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Multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam and preparation method thereof

A composite material and fiber-reinforced technology, applied in the direction of roads, tracks, ballast layers, etc., can solve the constraints of operating speed, increase in axle load and transport capacity, peeling damage of the interface between the surface layer and the core material, and decline in service performance and service life and other problems, to achieve good application prospects, improved shear resistance and anti-stripping ability, and long service life.

Pending Publication Date: 2020-11-06
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the manufacturing and service process of traditional composite sandwich components, the interface between the surface layer and the core material is prone to peeling and damage, which seriously restricts its light weight and high strength characteristics.
[0005] At present, there are problems such as quality decline and incomplete anti-corrosion treatment of wooden sleepers erected on railway bridges, which lead to a decline in their service performance and life, which restricts the improvement of operating speed, axle load and transportation volume. Updated mainstream products

Method used

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  • Multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam and preparation method thereof
  • Multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam and preparation method thereof
  • Multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam and preparation method thereof

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Effect test

Embodiment 1

[0035] see figure 1 , this embodiment 1 discloses a multi-axial fiber reinforced pultrusion profile sandwich composite load-bearing beam, including: pultrusion tube core material 1, pultrusion tube sealing material 2, composite material web 5 and composite material panel 6 ; The pultruded tube core material 1 is a rectangular cross-section, and its size can be flexibly adopted according to the actual force of the structure. The outer surface of the pultruded tube core material 1 is wrapped with a winding fiber cloth 3, and is sealed by the pultruded tube sealing material 2; In this embodiment, the sealing material 2 of the pultrusion tube can be sealed with a composite material sheet, or a structural foam block of a certain length can be selected, and the structural foam block is inserted into the two ends of the pultrusion tube core material 1 and fixed. seal.

[0036] There are 3 pultruded tube core materials 1. In other specific examples, the number can be flexibly adopted...

Embodiment 2

[0048] This embodiment discloses a method for preparing a multi-axial fiber reinforced pultruded profile sandwich composite load-bearing beam, including the following steps:

[0049] S1. Seal both ends of the pultrusion tube core material 1 with a pultrusion tube sealing material 2 .

[0050] S2. Lay 2 layers of winding fiber cloth 3 with an angle of 45° / -45° on the outer surface material of the sealed pultruded tube core 1 .

[0051] S3. Assemble the pultruded tube core material 1 in step S2. The pultruded tube core material 1 has 1 row, 3 pieces in each row, and is stacked horizontally to form a composite member in the shape of a beam.

[0052] S4. Laying four layers of outsourcing fiber cloth 4 on the outer surface of the composite member; the angle of the two layers of laying near the outer surface of the composite member is 45° / -45° and outsourcing along the width direction of the beam, and the angle of the two layers of laying on the outside 0° / 90° and wraps along the l...

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Abstract

The invention discloses a multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam and a preparation method. The multi-axial fiber reinforced pultrusion profile sandwich composite material bearing beam comprises a pultrusion pipe core material, a pultrusion pipe sealing material, a composite material web and a composite material panel, the pultrusion pipe core material has a rectangular section, and the outer surface of the pultrusion pipe core material is wound with winding fiber cloth and sealed by a pultrusion pipe sealing material; a plurality of pultrusionpipe core materials are arranged, the pultrusion pipe core materials are spliced and stacked to form a combined component in a beam shape, and the surface of the combined component formed by splicingand stacking the pultrusion pipe core materials is wrapped by wrapping fiber cloth. Resin is poured into the mold through a vacuum bag forming process, so that the panel, the web and the core materialare integrally formed at a time; the composite sandwich structure is adopted, the pultrusion profile is used as a core material, the composite is used as a surface layer and a web plate, and the advantages of the pultrusion profile and the composite sandwich structure are fully utilized, so that the compression resistance, the bending resistance, the shearing resistance and the stripping resistance of the component are remarkably improved, and the problems of low bearing capacity and interface stripping are solved.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a load-bearing beam of multi-axial fiber reinforced pultrusion profile sandwich composite material and a preparation method thereof. Background technique [0002] Composite materials are widely used in infrastructure fields due to their light weight and high strength properties. At present, bridges (especially suspension bridges that are particularly sensitive to weight) have proposed the concept of composite load-bearing beams in order to reduce structural weight. [0003] Glass fiber reinforced composites (GFRP) are widely used in the infrastructure field due to their low price advantage. Pultruded hollow profiles are often used, but pultruded profiles are usually dominated by longitudinal fibers, and the gap between the panel and the web There is a large shear force and stress concentration at the junction, and it is very easy to split and fail in the middle of the face pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01B3/46B29C70/34
CPCE01B3/46B29C70/34
Inventor 方海王蕴天韩娟霍瑞丽杨晨蔡炜
Owner NANJING UNIV OF TECH