CN113650374A - Ship side flexible anti-fragment penetration layer and manufacturing method thereof - Google Patents
Ship side flexible anti-fragment penetration layer and manufacturing method thereof Download PDFInfo
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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
- B32B5/22—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
- B32B5/26—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 also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B59/00—Hull protection specially adapted for vessels; Cleaning devices specially adapted for vessels
- B63B59/02—Fenders integral with waterborne vessels or specially adapted therefor, e.g. fenders forming part of the hull or incorporated in the hull; Rubbing-strakes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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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
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
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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
- B32B2255/00—Coating on the layer surface
- B32B2255/02—Coating on the layer surface on 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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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
- B32B2605/00—Vehicles
- B32B2605/12—Ships
Abstract
The invention discloses a flexible anti-fragment penetration layer for a ship side and a manufacturing method thereof, and belongs to the field of ship side protection. The invention adopts the alternative distribution of the glass fiber gridding cloth layer and the polyurea layer. The thickness of the polyurea layer is k times of the glass fiber gridding cloth layer. The glass fiber mesh cloth layer and the polyurea layer can play a role in preventing fragment penetration; the composite material of the polyurea and the glass fiber grid cloth is utilized to improve the protection effect of the ship side, strengthen the protection of the side liquid tank on the fragment penetration, and reduce the fragment kinetic energy; when the flexible penetration-resistant layer is exploded outside, the reliability and safety of ship side protection are effectively improved, the empty cabin-liquid cabin-empty cabin are protected from being damaged, and the maintenance cost of the ship is reduced; the glass fiber mesh cloth layer is also used for attenuating the incident speed and has the function of high temperature resistance; the polyurea layer is also used for slowing down the impact of fragments, plays a small amount of kinetic energy absorption roles, and reduces the thickness and the cost of the protective coating while improving the protective capability.
Description
Technical Field
The invention relates to a flexible anti-fragment penetration layer for a ship side and a manufacturing method thereof, belonging to the field of ship side protection.
Background
Although a large-sized water surface ship has outstanding fighting capacity, the ship has fatal weakness, and the ship side is a critical part for anti-ship missile attack, so the ship needs to effectively protect the important cabin on the side. At present, a large-scale surface ship mostly adopts a multilayer plate frame side protection structure, namely an empty cabin-liquid cabin-empty cabin protection structure, wherein the liquid cabin is used for rapidly absorbing fragments generated after the blast of a warhead and secondary fragments generated by the fracture of an outer plate by utilizing a water layer in the liquid cabin. Therefore, a flexible penetration-resistant layer is added on the outer plate of the liquid tank, and penetration of fragments can be prevented when explosion happens on the outside. The reliability and the safety of ship side protection can be effectively improved. The empty cabin-liquid cabin-empty cabin can be effectively protected from being damaged, so that the maintenance cost of the ship after explosion is reduced. Polyurea as a typical high polymer elastic material has the characteristics of high elastic modulus, high tensile strength, high ductility and good impact resistance compared with other high polymer elastic materials. Generally, the thicker the polyurea coating, the better the impact mechanical property of the structure is, but the method of simply increasing the thickness of the polyurea coating to improve the impact mechanical property of the structure is somewhat impractical due to the price and practical operation. Meanwhile, various design parameters are also required to be determined in the design process, and the processing convenience is ensured, so that a targeted flexible protective layer design method is required.
Disclosure of Invention
In order to improve the anti-fragment penetration capability of the ship side, the flexible anti-fragment penetration layer of the ship side disclosed by the invention has the anti-fragment penetration effect, so that the protection effect on an empty cabin-liquid cabin-empty cabin protection structure can be realized, the ship structure is effectively protected from being damaged after explosion, the protection performance of the ship side is improved, the reliability of a ship is ensured, and in addition, the subsequent maintenance cost can be reduced. The invention also discloses a manufacturing method of the ship side flexible anti-fragment penetration layer, which is used for manufacturing the ship side flexible anti-fragment penetration layer.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention discloses a ship side flexible anti-fragment penetration layer, which is formed by alternately distributing glass fiber gridding cloth layers and polyurea layers, wherein the number of the glass fiber gridding cloth layers is a, the number and the thickness of the polyurea layers are the number and the thickness of the polyurea layers and the glass fiber gridding cloth layers, and b is a-1. The thickness of the polyurea layer is k times of the glass fiber gridding cloth layer.
The glass fiber gridding cloth layer and the polyurea layer can play a role in preventing fragment penetration.
The glass fiber gridding cloth layers and the polyurea layers are alternately distributed, the protection effect of the ship board side can be effectively improved by using the composite material of the polyurea and the glass fiber gridding cloth, the protection of the board side liquid tank on fragment penetration can be well enhanced, and the fragment kinetic energy is reduced.
When the flexible penetration-resistant layer is exploded outside, the reliability and the safety of ship side protection are effectively improved, the empty cabin, the liquid cabin and the empty cabin are protected from being damaged, and the maintenance cost of the ship is reduced.
The glass fiber mesh fabric layer is also used for attenuating the incident speed and has a high-temperature resistant effect.
The polyurea layer is also used for slowing down the impact of fragments, plays a role in absorbing a small amount of kinetic energy, and reduces the thickness and the cost of the protective coating while improving the protective capability.
Preferably, the thickness of the polyurea layer is 1.5 times of that of the glass fiber gridding cloth layer, and the adhesion between the polyurea and the glass fiber gridding cloth layer is ensured.
Preferably, the polyurea layer should have a total area greater than the fiberglass scrim layer to ensure the connectivity of the penetration resistant layer.
Preferably, the glass fiber mesh cloth should have a single mesh size greater than or equal to 5mm by 5mm, and the number of the mesh cloth of the single glass fiber layer should be 3-5 layers to ensure the connectivity between the layers.
Preferably, the thickness of the glass fiber scrim layer is obtained by:
the speed calculation formula of the fragment is as follows:
where E is the characteristic energy of the warhead charge. Is calculated as
Where De is the explosive detonation velocity, C and M are the TNT and shell mass, respectively.
The mass calculation formula of the fragments is as follows:
in the formula, BxIs the explosive constant of the explosive, hsAnd diThe average thickness and average inside diameter of the warhead housing, respectively.
The initial kinetic energy calculation formula of the fragment is as follows:
the energy absorption rate of the flexible protective layer is as follows:
in the formula, EaEnergy absorbed for the flexible penetration-resistant layer; v. ofrThe remaining speed of the fragment.
According to the target energy absorption rate value, the residual speed of the fragments after passing through the flexible penetration-resistant layer can be calculated as follows:
for the impact resistance of the penetration-resistant layer, the surface density is adopted to determine the energy absorption capacity of the penetration-resistant layer, and the overall surface density of the flexible penetration-resistant layer is as follows:
d＝∑hi×ρi
wherein d is the areal density, hiIs the thickness of the ith layer of material, and has the unit of m, rhoiThe density of the ith layer of material sheet is in kg.m-3
The areal density absorption energy is EαThe calculation formula is as follows:
since the a-layer polyurea layer and the b-layer fiberglass mesh layer are shared, and the thickness of the polyurea layer is set to be 1.5 times of that of the fiberglass mesh layer, the calculation formula is:
in the formula h1Thickness of polyurea layer, p1Is the density of the polyurea layer, h2Is the thickness, rho, of the fiberglass scrim layer2Is the density of the fiberglass scrim layer.
From the total layer thickness h, and h1＝1.5h2Calculating the number of layers of the polyurea and glass fiber gridding cloth layer as follows:
according to the surface density absorption energy, the thickness calculation formula is obtained as follows:
in order to realize the purpose of lightening the thickness of the coating as much as possible on the basis of ensuring the protection capability of ships and warships so as to achieve the purposes of lightening the dead weight and reducing the volume, the protection level can be further improved by subsequently improving the thickness of the coating, and the value of the total thickness h of the flexible penetration layer is not more than beta percent of the thickness of the coating with the current highest protection level on the premise of meeting the highest protection level.
The invention discloses a manufacturing method of a ship side flexible anti-fragment penetration layer, which comprises the following steps:
step 1: and calculating the speed and the quality of fragments generated by explosion according to the missile warhead explosion fragment forming theory. The calculation formula is as follows:
step 2: and determining the energy dissipation of the fragments penetrating through the flexible penetration-resistant layer according to the target energy absorption rate of the flexible penetration-resistant layer, and calculating the residual speed of the fragments. The calculation formula is as follows:
and step 3: and determining the surface density of a composite penetration-resistant layer consisting of polyurea and glass fiber gridding cloth according to a composite material layering surface density calculation formula. The calculation formula is as follows:
and 4, step 4: and (4) obtaining a relation calculation formula of the surface density absorption energy and the layer thickness according to the initial speed and the residual speed of the fragments and the empirical surface density absorption energy. The calculation formula is as follows:
and 5: and (3) jointly deducing the layer number and the single-layer thickness of the polyurea and glass fiber grid cloth according to the relationship among the layer thickness, the layer number and the total thickness and a joint surface density absorption energy calculation formula. The calculation formula is as follows:
step 6: and (5) manufacturing a flexible anti-fragment penetration layer on the ship side according to the layer number and the single-layer thickness of the polyurea and glass fiber grid cloth determined in the step (5).
The invention discloses a working method of a ship side flexible anti-fragment penetration layer, which comprises the following steps: when the ship side is attacked, the polyurea and glass fiber mesh cloth composite material can effectively improve the protection effect of the ship side, can well strengthen the protection of the side liquid tank on fragment penetration, and reduces fragment kinetic energy. Therefore, the flexible penetration-resistant layer is added on the outer plate of the liquid tank, so that penetration of fragments is prevented when explosion occurs outside, and the reliability and safety of ship side protection are effectively improved; the empty cabin-liquid cabin-empty cabin is effectively protected from being damaged, so that the maintenance cost of the ship after explosion is reduced. Meanwhile, due to the addition of polyurea, the flying of fragments in the explosion process can be reduced.
The glass fiber reinforced polyurea layer plays a role in absorbing energy and reducing fragment scattering. The reinforced polyurea-glass fiber grid cloth composite material consisting of the polyurea layer and the glass fiber grid cloth can effectively improve the fragment penetration resistance of the ship side, and can play a role in reducing the thickness of the coating and the processing cost.
Advantageous effects
1. According to the flexible anti-fragment penetration layer for the ship board side and the manufacturing method thereof, the composite material of the polyurea and the glass fiber grid cloth can effectively improve the protection effect of the ship board side, can well enhance the protection of the board side liquid tank on fragment penetration, and can reduce fragment kinetic energy. Therefore, a flexible penetration-resistant layer is added on the outer plate of the liquid tank, and penetration of fragments can be prevented when explosion happens on the outside. The reliability and the safety of ship side protection can be effectively improved. The empty cabin-liquid cabin-empty cabin can be effectively protected from being damaged, so that the maintenance cost of the ship after explosion is reduced.
2. According to the ship board side flexible fragment penetration resistant layer and the manufacturing method thereof disclosed by the invention, due to the addition of polyurea, fragment scattering in an explosion process can be reduced, and the thickness and cost of a protective coating can be reduced while the protective capability is improved by the application of the glass fiber mesh cloth.
3. The invention discloses a ship board side flexible fragment penetration resistant layer and a manufacturing method thereof.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
wherein: 1-a polyurea layer; 2-fiberglass gridding cloth layer.
FIG. 2 is a flow chart of the calculation for determining the number of layers and thickness of different layers according to the present invention;
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are provided to illustrate the present invention, but are not intended to limit the scope of the present invention.
As shown in fig. 1, in the flexible anti-penetration layer for ship side disclosed in this embodiment, glass fiber mesh fabric layers 2 and polyurea layers 1 are alternately distributed, the number of the glass fiber mesh fabric layers 2 is a, and the number of the polyurea layers 1 is the number and the thickness of the polyurea layers 1 and the glass fiber mesh fabric layers 2, where b is a-1. The thickness of the polyurea layer 1 is k times of the glass fiber gridding cloth layer 2.
The glass fiber gridding cloth layer 2 and the polyurea layer 1 can both play a role in preventing fragment penetration.
The glass fiber gridding cloth layer 2 and the polyurea layer 1 are alternately distributed, the protection effect of the ship board side can be effectively improved by utilizing the composite material of the polyurea and the glass fiber gridding cloth, the protection of the board side liquid tank on the penetration of fragments can be well enhanced, and the fragment kinetic energy is reduced.
When the flexible penetration-resistant layer is exploded outside, the reliability and the safety of ship side protection are effectively improved, the empty cabin, the liquid cabin and the empty cabin are protected from being damaged, and the maintenance cost of the ship is reduced.
The glass fiber mesh fabric layer 2 is also used for attenuating the incident speed and has the function of high temperature resistance.
As shown in fig. 2, in order to solve the above problem, a method for calculating the thickness of a flexible penetration-resistant layer is provided based on an energy absorption law of fragments generated by explosion, and the method comprises the following steps:
step 1: and calculating the speed and the quality of fragments generated by explosion according to the missile warhead explosion fragment forming theory.
Step 2: and determining the energy dissipation of the fragments penetrating through the flexible penetration-resistant layer according to the target energy absorption rate of the flexible penetration-resistant layer, and calculating the residual speed of the fragments.
And step 3: and determining the surface density of a composite penetration-resistant layer consisting of polyurea and glass fiber gridding cloth according to a composite material layering surface density calculation formula.
And 4, step 4: and (4) obtaining a relation calculation formula of the surface density absorption energy and the layer thickness according to the initial speed and the residual speed of the fragments and the empirical surface density absorption energy.
And 5: and (3) jointly deducing the layer number and the single-layer thickness of the polyurea and glass fiber grid cloth according to the relationship among the layer thickness, the layer number and the total thickness and a joint surface density absorption energy calculation formula.
The following describes the method for calculating the flexible protective layer when the flexible protective layer is impacted by the blast fragment of the warhead in detail by combining the examples. The example is the case of an aerial explosion of a certain naturally-broken warhead. The explosive equivalent of the fragment warhead is 40.1kg, and the designed mass of fragments generated by 21.5kg of shell explosion is 0.045 kg.
TABLE 1 fiberglass scrim Material parameters
| Density/g.m-3 | Modulus of elasticity/GPa | Poisson ratio | Elongation percentage | |
| Glass fiber mesh cloth | 2.45 | 85 | 0.22 | 5.4％ |
TABLE 2 polyurea Material parameters
| Density/g.m-3 | Modulus of elasticity/GPa | Poisson ratio | Yield stress/GPa | |
| Polyurea | 7.75 | 216 | 0.3 | 0.16 |
The manufacturing method of the flexible anti-fragment penetration layer on the ship side disclosed by the embodiment comprises the following steps:
And (3) obtaining the initial speed of the fragments as 2089m/s according to the calculation formula and the example value in the step 1.
And 2, determining the energy dissipation of the fragments penetrating through the flexible penetration-resistant layer according to the target energy absorption rate of the flexible penetration-resistant layer, and calculating the residual speed of the fragments.
The flexible penetration-resistant layer plays a role in effectively reducing kinetic energy when the fragments approach the broadside armor, the target energy absorption rate is set to be 40%, and the residual speed of the fragments can be calculated to be 1531m/s according to the calculation formula in the step 2.
And 3, determining a relational expression of the surface density of the composite penetration-resistant layer consisting of polyurea and glass fiber gridding cloth, the layer number and the layer thickness according to a composite material layering surface density calculation formula.
And 4, step 4: and (4) obtaining a relation calculation formula of the surface density absorption energy and the layer thickness according to the initial speed and the residual speed of the fragments and the empirical surface density absorption energy.
And 5: depending on the relationship between layer thickness, layer number and total thickness, in this example, the coating thickness for the protective coating is 100mm for the highest protection level, which in this example is 90% of the thickness of the highest protection level, i.e. β is 90%, and the total thickness of the protective coating layer is 90 mm. And (3) calculating the density absorption energy of the joint surface, and jointly deducing the layer number and the single-layer thickness of the polyurea and glass fiber gridding cloth.
The thicknesses of the polyurea layer 1 and the glass fiber gridding cloth layer 2 calculated in the step 5 are respectively 15mm and 10mm, and the polyurea layer and the glass fiber gridding cloth layer totally comprise 4 layers of polyurea and 3 layers of glass fiber gridding cloth, so that the thickness requirement of an actual protective layer is met.
The glass fiber reinforced polyurea layer 1 can absorb energy and reduce scattering of fragments. The reinforced polyurea-glass fiber grid cloth composite material consisting of the polyurea layer 1 and the glass fiber grid cloth can effectively improve the penetration resistance of the ship side, and can play a role in reducing the thickness of the coating and the processing cost.
When the ship board side damage protective film is impacted by fragments, compared with a pure polyurea coating, the glass fiber gridding cloth can effectively reduce fragment penetration in the ship board side damage process.
The above detailed description further details the objects, technical solutions and advantages of the present invention. The glass fiber mesh cloth and the polyurea material selected in the experiment are subjected to mechanical tests to obtain constitutive parameters, and the truth and reliability of calculation data are ensured in example calculation. The protection requirement on the ship side is analyzed through the damage condition of the ship side in the real ship experiment, the reliability of formula and example calculation is ensured by combining the empirical parameters and the material actual parameters in the real ship experiment, and the application of the flexible penetration-resistant layer in the actual ship protection is ensured. It should be understood that the above-mentioned embodiments are only exemplary of the present invention, and should not be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a flexible anti-rupture of ship topside penetration layer which characterized in that: the glass fiber gridding cloth layers and the polyurea layers are alternately distributed, the number of the glass fiber gridding cloth layers is a, the number of the polyurea layers is the number and the thickness of the polyurea layers and the glass fiber gridding cloth layers, and b is a-1; the thickness of the polyurea layer is k times of that of the glass fiber gridding cloth layer;
the glass fiber mesh cloth layer and the polyurea layer can play a role in preventing fragment penetration;
the glass fiber mesh cloth layers and the polyurea layers are alternately distributed, the protection effect of the ship side is improved by using the composite material of the polyurea and the glass fiber mesh cloth, the protection of the side liquid tank on fragment penetration is enhanced, and the fragment kinetic energy is reduced;
when the flexible penetration-resistant layer is exploded outside, the reliability and safety of ship side protection are effectively improved, the empty cabin, the liquid cabin and the empty cabin are protected from being damaged, and the maintenance cost of the ship is reduced;
the glass fiber mesh cloth layer is also used for attenuating the incident speed and has a high-temperature resistant effect;
the polyurea layer is also used for slowing down the impact of fragments, plays a role in absorbing a small amount of kinetic energy, and reduces the thickness and the cost of the protective coating while improving the protective capability.
2. The flexible anti-fragment penetration layer on the ship side of claim 1, wherein: the thickness of polyurea layer is 1.5 times of glass fiber net cloth layer, guarantees polyurea and glass fiber net cloth layer's adhesion.
3. The flexible anti-fragment penetration layer on the ship side of claim 1, wherein: the total area of the polyurea layer is larger than that of the glass fiber gridding cloth layer so as to ensure the connectivity of the penetration-resistant layer.
4. The flexible anti-fragment penetration layer on the ship side of claim 1, wherein: the size of each mesh of the glass fiber mesh cloth is larger than or equal to 5mm by 5mm, and the number of the mesh cloth of each glass fiber layer is 3-5 layers so as to ensure the connectivity between the layers.
5. The flexible anti-fragment penetration layer on the ship side of claim 1, wherein: the thickness of the fiberglass scrim layer is obtained by the following method,
the speed calculation formula of the fragment is as follows:
wherein E is the characteristic energy of the warhead charge; is calculated as
Wherein De is the explosive loading detonation velocity, C and M are the mass of TNT and shell respectively;
the mass calculation formula of the fragments is as follows:
in the formula, BxIs the explosive constant of the explosive, hsAnd diThe average thickness and average inside diameter of the warhead housing, respectively;
the initial kinetic energy calculation formula of the fragment is as follows:
the energy absorption rate of the flexible protective layer is as follows:
in the formula, EaAbsorbed energy for flexible penetration-resistant layersAn amount; v. ofrThe residual speed of the fragment;
according to the target energy absorption rate value, calculating the residual speed of the fragments after passing through the flexible penetration-resistant layer as follows:
for the impact resistance of the penetration-resistant layer, the surface density is adopted to determine the energy absorption capacity of the penetration-resistant layer, and the overall surface density of the flexible penetration-resistant layer is as follows:
d＝∑hi×ρi
wherein d is the areal density, hiIs the thickness of the ith layer of material, and has the unit of m, rhoiThe density of the ith layer of material sheet is in kg.m-3
The areal density absorption energy is EαThe calculation formula is as follows:
since the a-layer polyurea layer and the b-layer fiberglass mesh layer are shared, and the thickness of the polyurea layer is set to be 1.5 times of that of the fiberglass mesh layer, the calculation formula is:
in the formula h1Thickness of polyurea layer, p1Is the density of the polyurea layer, h2Is the thickness, rho, of the fiberglass scrim layer2The density of the glass fiber gridding cloth layer;
from the total layer thickness h, and h1＝1.5h2Calculating the number of layers of the polyurea and glass fiber gridding cloth layer as follows:
according to the surface density absorption energy, the thickness calculation formula is obtained as follows:
in order to realize the purpose of lightening the thickness of the coating as much as possible on the basis of ensuring the protection capability of ships and warships so as to achieve the purposes of lightening the dead weight and reducing the volume, the protection level is further improved by subsequently improving the thickness of the coating, and the value of the total thickness h of the flexible penetration layer is not more than beta percent of the thickness of the coating with the current highest protection level on the premise of meeting the highest protection level.
6. The flexible penetration-resistant layer for a ship side of claim 1, 2, 3, 4 or 5, wherein: the manufacturing method comprises the following steps:
step 1: calculating the speed and the quality of fragments generated by explosion according to the missile warhead explosion fragment forming theory; the calculation formula is as follows:
step 2: determining the energy dissipation of the fragments penetrating through the flexible penetration-resistant layer according to the target energy absorption rate of the flexible penetration-resistant layer, and calculating the residual speed of the fragments; the calculation formula is as follows:
and step 3: determining the surface density of a composite penetration-resistant layer consisting of polyurea and glass fiber gridding cloth according to a composite material layering surface density calculation formula; the calculation formula is as follows:
and 4, step 4: obtaining a relation calculation formula of the surface density absorption energy and the layer thickness according to the initial speed and the residual speed of the fragments and the empirical surface density absorption energy; the calculation formula is as follows:
and 5: according to the relationship among the layer thickness, the layer number and the total thickness and the joint surface density absorption energy calculation formula, the layer number and the single-layer thickness of the polyurea and glass fiber grid cloth are deduced in a combined mode; the calculation formula is as follows:
step 6: and (5) manufacturing a flexible anti-fragment penetration layer on the ship side according to the layer number and the single-layer thickness of the polyurea and glass fiber grid cloth determined in the step (5).
7. The flexible anti-fragment penetration layer on the ship side of claim 6, wherein: the working method is that when the ship side is attacked, the composite material of the polyurea and the glass fiber grid cloth can effectively improve the protection effect of the ship side, can well strengthen the protection of the side liquid tank on the penetration of fragments, and reduces the fragment kinetic energy; therefore, the flexible penetration-resistant layer is added on the outer plate of the liquid tank, so that penetration of fragments is prevented when explosion occurs outside, and the reliability and safety of ship side protection are effectively improved; the empty cabin-liquid cabin-empty cabin is effectively protected from being damaged, so that the maintenance cost of the ship after explosion is reduced; meanwhile, due to the addition of polyurea, the flying of fragments in the explosion process can be reduced;
the glass fiber reinforced polyurea layer plays a role in absorbing energy and reducing fragment scattering; the reinforced polyurea-glass fiber grid cloth composite material consisting of the polyurea layer and the glass fiber grid cloth can effectively improve the fragment penetration resistance of the ship side, and can play a role in reducing the thickness of the coating and the processing cost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111038345.2A CN113650374B (en) | 2021-09-06 | 2021-09-06 | Ship side flexible anti-fragment penetration layer and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111038345.2A CN113650374B (en) | 2021-09-06 | 2021-09-06 | Ship side flexible anti-fragment penetration layer and manufacturing method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113650374A true CN113650374A (en) | 2021-11-16 |
| CN113650374B CN113650374B (en) | 2023-02-28 |
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| CN114212194A (en) * | 2021-12-10 | 2022-03-22 | 哈尔滨工程大学 | Protection liquid tank structure of explosion high-speed fragment under water resistance |
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