CN114832359A - Negative Poisson ratio skiing sport protector suitable for two seasons of summer and winter under multiple scenes - Google Patents
Negative Poisson ratio skiing sport protector suitable for two seasons of summer and winter under multiple scenes Download PDFInfo
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- CN114832359A CN114832359A CN202210048682.8A CN202210048682A CN114832359A CN 114832359 A CN114832359 A CN 114832359A CN 202210048682 A CN202210048682 A CN 202210048682A CN 114832359 A CN114832359 A CN 114832359A
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
- A63B71/08—Body-protectors for players or sportsmen, i.e. body-protecting accessories affording protection of body parts against blows or collisions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/62—Stitching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/82—Testing the joint
- B29C65/8207—Testing the joint by mechanical methods
- B29C65/8238—Impact tests
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
- B32B3/04—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0261—Polyamide fibres
- B32B2262/0269—Aromatic polyamide fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2266/00—Composition of foam
- B32B2266/02—Organic
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- B32B2266/0221—Vinyl resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0278—Polyurethane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/56—Damping, energy absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2571/00—Protective equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the technical field of sports protection equipment, in particular to a negative Poisson ratio skiing sports protector suitable for being used in a multi-scene situation in summer and winter. The protective tool breaks through the traditional protective tool specification, the negative Poisson ratio structure is added into the buffer layer of the protective tool, the energy absorption performance of the protective tool is improved, and certain contribution is made to the light weight of the protective tool; the outer layer of the buffer layer of the protective tool is made of D3O composite material, so that the impact resistance of the protective tool is enhanced on the basis of high energy absorption; the outer layer wrapping material adopts Kevlar fiber needles with high strength and high wear resistance; an optimization model is established for specific working conditions, the optimization design of the shapes of materials and structural members is realized, the overall dimension parameterization is carried out on the shapes of the structural members made of the composite materials, and the degree of freedom of lightweight design is greatly improved; the impact load of the athlete in an accident is simulated by adopting a drop hammer impact test, and the impact resistance, the energy absorption performance and the safety of the protective tool are verified.
Description
Technical Field
The invention relates to the technical field of sports protection equipment, in particular to a negative Poisson ratio skiing sports protector suitable for being used in a multi-scene situation in two seasons of summer and winter.
Background
Dry snow is a continuous medium material with a typical super-elastic mechanical behavior, and is more likely to cause injury to athletes than powdered real snow. At present, a plurality of high-end ski protective equipment manufacturers exist abroad, and the protective pad of the protective equipment mainly adopts high-performance energy-absorbing buffer materials such as D3O, foamed rubber and high-density shock-absorbing sponge. Although the foreign high-end protective clothing has higher safety and comfort in a real snow environment, the protective performance of the protective clothing in a dry snow environment is still insufficient due to the lack of a variable-rigidity structural design of a structural hierarchy. The snow sports protective equipment in China mainly centers on the appearance design of low-end products, a high-end product industry chain is not formed, and the difference between the protective performance and the foreign high-end protective equipment is obvious. Under the application background, the invention provides a multi-level skiing protector with negative poisson ratio performance, which is suitable for skiing sports in two seasons and multiple scenes in summer and winter.
Disclosure of Invention
The invention mainly provides a lighter and more protective multi-layer skiing sport protector suitable for the dry snow environment in summer and winter under multiple scenes.
The technical scheme of the invention is as follows:
the utility model provides a negative poisson ratio skiing sport protective equipment suitable for in summer winter under two seasons, includes buffer layer 3 layers, and the inlayer is the EVA material, and the middle level is for using the 3D of polyurethane as the raw materials to print negative poisson ratio layer, and the skin is D3O combined material layer.
The D3O composite material is prepared from two components, namely A (D3O material) and B (polyurethane foam), and the material performance is verified by comparing DMA (dynamic mechanical analysis test).
The negative Poisson ratio layer is combined by adopting a single cell structure, the single cell structure is in a cross shape and is in an I shape, and the overall size of the single cell is not more than 6mm multiplied by 6 mm.
The negative Poisson ratio layer is sewn with the D3O layer, the buffer layer is wrapped by Kevlar fiber cloth, and anti-slip strips are arranged on one side close to the human body and fixed with the joints of the human body through adjustable bandages.
The Kevlar fiber wrapped by the outer layer of the protective clothing has high strength, high wear resistance and high tear resistance.
A preparation method of a negative Poisson ratio skiing sport protector suitable for being used in a multi-scene of two seasons in summer and winter comprises the following steps:
step 1: determining the number of layers of the multi-level protective equipment buffer layer to be 3, and respectively preparing a D3O composite material, a polyurethane material with a negative Poisson ratio performance and an EVA material from outside to inside for each layer of material.
Step 2: the D3O composite material is prepared from two components, namely A (D3O material) and B (polyurethane foam), and the material performance is verified by DMA (dynamic mechanical analysis test) in a comparison mode.
And step 3: and (3) performing a material standard tensile experiment test on the polyurethane material to obtain an elastic constant and a Poisson ratio.
And 4, step 4: designing a negative Poisson's ratio layer unit cell structure by considering a processing technology, establishing a mechanical model based on commercial finite element analysis software, parameterizing the size of the negative Poisson's ratio layer unit cell, establishing an optimization model for material characteristics and macroscopic structure design, and optimally designing a structural member.
And 5: and modifying the optimized component structure by combining a molding process, printing a polyurethane negative Poisson ratio layer of the protector by using a 3D printing technology, and sewing the negative Poisson ratio layer and the D3O layer.
Step 6: and performing a drop hammer impact test on the protective tool buffer layer to verify the impact resistance and the energy absorption effect of the protective tool.
And 7: the buffer layer is wrapped by Kevlar fiber cloth, and anti-slip strips are arranged on one side close to the human body and are fixed with the joints of the human body through adjustable bandages.
Preferably, the buffer layer of this supporter is 3 layers, and the inlayer is the EVA material, and the middle level is 3D that use polyurethane as raw materials prints the negative poisson's ratio layer, and the skin is D3O composite material layer.
Preferably, 3 kinds of unit cell structures with negative Poisson's ratio effect are designed, as shown in fig. 3(a), the unit cell and cavity size in the scheme 1 is small in process, the solution cannot be completely cleaned, and the cavity is difficult to form; in the scheme 2, the cavity is large and easy to form, so that the cavity is convenient to process and manufacture at the later stage and has a negative Poisson ratio effect; scheme 3 has a good negative poisson's ratio effect, but the cavity size is smaller and is difficult to process. Therefore, the unit cell structure of the protector is in a cross shape shown in scheme 2, and the whole size of the unit cell is not more than 6mm multiplied by 6 mm.
Preferably, the automated modeling analysis and result extraction is a parameterization program for secondary development of the structural member based on commercial finite element software, and the optimization model can be designed according to the load condition in the actual working condition of the project, and the optimization target and the constraints comprise the strength, the rigidity and the quality of the structural member.
Preferably, the negative poisson ratio layer of the protector is prepared by taking polyurethane as a raw material and considering the difficulty of unit cell processing based on a 3D printing technology, so that the cavity with the unit cell structure is easier to form on the premise of ensuring the negative poisson ratio characteristic.
Preferably, in the drop hammer impact test, 5.5Kg of drop hammer is placed at a height of 0.45m, and a free falling body test is carried out to verify the impact energy absorption effect.
Compared with the existing protective clothing, the protective clothing has the following advantages:
the invention discloses a multi-level skiing protector with negative Poisson ratio performance, which is suitable for skiing sports in two seasons and multiple scenes in summer and winter, breaks through the specification of the traditional protector, adds a negative Poisson ratio structure into a buffer layer of the protector, improves the energy absorption performance of the protector, and makes certain contribution to the light weight of the protector; the outer layer of the buffer layer of the protective tool is made of D3O composite material, so that the impact resistance of the protective tool is enhanced on the basis of high energy absorption; the outer layer wrapping material adopts Kevlar fiber needles with high strength and high wear resistance; an optimization model is established for specific working conditions, the optimization design of the shapes of materials and structural members is realized, the overall dimension parameterization is carried out on the shapes of the structural members made of the composite materials, and the degree of freedom of lightweight design is greatly improved; the impact load of the athlete in an accident is simulated by adopting a drop hammer impact test, and the impact resistance, the energy absorption performance and the safety of the protective tool are verified. The invention provides a multi-level sport protector with high impact resistance and high energy absorption for the fields of skiing and other extreme sports, is lighter than the traditional protector, and ensures the safety of athletes to a considerable extent.
Drawings
FIG. 1 is a schematic view of the knee pad and elbow pad in layered form;
FIG. 2 is a standard tensile curve of a polyurethane material;
FIG. 3(a) is a schematic diagram of a unit cell structure design scheme of a negative Poisson ratio layer of a protector;
FIG. 3(b) is a schematic view of the overall structure of the negative Poisson ratio of the protector;
fig. 4 is a brace optimization framework schematic.
Detailed Description
For a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken together with the accompanying figures.
1) As shown in fig. 1, the protective clothing mainly comprises a buffer layer (a negative poisson ratio structure layer, a D3O layer), the negative poisson ratio structure layer has high energy absorption performance, the protective clothing is located near one side of a human joint, the D3O layer has strong impact resistance, the protective clothing is located at the outer layer of the negative poisson ratio structure layer, the two layers of structures are connected through sewing, an outer layer wrapping material is Kevlar cloth, an anti-slip strip is attached to one side close to the human joint, the protective clothing is prevented from sliding in the process of movement, the protection effect cannot be achieved, an adjusting bandage is arranged at one side far away from the human joint, and the protective clothing is suitable for athletes of different ages and different sexes.
2) The D3O material added with 20% of PFU (polyurethane foam) and a pure polyurethane material are subjected to DMA (dynamic mechanical analysis) test, the storage modulus and the loss modulus are greatly improved, and are improved by more than 50% at high frequency, which shows that the composite material has stronger energy absorption and shock absorption effects under high-speed impact, and the specific parameters are shown in the following table.
Table 1 PFU D3O composite DMA test
3) And (3) performing a standard tensile experiment to perform a material basic mechanical property test to obtain an elastic constant and a Poisson ratio, wherein as shown in a standard tensile curve of the polyurethane material in fig. 2, the obtained polyurethane has a tensile elastic modulus of 5.00MPa and a Poisson ratio of 0.33. The D3O material has different mechanical properties under different strain rates due to its characteristics.
4) And establishing a finite element model of the protective equipment negative Poisson ratio structure layer, wherein the negative Poisson ratio structure layer is made of polyurethane.
5) And (3) parameterizing the overall dimension of the unit cell of the negative Poisson ratio mechanism based on a parametric analysis program of a commercial finite element software secondary development structural part, performing uniaxial static compression on the overall structure, and observing the negative Poisson ratio effect and the stress-strain change characteristics of the overall structure.
6) Aiming at a designed single cell structure, the thickness (2-6 mm) of a negative Poisson ratio material single cell is taken as a design variable, the peak value of an acting force on a human body protection part under the specified impact action does not exceed a safety acting force and is taken as a constraint condition, and the optimal design with the minimum thickness of the negative Poisson ratio material is developed on the premise of high energy absorption. The optimization block diagram is shown in fig. 4.
7) The optimized component configuration is modified in combination with the molding process as shown in fig. 3, and finally the structural component is prepared.
8) The drop hammer impact test is carried out, the drop hammer mass is 5.5Kg, the drop hammer height is 0.45m, and compared with some protective tool buffer layers in the market, the buffer layer of the invention has the smallest peak impact force, and the buffer layer is not damaged, and the test results are shown in the following table.
TABLE 2 drop hammer impact test
Claims (6)
1. The protective clothing for the skiing sports with the negative Poisson ratio in summer and winter under multiple scenes is characterized by comprising a buffer layer 3, wherein the inner layer is made of EVA (ethylene vinyl acetate copolymer) material, the middle layer is a 3D printing negative Poisson ratio layer made of polyurethane, and the outer layer is a D3O composite material layer;
the D3O composite material is prepared from two components of a D3O material and polyurethane foam;
the negative Poisson ratio layer is combined by adopting a single cell structure, the single cell structure is in a cross shape and is in an I shape, and the overall size of the single cell is not more than 6mm multiplied by 6 mm;
the negative Poisson ratio layer is sewn with the D3O layer, the buffer layer is wrapped by Kevlar fiber cloth, and anti-slip strips are arranged on one side close to the human body and fixed with the joints of the human body through adjustable bandages.
2. The negative poisson's ratio ski protector of claim 1 where the kevlar fiber has high strength, high abrasion resistance, and high tear resistance.
3. The method for preparing a negative poisson ratio skiing sport protector suitable for two seasons and multiple scenes in summer and winter according to claim 1 or 2, wherein the steps are as follows:
step 1: determining the number of layers of a multi-level protective equipment buffer layer to be 3, determining each layer of material from outside to inside to be D3O composite material, and determining the middle layer to be a 3D printing negative Poisson's ratio layer and an EVA material which take polyurethane as raw materials;
step 2: the D3O composite material is prepared from two components, namely a D3O material and polyurethane foam, and the performance of the material is contrasted and verified through DMA (dynamic mechanical analysis test);
and step 3: performing a material standard tensile experiment test on the polyurethane material to obtain an elastic constant and a Poisson ratio;
and 4, step 4: designing a negative poisson ratio layer unit cell structure by considering a processing technology, establishing a mechanical model based on commercial finite element analysis software, parameterizing the size of the negative poisson ratio layer unit cell, establishing an optimization model for material characteristic and macroscopic structure design, and optimally designing a structural member;
and 5: modifying the optimized component structure by combining a forming process, printing a polyurethane negative Poisson ratio layer of the protector by using a 3D printing technology, and sewing the negative Poisson ratio layer and the D3O layer;
step 6: performing a drop hammer impact test on the protective tool buffer layer to verify the impact resistance and the energy absorption effect of the protective tool;
and 7: the buffer layer is wrapped by Kevlar fiber cloth, and anti-slip strips are arranged on one side close to the human body and are fixed with the joints of the human body through adjustable bandages.
4. The method of claim 3 wherein the negative Poisson ratio layer is assembled using a single cell structure, the single cell structure is in the cross shape of an I, and the overall size of the single cell is no greater than 6mm x 6 mm.
5. The method of claim 3 wherein in step 4, the structural member is optimally designed, wherein the optimization goals and constraints include strength, rigidity and mass of the structural member.
6. The method for preparing a negative Poisson ratio ski sport protector suitable for two seasons and multiple scenes in summer and winter as claimed in claim 3, wherein in step 6, 5.5Kg of drop hammer is placed at a height of 0.45m for a drop hammer impact test to verify the impact energy absorption effect through a free fall test.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210048682.8A CN114832359B (en) | 2022-01-17 | 2022-01-17 | Negative poisson ratio skiing sports protective equipment suitable for multi-scene in summer and winter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210048682.8A CN114832359B (en) | 2022-01-17 | 2022-01-17 | Negative poisson ratio skiing sports protective equipment suitable for multi-scene in summer and winter |
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| CN114832359A true CN114832359A (en) | 2022-08-02 |
| CN114832359B CN114832359B (en) | 2023-09-19 |
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