Composite bulletproof helmet with auxetic structure and preparation method of composite bulletproof helmet

Abstract

The invention discloses a composite bulletproof helmet with an auxetic structure and a preparation method of the composite bulletproof helmet, and relates to the technical field of individual protection equipment. According to the scheme, the composite bulletproof helmet comprises a composite bulletproof helmet body, the composite bulletproof helmet body comprises an outer helmet face, an STF face and a gradient foaming face which are sequentially arranged in a stacked mode from outside to inside, and a connecting structure for connecting all the functional faces; the connecting structure comprises a divergent dispensing face which is arranged between the outer helmet face and the STF face and corresponds to the top area of the STF face, and at least one elastic connecting band corresponding to the side face area of the STF face. And the packaging bag body is arranged between the STF surface and the gradient foaming surface. The step-by-step and cooperative dissipation of impact energy in three levels of structural deformation, material phase change and buffering energy absorption is realized, and the protection efficiency is systematically improved.

Description

Technical Field

[0001] This invention relates to the field of personal protective equipment technology, and in particular to a composite bulletproof helmet with a tensile structure and its manufacturing method. Background Technology

[0002] Bulletproof helmets are key equipment for protecting the human head. The protective performance of bulletproof helmets mainly depends on their efficiency in absorbing and dissipating impact energy. Traditional bulletproof helmets are mostly made of high-performance fiber laminates, such as aramid and ultra-high molecular weight polyethylene. Although they have a certain bulletproof capability, they still have the following limitations: the traditional laminate structure mainly relies on fiber tensile fracture to absorb energy under projectile impact, resulting in a large local bulge behind the impact point, which can easily cause blunt trauma to the wearer's head. In order to improve performance, there have been attempts to introduce various functional materials into helmet design, such as shear thickening fluid and negative Poisson's ratio structure. However, these improvements are mostly limited to the simple superposition or replacement of materials. There are obvious deficiencies in the overall structural design, especially in the mechanical connection and energy transfer path planning between functional layers. For example, existing composite helmets often use full-surface bonding or simple stitching between the layers. This fixed connection method results in a uniform distribution of overall helmet stiffness, which cannot adapt to impacts of different angles and intensities. When subjected to non-frontal impacts, the layers cannot absorb and convert energy through controllable relative movement, which can easily transfer excessive torsional loads to the wearer's neck, increasing the risk of injury. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to solve the above-mentioned problems.

[0004] To achieve the above-mentioned technical objectives, the present invention provides a composite bulletproof helmet with a tensile structure, comprising a composite bulletproof helmet, which includes an outer helmet surface, an STF surface, and a gradient foam surface stacked sequentially from the outside to the inside, as well as a connecting structure connecting the functional surfaces; the connecting structure includes: At least one elastic connecting strip is disposed between the outer helmet surface and the STF surface, corresponding to the top area of ​​the STF surface; The encapsulation capsule is disposed between the STF surface and the gradient foaming surface.

[0005] Preferably, the encapsulation capsule includes a plurality of easily breakable encapsulation capsules pre-embedded in the gradient foaming surface on the side near the STF surface, and the easily breakable encapsulation capsule consists of a capsule shell and a highly lubricating medium encapsulated inside it.

[0006] Preferably, the easily breakable encapsulated capsule located in the top area of ​​the helmet constitutes a top connector, and the easily breakable encapsulated capsule located in the side and rear areas of the helmet constitutes a side connector.

[0007] Preferably, the elastic connecting strip is made of thermoplastic polyurethane or silicone rubber.

[0008] Preferably, the adhesive layer of the radiating point adhesive surface is distributed in a radial or grid pattern radiating outward from the preset point.

[0009] Preferably, the outer helmet surface is formed by connecting fabric portions with different negative Poisson's ratio structural units through a splicing frame, wherein the fabric portions include at least a first fabric portion having a concave hexagonal structural unit and a second fabric portion having a rotating square structural unit.

[0010] Preferably, the STF surface includes a high-proportion STF fabric corresponding to the first fabric portion in the projection area, and a low-proportion STF fabric corresponding to the second fabric portion in the projection area, wherein the STF impregnation mass fraction of the high-proportion STF fabric is higher than that of the low-proportion STF fabric.

[0011] Preferably, the porosity of the gradient foamed surface decreases continuously from its inner side to its outer side.

[0012] Preferably, the outer periphery of the composite bulletproof helmet is covered with a fixed edging.

[0013] A method for manufacturing a composite bulletproof helmet with a tensile structure, applicable to the aforementioned composite bulletproof helmet with a tensile structure, includes the following steps: The outer helmet surface, STF surface, and gradient foam surface with integrated encapsulation capsule were prepared separately; The outer helmet surface is connected to the STF surface using a diverging adhesive surface and an elastic connecting strip; Assemble the connected outer helmet surface and STF surface with the gradient foam surface, so that the encapsulation capsule is located between the STF surface and the gradient foam surface; The assembled parts are then heat-pressed and cured to form a single helmet shell. The helmet shell is edged and post-processed.

[0014] As can be seen from the above technical solutions, this application has the following beneficial effects: 1. By constructing a composite system with a negative Poisson's ratio structural layer as the outer helmet surface, an STF functional enhancement layer as the STF surface, and a gradient buffer layer as the gradient foaming surface, the impact energy is dissipated stepwise and synergistically at three levels: structural deformation, material phase change, and buffer energy absorption, thus systematically improving the protection efficiency. 2. The elastic connecting strips on the sides of the outer helmet surface and the STF surface allow for limited displacement of the outer layer, absorbing some of the impact kinetic energy and reducing the risk of neck sprains; 3. The STF surface and the gradient foam surface are connected by an encapsulated capsule, which is triggered when the helmet is hit from the side. The energy is further dissipated through controllable sliding, which improves the helmet's adaptability to multi-angle impacts. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This invention provides an overall structural schematic diagram of a composite bulletproof helmet with a tensile structure. Figure 2 An explosive structure diagram of a composite bulletproof helmet with a tensile structure provided by the present invention; Figure 3 A schematic diagram of the explosive structure of the outer surface of a composite bulletproof helmet with a tensile structure provided by the present invention; Figure 4 A schematic diagram of the cross-sectional structure of the fabric portion of a composite bulletproof helmet with a tensile structure provided by the present invention; Figure 5 A schematic diagram of the STF surface cross-sectional structure of a composite bulletproof helmet with a tensile structure provided by the present invention; Figure 6 A schematic diagram of a partial cross-sectional explosion structure of a gradient foamed surface of a composite bulletproof helmet with a tensile structure provided by the present invention; Figure 7 This is a schematic flowchart illustrating a method for manufacturing a composite bulletproof helmet with a tensile structure, as provided by the present invention. Attached image description: 100. Composite bulletproof helmet; 10. Outer helmet visor; 11. Joint frame; 12. Fabric section; 121. Concave hexagonal structural layer; 122. Rotated square structural layer; 20. STF surface; 21. Low-proportion STF fabric; 22. High-proportion STF fabric; 30. Gradient foaming surface; 31. Dense portion; 32. Loose-dense portion; 33. Loose-dense portion; 40. Diverging point adhesive surface; 50. Encapsulation capsule; 51. Top connector; 52. Side connector; 60. Elastic connecting belt; 70. Fix the edging. Detailed Implementation

[0018] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0019] Example 1, see Figures 1-6 As shown, a composite bulletproof helmet with a tensile structure includes a composite bulletproof helmet 100. The composite bulletproof helmet 100 includes an outer helmet surface 10 as the main body of structural response, an STF surface 20 as the core of material reinforcement, and a gradient foam surface 30 as the final cushioning and comfort layer. The layers are connected by a diverging point adhesive surface 40, an elastic connecting strip 60 and an encapsulation capsule 50, and the whole is encapsulated by a fixed edge wrapping 70.

[0020] Specifically, the outer helmet surface 10 is composed of a multifaceted fabric section 12 connected by a splicing frame 11. The fabric section 12 is composed of a concave hexagonal structural layer 121 and a rotating square structural layer 122. The concave hexagonal structural layer 121 and the rotating square structural layer 122 are spliced ​​or stacked horizontally. Horizontal splicing methods include the top of the composite bulletproof helmet 100 being covered with a concave hexagonal structural layer 121, and the sides and rear of the composite bulletproof helmet 100 being covered with a rotating square structural layer 122. In some embodiments, the stacking method consists of a fully covered concave hexagonal structure layer 121 and a fully covered rotating square structure layer 122 stacked and bonded together. This design allows any point of impact to simultaneously trigger a synergistic response of the two mechanisms.

[0021] Furthermore, both the concave hexagonal structural layer 121 and the rotating square structural layer 122 are preferably made of ultra-high molecular weight polyethylene fiber or para-aramid fiber, and are woven into a fabric with obvious three-dimensional spacer structure by double needle bed warp knitting process, with a Poisson's ratio of less than 0.3.

[0022] Among them, the concave hexagonal structure of the concave hexagonal structure layer 121 plays an active densification role. When the projectile impacts this area, the concave edge of the concave hexagonal structure is forced to flip outward and straighten under the action of compressive force. This movement causes the size of the concave hexagonal structure to shrink on the surface perpendicular to the impact direction, thereby driving the units around this surface to gather towards the impact center point, that is, the in-plane centripetal contraction effect, which rapidly reduces the fiber gap near the impact point and instantly increases the local surface density and thickness, thus achieving active resistance to penetration from the structural level. The rotating square structure of the rotating square structure layer 122 has a highly efficient diffusion effect. When the impact energy is transferred to the rotating square structure layer 122, the weaving effect of the rotating square causes the impact point to rotate and deform. This deformation mode can effectively conduct the stress wave along the unit network to a wider area, just like spreading ripples, avoiding the accumulation of energy in a local area and reducing the risk of overall deformation and back depression.

[0023] More specifically, the splicing frame 11 is a connecting transition zone integrally formed during weaving, with a width of 10-30mm. This transition zone uses high-performance fibers of the same material as the adjacent fabric section 12, and by changing the weaving structure of this area, it forms a transition zone where the structural unit gradually changes from a concave hexagon to a rotating square, or forms a special transition structural unit that combines connection and tensile properties. This ensures the continuous change of mechanical properties between different performance areas on the outer helmet surface 10, avoiding stress concentration and weak points caused by abrupt structural changes. Specifically, this is achieved at the junction of the multifaceted fabric sections 12. A transition zone in weaving is formed by changing the direction of the yarn, the weft insertion, and the connection method. For example, in the weaving process, the jacquard and warp feeding mechanisms of the warp knitting machine are programmed to plan a transition zone with a width of about 1-3 cm in the junction area of ​​the multifaceted fabric section 12. In this strip-shaped area, the weaving program controls the yarn to make the structural unit formed gradually evolve from a pure "concave hexagon" to a pure "rotating square". For example, the concave angle of the unit changes gradually, and the length of the connecting rod is adjusted gradually. In this way, the Poisson's ratio and stiffness of the material achieve a smooth transition in this area, eliminating abrupt changes in performance.

[0024] The STF fabric 20 is tightly bonded to the inner side of the outer helmet veneer 10. Its function is to introduce the dynamic response characteristics of the material and form a synergistic locking with the outer helmet veneer 10. Specifically, the STF fabric 20 has a partitioned structure, consisting of a high proportion of STF fabric 22 and a low proportion of STF fabric 21. Its partitioned design is intended to coordinate with the protective functional partitioning of the outer helmet veneer 10: that is, in areas where the impact core densification function is required, a high proportion of STF fabric 22 is configured; in areas where the lateral energy diffusion function is required, a low proportion of STF fabric 21 is configured. More specifically, when the outer helmet surface 10 is spliced, it is composed of a high-proportion STF fabric 22 and a low-proportion STF fabric 21, with the splicing boundary corresponding to the functional area of ​​the upper fabric in projection. When the outer helmet surface 10 is laminated, the STF surface 20 is preferably designed as a concentration gradient material, with its STF concentration distribution matching the functional requirements of the laminated structure, for example, having a higher STF concentration in the thickness direction corresponding to the impact core area.

[0025] Both the high-proportion STF fabric 22 and the low-proportion STF fabric 21 use high-performance fibers, plain weave or unidirectional fabric as the base material, and are impregnated in shear thickening liquid of different mass fractions, and then dried and cured. The shear thickening liquid is STF, which will be described as STF below. It is worth mentioning that, among them, the STF content of the high-proportion STF fabric 22 accounts for 35%-45% of the weight of the substrate, and the STF content of the low-proportion STF fabric 21 accounts for 15%-25% of the weight of the substrate. The STF is made by dispersing nano-sized silica particles in polyethylene glycol.

[0026] For example, at the moment of projectile impact, the STF surface 20 is subjected to an extremely high shear rate. The STF inside it changes from a liquid state to a near-solid state within milliseconds. This rapid thickening and solidification phase change effect produces a dual effect: the solidified STF greatly restricts the slippage between fiber bundles, causing a sharp increase in the overall stiffness of the substrate; and at the moment of projectile impact, the impact load acts simultaneously on the outer helmet surface 10 and the STF surface 20 of the composite structure. The negative Poisson's ratio structure in the outer helmet surface 10 begins to undergo the aforementioned densification or diffusion deformation; at the same time, the shear thickening liquid in the STF surface 20 undergoes an instantaneous phase change solidification due to the extremely high shear rate. The solidified STF greatly enhances the stiffness of the fabric matrix. This enhancement effect is synchronized with the structural deformation process of the adjacent outer helmet surface 10, thereby effectively locking the deformation mode of the negative Poisson's ratio structure and preventing its rebound or instability after deformation. The partitioned impregnation design ensures that the STF provides a stronger locking and enhancement effect in high-energy-consuming areas such as the impact core area.

[0027] Furthermore, the gradient foam surface 30 is located in the innermost layer, directly conforming to the wearer's head and providing comfortable final cushioning. The gradient foam surface 30 is a one-piece molded foam material, such as polyurethane foam or EVA foam. Its key feature is that the porosity continuously decreases from the inside, i.e. the side close to the head, to the outside. For ease of description, it can be conceptually divided along its thickness direction into: a loose and dense part 33 with high porosity, a sparse and dense part 32 with medium porosity, and a dense part 31 with low porosity. For example, the continuous porosity gradient brings a smooth transition of the buffer modulus. When the residual impact energy dissipated by the first two layers is transferred to this layer, the harder dense part 31 first receives and further disperses the stress, and then the force is transferred to the softest, most porous part 33 through the loose part 32. This design avoids the stress concentration or interface delamination problems that may occur in traditional single-density foam or simple multi-layer foam. It can achieve the final absorption of energy with minimal back protrusion depth and head pressure, greatly improving wearing comfort and blunt force trauma prevention.

[0028] Furthermore, the outer helmet surface 10 and the STF surface 20 are bonded together by a diverging point adhesive surface 40. The adhesive surface 40 is formed by applying and curing epoxy resin structural adhesive in a radial or grid-like path radiating from the preset impact center to the periphery. The preset impact center, i.e. the preset point, is determined by those skilled in the art based on simulated impact experiments and is not specifically limited here. The purpose is that this connection method not only provides extremely high peel and shear strength, ensuring that the impact force can be efficiently transferred from the structural layer to the functional layer, but its diverging adhesive path shape also helps to guide the stress wave to diffuse outward.

[0029] Elastic connecting strips 60 are located on the side of the helmet, connecting the outer helmet surface 10 and the STF surface 20. The elastic connecting strips 60 are made of high elongation TPU or silicone rubber. The purpose is to allow limited relative shear displacement between the outer helmet surface 10 and the STF surface 20 and the stretching deformation of the elastic strip itself when subjected to non-frontal impact, thereby absorbing part of the impact energy and effectively reducing the head rotation acceleration caused by the impact, thus reducing the risk of neck injury.

[0030] The encapsulation capsule 50 is a shear force triggered lubrication system. The system consists of a dense portion 31 embedded on the outer surface of the gradient foaming surface 30. The encapsulation capsule 50 includes a top connector 51 and multiple side connectors 52. The top connector 51 and multiple side connectors 52 are all fracturing encapsulation capsules. The fracturing encapsulation capsule consists of a capsule shell and a highly lubricating medium encapsulated inside it. Specifically, the fracturing encapsulation capsule is a brittle polymer, such as modified gelatin or brittle polyurethane, and the highly lubricating medium is such as silicone oil or fluorinated fluid.

[0031] The top connector 51 and multiple side connectors 52 are arranged between the STF surface 20 and the gradient foam surface 30. When the composite bulletproof helmet 100 is impacted, the shear force generated between the STF surface 20 and the gradient foam surface 30 will cause the top connector 51 or multiple side connectors 52 to break, depending on the impact point. The released lubricating material immediately forms a local lubricating film between the STF surface 20 and the gradient foam surface 30. The purpose is that the formation of the lubricating film allows the gradient foam surface 30 to slip slightly relative to the STF surface 20. This slip process converts part of the impact kinetic energy into work to overcome the viscous resistance of the lubricating film and dissipates it in the form of heat. At the same time, it significantly reduces the peak force transmitted to the head by prolonging the buffering time. It should be noted that the fragility standard of the shell is based on the impact of shrapnel on the composite bulletproof helmet 100. The specific standard is set by those skilled in the art after simulation in the experimental environment and is not specifically limited here.

[0032] Specifically, after the helmet shell is formed, all its exposed edges are fixed by a fixing edging 70. The fixing edging 70 is preferably made of wear-resistant and flexible TPU or rubber material, and is fixed by hot pressing or adhesive bonding, which plays a role in protecting the internal structure and preventing delamination.

[0033] Example 2, see Figure 7 As shown in the above embodiments, a method for manufacturing a composite bulletproof helmet with a tensile structure includes the following steps: S1. Preparation of outer helmet surface 10: Weave concave hexagonal and rotating square three-dimensional negative Poisson's ratio fabric blanks respectively, cut them according to the helmet pattern, and then splice them together along the splicing frame 11 path by ultrasonic welding to form a complete curved surface layer; S2. Preparation of STF surface 20: Prepare two concentrations of STF, high and low, impregnate the corresponding substrates in sections, roll them in, dry them, cut them into sheets corresponding to the outer helmet surface 10, and splice them together; S3. Preparation of gradient foaming surface 30 and integrated encapsulation capsule 50: The encapsulation capsule 50 is pre-set in the foaming mold, the gradient foam is integrally formed by gradient foaming process, and the capsule is embedded in its outer surface. S4. Interlayer assembly: Align the outer helmet surface 10 with the STF surface 20, apply a divergent structural adhesive to the top area to form a dotted adhesive surface 40, and attach elastic connecting strips 60 at intervals in the side area; combine the gradient foam surface 30 with the bladder side facing outwards with the STF surface 20. S5. Overall curing and molding: The assembly is placed into the helmet mold and cured by temperature and pressure hot pressing. It is pre-pressed at 80℃ / 0.5MPa for 30 minutes, fully cured at 120℃ / 2MPa for 60 minutes, and stress released at 60℃ normal pressure for 30 minutes. S6. Post-processing: Trim the edges after demolding and install the fixed edge banding at 70°.

[0034] More specifically, the method for preparing the outer helmet surface 10 includes: using a double needle bed warp knitting machine, two types of three-dimensional spaced fabric blanks with negative Poisson's ratio effects are woven from ultra-high molecular weight polyethylene or filaments. The first type of blank has a concave hexagonal structural unit corresponding to the first fabric part 121, and the second type of blank has a rotating square structural unit corresponding to the second fabric part 122. According to the three-dimensional digital model of the helmet, the two types of blanks are cut into the designed shapes and quantities. Using ultrasonic welding equipment, the first fabric part 121 and the second fabric part 122 are spliced ​​on the three-dimensional curved surface along the preset splicing frame 11 path to form a complete outer helmet surface 10 blank that conforms to the shape of the helmet.

[0035] The method for preparing STF fabric 20 specifically includes: preparing two concentrations of shear thickening liquid, wherein the high-concentration STF is prepared by uniformly dispersing 40% by mass of nano-silica particles in polyethylene glycol, followed by high-speed stirring and ultrasonic treatment to prepare a low-concentration shear thickening liquid, and dispersing 25% by mass of nano-silica particles in polyethylene glycol in the same way; impregnating the substrate corresponding to the impact core area of ​​the outer helmet surface 10 in the high-concentration STF, and impregnating the substrate corresponding to the diffusion area in the low-concentration STF; using a vacuum-assisted impregnation process to ensure that the STF fully penetrates into the fiber bundle; controlling the liquid amount of the impregnated fabric with rollers, and then drying it in an oven at 80°C for 2 hours to remove excess solvent, obtaining a high-proportion STF fabric 22 and a low-proportion STF fabric 21; cutting the treated high-proportion STF fabric 22 and low-proportion STF fabric 21 into shapes corresponding to the areas of the outer helmet surface 10, and splicing them together to form a complete STF fabric 20 blank.

[0036] More specifically, polyurethane prepolymer, foaming agent, and catalyst are mixed and placed in specific locations in the helmet liner mold to pre-place the aforementioned capsules. Capsules 51 are placed in the top area and capsules 52 are placed in the side areas. Foaming is performed using a gradient temperature field. A lower temperature is set inside the mold, close to the head, to obtain high porosity, while a higher temperature is set outside the mold to obtain low porosity. After foaming, a gradient foamed surface 30 is obtained where the porosity continuously decreases from the inside to the outside, and the outer surface, i.e., the dense part 31, is embedded with capsules.

[0037] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A composite bulletproof helmet with a tensile structure, comprising a composite bulletproof helmet (100), characterized in that, The composite bulletproof helmet (100) includes an outer helmet surface (10), an STF surface (20), and a gradient foam surface (30) stacked sequentially from the outside to the inside, as well as a connecting structure connecting the functional surfaces; the connecting structure includes: A radiating adhesive surface (40) is disposed between the outer helmet surface (10) and the STF surface (20), corresponding to the top area of ​​the STF surface (20), and at least one elastic connecting strip (60) corresponds to the side area of ​​the STF surface (20). The encapsulation capsule (50) is disposed between the STF surface (20) and the gradient foaming surface (30).

2. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The encapsulation capsule (50) includes a plurality of easily breakable encapsulation capsules embedded in the side of the gradient foaming surface (30) near the STF surface (20). The easily breakable encapsulation capsules consist of a capsule shell and a highly lubricating medium encapsulated therein.

3. A composite bulletproof helmet with a tensile structure according to claim 2, characterized in that, The easily breakable encapsulated capsule located in the top area of ​​the helmet constitutes the top connector (51), and the easily breakable encapsulated capsule located in the side and rear areas of the helmet constitutes the side connector (52).

4. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The elastic connecting strip (60) is made of thermoplastic polyurethane or silicone rubber.

5. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The adhesive layer of the radiating point adhesive surface (40) is distributed in a radial or grid pattern radiating outward from the preset point.

6. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The outer helmet surface (10) is formed by connecting fabric portions (12) with different negative Poisson ratio structural units through splicing frame (11). The fabric portions (12) include at least a first fabric portion (121) with concave hexagonal structural units and a second fabric portion (122) with rotating square structural units.

7. A composite bulletproof helmet with a tensile structure according to claim 6, characterized in that, The STF surface (20) includes a high-proportion STF fabric (22) corresponding to the first fabric portion (121) in the projection area, and a low-proportion STF fabric (21) corresponding to the second fabric portion (122) in the projection area, wherein the STF impregnation mass fraction of the high-proportion STF fabric (22) is higher than that of the low-proportion STF fabric (21).

8. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The porosity of the gradient foamed surface (30) decreases continuously from its inner side to its outer side.

9. A composite bulletproof helmet with a tensile structure according to claim 1, characterized in that, The outer periphery of the composite bulletproof helmet (100) is covered with a fixed edge (70).

10. A method for manufacturing a composite bulletproof helmet with a tensile structure, applicable to the composite bulletproof helmet with a tensile structure as described in any one of claims 1-9, characterized in that, Includes the following steps: Prepare the outer helmet surface (10), STF surface (20), and gradient foam surface (30) that integrates the encapsulation capsule (50) respectively. The outer helmet surface (10) and the STF surface (20) are connected by a diverging adhesive surface (40) and an elastic connecting strip (60); Assemble the connected outer helmet surface (10) and STF surface (20) with the gradient foam surface (30) so that the encapsulation capsule (50) is located between the STF surface (20) and the gradient foam surface (30); The assembled parts are then heat-pressed and cured to form a single helmet shell. The helmet shell is edged and post-processed.

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