CN113482500B - Design method and system of protective airtight door with aluminum honeycomb sandwich structure - Google Patents
Design method and system of protective airtight door with aluminum honeycomb sandwich structure Download PDFInfo
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- CN113482500B CN113482500B CN202110572503.6A CN202110572503A CN113482500B CN 113482500 B CN113482500 B CN 113482500B CN 202110572503 A CN202110572503 A CN 202110572503A CN 113482500 B CN113482500 B CN 113482500B
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/10—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
- E06B5/12—Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against air pressure, explosion, or gas
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
- E06B3/70—Door leaves
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Abstract
The application provides a design method and a system of an aluminum honeycomb sandwich structure protective airtight door. The method comprises the following steps: determining the equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under the direct action of the overpressure of the nuclear explosion air shock wave; respectively determining the thickness value range of the surface plate and the thickness value range of the core material according to the surface plate material, the core material and the equivalent static load based on a preset surface plate thickness model and a preset core material thickness model; adjusting the thickness of the surface plate based on a preset bending stress model until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate; adjusting the thickness of the core material based on a preset shear stress model until the shear stress of the core material is less than or equal to the allowable shear stress of the core material; and determining the door leaf deformation of the protective airtight door with the honeycomb sandwich structure based on a preset deflection model, and adjusting the thickness of the core material again or adjusting the core material according to the door leaf deformation.
Description
Technical Field
The application relates to the technical field of protective equipment, in particular to a design method and a system of an aluminum honeycomb sandwich structure protective airtight door.
Background
At present, among materials used for protective equipment, the most common materials are reinforced concrete and common steel, which are limited by economic conditions, the protection consciousness is not strong, and the processing technology and detection means of the protective equipment are laggard, so that the novel material is difficult to be applied in the protective equipment, and various ultrahigh-strength alloy materials and composite materials have excellent performance but cannot be applied in the field of the protective equipment. On one hand, materials with different properties are selected for protective equipment with different purposes and different resistance, so that the materials can fully exert the characteristics of the protective equipment; on the other hand, the development and selection of high-performance materials, such as light high-strength materials and anticorrosive and antirust materials, should be enhanced, and practical measures should be taken to improve the processing level of protective equipment manufacturers.
In the past decades, advanced composite materials have been regarded as important due to their advantages of high strength, high specific modulus, high temperature resistance, excellent mechanical properties and designability, and are widely used in the industrial fields of aerospace and the like, and the types of composite materials are diverse and can be roughly classified into fiber-reinforced composite materials, sandwich laminated composite materials, particle composite materials, hybrid composite materials and the like according to structural forms. However, research shows that the honeycomb sandwich structure composite material meets the bottleneck in the application field of the protective equipment due to the lack of a corresponding design method.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
An object of the present application is to provide a method and system for designing a protective airtight door with an aluminum honeycomb sandwich structure, so as to solve or alleviate the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a design method of an aluminum honeycomb sandwich structure protective airtight door, which comprises the following steps: s101, determining equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under direct action of overpressure of nuclear explosion air shock waves; s102, determining a thickness value range of a gauge plate according to a gauge plate material and an equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset gauge plate thickness model; determining the thickness value range of the core material according to the core material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset core material thickness model; step S103, adjusting the thickness of the surface plate according to the thickness value range and the equivalent static load of the surface plate based on a preset bending stress model until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate, wherein the allowable bending stress of the surface plate is determined according to the surface plate material; based on a preset shear stress model, adjusting the thickness of the core material according to the thickness value range and the equivalent static load of the core material until the shear stress of the core material is less than or equal to the allowable shear stress of the core material, wherein the allowable shear stress of the core material is determined according to the core material; and S104, determining the door leaf deformation of the protective airtight door with the honeycomb sandwich structure according to the equivalent static load and the adjusted thickness of the core material based on a preset deflection model, and adjusting the thickness of the core material again or adjusting the core material according to the door leaf deformation until the door leaf deformation is less than or equal to the maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the protective airtight door with the honeycomb sandwich structure.
Preferably, step S101 is specifically: determining the equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under the direct action of the overpressure of the nuclear explosion air shock wave based on a preset equivalent static load model; the equivalent dead load model is as follows:
q e ＝K d ×ΔP c
wherein q is e Equivalent static load; k d The power coefficient of a door leaf structure of the protective airtight door with the aluminum honeycomb sandwich structure is directly influenced by the overpressure of the nuclear explosion air shock wave; delta P c The design value of the overpressure of the nuclear explosion air shock wave acting on the protective airtight door with the aluminum honeycomb sandwich structure is shown.
Preferably, the skin thickness model is:
wherein, t f The thickness of the surface plate; a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure; rho C The density of the core material is determined according to the material of the core material; rho f The density of the surface plate is determined according to the surface plate material; [ sigma ] A] f Allowable bending stress for the surface plate; beta is as tableAnd the plate thickness coefficient is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
Preferably, the core material thickness model is:
wherein, t c The thickness of the core material; a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure; ρ is a unit of a gradient c The density of the core material is determined according to the material of the core material; ρ is a unit of a gradient f The density of the surface plate is determined according to the surface plate material; [ sigma ]] f Allowable bending stress for the surface plate; beta is a surface plate thickness coefficient and is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
Preferably, step S103 includes: calculating the bending stress of the surface plate according to the thickness value range and the equivalent static load of the surface plate based on a preset bending stress model, and adjusting the thickness of the surface plate according to the calculation result of the bending stress of the surface plate until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate; calculating the shear stress of the core material according to the thickness value range and the equivalent static load of the core material based on a preset shear stress model, and adjusting the thickness of the core material according to the calculation result of the shear stress of the core material until the shear stress of the core material is less than or equal to the allowable shear stress of the core material;
the bending stress model is:
the shear stress model is:
wherein σ f Calculating the bending stress of the surface plate; t is t c The thickness of the core material; t is t f The thickness of the surface plate; beta is a surface plate thickness coefficient, and is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure; q. q of e Equivalent dead load; a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure; tau. c Calculating the shearing stress of the core material; and gamma is the thickness coefficient of the core material, and is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
Preferably, step S104 specifically includes: based on a preset deflection model, calculating the door leaf deflection of the protective airtight door with the aluminum honeycomb sandwich structure according to the equivalent static load and the adjusted thickness of the core material, and adjusting the thickness of the core material again or adjusting the core material according to the calculation result of the door leaf deflection until the door leaf deflection is less than or equal to the maximum door leaf allowable deflection;
the deflection model is as follows:
wherein delta is the door leaf deformation of the protective airtight door with the aluminum honeycomb sandwich structure; alpha is alpha 1 、α 2 The first deflection coefficient and the second deflection coefficient are respectively determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure; q. q.s e Equivalent dead load; a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure; t is t c The thickness of the core material; d is the door leaf rigidity of the protective airtight door with the aluminum honeycomb sandwich structure, and is determined according to the thickness of the core material and the surface plate material; g c The fracture coefficient of the core material is determined according to the core material.
Preferably, based on a preset door leaf rigidity model, determining the door leaf rigidity of the protective airtight door with the aluminum honeycomb sandwich structure according to the thickness of the core material and the surface plate material; the door leaf rigidity model is as follows:
wherein D isDoor leaf stiffness; e is the elastic modulus of a surface plate of the protective airtight door with the aluminum honeycomb sandwich structure, and is determined according to a surface plate material; t is t f The thickness of the surface plate; v. of f The Poisson's ratio of the watch plate is determined according to the watch plate material.
Preferably, in step S101, the aluminum honeycomb sandwich structure protective airtight door is clamped at four sides when being installed.
Preferably, the design height of the aluminum honeycomb sandwich structure airtight door is greater than or equal to the design width of the aluminum honeycomb sandwich structure airtight door.
The embodiment of the present application further provides a design system of an aluminum honeycomb sandwich structure protective airtight door, including:
the load determining unit is configured to determine equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under direct action of overpressure of nuclear explosion air shock waves;
the thickness calculation unit is configured to determine the thickness value range of the gauge plate according to the gauge plate material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset gauge plate thickness model; determining the thickness value range of the core material according to the core material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset core material thickness model;
the thickness adjusting unit is configured to adjust the thickness of the surface plate according to the thickness value range and the equivalent static load of the surface plate based on a preset bending stress model until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate, wherein the allowable bending stress of the surface plate is determined according to a surface plate material; based on a preset shear stress model, adjusting the thickness of the core material according to the thickness value range and the equivalent static load of the core material until the shear stress of the core material is less than or equal to the allowable shear stress of the core material, wherein the allowable shear stress of the core material is determined according to the core material;
and the optimization unit is configured to determine the door leaf deformation of the protective airtight door with the honeycomb sandwich structure based on a preset deflection model according to the equivalent static load and the adjusted thickness of the core material, and adjust the thickness of the core material again or adjust the core material according to the door leaf deformation until the door leaf deformation is less than or equal to the maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the protective airtight door with the honeycomb sandwich structure.
Has the advantages that:
in the technical scheme provided by the embodiment of the application, based on a panel thickness model, the thickness value range of the panel is determined according to the panel material of the protective airtight door with the aluminum honeycomb sandwich structure and the equivalent static load of the protective airtight door under the direct action of the overpressure of the nuclear explosion air shock wave; based on a preset core material thickness model, determining the thickness value range of a core material according to the core material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure; then, adjusting the thickness of the surface plate and the thickness of the core material through a preset bending stress model and a preset shearing stress model in the value range of the form and the value range of the core material respectively, so that the surface plate meets the bending working condition and the core material meets the shearing working condition; and then, calculating the door leaf deformation of the aluminum honeycomb sandwich structure protective airtight door according to the gauge plate thickness meeting the bending working condition and the core material thickness meeting the shearing working condition through a preset deflection model, if the calculation result of the door leaf deformation does not meet the maximum door leaf allowable deformation, adjusting the gauge plate thickness and the core material thickness again or replacing the core material, and verifying the adjusted gauge plate, the bending working condition of the core material, the shearing working condition and the door leaf deformation again until the gauge plate thickness and the core material thickness meet the requirements of the bending working condition, the shearing working condition and the maximum door leaf deformation simultaneously. Therefore, the surface plate and the core material of the aluminum honeycomb sandwich structure protective airtight door are optimized, the aluminum honeycomb sandwich structure protective airtight door is more economical, and the door has the advantages of small density, uniform stress, light weight, good mechanical property and the like, the consumption of expensive surface plate materials is reduced, the structure weight is reduced, the strength and the rigidity are increased, and the service life is longer.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
fig. 1 is a schematic flow diagram of a method of designing an aluminum honeycomb sandwich structural containment door provided in accordance with some embodiments of the present application;
FIG. 2 is a schematic illustration of values of a skin thickness coefficient and a core thickness coefficient provided in accordance with some embodiments of the present application;
FIG. 3 is a graphical illustration of the values of a first coefficient of deflection and a second coefficient of deflection provided in accordance with some embodiments of the present application;
fig. 4 is a schematic structural view of an aluminum honeycomb sandwich structure in an aluminum honeycomb sandwich structure containment door provided in accordance with some embodiments of the present application;
figure 5 is a schematic cross-sectional view of a core material in a honeycomb sandwich structure provided in accordance with some embodiments of the present application;
fig. 6 is a schematic diagram of a design system for an aluminum honeycomb sandwich structured containment and containment door provided in accordance with some embodiments of the present application.
Description of the reference numerals:
401-a face plate; 402-a core material; 601-a load determining unit; 602-a thickness calculation unit; 603-a thickness adjusting unit; 604-optimization unit.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the description of the present application, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description of the present application and do not require that the present application must be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly interpreted, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
Fig. 1 is a schematic flow diagram of a method of designing an aluminum honeycomb sandwich structural containment door provided in accordance with some embodiments of the present application; as shown in fig. 1, the design method of the aluminum honeycomb sandwich structure protective airtight door comprises the following steps:
s101, determining an equivalent static load of a protective airtight door with an aluminum honeycomb sandwich structure under the direct action of overpressure of nuclear explosion air shock waves;
in the embodiment of the application, the protective airtight door is used as important protective equipment and is an important measure for preventing explosion shock waves from entering a protective project, the protective airtight door with the aluminum honeycomb sandwich structure is designed according to the load of the nuclear explosion shock waves, a door leaf is simplified into a single-degree-of-freedom elastoplastic system under the action of power, and the protective airtight door can be designed according to an equivalent static load method; the load acting on the protective airtight door is mainly an air impact fluctuation load which changes along with time, and the equivalent static load is converted according to a corresponding equivalent static load method, namely the equivalent static load is uniformly distributed. Therefore, the effect of the equivalent static load on the honeycomb sandwich structure protective airtight door is the same as the effect of direct action of the nuclear explosion shock wave overpressure, and the calculation process and the calculation amount of the design of the honeycomb sandwich structure protective airtight door are simplified.
In a specific example, step S101 is specifically: determining the equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under the direct action of the overpressure of the nuclear explosion air shock wave based on a preset equivalent static load model; the equivalent dead load model is shown as the following formula (1), and the formula (1) is as follows:
q e ＝K d ×ΔP c …………………………………(1)
wherein q is e Is equivalent dead load (namely, uniform equivalent dead load) with the unit of cattle per square centimeter (N/cm) 2 )；K d Coefficient of dynamics of door leaf structure of containment doors of aluminium honeycomb sandwich construction for direct action of overpressure of nuclear explosion air shock wave, e.g. K d ＝1.2；ΔP c The overpressure design value of the nuclear explosion air shock wave acting on the protective airtight door with the aluminum honeycomb sandwich structure is expressed in unit of N/cm 2 )。
In the embodiment of the present application, the kinetic coefficient is obtained according to formula (2), and formula (2) is as follows:
and Z is a ductility ratio, the structure of the door leaf is designed according to an elastic-plastic stage, and when the value of Z is 3, the kinetic coefficient is 1.2.
Here, it should be noted that the equivalent static load may be a concentrated load or a uniform load, in this embodiment of the application, the uniform load is adopted as the equivalent static load, and four sides of the protective airtight door with the aluminum honeycomb sandwich structure are fixedly supported when the protective airtight door is installed.
Step S102, determining a thickness value range of a surface plate 401 according to a surface plate material and an equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset surface plate thickness model; based on a preset core material thickness model, determining the thickness value range of the core material 402 according to the core material and the equivalent static load of the aluminum honeycomb sandwich structure protective airtight door;
specifically, the thickness model of the surface plate is shown in formula (3), and formula (3) is as follows:
the core material thickness model is shown in the following formula (4), and the formula (4) is as follows:
wherein, t f Is the thickness of the surface plate, and the unit is centimeter (cm); t is t c Core material thickness in centimeters (cm); a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is centimeter (cm); rho C Is the density of core 402 in grams per cubic centimeter (g/cm) 3 ) Determined according to the core material; ρ is a unit of a gradient f The density of the face plate 401 is given in grams per cubic centimeter (g/cm) 3 ) Determined according to the surface plate material; [ sigma ] A] f Allowable bending stress of the surface plate 401 is given in grams per square centimeter (g/cm) 2 ) (ii) a Beta is a surface plate thickness coefficient, and is determined according to the ratio of the design height to the design width of the aluminum honeycomb sandwich structure protective airtight door (as shown in fig. 2), and it needs to be noted that a surface plate thickness coefficient curve is obtained by fitting according to historical design data.
In the embodiment of the application, the minimum value of the thickness of the surface plate can be obtained through the surface plate thickness model, and the minimum value of the thickness of the core material can be obtained through the core material thickness model, so that the structure and the volume of the aluminum honeycomb sandwich structure protective airtight door can be effectively controlled, the weight and the thickness of a door leaf of the aluminum honeycomb sandwich structure protective airtight door can be reduced on the premise that the protective performance of the aluminum honeycomb sandwich structure protective airtight door is met, civil air defense section civil engineering quantity is reduced, the installation and the maintenance of the aluminum honeycomb sandwich structure protective airtight door are facilitated, the comprehensive cost of civil air defense engineering is reduced, and the comprehensive economic benefit is improved.
Step S103, based on a preset bending stress model, adjusting the thickness of the surface plate 401 according to the thickness value range and the equivalent static load of the surface plate 401 until the bending stress of the surface plate 401 is less than or equal to the allowable bending stress of the surface plate 401, wherein the allowable bending stress of the surface plate 401 is determined according to a surface plate material; based on a preset shear stress model, adjusting the thickness of the core material 402 according to the thickness value range and the equivalent static load of the core material 402 until the shear stress of the core material is less than or equal to the allowable shear stress of the core material, wherein the allowable shear stress of the core material 402 is determined according to the core material;
in the embodiment of the present application, based on a preset bending stress model, the bending stress of the surface plate 401 is calculated according to the thickness value range and the equivalent static load of the surface plate 401, and the thickness of the surface plate is adjusted according to the calculation result of the bending stress of the surface plate 401 until the bending stress of the surface plate 401 is less than or equal to the allowable bending stress of the surface plate 401. The bending stress model is shown as the following equation (5), and equation (5) is as follows:
wherein σ f The calculation results of the bending stress of the surface plate 401 are in units of grams per square centimeter (g/cm) 2 )；t c Core material thickness in centimeters (cm); t is t f Is the thickness of the surface plate, and the unit is centimeter (cm); beta is a surface plate thickness coefficient, and is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure; q. q of e For equivalent dead load, the unit is cattle per square centimeter (N/cm) 2 ) (ii) a and a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is centimeter (cm).
In the embodiment of the application, based on a preset shear stress model, the shear stress of the core material is calculated according to the thickness value range and the equivalent static load of the core material 402, and the thickness of the core material is adjusted according to the calculation result of the shear stress of the core material 402 until the shear stress of the core material 402 is less than or equal to the allowable shear stress of the core material 402. The shear stress model is shown in equation (6) below, and equation (6) is as follows:
wherein, tau c Is a calculation of the shear stress of core 402 in grams per square centimeter (g/cm) 2 ) (ii) a Gamma is the thickness coefficient of the core material, which is determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure (as shown in fig. 2), and it should be noted that the core materialAnd fitting the thickness coefficient curve according to historical design data.
Thus, it is verified whether the skin 401 of the taken thickness satisfies the allowable bending stress of the skin material by checking the bending stress of the skin 401, and whether the core 402 of the taken thickness satisfies the shear stress of the core material by checking the shear stress of the core 402. Furthermore, the values of the thickness of the surface plate and the thickness of the core material can be effectively guaranteed to meet the performance requirements of the bending working condition and the shearing working condition of the protective airtight door with the aluminum honeycomb sandwich structure.
And S104, determining the door leaf deformation of the honeycomb sandwich structure protective airtight door according to the equivalent static load and the adjusted thickness of the core material 402 based on a preset deflection model, and adjusting the thickness of the core material 402 again or adjusting the core material according to the door leaf deformation until the door leaf deformation is less than or equal to the maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the honeycomb sandwich structure protective airtight door.
Specifically, based on a preset deflection model, the door leaf deflection of the aluminum honeycomb sandwich structure protective airtight door is calculated according to the equivalent static load and the adjusted thickness of the core material 402, and the thickness of the core material 402 is adjusted again or the core material is adjusted according to the calculation result of the door leaf deflection until the door leaf deflection is less than or equal to the maximum door leaf allowable deflection.
Therefore, the deflection inspection is carried out on the aluminum honeycomb sandwich structure protective airtight door which meets the bending working condition and the shearing working condition and has the corresponding surface plate thickness and core material thickness, and whether the door leaf protective airtight door can meet the requirement of the maximum door leaf allowable deflection is verified. If the gauge plate thickness meeting the bending working condition and the shearing working condition and the aluminum honeycomb sandwich structure protective airtight door corresponding to the core material thickness do not meet the maximum door leaf allowable deformation amount, the gauge plate thickness and the core material thickness are required to be subjected to value selection (increasing the gauge plate thickness and the core material thickness) or the core material with larger shearing modulus is required to be replaced, and the bending working condition, the shearing working condition and the deflection are checked again until the gauge plate thickness and the core material thickness can meet the requirements of the bending working condition, the shearing working condition and the deflection at the same time.
In one specific example, the deflection model is shown in equation (7), where equation (7) is as follows:
wherein delta is the door leaf deformation of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is centimeter (cm); alpha is alpha 1 、α 2 The first deflection coefficient and the second deflection coefficient are respectively determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure (as shown in figure 3), and it is required to be noted that the first deflection coefficient curve and the second deflection coefficient curve are obtained by fitting according to historical design data; q. q.s e For equivalent dead load, the unit is cattle per square centimeter (N/cm) 2 ) (ii) a a is the design width of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is centimeter (cm); t is t c Core material thickness in centimeters (cm); d is the door leaf rigidity of the protective airtight door with the aluminum honeycomb sandwich structure, the unit is N/cm, and the rigidity is determined according to the thickness of the core material and the panel material; g c The coefficient of rupture of the core 402 in grams per square centimeter (g cm) 2 ) And is determined according to the core material.
Further, determining the door leaf rigidity of the protective airtight door with the aluminum honeycomb sandwich structure according to the thickness of the core material and the surface plate material based on a preset door leaf rigidity model; the door leaf stiffness model is shown in formula (8), and formula (8) is as follows:
wherein D is the rigidity of the door leaf, and the unit is cattle per centimeter (N/cm); e is the elastic modulus of the surface plate 401 of the protective airtight door with the aluminum honeycomb sandwich structure and has the unit of gram square centimeter (g.cm) 2 ) Determined according to the surface plate material; t is t f Is the thickness of the panel in centimeters (cm); v. of f The poisson's ratio of the skin 401 is determined based on the skin material.
In the embodiment of the application, when the values of the thickness of the surface plate and the thickness of the core material simultaneously meet the inspection of the bending working condition, the shearing working condition and the deflection, at the moment, the weight of the protective airtight door with the aluminum honeycomb sandwich structure designed according to the values of the thickness of the surface plate and the thickness of the core material is the minimum. Specifically, the weight calculation of the aluminum honeycomb sandwich structure protective airtight door is shown in formula (9), wherein the formula (9) is as follows:
W＝2×ρ f ×a×b×t f +ρ C ×a×b×t c ……………(9)
wherein, W is the weight of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is gram (g); and b is the design height of the protective airtight door with the aluminum honeycomb sandwich structure, and the unit is centimeter (cm). Here, it should be noted that, in the embodiment of the present application, the design height of the aluminum honeycomb sandwich structure protective airtight door is greater than or equal to the design width of the aluminum honeycomb sandwich structure protective airtight door.
Through the technical scheme of this application embodiment, can realize the optimization to dash board 401 and core 402 of aluminium honeycomb sandwich structure protective airtight door, make aluminium honeycomb sandwich structure protective airtight door more economical, have density little, the atress is even, the quality is light, mechanical properties advantage such as good, long service life is longer.
Fig. 4 is a schematic structural view of an aluminum honeycomb sandwich structure in an aluminum honeycomb sandwich structure containment door provided in accordance with some embodiments of the present application; figure 5 is a schematic cross-sectional view of a core material in a honeycomb sandwich structure provided in accordance with some embodiments of the present application; as shown in fig. 4 and 5, skins are respectively formed on the upper and lower bottom surfaces of a core material 402 through surface plates 401, the upper surface plate and the lower surface plate have the same structure and size (thickness), the cross section of the core material is a regular hexagon, and a light porous material and a light sandwich material are adopted to improve the specific strength, specific rigidity and impact resistance of the protective airtight door with the aluminum honeycomb sandwich structure. Meanwhile, when the honeycomb sandwich structure bears an external load, the weight can be reduced by 70-90% on the premise of ensuring that the bending rigidity is not different from that of a solid structure made of the same material and having the same thickness, and the lightweight requirement on the protective airtight door with the aluminum honeycomb sandwich structure is met. Here, it should be noted that, in addition to the aluminum honeycomb, the honeycomb sandwich structure may be made of (aromatic polyamide) NOMEX honeycomb or plain paper honeycomb.
In this application embodiment, use aluminium honeycomb sandwich structure design protective airtight door, can make aluminium honeycomb sandwich structure protective airtight door's density littleer, the atress is more even, the quality is lighter, mechanical properties is better, long service life is longer, effectively alleviate aluminium honeycomb sandwich structure design protective airtight door's equipment weight and door leaf thickness, reduce civil air defense section civil engineering excavation engineering volume, improve aluminium honeycomb sandwich structure design protective airtight door corrosion resisting property, make things convenient for aluminium honeycomb sandwich structure design protective airtight door installation and maintenance, reduce civil air defense engineering comprehensive cost, improve comprehensive economic benefits.
Fig. 6 is a schematic diagram of a design system for an aluminum honeycomb sandwich structural containment door provided in accordance with some embodiments of the present application; as shown in fig. 6, the design system of the aluminum honeycomb sandwich structure protective airtight door comprises:
the load determining unit 601 is configured to determine equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under direct action of overpressure of nuclear explosion air shock waves;
the thickness calculation unit 602 is configured to determine a thickness value range of the surface plate 401 according to a surface plate material and an equivalent static load of the aluminum honeycomb sandwich structure protective airtight door based on a preset surface plate thickness model; based on a preset core material thickness model, determining the thickness value range of the core material 402 according to the core material and the equivalent static load of the aluminum honeycomb sandwich structure protective airtight door;
a thickness adjusting unit 603 configured to adjust the thickness of the surface plate 401 according to the thickness value range and the equivalent static load of the surface plate 401 based on a preset bending stress model until the bending stress of the surface plate 401 is less than or equal to the allowable bending stress of the surface plate 401, wherein the allowable bending stress of the surface plate 401 is determined according to the surface plate material; adjusting the thickness of the core material 402 based on a preset shear stress model according to the thickness value range and the equivalent static load of the core material 402 until the shear stress of the core material 402 is less than or equal to the allowable shear stress of the core material 402, wherein the allowable shear stress of the core material 402 is determined according to the core material;
and an optimizing unit 604 configured to determine a door leaf deformation of the cellular sandwich structure airtight protective door according to the equivalent static load and the adjusted thickness of the core material 402 based on a preset deflection model, and adjust the thickness of the core material 402 again or adjust the core material according to the door leaf deformation until the door leaf deformation is less than or equal to a maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the cellular sandwich structure airtight protective door.
The design system of the protective airtight door with the aluminum honeycomb sandwich structure, provided by the embodiment of the application, can realize the steps and the flow of any design method embodiment of the protective airtight door with the aluminum honeycomb sandwich structure, and achieve the same technical effects, and is not repeated one by one.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A design method of an aluminum honeycomb sandwich structure protective airtight door is characterized by comprising the following steps:
s101, determining an equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure under direct action of overpressure of nuclear explosion air shock waves;
step S102, determining a thickness value range of the gauge plate according to the gauge plate material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset gauge plate thickness model; and the number of the first and second groups,
based on a preset core material thickness model, determining the thickness value range of the core material according to the core material of the protective airtight door with the aluminum honeycomb sandwich structure and the equivalent static load;
step S103, based on a preset bending stress model, adjusting the thickness of the surface plate according to the thickness value range of the surface plate and the equivalent static load until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate, wherein the allowable bending stress of the surface plate is determined according to the surface plate material; and the number of the first and second groups,
based on a preset shear stress model, adjusting the thickness of the core material according to the thickness value range of the core material and the equivalent static load until the shear stress of the core material is less than or equal to the allowable shear stress of the core material, wherein the allowable shear stress of the core material is determined according to the core material;
and S104, determining the door leaf deformation of the protective airtight door with the honeycomb sandwich structure according to the equivalent dead load and the adjusted thickness of the core material based on a preset deflection model, and adjusting the thickness of the core material again or adjusting the core material according to the door leaf deformation until the door leaf deformation is less than or equal to the maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the protective airtight door with the honeycomb sandwich structure.
2. The method for designing the protective airtight door with the aluminum honeycomb sandwich structure according to claim 1, wherein the step S101 is specifically as follows: determining the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure under the direct action of the overpressure of the nuclear explosion air shock wave based on a preset equivalent static load model; the equivalent dead load model is as follows:
wherein, the first and the second end of the pipe are connected with each other,
is the equivalent dead load;
the door leaf structure of the protective airtight door with the aluminum honeycomb sandwich structure directly acts on overpressure of nuclear explosion air shock wavesThe kinetic coefficient of (a);
the design value of the overpressure of the nuclear explosion air shock wave acting on the protective airtight door with the aluminum honeycomb sandwich structure is obtained.
3. The method for designing the airtight door with the aluminum honeycomb sandwich structure according to claim 2, wherein the thickness model of the surface plate is:
wherein the content of the first and second substances,
is the skin thickness;
designing the width of the protective airtight door with the aluminum honeycomb sandwich structure;
the density of the core material is determined according to the core material;
determining the density of the surface plate according to the surface plate material;
allowable bending stress for the surface plate;
and determining the thickness coefficient of the surface plate according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
4. The method for designing a protective airtight door with an aluminum honeycomb sandwich structure according to claim 2, wherein the core material thickness model is:
wherein the content of the first and second substances,
is the core material thickness;
designing the width of the protective airtight door with the aluminum honeycomb sandwich structure;
determining the density of the core material according to the core material;
determining the density of the surface plate according to the surface plate material;
allowable bending stress for the surface plate;
and determining the thickness coefficient of the surface plate according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
5. The method for designing a protective airtight door with an aluminum honeycomb sandwich structure according to claim 1, wherein the step S103 comprises:
calculating the bending stress of the surface plate according to the thickness value range of the surface plate and the equivalent static load based on a preset bending stress model, and adjusting the thickness of the surface plate according to the calculation result of the bending stress of the surface plate until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate;
and (c) a second step of,
calculating the shear stress of the core material according to the thickness value range of the core material and the equivalent static load based on a preset shear stress model, and adjusting the thickness of the core material according to the calculation result of the shear stress of the core material until the shear stress of the core material is less than or equal to the allowable shear stress of the core material;
the bending stress model is as follows:
the shear stress model is as follows:
wherein the content of the first and second substances,
calculating the bending stress of the surface plate;
is the core material thickness;
is the skin thickness;
determining the thickness coefficient of the surface plate according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure;
is the equivalent dead load;
designing the width of the protective airtight door with the aluminum honeycomb sandwich structure;
calculating the result of the shear stress of the core material;
and determining the thickness coefficient of the core material according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure.
6. The method for designing the aluminum honeycomb sandwich structure protective airtight door according to claim 1, wherein the step S104 is specifically: based on a preset deflection model, calculating the door leaf deflection of the aluminum honeycomb sandwich structure protective airtight door according to the equivalent static load and the adjusted thickness of the core material, and adjusting the thickness of the core material again or adjusting the core material according to the calculation result of the door leaf deflection until the door leaf deflection is less than or equal to the maximum door leaf allowable deflection;
the deflection model is as follows:
wherein the content of the first and second substances,
the deformation of the door leaf of the protective airtight door with the aluminum honeycomb sandwich structure is measured;
、
the first deflection coefficient and the second deflection coefficient are respectively determined according to the ratio of the design height to the design width of the protective airtight door with the aluminum honeycomb sandwich structure;
is the equivalent dead load;
designing the width of the protective airtight door with the aluminum honeycomb sandwich structure;
is the core material thickness;
determining the rigidity of the door leaf of the protective airtight door with the aluminum honeycomb sandwich structure according to the thickness of the core material, the thickness of the surface plate material and the thickness of the surface plate;
the fracture coefficient of the core material is determined according to the core material.
7. The design method of the aluminum honeycomb sandwich structure protective airtight door according to claim 6, characterized in that based on a preset door leaf stiffness model, the door leaf stiffness of the aluminum honeycomb sandwich structure protective airtight door is determined according to the core material thickness, the panel material and the panel thickness; the door leaf rigidity model is as follows:
wherein, the first and the second end of the pipe are connected with each other,
is the door leaf stiffness;
determining the elastic modulus of a surface plate of the protective airtight door with the aluminum honeycomb sandwich structure according to the surface plate material;
is the skin thickness;
the Poisson ratio of the surface plate is determined according to the surface plate material.
8. The method of designing an aluminum honeycomb sandwich structured containment door as recited in any one of claims 1 to 7, wherein in step S101, the aluminum honeycomb sandwich structured containment door is braced on four sides when installed.
9. The method for designing the aluminum honeycomb sandwich structure protective airtight door according to any one of claims 1 to 7, wherein the design height of the aluminum honeycomb sandwich structure airtight door is greater than or equal to the design width of the aluminum honeycomb sandwich structure airtight door.
10. The utility model provides a design system of aluminium honeycomb sandwich structure protective airtight door which characterized in that includes:
the load determining unit is configured to determine equivalent static load of the aluminum honeycomb sandwich structure protective airtight door under direct action of overpressure of nuclear explosion air shock waves;
the thickness calculation unit is configured to determine the thickness value range of the gauge plate according to the gauge plate material and the equivalent static load of the protective airtight door with the aluminum honeycomb sandwich structure based on a preset gauge plate thickness model; based on a preset core material thickness model, determining a thickness value range of the core material according to the core material of the protective airtight door with the aluminum honeycomb sandwich structure and the equivalent static load;
the thickness adjusting unit is configured to adjust the thickness of the surface plate according to the thickness value range of the surface plate and the equivalent static load based on a preset bending stress model until the bending stress of the surface plate is less than or equal to the allowable bending stress of the surface plate, wherein the allowable bending stress of the surface plate is determined according to the surface plate material; based on a preset shear stress model, adjusting the thickness of the core material according to the thickness value range of the core material and the equivalent static load until the shear stress of the core material is less than or equal to the allowable shear stress of the core material, wherein the allowable shear stress of the core material is determined according to the core material;
and the optimization unit is configured to determine the door leaf deformation of the honeycomb sandwich structure protective airtight door according to the equivalent static load and the adjusted thickness of the core material based on a preset deflection model, and adjust the thickness of the core material again or adjust the core material according to the door leaf deformation until the door leaf deformation is less than or equal to the maximum door leaf allowable deformation, wherein the maximum door leaf allowable deformation is determined by the design resistance level of the honeycomb sandwich structure protective airtight door.
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