Metal sandwich composite hull structure and method of designing a cross section thereof

Abstract

The application provides a metal sandwich composite ship body structure and a design method of a midship section thereof. The design method of the midship section comprises the following steps: when the metal sandwich structure of a main deck is determined, the overall longitudinal strength load and the local strength load of the main deck are satisfied simultaneously; when the metal sandwich structure of a lower deck and a platform deck is determined, the local loads of the lower deck and the platform deck are satisfied simultaneously; when the metal sandwich structure of a side structure is determined, the overall longitudinal strength and the local load of the side are satisfied simultaneously, the distance between the longitudinal girders of the traditional ship is basically unchanged, and the materials are unchanged; when the metal sandwich structure of a deck connecting structure is determined, the thickness of the part connected with the traditional structure is not less than the thickness of the same part of the traditional ship, and the thickness of the part connected with the metal sandwich plate is not less than the thickness of the corresponding part of the metal sandwich plate connected therewith. The design method of the midship section provided by the application can apply the metal sandwich structure design to the existing ship body structure, and can significantly improve the carrying capacity under the condition of equal weight.

Description

Technical Field

[0001] This invention relates to the field of ship structure design technology, and in particular to a metal sandwich composite hull structure and its cross-sectional design method. Background Technology

[0002] Metal sandwich panels refer to a sandwich structure consisting of upper and lower metal panels and metal cores such as I-shaped and V-shaped panels, which are laser-welded together to form a whole. Recent domestic research has shown that metal sandwich panels offer advantages over traditional slab-reinforced structures, including lighter weight, higher rigidity, and higher load-bearing capacity. Currently, metal sandwich panels are being applied abroad to high-load-bearing components such as lower decks and platform structures, achieving good results in terms of lightweighting and high load-bearing capacity.

[0003] The cross-sectional structural design of the hull is an important part of ship structural design. However, the existing technology does not apply the design of metal sandwich panels to the main load-bearing structure. Therefore, it is necessary to propose a design method for applying metal sandwich panels to the main load-bearing hull structure, so as to provide guidance for achieving a lightweight and high load-bearing hull structure. Summary of the Invention

[0004] The main objective of this invention is to provide a metal sandwich composite hull structure and a cross-sectional design method thereof, which aims to facilitate the rational application of metal sandwich panels to existing ships.

[0005] To achieve the above objectives, this invention provides a mid-section design method for a metal sandwich composite hull structure, including the design of a metal sandwich panel structure for the main deck, lower deck, platform deck, side structure, and deck connection structure. When determining the metal sandwich structure of the main deck, it is necessary to simultaneously meet the requirements of the overall longitudinal strength load of the hull and the local strength load of the main deck. When determining the metal sandwich structure of the lower deck and platform deck, it is necessary to simultaneously meet the local load requirements of both the lower deck and the platform deck. When determining the metal sandwich structure of the hull side structure, it is necessary to simultaneously meet the requirements of the overall longitudinal strength of the hull and the local load of the hull side. When determining the deck connection structure, the thickness of the plate in the part connected to the traditional structure shall not be less than the thickness of the plate in the same part of the traditional ship, and the thickness of the part connected to the metal sandwich panel shall not be less than the thickness of the corresponding part of the connected metal sandwich panel.

[0006] Preferably, the thickness of the upper and lower panels of the metal sandwich panels in the main deck, lower deck, platform deck, side structure, and deck connection structure is not less than 1 mm.

[0007] Preferably, when determining the metal sandwich structure of the main deck, the height of the core web of the main deck metal sandwich panel is the same as the height of the bulb flat steel strip plate system used in the main deck of traditional ships, and the maximum span along the length of the ship remains consistent with that of traditional ships. The section modulus of a single core material strip unit in the main deck metal sandwich panel is greater than that of a single spherical flat steel strip unit in traditional ships.

[0008] Preferably, when determining the metal sandwich structure of the main deck, the Euler stress value of the web of the main deck metal sandwich panel is greater than 1.5 to 2 times the material yield strength, and the Euler stress values ​​of the upper and lower panels of the main deck metal sandwich panel are both greater than 1 times the material yield strength. The longitudinal theoretical Euler stress value of a single core material strip plate unit in the main deck metal sandwich panel is greater than the longitudinal theoretical Euler stress value of a single spherical flat steel strip plate unit in traditional ships.

[0009] Preferably, when determining the metal sandwich structure of the lower deck and platform deck, the individual core material strip plate unit in the metal sandwich panel of the lower deck and the metal sandwich panel of the platform deck is used as a simply supported single-span beam. Under the same uniformly distributed load, the local strength calculation shows that the stress value is less than that of a single spherical flat steel strip plate unit in traditional ships, while the weight is reduced by more than 10%-15%.

[0010] Preferably, when determining the metal sandwich structure of the lower deck and the platform deck, the web spacing of the metal sandwich panels of the lower deck and the platform deck is consistent with the web spacing of the metal sandwich panels of the main deck.

[0011] Preferably, when determining the metal sandwich structure of the side structure, the web height of the side deck metal sandwich plate is the same as the height of the bulb flat steel in traditional ships, the structural section modulus of the side deck metal sandwich plate is not less than the section modulus of the bulb flat steel in traditional ships, and the weight is reduced by not less than 10% for structural design.

[0012] Preferably, when determining the metal sandwich structure of the side structure, the Euler stress values ​​of the upper panel, lower panel, and web of the metal sandwich panel of the side structure are all greater than 1 times the material yield strength.

[0013] Preferably, when determining the metal sandwich structure of the main deck, the reduced cross-sectional area of ​​the lower deck, platform deck, and side structure is used to thicken the metal sandwich panel of the main deck.

[0014] The present invention also proposes a metal sandwich composite hull structure, which is manufactured using the metal sandwich composite hull structure and its cross-sectional design method as described above.

[0015] The mid-section design method for the metal sandwich composite hull structure proposed in this invention has the following beneficial effects.

[0016] 1. Based on the transverse section of the traditional hull of a surface vessel that meets the specifications and relevant requirements, this design method designs the main deck 1, lower deck and sides of the hull as metal sandwich panels. While meeting the load and strength requirements of the hull, it achieves a relatively unchanged transverse section area compared to the traditional structure, thereby increasing the vertical moment of inertia of the transverse section in the hull structure and improving the overall longitudinal load-bearing capacity of the hull.

[0017] 2. The cross-sectional design method described in this paper can provide a design reference for the application of metal sandwich structures in the main load-bearing hull structure, thus providing guidance for improving the load-bearing capacity of lightweight, high load-bearing hull structures. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the midship section of a traditional ship hull. Figure 2 This is a schematic diagram of the mid-cross section structure initially determined by the mid-cross section design method of the metal sandwich composite hull structure of the present invention. Figure 3a This is a schematic diagram of the main view of a typical spherical flat steel strip structure in a traditional ship hull. Figure 3b This is a top view schematic diagram of a typical bulb flat steel strip structure in a traditional ship hull. Figure 4 This is a structural diagram of a single bulb flat steel strip unit, a typical bulb flat steel strip structure in traditional ship hulls. Figure 5a This is a schematic diagram of the main view structure of the metal sandwich panel, which is initially determined by the mid-section design method of the metal sandwich composite hull structure of the present invention. Figure 5b This is a top view schematic diagram of the metal sandwich panel, which is initially determined by the mid-section design method of the metal sandwich composite hull structure of the present invention. Figure 6 This is a schematic diagram of the core material strip plate unit in the metal sandwich panel, which is preliminarily determined by the mid-section design method of the metal sandwich composite hull structure of the present invention. Figure 7 A schematic diagram of the first side connection structure designed using the mid-section design method of the metal sandwich composite hull structure of the present invention. Figure 8 A schematic diagram of the second side connection structure designed using the mid-section design method of the metal sandwich composite hull structure of the present invention. Figure 9 This is a schematic diagram of a traditional ship structure in one embodiment of the mid-section design method for the metal sandwich composite hull structure of the present invention. Figure 10 This is a schematic diagram of the cross section of the metal sandwich composite hull structure in the design method of the cross section of the metal sandwich composite hull structure of the present invention.

[0019] In the diagram, 1-Main deck, 2-Lower deck, 3-Platform deck, 4-Side structure, 5-Double bottom, 6-Main deck longitudinal girder, 7-Main deck plating, 8-Main deck bulb flat steel, 9-Lower deck longitudinal girder, 10-Lower deck plating, 11-Lower deck bulb flat steel, 12-Platform deck longitudinal girder, 13-Platform deck plating, 14-Platform deck bulb flat steel, 15-Side plating, 16-Side bulb flat steel, 17-Main deck metal sandwich panel, 18-Lower deck metal sandwich panel, 19-Platform deck metal sandwich panel, 20-Side deck metal sandwich panel, 21-Main deck side connection structure, 22-First side connection structure, 23-Second side connection structure.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] This invention proposes a method for designing the mid-section of a metal sandwich composite hull structure.

[0023] In this preferred embodiment, a mid-section design method for a metal sandwich composite hull structure includes the design of a metal sandwich panel structure comprising a main deck 1, a lower deck 2, a platform deck 3, a side structure 4, and a deck connection structure. When determining the metal sandwich structure of the main deck 1, it is necessary to simultaneously meet the requirements of the overall longitudinal strength load of the hull and the local strength load of the main deck 1. When determining the metal sandwich structure of the lower deck 2 and the platform deck 3, it is necessary to simultaneously meet the local load requirements of both the lower deck 2 and the platform deck 3. When determining the metal sandwich structure of the side structure 4, it is necessary to simultaneously meet the requirements of the overall longitudinal strength of the hull and the local load of the side, while keeping the spacing and material of the longitudinal girder of the traditional ship unchanged. When determining the deck connection structure, the thickness of the plate in the part connected to the traditional structure shall not be less than the thickness of the plate in the same part of the traditional ship, and the thickness of the part connected to the metal sandwich panel shall not be less than the thickness of the corresponding part of the connected metal sandwich panel.

[0024] Specifically, the preliminary overall design of the metal sandwich panels in the transverse section of the hull structure is carried out first. Based on the transverse section of the traditional sheet-rigid hull structure that meets the specifications and relevant requirements, all structures in the traditional hull transverse section except for the double bottom 5 are designed as metal sandwich panels, including the main deck 1, lower deck 2, platform structure, and side structure 4. The core layer of the metal sandwich panels in the main deck 1, lower deck 2, platform deck 3, etc., all adopts an I-type structure. Due to the high strength and stiffness of the double bottom 5 structure itself, the original structure is maintained unchanged. The thickness of the upper and lower panels of the metal sandwich panels in the main deck 1, lower deck 2, platform deck 3, side structure 4, and deck connection structure is not less than 1mm.

[0025] The main deck 1 includes the main deck metal sandwich panel 17 and the main deck longitudinal girder 6, which must simultaneously meet the requirements of the overall longitudinal strength load of the hull and the local strength load of the main deck 1.

[0026] Specifically, when determining the metal sandwich structure of the main deck 1, the core layer web height of the main deck metal sandwich plate 17 is the same as the height of the bulb flat steel in the bulb flat steel strip plate system of the main deck 1 in conventional ships, and the maximum span along the length of the ship is consistent with that of conventional ships. The section modulus of a single core material strip unit of the main deck metal sandwich panel 17 is greater than that of a single spherical flat steel strip unit in traditional ships.

[0027] When determining the metal sandwich structure of the main deck 1, the Euler stress value of the web of the main deck metal sandwich panel 17 is greater than 1.5 to 2 times the material yield strength, and the Euler stress values ​​of the upper and lower panels of the main deck metal sandwich panel 17 are both greater than 1 times the material yield strength. The longitudinal theoretical Euler stress value of a single core material strip plate unit in the main deck metal sandwich panel 17 is greater than the longitudinal theoretical Euler stress value of a single spherical flat steel strip plate unit in traditional ships.

[0028] Specifically, when determining the metal sandwich structure of the lower deck 2 and the platform deck 3, the individual core material strip plate unit in the deck metal sandwich plate 18 and the platform deck metal sandwich plate 19 is used as a simply supported single-span beam. Under the same uniformly distributed load, the local strength calculation shows that the stress value is less than that of a single spherical flat steel strip plate unit in traditional ships, while the weight is reduced by more than 10%-15%.

[0029] Specifically, when determining the metal sandwich structure of the lower deck 2 and the platform deck 3, the web spacing of the lower deck metal sandwich plate 18 and the platform deck metal sandwich plate 19 is consistent with the web spacing of the main deck metal sandwich plate 17. The spacing and material of the longitudinal girder T-shaped of the lower deck 2 and the platform deck 3 remain basically unchanged compared with the longitudinal girder of traditional ships.

[0030] Specifically, when determining the metal sandwich structure of the side structure 4, the web height of the side deck metal sandwich plate 20 is the same as the height of the bulb flat steel in traditional ships, the structural section modulus of the side deck metal sandwich plate 20 is not less than the section modulus of the bulb flat steel in traditional ships, and the weight is reduced by not less than 10% for structural design.

[0031] Specifically, when determining the side structure 4, the Euler stress values ​​of the upper panel, lower panel, and web of the metal sandwich panel of the side structure 4 (including the main deck side connection structure 21, the first side connection structure 22, and the second side connection structure 23) are all greater than 1 times the material yield strength.

[0032] When determining the metal sandwich structure of the main deck 1, the reduced cross-sectional area of ​​the lower deck 2, platform deck 3, and side structure 4 was used to thicken the metal sandwich plate of the main deck 1, thereby keeping the overall cross-sectional area of ​​the hull basically unchanged. At the same time, considering the overall increase of the vertical section modulus and the uniformity of the upper and lower section modulus on the mid-section, comprehensive optimization was carried out, and finally, the design of the mid-section of the hull metal sandwich was completed.

[0033] The following section, in conjunction with the drawings, will explain the cross-sectional design method in detail.

[0034] 1. Preliminary overall design of the cross section by Figure 1 For reference, the main deck 1, lower deck 2, platform deck 3, and side structure 4 in the diagram are designed with the longitudinal girder remaining basically unchanged, and a metal sandwich panel structure is constructed. The preliminary design is as follows: Figure 2 As shown, Figure 1 The main deck plating 7 and main deck bulb flat steel 8 are both designed as main deck metal sandwich panels 17; the lower deck 10 and lower deck bulb flat steel 11 are both designed as lower deck metal sandwich panels 18; the platform deck 13 and platform deck bulb flat steel 14 are designed as platform deck metal sandwich panels 19; the side plating 15 and side bulb flat steel 16 are designed as side deck metal sandwich panels 20, and the double bottom 5 maintains the original design; the main deck 1, lower deck 2, and platform deck 3 are connected to the side using connecting structures 19, 20, and 21, respectively. All metal sandwich panels use an I-type core material structure, and the material yield strength remains consistent with the original ship.

[0035] 2. Structural Design of Main Deck 1 While keeping the main deck longitudinal girder 6 of the main deck 1 basically unchanged, the design of the main deck metal sandwich panel 17 is carried out with reference to the single bulb flat steel strip plate unit composed of the main deck plate 7 and the main deck bulb flat steel 8.

[0036] The typical structure of the main deck 1 of a traditional ship is as follows: Figure 3a and Figure 3bAs shown, the plate thickness is t1, the width is B, the span is L, the spacing of the bulb flats is s1, the dimension is Q, and the web height of the bulb flats is h1; the dimensions of a single bulb flat strip unit are as follows. Figure 4 As shown. When for Figure 3a and Figure 3b When the corresponding structure is changed to a metal sandwich panel, the typical structure of the main deck metal sandwich panel 17 is shown in Figure 5. Its width is B, span is L, and the thicknesses of the upper panel, web, and lower panel are t2, t3, and t4, respectively. The web height is h2, and the web spacing is S2. The structure of a single metal sandwich core material strip unit is as follows: Figure 6 As shown.

[0037] Compared to the typical traditional spherical flat steel strip plate structure in Figure 3, the typical metal sandwich panel in Figure 5 is optimized. Taking h2 and h1 as the same, the constraints include: keeping the cross-sectional area of ​​Figure 5 essentially unchanged from Figure 3; ensuring the stability requirements are met for the upper and lower panels and web of the metal sandwich panel; maximizing the section modulus of a single core material strip plate unit; and aiming for the theoretical Euler stress to be greater than that of the corresponding single spherical flat steel strip plate unit. A preliminary design scheme for the typical main deck metal sandwich panel structure 17 is obtained.

[0038] 3. Structural design of lower deck 2 and platform deck 3 The lower deck longitudinal girder 9 of the lower deck 2 and the platform deck longitudinal girder 12 of the platform deck 3 remain basically unchanged. The lower deck plate 10 and the lower deck bulb flat steel 11 are both designed as lower deck metal sandwich panels 18; the platform deck plate 13 and the platform deck bulb flat steel 14 are designed as platform deck metal sandwich panels 17.

[0039] For typical metal sandwich panels of lower deck 2 and platform deck 3, referring to Figures 3 and 5, the web spacing is consistent with the web spacing S2 of the main deck metal sandwich panel 17. Taking a single I-shaped core material strip element in the metal sandwich panel, a simply supported single-span beam is designed. Under the same uniformly distributed load, the local strength calculation shows that the stress value is less than that of the original single bulb flat steel element. With the goal of reducing the overall weight of the metal sandwich panel by more than 10%, typical structural designs of lower deck metal sandwich panel 18 and platform deck metal sandwich panel 17 are carried out to obtain the structural design schemes of metal sandwich panels for lower deck 2 and platform deck 3.

[0040] 4. Design of Side Structure 4 The side plate 15 and the side bulb flat steel 16 are designed as the side metal sandwich panel 20. For the typical structure of the side metal sandwich panel, referring to Figure 3, the height of the sandwich panel is kept consistent with that of the side bulb flat steel 16. With the goal of reducing the cross-sectional area of ​​the typical metal sandwich panel structure by 10% and increasing the section modulus of the metal sandwich panel core material strip unit, the typical structural design of the side deck metal sandwich panel 20 is carried out. At the same time, the stability of the upper and lower panels and web of the metal sandwich panel and the full stability requirement of the theoretical Euler stress of the metal sandwich core material unit are considered to obtain the structural design scheme of the side metal sandwich panel 20.

[0041] 5. Metal sandwich panel connection structure design Main deck 1 and side structure 4 are connected by main deck side connection structure 21, see detailed drawing. Figure 7 The lower deck 2 is connected to the side by the first side connection structure 21, see detailed drawing. Figure 8 Platform deck 3 is connected to the side by the second side connection structure 22, see [link / reference]. Figure 8 The plate thickness of each connecting structure connected to the traditional structure (referring to the unchanging material parts, such as longitudinal girder) shall not be less than the plate thickness of the same part in a traditional ship (meaning...). Figure 7 The corresponding thicknesses t5, t6, t9, and t10 of the medium-sized metal sandwich panels shall not be less than [amount missing]. Figure 9 The thickness of the portion connected to the metal sandwich panel is not less than the thickness of the corresponding portion of the connected metal sandwich panel (meaning...). Figure 7 and Figure 8 The thicknesses t7, t8, t11, t12, and t13 of the intermediate plates shall not be less than the thickness of the connected metal sandwich plates.

[0042] 6. Comprehensive optimization design of cross-section in metal sandwich hull structure Through the above design, it is expected that the cross-sectional area of ​​the lower deck 2, platform deck 3 and side structure 4 will be reduced by about 10% while maintaining the strength. The reduced cross-sectional area will be used to thicken the metal sandwich panel of the main deck 1, so that the overall cross-sectional area of ​​the hull remains basically unchanged. Based on the overall improvement of the vertical section modulus, comprehensive optimization will be carried out to complete the design of the cross-sectional area of ​​the metal sandwich panel of the hull.

[0043] The following specific embodiment illustrates the cross-sectional design method described herein.

[0044] 1. Overall cross-sectional design Traditional cross-section examples Figure 9 As shown, metal sandwich panel designs are carried out for the main deck 1, lower deck 2, platform deck 3 and side structure 4. The metal sandwich panels adopt I-type core material, the hull material is 355MPa grade steel, and the elastic modulus is 2.06×105MPa.

[0045] 2. Metal Sandwich Main Deck 1 Structural Design In a traditional hull cross-section, the main deck longitudinal girder 6 of main deck 1 measures 12×380 / 14×160 mm. The typical main deck 1 system uses bulb flat steel strips with a width of 2340 mm, a span of 1500 mm, and a thickness of 10 mm. The strips are made of No. 10 bulb flat steel with a spacing of 390 mm. The calculated cross-sectional area is 277.2 cm². 2 The section modulus of a single bulb flat steel strip unit (10×250 + 10 bulbs) is 43.7cm. 3 Calculated according to the Euler stress formula for longitudinal bones ( In the formula, (where E is the theoretical Euler stress, I is the elastic modulus of the material, A is the cross-sectional area of ​​the material, and L is the length). The theoretical Euler stress is 726.8 MPa. For details of the calculations, please refer to Tables 1, 2 and 4.

[0046] After designing the main deck metal sandwich panel 17, the web spacing is taken as 140mm, the thickness t of the upper and lower panels is 4mm, the web thickness is 5mm, and the height is 100mm. Calculations show that the metal sandwich panel has a cross-sectional area of ​​267.2cm², and the section module of the core material strip unit (140×4+100×5+140×4) is 63.8cm². 3 The theoretical Euler stress is 1922.7 MPa, and the Euler stress of the upper and lower panel elements is 608.2 MPa (the formula for calculating the Euler stress of a plate is...). In the formula, t is the plate thickness and b is the plate width. The Euler stress of the web is 1862.5 MPa. The main deck 1 structure metal sandwich panel has better strength and stability than the traditional structure under the same cross-sectional area. The above calculations are shown in Tables 1 to 4.

[0047] 3. Structural design of metal sandwich lower deck 2 and platform deck 3 In a traditional ship hull cross-section, the dimensions of the lower deck longitudinal girder 9 of lower deck 2 are 6×200 / 8×80, with a plate thickness of 4mm, made of No. 6 bulb flat steel, and a spacing of 390mm; the section module of a single bulb flat steel strip unit (4×250 + bulb 6) is 12.3cm. 3 The metal sandwich panel is designed with a top and bottom panel thickness of 1.5mm, a web thickness of 1mm, and a height of 50mm. The section module of the core material strip unit (140×1.5+45×1+140×1.5) is 9.8cm. 3 .

[0048] The platform deck 3 has longitudinal girder 12 with dimensions of 6×240 / 10×100, plate thickness of 4mm, No. 6 bulb flat steel, and a spacing of 390mm; after design, the metal sandwich panel of the lower deck 2 has a thickness of 1.5mm for the upper and lower panels, a web thickness of 1mm, and a height of 45mm.

[0049] The metal sandwich panels of the lower deck 2 and platform deck 3 achieve superior strength compared to traditional structures while reducing the cross-sectional area.

[0050] 4. Design of the Gold Side Structure 4 In the traditional hull cross section, the side structure 4 is 10mm thick, made of No. 10 bulb flat steel, with a spacing of 390mm; after design, the side metal sandwich panel has a thickness of 4mm on the upper and lower panels, a web thickness of 5mm, and a height of 100mm.

[0051] 5. Design of the connection structure The longitudinal girder between the metal sandwich panels of each deck also serves as the connection structure between the metal sandwich panels; the main deck 1 is connected to the side metal sandwich panels through the main deck side connection structure 21, the thickness of the part connected to the metal sandwich panels is 5mm, and the thickness of the single panel part is 12mm; the metal sandwich panels of the lower deck 2 and the platform deck 3 are connected to the side structure 4 through the first side connection structure 22 and the second side connection structure 23, the thickness of the outer panel part is 10mm, and the thickness of the part connected to the metal sandwich panels is 5mm.

[0052] 6. Comprehensive optimization design of cross-section in metal sandwich hull structure With the overall cross-sectional area of ​​the mid-section being relatively constant, a comprehensive cross-sectional optimization design is carried out. Based on the above design, firstly, the cross-sectional area of ​​the main deck 1 remains essentially unchanged in the preliminary design. The cross-sectional areas of the lower deck 2, platform deck 3, and side structure 4 are reduced compared to traditional schemes. The reduced cross-sectional area is allocated to the main deck 1, and the dimensions of the main deck 1 structure are adjusted and corrected. The metal sandwich panels of the main deck 1 are adjusted to 7mm for the upper panel, 7mm for the web, and 7mm for the lower panel. The adjusted mid-section is as follows: Figure 10 As shown, the cross-sectional modulus and stability of the metal sandwich unit of the main deck 1 will be further improved. The vertical moment of inertia of the overall transverse section is increased by about 10% according to calculation. The design is completed. The dimensions of the main components of the transverse section are shown in Table 5 below.

[0053] Table 1 Comparison of Cross-sectional Areas of Metal Sandwich Panels and Traditional Reinforced Panels

[0054] Table 2. Calculation of Section Modulus and Local Strength of Simply Supported Beams at Both Ends

[0055] Table 3 Calculation Table of Theoretical Euler Stress for Plates

[0056] Table 4 Calculation of Euler Stress in the Theory of Longitudinal Bones

[0057] Table 5. Dimensions of Main Components in Cross Section of Metal Sandwich Composite Hull Structure

[0058] The mid-section design method for the metal sandwich composite hull structure proposed in this invention has the following beneficial effects.

[0059] 1. Based on the transverse section of the traditional hull of a surface vessel that meets the specifications and relevant requirements, this design method designs the main deck 1, lower deck and sides of the hull as metal sandwich panels. While meeting the load and strength requirements of the hull, it achieves a relatively unchanged transverse section area compared to the traditional structure, thereby increasing the vertical moment of inertia of the transverse section in the hull structure and improving the overall longitudinal load-bearing capacity of the hull.

[0060] 2. The cross-sectional design method described in this paper can provide a design reference for the application of metal sandwich structures in the main load-bearing hull structure, thus providing guidance for the overall improvement of lightweight and high load-bearing hull structures.

[0061] The present invention also proposes a metal sandwich composite hull structure.

[0062] In this preferred embodiment, a metal sandwich composite hull structure is manufactured using the metal sandwich composite hull structure and its cross-sectional design method described in the above embodiments.

[0063] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for designing the mid-section of a metal sandwich composite hull structure, characterized in that, The design includes a metal sandwich panel structure for the main deck, lower deck, platform deck, side structures, and deck connection structures. When determining the metal sandwich structure of the main deck, it is necessary to simultaneously meet the requirements of the overall longitudinal strength load of the hull and the local strength load of the main deck. When determining the metal sandwich structure of the lower deck and platform deck, it is necessary to simultaneously meet the local load requirements of both the lower deck and the platform deck. When determining the metal sandwich structure of the hull side structure, it is necessary to simultaneously meet the requirements of the overall longitudinal strength of the hull and the local load of the hull side. When determining the deck connection structure, the thickness of the plate in the part connected to the traditional structure shall not be less than the thickness of the plate in the same part of the traditional ship, and the thickness of the part connected to the metal sandwich panel shall not be less than the thickness of the corresponding part of the connected metal sandwich panel. When determining the metal sandwich structure of the main deck, the Euler stress value of the web of the main deck metal sandwich panel is greater than 1.5 to 2 times the material yield strength, and the Euler stress values ​​of the upper and lower panels of the main deck metal sandwich panel are both greater than 1 times the material yield strength. The longitudinal theoretical Euler stress value of a single core material strip plate unit in the main deck metal sandwich panel is greater than the longitudinal theoretical Euler stress value of a single bulb flat steel strip plate unit in traditional ships. When determining the metal sandwich structure of the lower deck and platform deck, the individual core material strip plate unit in the metal sandwich panel of the lower deck and platform deck is treated as a simply supported single-span beam. Under the same uniformly distributed load, the local strength calculation shows that the stress value is less than that of a single bulb flat steel strip plate unit in traditional ships, while the weight is reduced by more than 10%-15%. When determining the metal sandwich structure of the side structure, the web height of the metal sandwich panel of the side deck is the same as the height of the bulb flat steel in traditional ships. The structural section modulus of the metal sandwich panel of the side deck is not less than the section modulus of the bulb flat steel in traditional ships, and the weight is reduced by not less than 10% for structural design. When determining the metal sandwich structure of the main deck, the reduced cross-sectional area of ​​the lower deck, platform deck, and side structures is used to thicken the metal sandwich panels of the main deck.

2. The mid-section design method for the metal sandwich composite hull structure as described in claim 1, characterized in that, The thickness of the upper and lower panels of the metal sandwich panels in the main deck, lower deck, platform deck, side structure, and deck connection structure shall not be less than 1 mm.

3. The mid-section design method for the metal sandwich composite hull structure as described in claim 1, characterized in that, When determining the metal sandwich structure of the main deck, the height of the core web of the main deck metal sandwich panel is the same as the height of the bulb flat steel strip plate system used in the main deck of traditional ships, and the maximum span along the length of the ship is kept consistent with that of traditional ships. The section modulus of a single core material strip unit in the main deck metal sandwich panel is greater than that of a single spherical flat steel strip unit in traditional ships.

4. The mid-section design method for the metal sandwich composite hull structure as described in claim 1, characterized in that, When determining the metal sandwich structure of the lower deck and platform deck, the web spacing of the metal sandwich panels of the lower deck and platform deck should be consistent with the web spacing of the metal sandwich panels of the main deck.

5. The mid-section design method for the metal sandwich composite hull structure as described in claim 1, characterized in that, When determining the metal sandwich structure of the side structure, the Euler stress values ​​of the upper panel, lower panel, and web of the metal sandwich panel of the side structure are all greater than 1 times the material yield strength.

6. A metal sandwich composite hull structure, characterized in that, It is manufactured using the metal sandwich composite hull structure and its cross-sectional design method as described in any one of claims 1 to 5.

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