Structure and method for enhancing shearing intensity of composite material pipe joint by long and thin lever of composite material
A technology for reinforcing composite materials and composite materials, which is applied in the structural field of composite material slender rods to strengthen the shear strength of composite material pipeline joints, and can solve the problems of destroying the continuity of reinforced fibers, lack of reinforcement materials in pipelines, and shear failure at joints, etc. , to achieve the effect of resistance to shear damage, cheap price, and firm connection
Active Publication Date: 2009-08-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology
At present, mechanical connections are mostly used for the connection of composite material pipes, mainly threaded connections. Since the thread processing at the joints destroys the continuity of the original reinforcing fibers and the radial direction of the pipes lacks reinforcing materials, this makes the joints of the pipes prone to shearing. cutting failure, which has become an important obstacle to limit the further application of composite pipes
Three-dimensional weaving technology and sewing technology are both three-dimensional reinforced composite materials technology, which can enhance the shear strength of composite pipe joints, but their complex technology and high cost limit the application of these two technologies
Method used
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[0020] The joint part of the composite material pipe with an outer diameter of 500mm and a wall thickness of 20mm is threaded, and the length of the pipe joint area is 100mm. A 0.5mm diameter composite material slender rod is used to enhance the shear strength of the pipe joint, and the thickness of the foam is 10mm.
[0021] Step 1: Cut the slender rod of composite material into short rods with a length of 30mm, and cut the foam into two rectangles with a length of 1600mm and a width of 110mm;
[0022] Step 2: Insert the chopped composite slender rods vertically into the foam, the composite slender rods have a row spacing of 5 mm and a column spacing of 3 mm;
[0023] Step 3: Heat the wet-wound composite pipe mandrel with hot steam until the resin is in a gel state;
[0024] Step 4: Wrap two foam inserts with chopped composite slender rods around the connection area at both ends of the composite pipe, with the foam sidewalls aligned with the pipe ports;
[0025] Step 5: Use...
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Abstract
The invention relates to a structure which uses a composite material slender rod to strengthen shear strength of a composite material conduit joint and a method thereof, belonging to the technical field of composite material enhancement. The structure of the invention is characterized in that the composite material slender rod is embedded in the composite material conduit joint along the circumferencial direction. The method of the invention is characterized in comprising the following steps: first, the composite material slender rod is vertically inserted into foam; secondly, the wound composite material conduit by the wet method is heated and solidified to gel state; thirdly, the composite material slender rod on the foam is inserted into the composite material conduit in the gel state by an ultrasonic hammer; finally, the composite material conduit is completely solidified by heating. The structure and the method of the invention can noticeably improve shear strength of the joint area of the composite material conduit and the quality of the composite material conduit and lengthen service life thereof; meanwhile the structure and the method of the invention has the advantages of simple equipment and technique, low cost and high efficiency.
Description
technical field [0001] The invention relates to a structure and a method for enhancing the shear strength of composite material pipeline joints by composite material slender rods, and belongs to the technical field of composite material reinforcement. Background technique [0002] Composite pipes are mostly produced by wet winding. The products have the advantages of excellent in-plane mechanical properties, low cost, high production efficiency and excellent corrosion resistance. They are widely used in various liquid transportation fields, especially in water supply and drainage, chemical industry and oil fields. Oil pipeline field. At present, mechanical connections are mostly used for the connection of composite material pipes, mainly threaded connections. Since the thread processing at the joints destroys the continuity of the original reinforcing fibers and the radial direction of the pipes lacks reinforcing materials, this makes the joints of the pipes prone to shearin...
Claims
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IPC IPC(8): F16L15/00B29C70/82
Inventor 李勇肖军谭永刚程培忠孙涛
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS