CN112710193B - Small-recess impact-resistant bionic bulletproof helmet - Google Patents

Abstract

The invention belongs to the technical field of protective bulletproof equipment, and in particular relates to a small depression anti-impact bionic bulletproof helmet, comprising a hard impact-resistant layer, a soft energy-absorbing layer, a composite layer and an inner lining layer stacked in sequence from an outer layer to an inner layer ;The hard impact-resistant layer, the soft energy-absorbing layer, the composite layer and the inner lining layer are connected by glue; The holes are arranged in a gradient; a plurality of rows of second through holes are arranged along the circumferential direction inside the composite layer, the plurality of rows of second through holes are staggered, and the second through holes are filled with flexible materials. Among them, the impact-resistant layer can buffer most of the impact energy of the bullet; the soft energy-absorbing layer absorbs impact energy through large deformation; the composite layer reduces the degree of depression through hard materials to avoid damage to the human body, and uses flexible materials to absorb impact energy. The lining layer can reduce the impact of the bullet on the head and reduce the damage to the human body.

Description

A small dent impact-resistant bionic bulletproof helmet

technical field

The invention belongs to the technical field of protective bulletproof equipment, and in particular relates to a small depression anti-impact bionic bulletproof helmet.

Background technique

Nowadays, weapons and equipment are becoming more and more advanced, and their lethality to the human body is also increasing. The life safety of individual soldiers is seriously threatened. Among them, the protection of the head is of great significance to ensure the safety of individual soldiers, and bulletproof helmets, as a main head protection equipment, need further development to resist the increasing lethality of weapons and equipment and improve the protection performance.

Bulletproof helmets can be roughly divided into metal bulletproof helmets, non-metal bulletproof helmets and metal and non-metal composite bulletproof helmets according to the different helmet shell materials. At present, the military-grade bulletproof helmets used in the army are mainly two kinds of bulletproof helmets, ultra-high molecular weight polyethylene (U-PE) and polyphthalamide (aramid). Compared with the old steel helmets, these two bulletproof helmets are lighter and more comfortable, and their protective performance has also been greatly improved. However, in the actual measurement process, it was found that although these two helmets can resist the penetration of bullets, the inward concave deformation of the impact point is large, which will cause a major impact on the head, causing a series of problems in the human body and causing irreversible damage. .

Therefore, it is urgent to propose a bionic bulletproof helmet that can reduce the indentation depth of the helmet and enhance the protective performance of the bulletproof helmet.

SUMMARY OF THE INVENTION

(1) Technical problems to be solved

Aiming at the technical problems of large indentation depth and poor impact resistance existing in the existing bulletproof helmets, the present invention provides a small depression impact resistance bionic bulletproof helmet.

(2) Technical solutions

In order to achieve the above-mentioned purpose, the main technical scheme adopted in the present invention includes:

A small depression impact-resistant bionic bulletproof helmet, comprising a hard impact-resistant layer, a soft energy-absorbing layer, a composite layer, and an inner lining layer stacked in sequence from an outer layer to an inner layer; a hard impact-resistant layer, a soft energy-absorbing layer The layers, the composite layer and the inner lining layer are connected by glue; the interior of the soft energy-absorbing layer is provided with multiple rows of first through holes along the circumferential direction, and the multiple rows of first through holes are arranged in a gradient; the interior of the composite layer is arranged along the ring A plurality of rows of second through holes are arranged in the direction, the plurality of rows of second through holes are staggered, and the second through holes are filled with flexible materials.

Further, the hard impact-resistant layer is made of one of hard ceramics and light alloys.

Further, the soft energy-absorbing layer is made of one or more of sponge, rubber and latex.

Further, the cross section of the first through hole is a parallelogram, and the side length of the parallelogram is 0.1 mm˜0.8 mm.

Further, the distance between the upper and lower holes of two adjacent first through holes is 0.5 mm˜1 mm.

Further, the composite layer is made of hard material and flexible material; the hard material is one of hard ceramic and hard alloy; the flexible material is viscoelastic material.

Further, the viscoelastic material is silicone rubber.

Further, the cross section of the second through hole is square, and the side length of the square is 2 mm˜4 mm.

Further, the distance between the upper and lower holes of two adjacent second through holes is 0.5mm˜1.5mm.

Further, the inner liner is made of shape memory polymer fibers.

(3) Beneficial effects

The beneficial effects of the invention are as follows: the invention provides a small depression impact-resistant bionic bulletproof helmet, and the helmet is arranged in four layers. Among them, the impact-resistant layer is used as the outermost layer, and hard ceramics are selected to buffer most of the impact energy of the bullet. The soft energy-absorbing layer, as the secondary outer layer, absorbs the impact energy through large deformation when it is impacted; among them, the first through holes inside the soft energy-absorbing layer are arranged in a gradient between layers, realizing large deformation in the middle and small deformation in the outside , which is conducive to the transition bonding between dissimilar materials and avoids delamination between layers. The composite layer is used as the secondary inner layer. Compared with most of the energy-absorbing layers, flexible materials are used to absorb impact energy through large deformation. . The inner liner is used as the inner layer, and the shape memory polymer fiber is selected. When the helmet is impacted, the temperature around the impact point of the helmet rises rapidly, the shape memory polymer fiber deforms, and bulges outward near the impact point. The cavity is conducive to the spread of the impact stress to the surrounding, reducing the impact on the head and reducing the damage to the human body.

Description of drawings

Figure 1 is a schematic diagram of the head of a woodpecker.

FIG. 2 is a schematic structural diagram of a small depression impact-resistant bionic bulletproof helmet of the present invention.

FIG. 3 is a schematic diagram of an enlarged cross-sectional structure at the point A in FIG. 2 .

[Description of reference numerals]

1. Hard impact-resistant layer; 2. Soft energy-absorbing layer; 3. First through hole; 4. Composite layer; 5. Second through hole; 6. Inner lining layer.

Detailed ways

In order to better explain the present invention and facilitate understanding, the present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments. Wherein, the orientation terms such as "outer layer" and "inner layer" mentioned in this document all refer to the orientation of FIG. 3 . The "outer layer" refers to the layer on the right in Figure 3, and the "inner layer" refers to the layer on the left in Figure 3.

The invention is inspired by the impact-resistant structure of the woodpecker's head. It has been subjected to high-frequency impact for a long time without any damage to the brain. Further research has found that this is the result of the joint action of the woodpecker's beak, tongue and skull. As shown in Figure 1, when the head of a woodpecker is hit, the stress propagates first through the beak of the woodpecker, which acts as a rigid material to dissipate most of the impact energy, and then transfers it to the tongue, which acts as a flexible layer that only surrounds the entire head , slowly release a part of the impact energy, and finally transfer it to the skull. The skull is a plate-like porous structure, and the holes are filled with a large amount of viscoelastic liquid, and the mucus dissipates the remaining impact energy. , the internal brain is not easily squeezed. The outermost layer of the present invention realizes and imitates the woodpecker beak, and adopts hard impact-resistant material to dissipate most of the impact energy of the bullet; Slow release energy; the sub-inner layer realizes and imitates the skull of a woodpecker, which is a composite layer, which not only slows down the impact energy but also realizes a small indentation, reducing the impact and damage to the head; the innermost layer is used as an inner lining layer to ensure comfort At the same time, it can achieve small depressions, so shape memory polymer fibers are used. When the helmet of the present invention is impacted, the temperature around the impact point rises, the shape memory polymer fibers are deformed, and bulge outward around the impact point, resisting the impact while staying away from the head to form a cavity, which is conducive to the diffusion of impact energy around.

Example 1

As shown in FIG. 2 and FIG. 3 , the present invention provides a small depression impact-resistant bionic bulletproof helmet. The bulletproof helmet sequentially includes from the outer layer to the inner layer: a hard impact-resistant layer 1 , a soft energy-absorbing layer 2 , a composite layer 4 and an inner lining layer 6 .

Among them, the hard impact-resistant layer 1 is made of high-strength, high-hardness, impact-resistant materials, such as hard ceramics, light alloys, and the like. In this embodiment, the hard impact-resistant layer 1 is made of hard ceramic; the ceramic is one of alumina, boron carbide or silicon carbide. Among them, boron carbide has the best performance in all aspects, so the hard impact-resistant layer in this embodiment is 1 Made of boron carbide ceramics. The strength of the boron carbide ceramic plate is very high, and it will be broken instantly when it is hit by a bullet. It relies on the cracks generated by the fragmentation to disperse the kinetic energy of the bullet.

The soft energy-absorbing layer 2 is selected from one of sponge, rubber and latex. Polyurethane soft foamed rubber, as a kind of sponge, is the most common polymer material in life. It has excellent energy absorption, shock absorption, Therefore, in this embodiment, the soft energy-absorbing layer 2 is preferably selected from polyurethane soft foamed rubber.

The inside of the soft energy-absorbing layer 2 is provided with a plurality of rows of first through holes 3. When subjected to an impact, compared with a bulletproof helmet without holes, the pores will be compressed and deformed and continuously squeeze the circumference of the holes, resulting in the soft energy-absorbing layer. 2 Deformation occurs, thereby offsetting the external impact force and reducing the damage to the human body.

Preferably, the first through hole 3 is a prism whose front and rear end faces are parallelograms, and the instability of the parallelogram is used here, which is conducive to large deformation. The shape of the end face of the first through hole 3 in this embodiment is preferably a regular parallelogram, and the side length of the regular parallelogram is 0.1 mm˜0.8 mm. The size of the first through hole 3 cannot be too large to prevent bullets from directly passing through the first through hole 3; however, it should not be too small, otherwise the shock absorption and energy absorption effect on the impact will not be achieved. In this embodiment, the side length dimension of the end face of the first through hole 3 is preferably 0.5 mm.

Specifically, the multiple rows of first through holes 3 are arranged in a gradient, that is, the multiple rows of first through holes 3 are arranged in a manner from sparse to dense to sparse from the outer side to the inner side of the soft energy absorbing layer 2, so as to realize soft The energy-absorbing layer 2 has a large deformation in the middle and a small deformation in the outside, which is conducive to material transition, and prevents the contact interface of heterogeneous materials from deforming too much and delamination. The distance between the upper and lower holes of the two adjacent first through holes 3 is 0.5mm-1mm. If the distance is too large, the deformation amount is small, the energy absorption effect becomes poor, the distance is too small, the hole wall is too thin, and the deformation amount is too large, which is easy to occur. Delamination between layers. In this embodiment, the distance between the upper and lower holes of two adjacent first through holes 3 is preferably 0.8 mm.

The composite layer 4 is based on a hard material, and multiple second through holes 5 staggered along the circumferential direction of the base body are opened, and the second through holes 5 are filled with flexible materials.

Preferably, the second through hole 5 is a rectangular parallelepiped whose front and rear end faces are square, and the side length of the square is 2 mm˜4 mm. In this embodiment, the side length dimension of the end face of the second through hole 5 is preferably 3 mm.

Preferably, the multi-layer second through holes 5 are arranged in a staggered manner along the circumferential direction of the composite layer 4 , so that the flexible materials in the second through holes 5 are arranged as much as possible in the thickness direction of the composite layer 4 , which is conducive to reducing energy absorption and reducing energy consumption. The distance between the upper and lower holes of two adjacent second through holes 5 is 0.5mm-1.5mm. If the spacing is too large, the proportion of flexible materials will be small, and the energy absorption effect will be poor. In this embodiment, the distance between the upper and lower holes of two adjacent second through holes 5 is preferably 1 mm.

Specifically, the hard material in the composite layer 4 can be selected from one of hard ceramics and hard alloys. Compared with hard alloys, hard ceramics have the characteristics of light weight and high strength, so hard ceramics are selected as hard materials. Among them, boron carbide has the best performance in all aspects, so the hard material is boron carbide ceramics.

The flexible material in the composite layer 4 is a viscoelastic material with excellent shock absorption performance, among which silicone rubber is a viscoelastic material with excellent shock absorption performance. The bond structure makes the mechanical properties more stable in a wide temperature range, the elastic modulus change is small, and the performance is relatively stable.

The inner lining layer 6 is made of shape memory polymer fibers, and shape memory polymer fibers (SMP) can be classified into: thermal type, electric type, photo-induced type, chemical induction type, etc. according to their recovery principle. According to the working conditions of the helmet, thermoplastic shape memory polymer fibers are selected in this embodiment. When the bullet hits the helmet, a part of the impact energy is converted into heat energy, which makes the temperature around the impact point rise rapidly. When it reaches the transformation temperature of the shape memory polymer fiber, it will return to the original set shape, bulge out near the impact point, away from the scalp, A cavity is formed, which is conducive to the spread of impact energy around the impact point of the helmet, reducing the impact force on the head.

The hard impact-resistant layer 1 , the soft energy-absorbing layer 2 , the composite layer 4 and the inner lining layer 6 are stacked in sequence, and the hard impact-resistant layer 1 , the soft energy-absorbing layer 2 , the composite layer 4 and the inner lining layer 6 fixed together.

Specifically, the adjacent interfaces of the hard impact-resistant layer 1, the soft energy-absorbing layer 2, the composite layer 4 and the inner lining layer 6 are connected by the structural adhesive epoxy-phenolic adhesive, and the adhesive is applied by brushing. Adhesive to ensure proper thickness.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still The technical solutions recorded in the foregoing embodiments may be modified, or some or all of the technical features thereof may be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention .

Claims (9)

1. A small dent impact-resistant bionic bulletproof helmet, characterized in that it comprises a hard impact-resistant layer (1), a soft energy-absorbing layer (2), and a composite layer (4) stacked in sequence from the outer layer to the inner layer , inner lining (6); The hard impact-resistant layer (1), the soft energy-absorbing layer (2), the composite layer (4) and the inner lining layer (6) are connected by means of adhesive bonding; The inside of the soft energy-absorbing layer (2) is provided with multiple rows of first through holes (3) along the circumferential direction, and the multiple rows of first through holes (3) are arranged in a gradient; Multiple rows of second through holes (5) are arranged inside the composite layer (4) along the circumferential direction, the multiple rows of second through holes (5) are staggered, and the second through holes (5) are filled with flexible materials; The composite layer (4) is based on a hard material, and the hard material is one of hard ceramics and hard alloys; the flexible material is a viscoelastic material. 2 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the hard impact-resistant layer ( 1 ) is made of one of hard ceramics and light alloys. 3 . 3 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the soft energy-absorbing layer ( 2 ) is made of one or more of sponge, rubber, and latex. 4 . 4 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the cross-section of the first through hole ( 3 ) is a regular parallelogram, and the side length of the regular parallelogram is 0.1 mm. ~0.8mm. 5 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the distance between the upper and lower holes of two adjacent first through holes ( 3 ) is 0.5 mm to 1 mm. 6 . 6 . The impact-resistant bionic bulletproof helmet of claim 1 , wherein the viscoelastic material is silicone rubber. 7 . 7 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the cross-section of the second through hole ( 5 ) is square, and the side length of the square is 2mm˜4mm. 8 . 8 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the distance between the upper and lower holes of the two adjacent second through holes ( 5 ) is 0.5 mm to 1.5 mm. 9 . 9 . The impact-resistant bionic bulletproof helmet with small depressions according to claim 1 , wherein the inner lining layer ( 6 ) is made of shape memory polymer fibers. 10 .

Images