can be well attached to the human body due to the curved surface isotropy.

It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.

Claims

1. A protector having a negative poisson's ratio effect, the protector characterized by: the device comprises a guard ring and a liner, wherein the guard ring has a negative Poisson ratio effect, the guard ring is cylindrical, the cross section of the liner is arc-shaped, and the liner is sleeved outside the guard ring;

2. The brace of claim 1 having a negative poisson's ratio effect, wherein: the hole shapes of the hole structures of the retainer and the gasket are oval, polygonal or rotary square.