Internal structure supporting structure scheme of novel material ship

Abstract

The invention discloses an internal structure supporting structure scheme of a novel material ship, and belongs to the field of ship structure materials. According to the scheme, the surface of a metal net framework (composed of galvanized aluminum steel wires or stainless steel wires) is subjected to roughening treatment, meshes are filled with basalt fibers or glass fiber layers, and then thermoplastic materials such as polyethylene, polypropylene, polyvinyl chloride or polyurethane are melted and injected; the composite plate with the incident flow face thick plastic layer and the back flow face thin plastic layer is manufactured. The composite structure integrates the high rigidity of the metal framework, the energy absorption performance of the fiber layer and the corrosion resistance of the plastic layer, effectively solves the problems that a traditional thermoplastic material ship plate is prone to creep deformation and layering and poor in durability, and is suitable for integrated supporting and corrosion prevention of ship body internal stress parts such as keels, bottom plates and supporting columns. The material is mainly used for small ships in oceans and inland rivers, and has the advantages of light weight, high strength, corrosion resistance, recoverability and the like.

Description

Technical Field

[0001] The present invention relates to the field of ship structural materials, and particularly to a steel mesh reinforced composite material structure applied to internal support structures of a ship hull (such as keels, bottom plates, support columns, etc.), belonging to the technical field of lightweight, high-strength and anti-corrosion structural materials for ships. Background Art

[0002] With the rapid development of marine fisheries and offshore transportation, the demand for lightweight, high-strength and anti-corrosion structural materials for ships is continuously increasing. In the prior art, although steel plates and aluminum alloy plates have high strength, they are easily corroded by seawater and have a large weight; although glass fiber reinforced plastics (GFRP) or carbon fiber reinforced plastics (CFRP) have the characteristics of corrosion resistance and lightweight, under the long-term action of the marine environment, there are still problems such as fatigue damage, creep deformation and interface delamination.

[0003] For ship structural materials, it is necessary to balance lightweight, corrosion resistance and long-term service stability. In the prior art, the technical solution of patent document CN1915739: ABS extruded plates are used for the upper and lower shells of a composite hull, and its filling layer is foamed polyurethane, which is combined through a fiber bonding layer, having the advantages of integral molding, strength improvement and cavity isolation. However, its fiber bonding layer is limited to a single fiber type and lacks the support of a composite mesh skeleton, making it difficult to meet the structural requirements of high-load parts.

[0004] High-density polyethylene (HDPE) has been applied in the field of ship outer plates. Document CN115197490A discloses an HDPE composite material containing various modified nanofibers (carbon fiber, aramid fiber, silicon nitride fiber) and antioxidants and ultraviolet inhibitors, significantly improving the mechanical properties under high temperature and harsh environments. However, this material is still mainly an integral plastic body, lacking an internal metal or structural mesh support, and is prone to creep and fatigue damage under the long-term action of waves and temperature cycles.

[0005] Although the above technical solutions improve the weather resistance and mechanical properties of the materials, in key stress-bearing parts such as keels and bottom plates, it is still difficult to meet the structural requirements of both high-rigidity support and multi-layer interface energy absorption, and at the same time, it lacks effective anti-corrosion protection and recyclable design.

[0006] In summary, the existing internal structural materials of ship hulls generally have defects such as low creep strength, short fatigue life, poor anti-corrosion performance and low recycling rate, and there is an urgent need to provide a support structural material solution with high strength, anti-corrosion, durability and recyclability. Summary of the Invention

[0007] The present invention aims to solve the following technical problems existing in the existing thermoplastic or fiber-reinforced composite materials in the internal support structure of a ship hull: The material has serious creep deformation and is difficult to meet the requirements of long-term continuous loads; The interfacial adhesion is insufficient, and the fibers, plastics and metal framework are prone to delamination; The contact between the internal metal framework and the external environment leads to rapid corrosion.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: An internal structure support structure solution for a ship made of a new material, characterized by comprising: A three-dimensional metal mesh framework (1), the metal mesh is made of galvanized aluminum steel wire, stainless steel wire or galvanized steel wire, the diameter of the metal wire is 0.5 - 5 mm, and the mesh size is 1 - 50 mm; The surface of the metal mesh framework (1) is roughened by shot blasting or sandblasting to improve its interfacial adhesion strength with the composite material; In the mesh holes of the metal mesh framework (1), a reinforcing fiber layer (2) is filled, and the fiber is one or more of basalt fiber, glass fiber, Kevlar or carbon fiber, and is distributed in a non-directional laying or cross-weaving manner; Using a thermoplastic material, the thermoplastic material (including but not limited to polyethylene, polypropylene, polyvinyl chloride, polyurethane, etc., mainly polyethylene) is injected between the metal mesh framework (1) and the reinforcing fiber layer (2) through a melt injection process, so that the three form an integrated composite structure; The thickness of the plastic layer on the flow-facing surface of the composite structure board is 2 - 5 mm, and the thickness of the plastic layer on the back flow-facing surface is 0.5 - 2 mm.

[0009] Further, foamed polystyrene material is filled between the metal mesh framework (1) and the fiber layer or in the inner cavity of the composite structure for buffering, heat insulation and weight reduction.

[0010] Further, 5% - 20% of ultraviolet-resistant antioxidant additives are further incorporated into the thermoplastic material.

[0011] Further, a barrier coating is provided between the reinforcing fiber layer (2) and the metal mesh framework (1) to enhance the bonding effect between the fiber and the plastic and prevent the fiber from absorbing water.

[0012] Further, after the composite structure is injection-molded or cast, a weather-resistant coating is sprayed on the surface to further improve the marine environment resistance performance.

[0013] Adopting the above scheme, the present invention has the following advantages: The metal mesh framework (1) provides mechanical restraint for the creep of the plastic, improving the dimensional stability under long-term loads; The surface roughening treatment and multi-layer fiber reinforcement improve the interfacial adhesion and prevent delamination failure; The metal mesh material itself uses a highly corrosion-resistant alloy and is coated with a plastic layer, enhancing the anti-corrosion performance; The application of the foaming material reduces the weight and provides thermal insulation and cushioning; The thermoplastic material can be recycled and reprocessed, realizing environmental protection and sustainability. Brief Description of the Drawings

[0014] Figure 1 : Schematic diagram of the cross-sectional structure of the composite board.

[0015] Figure 2 : Schematic diagram of the three-dimensional composite board structure. Detailed Description of the Invention

[0016] The following will describe the specific embodiments of the present invention in conjunction with the Figure 1 and the Figure 2 drawings to fully disclose and support the technical solutions described in the claims.

[0017] Example: Preparation and performance testing of the composite cross-sectional structure.

[0018] Fabrication and treatment of the metal mesh skeleton: Select galvanized aluminum steel wire with a wire diameter of 2 mm and a mesh hole side length of 30 mm, and weave it into a planar rectangular metal mesh skeleton.

[0019] Place the skeleton in a sandblasting machine, use aluminum oxide sand as the medium, with a spraying pressure of 0.5 MPa and a sandblasting time of 5 minutes, so that the surface of the skeleton reaches a roughness of Ra = 20 - 50 μm.

[0020] Laying of the reinforcing fiber layer: Lay a layer of fiberglass cloth (fiber diameter ≈ 10 μm, grammage 200 g / m²) on both sides of the roughened skeleton respectively, with the fiber direction arranged at a cross of 45° to ensure the mechanical properties of the composite material in all directions.

[0021] Plastic injection molding: Place the combined skeleton and fiber in a horizontal closed mold, heat it to 200 °C, then inject polyethylene (PE) melt, with an injection pressure of 5 MPa, hold the pressure for 30 seconds, and demold after cooling to 50 °C to obtain a composite board with a total thickness of about 4 mm (the plastic layer thickness on the flow-facing side is 3 mm, and the back flow-facing side is 1 mm).

[0022] Performance testing: Creep performance: Apply a constant load of 10 MPa to the sample at room temperature and continuously test for 500 hours, and the measured creep rate is less than 0.05%.

[0023] Corrosion resistance: Place the sample in a neutral salt spray environment and test for 1000 hours, without signs of material delamination, blistering or corrosion.

[0024] Mechanical properties: Through the three-point bending test, the bending modulus of the sample is increased by more than 20%.

[0025] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent transformation or improvement made within the scope of the technical solutions described in the spirit and claims of the present invention shall be covered by the protection scope of the present invention.

Claims

1. An internal structure support structure solution for a ship made of a new type of material: The solution involves a composite board for the internal support structure of a ship's hull, which shares the basic structural feature of a composite of a metal mesh skeleton and a thermoplastic material with the closest prior art. Its distinguishing features are as follows: 1.1 The metal mesh framework is woven from galvanized aluminum steel wire, stainless steel wire or galvanized steel wire, with the wire diameter being 0.5 - 5 mm and the mesh size being 1 - 50 mm; 1.2 The surface of the metal mesh framework is roughened by net throwing or sandblasting, with the roughness Ra being 20 - 50 μm; 1.3 One or more of basalt fiber, glass fiber, Kevlar or carbon fiber are filled in the mesh holes of the metal mesh framework, and are distributed in a non - directional laying or cross - weaving manner; 1.4 Thermoplastic materials such as polyethylene, polypropylene, polyvinyl chloride or polyurethane are injected between the metal mesh framework and the reinforcing fiber through a melt injection process to form an integrated composite structure; 1.5 The thickness of the plastic layer on the upstream surface of the composite structure board is 2 - 5 mm, and the thickness of the plastic layer on the downstream surface is 0.5 - 2 mm.

2. The support structure solution according to claim 1, wherein Expandable polystyrene material is filled between the metal mesh framework and the reinforcing fiber layer or in the inner cavity of the composite structure.

3. The support structure solution according to claim 1, characterized in that 5% - 20% of ultraviolet - resistant and antioxidant additives are incorporated into the thermoplastic material.

4. The support structure solution according to claim 1, characterized in that, An epoxy resin barrier coating with a thickness of 0.05 - 0.2 mm is provided between the surface of the metal mesh framework and the reinforcing fiber layer.

5. The support structure solution according to claim 1, characterized in that, After the composite structure is formed by injection molding or casting, a weather - resistant coating is sprayed on the surface.

6. The support structure solution according to claim 1, characterized in that, The total thickness of the composite structure board is 3.5 - 6 mm.

7. The support structure solution according to claim 1, characterized in that, The mesh shape of the metal mesh framework is rectangular, hexagonal or rhombic, and the fiber layer is a two - way interwoven cloth or a randomly laid felt layer.

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