49 results about "Carbon fiber reinforced polymer" patented technology

The cut laminate edges of aircraft fuel tanks formed of carbon fiber reinforced polymers are sealed to prevent the exposure of carbon fibers to combustible fuel. The edge seal is produced from a prepreg form using a thermosetting resin matched to the characteristics of the resin used in the laminate. The prepreg form can be applied to the cut laminate edges either before or after the laminate is cured. The edge seal acts a dielectric layer that both electrically insulates the cut laminate edges from the fuel and mechanically contains energetic particles produced at the edges due to lighting strikes or other sources of electrical charges.

Application of carbon fiber reinforced polymer structures to metal vehicle wheels is effective in reducing the mass of the wheel while retaining suitable stiffness in the wheel structure. For maximum effect the reinforced polymer structure and the metal wheel must operate cooperatively. Because of the wide range of operating temperatures experienced by wheels and the large difference in coefficient of thermal expansion between metals and carbon fiber reinforced composites attachment of the polymer structure to the wheel by adhesive alone is problematical. However a wheel with an effective and durable reinforcement may be fabricated by confining, through mechanical interference, the reinforced polymer in a cavity in or on the spoke and by preheating the wheel before curing the polymer.

The invention discloses a method for testing interface bond behavior of CFRP (carbon fiber reinforced polymer) cloth-concrete based on a beam specimen. The method comprises three steps of preparing a test specimen, arranging a test point and loading a test. The test specimen manufactured in the first step is the beam specimen and comprise two concrete test blocks, which are arranged at left and right and symmetric in shape; the two concrete test blocks are inverted T-shaped concrete test blocks; the upper parts in the middle of the two concrete test blocks are connected by a steel hinge; the steel hinge is divided into left and right halves; and the left and right halves are respectively adhered to the concrete test block at the corresponding side, and have the rotation ability. Compared with the traditional double shear test method for testing the interface bond behavior of the CFRP cloth-concrete, the effect of asymmetric loading on the data reliability is avoided; the method has a unique advantage of high accuracy of the test result; and the accuracy and the creditability of the detection result are improved.

A test apparatus used for simulating debonding between a carbon fiber reinforced polymer (CFRP) and concrete in a CFRP-strengthened structure consists of a primary structural block, a secondary structural block, an adjustable hanger, a receiving slot, an attachment mechanism, a pull-off disk, a connecting plate having a plurality of rods. The adjustable hanger and the secondary structural block are slidably positioned into the receiving slot that traverses into a structural body of the primary structural block. The adjustable hanger is mainly used during double-shearing tests and mixed-mode tests, wherein both shearing and peeling is analyzed in mixed-mode tests. The secondary structural block is used in double-shear tests, mixed-mode tests, single-shear tests, tension pull-off tests, and beam-bend tests. The attachment mechanism, which holds the primary structural block, the secondary structural block, and the adjustable hanger together, is also used during single-shear tests and beam-bend tests.

The invention discloses a method for preparing a high thermal conductivity chopped carbon fiber reinforced polymer-based resistance welding unit. The method comprises the following steps of: mixing graphene micro tablets and chopped carbon fiber in water with ultrasonic dispersion and adding a surfactant for uniformly mixing after drying; placing the mixture and thermoplastic resin to an internal mixer for mixing and pressing into a sheet in a die; and placing the sheet in a die the length of which is larger than that of the sheet, respectively adding a conducting material in clearances of both ends of the sheet and the end of the die, performing hot pressing, and grinding both ends of the sheet after demoulding so that the conducting material is exposed outside to be used as an energized electrode of the welding unit. The method is simple in preparation process, high thermal conductivity graphene micro tablets are adopted, phenomena of overburning and overshooting existing in resistance welding are avoided so that a weld is uniformly heated, the mechanical property and the conductive property of the welding unit are improved due to that the carbon fiber is added, and the resistance value of a weld assembly is at 102-101 orders of magnitude.

The invention discloses a method for recovery of carbon fiber from a thermosetting polymer based carbon fiber reinforced polymer material by use of a unitary, binary composite or ternary composite low temperature molten salt system (melting range: 100-400 DEG C). A composite molten salt is prepared in a certain proportion, and then is heated to melt, a carbon fiber reinforced polymer material is added into the composite molten salt for heating until the carbon fiber is separated, the carbon fiber is dragged out and put into water for cleaning, the carbon fiber suspends in the upper layer of the solution, and polymer degradation matters sink to the bottom. The method is simple in process and easy to control, and has no need of large and special instrument equipment, no toxic and harmful gas emissions in a treatment process, and no waste liquids and other secondary pollution after treatment, the carbon fiber is easy to separate, and at the same time inorganic salts dissolved in the water can be recovered and recycled, so that the method has economic, efficient, green and other advantages.

A computer system is provided for processing ultrasonic data of an ultrasonic probe applied to an area of an aircraft component that includes carbon fiber reinforced polymer. C-scan data is obtained and a preliminary mesh is defined over the C-scan data by taking into account the underlying structural or mechanical characteristics of the analyzed component. The mesh is further refined and data gathered for each mesh cell. A heat map is generated based on the mesh.

A storage tank for pressurized gas includes a liner defining an interior cavity for storing the pressurized gas. The storage tank further includes a nanoporous carbon shell formed from at least one pyrolyzed polymer. The liner is disposed at an inner side of the nanoporous carbon shell. The storage tank further includes a carbon fiber reinforced polymer layer disposed on an outer side of the nanoporous carbon shell opposite from the liner. The nanoporous carbon shell has an exposed surface at an exterior of the storage tank and is configured to permit gas permeated through the liner from the interior cavity to diffuse through the nanoporous carbon shell to the exposed surface.

The invention provides a carbon fiber surface grafted two-dimensional network structure reinforced polyether-ether-ketone composite material and a preparation method thereof, and belongs to the technical field of carbon fiber reinforced polymer matrix composite materials. The carbon fiber surface is functionalized (grafted with amino) by diazotization reaction, and active functional groups are introduced into the surface of the carbon fiber on the premise of not damaging the strength and integrity of the carbon fiber, so that the polarity and activity of the carbon fiber surface are improved;and then silicon dioxide nanowires and aminated graphene are grafted on the surface of the carbon fiber through covalent bond action to form the carbon fiber containing a two-dimensional interpenetrating network structure, so that the surface polarity and roughness of the carbon fiber are improved, the interface strength of the CF/PEEK composite material can be improved, and the problem of infirmcombination of the nano particles and the surface of the fiber is solved.

Carbon-fiber-reinforced polymers are composite materials. In this case the composite consists of two parts; a matrix and a reinforcement. In CFRP the reinforcement is carbon fiber, which provides the strength. The matrix is usually a polymer resin, such as epoxy, to bind the reinforcements together. Because CFRP consists of two distinct elements, the material properties depend on these two elements. In accordance with one aspect of the invention, there is provided a method and apparatus for producing carbon-fiber-reinforced polymers, wherein the polymer resin used in their manufacture is additionally reinforced by unidirectionally oriented pre-dispersed alumina nanofibers. The aforesaid process is well suited for industrial-scale production of the carbon-fiber-reinforced polymers. In one or more embodiments, the production process involves dispersing alumina nanofibers in the polymer resin, such as epoxy, and using the resulting alumina nanofiber-reinforced polymer resin in the production of the carbon-fiber-reinforced polymers.

The invention discloses a thermal imaging defect detection method based on convolution auto-encoder image amplification. The method comprises the following steps: 1, obtaining a thermal image and thermal image data of a carbon fiber reinforced polymer composite material; 2, selecting and processing the thermal image; 3, establishing a convolutional auto-encoder image enhancement model, and carrying out noise reduction on the thermal image; 4, preprocessing the thermal image data; 5, establishing a Laplau feature mapping thermal imaging model based on the experimental thermal image and the convolutional auto-encoder reconstructed thermal image, extracting defect information in the thermal image and visualizing the defect information to realize qualitative monitoring of the defect; and 6, evaluating the established model by adopting a separation degree index, and verifying the effect of the image enhancement strategy in defect detection modeling.

A method for promoting electrical conduction between metallic components and composite materials. A composite body is coated with an adhering layer comprising a conductive material, and a metallic component is electrically connected to the conductive material of the adhering layer, when the metallic component is coupled to the composite body. The adhering layer is deposited inside a hole in the composite body, and/or along an edge of the hole, and/or on at least a portion of a surface of the composite body. The composite body is a structure of an aircraft or other vehicle comprised of composite materials formed from carbon fiber-reinforced polymers (CFRPs), the metallic component is a fastener or is positioned at an interface between the fastener and the composite body, and the electrical connection is made as part of a lightning protection system, an electromagnetic effects (EME) management system, or grounding system.

The invention provides a carbon fiber reinforced polymer matrix reinforced board and a preparing method thereof and belongs to the technical field of automobile internal decorating materials. The board is formed in the mode that short-cut carbon fiber is mixed with polymer, and methods of felt making of fiber mixing, lamination of carbon fiber cloth and polymer film and lamination of carbon fiber felt and polymer film are adopted to prepare preforming parts respectively. Then, through a compound forging forming technology, the preforming parts are subjected to pressing forming, and a carbon fiber reinforced composite material of high performance is prepared. The carbon fiber reinforced polymer matrix reinforced board meets requirements of mass and assembly line production, lowers cost, improves production efficiency, and promotes large-scale industrialization application of the carbon fiber composite material.

A lightning damage assessment method for the carbon fiber reinforced polymer (CFRP) material considering non-linear impedance characteristic includes steps of: studying various influencing factors of the lightning damage of the CFRP material under the action of the single lightning current component; obtaining the law between the lightning damage of the CFRP material, including the lightning damage area and depth, and various influencing factors, including the peak value, the rising rate, the charge transfer amount, the specific energy of the single lightning current component, and the non-linear impedance characteristic of the CFRP; on the basis of the law, building the multi-factor assessment model of the lightning damage of CFRP material under the action of the single lightning current component; and obtaining mathematical expressions between the lightning damage of the CFRP material and the influencing factors.

The invention discloses a continuous carbon fiber FDM 3D printing forming method which comprises the following steps that rotatable wire coils are wound with a continuous carbon fiber filament reinforcing material and a thermoplastic plastic filament base material respectively; the two wire coils are placed in a common air blast drying box for drying; a forming chamber and a printing platform of an FDM printing system and a melting cavity and a nozzle of an extruder are heated; and the continuous carbon fiber filament reinforcing material and the thermoplastic plastic filament base material are sent to the printing system according to program settings for printing forming. By using the continuous carbon fiber FDM 3D printing forming method, a complex-shaped part printed by combining with a continuous carbon fiber reinforced polymer composite has excellent high temperature resistance and chemical resistance, so that a light high-strength 3D printing carbon fiber composite part can be manufactured, and a set of process technology with reference significance is provided for the forming process aspect of high-performance complex structural parts in China.

The invention discloses a CFRP-embedded-anode reinforcing-steel-bar-concrete cathode protection method and device. The reinforcing-steel-bar-concrete cathode protection device comprises concrete, plural reinforcing steel bars, a direct-current power source and a CFRP anode; the CFRP anode comprises plural carbon fiber reinforced polymer bars (CFRP), and the CFRP bars and reinforcing steel bars are parallelly embedded into the concrete; the plural CFRP bars are connected with the anode of the direct-current power source in parallel, and the reinforcing steel bars are parallel and connected with the cathode of the direct-current power source. The CFRP-embedded-anode reinforcing-steel-bar-concrete cathode protection method and device are convenient to construct, the bonding strength between an anode material and concrete is high, the resistance between the cathode and the anode is small, and the engineering cost and the cost for protecting a circuit to be normally used are reduced.

The invention discloses a concrete filled steel tube inner support. The concrete filled steel tube inner support comprises a supporting plate, a supporting pipe is fixedly connected to the middle endof the top of the supporting plate, and the inner side of the supporting pipe is coated with JS waterproof paint. Meanwhile, the inner side of the JS waterproof paint is coated with an epoxy coal pitch coating, the outer side of the supporting pipe and the outer side of the supporting plate are both coated with iron oxide red phenolic aldehyde antirust coatings, and the outer sides of the iron oxide red phenolic aldehyde antirust coatings are coated with carbon fiber reinforced polymers CFRP. The supporting pipe is arranged, and people can pour concrete into the supporting pipe, so that the overall supporting strength of the supporting piece is effectively improved; the carbon fiber reinforced polymers CFRP are arranged, the overall strength of the supporting pipe and the supporting platecan be improved, and the overall rust resistance of the supporting pipe and the supporting plate can be improved through the iron red phenolic aldehyde antirust coatings; the epoxy coal tar pitch coating is arranged, and the corrosion resistance of the inner side of the supporting pipe can be improved; and the JS waterproof coating is arranged, the waterproofness of the inner side of the supporting pipe is improved, and therefore the service life of the whole supporting piece is prolonged.

The invention discloses a continuous carbon fiber FDM 3D printing method for thighs of a quadruped robot. The 3D printing method comprises the following steps of: carrying out split structure optimization and redesign optimization on a design of the thighs of the quadruped robot according to the characteristics of a 3D printing technology, and respectively obtaining a model A and a model B. In the continuous carbon fiber FDM 3D printing method for the thighs of the quadruped robot, a complex-shaped part printed by investing the continuous carbon fiber FDM 3D printing method for the thighs of the quadruped robot and combining with a continuous carbon fiber reinforced polymer composite has the characteristics of light weight and high strength and has excellent high temperature resistance and chemical resistance; and by adopting the 3D printing technology, continuous carbon fiber 3D printing forming manufacturing of legs and feet of the quadruped robot is firstly achieved, continuous carbon fiber 3D printing forming manufacturing of a quadruped robot body and overall components thereof is gradually achieved, and the method has an important significance of development of light weight and high bearing ratio of the quadruped robot.

The invention provides a modified carbon fiber reinforced polymer-based composite material, and belongs to the field of composite materials. According to the invention, the oxidized carbon fiber is encapsulated by using the biomass polymer to obtain the modified carbon fiber OCFs-CS, and the interlaminar shear strength of the carbon fiber composite material prepared by compounding the OCFs-CS as the reinforcing fiber and the resin matrix is greatly improved, and the carbon fiber composite material has excellent mechanical strength. According to the preparation method disclosed by the invention, carbon nanotubes are further grafted on OCFs-CS to obtain modified carbon fibers OCFs-CS-CNTs, and the mechanical strength of the carbon fiber composite material prepared by compounding the OCFs-CS-CNTs serving as reinforced fibers and a resin matrix is further improved. The modified carbon fiber reinforced polymer-based composite material disclosed by the invention has excellent interface performance and mechanical strength, and has a wide application prospect in the fields of aerospace, transportation tools, energy equipment and the like.

A method of recycling fiber reinforced polymers includes grinding used fiber reinforced polymers material to produce ground particles, functionalizing the ground particles to produce functionalized particles, dispersing the functionalized particles into a base resin, dispensing the resin with functionalized particles into one or more layers of continuous fiber mats, molding the resin with functionalized particles and the continuous fiber mats into a form of a desired part, and curing the form to produce the part. The used fiber reinforced polymer materials may be carbon fiber reinforced polymers or glass fiber reinforced polymer materials.

The invention discloses an anti-torsion bearing disc in badminton shoes and a production method thereof. The excellent properties of an amorphous alloy material including high strength, high elasticity and high toughness are ingeniously applied, the amorphous alloy material is prepared into sheets, belts or threads for improving the performance of the anti-torsion bearing disc in badminton shoes, and meanwhile, an optimized surface treatment process is adopted, so that a novel amorphous alloy/carbon fiber reinforced polymer-based composite material with comprehensively improved toughness is prepared, and the defects that a carbon fiber anti-torsion bearing disc is easy to twist and deform, easy to bend and fracture, poor in interlayer fracture toughness and insufficient in elasticity are overcome.

Due to the fact that a carbon fiber reinforced polymer composite (CFRP) has the beneficial effects of being high in specific strength, high in specific modulus, light, durable and the like, the carbon fiber reinforced polymer composite (CFRP) becomes an ideal use material in the field of aerospace. Machining defects such as layering, burrs, fiber tearing and hole wall scratching are quite likely to be generated in the CFRP hole making process and seriously influence the strength and the fatigue life of CFRP connection structures. Layering is mainly caused by the fact that the axial force of holes is larger than the interlayer bonding force of CFRP plates during hole machining. The burrs and tearing are mainly caused by obtuse cutting edges of blades. The hole scratching is mainly caused by the interaction between rear cutter faces of tools, cuttings and hole walls. Thus, a welded type blade used for CFRP drilling machining is designed and used for reducing the defects in the CFRP machining process. The blade mainly comprises a blade body 1, a main cutting edge 2, a main front cutter face 3, a first main rear cutter face 4, a second main rear cutter face 5, a first auxiliary cutting edge 6, an auxiliary front cutter face 7, a second auxiliary cutting edge 8, a first auxiliary rear cutter face 9 and a second auxiliary rear cutter face 10.

An assembly for a vehicle having reduced galvanic corrosion includes a first component defining at least one interface region that includes a carbon-fiber reinforced polymeric composite (CFRP) and a first material present in the at least one interface region and having a first electrochemical potential. A second component has a second material and is in contact with the at least one interface region of the first component. The second material has a second electrochemical potential different than the first electrochemical potential. In this manner, in the presence of an electrolyte the first material may be either less noble than the second material and serve as a sacrificial material or alternatively more noble to the second material reducing a driving force for corrosion. Methods of reducing galvanic corrosion in an assembly (e.g., for a vehicle) are also provided.