摘要:
The invention relates to a wheel, which comprises a rim having a rim well and rim flanges, a hub, and at least three spoke elements. Each spoke element forms at least one spoke between the hub and the rim. The spoke elements are fastened to the inside of the rim in a form-closed manner or a form-closed and bonded manner. The invention is characterized in that, in the hub region, the spoke elements are supported on each other in the circumferential direction at abutting surfaces designed therefor. The invention further relates to a method for producing the wheel according to the invention.
摘要:
A positioning member (11) for a tubular (10) is formed using a prefabricated fiber-reinforced resin shell (1) positioned upon a surface of the tubular and bonded to provide a protrusion upon the surface of the tubular. In a disclosed method a fiber-reinforced resin shell (1) is secured to an external surface of a tubular (10) thereby enclosing a cavity between the shell (1) and the surface of the tubular (10); a bonding agent is introduced through inlet ports (5) in a surface of the fiber-reinforced resin shell (1) to fill a cavity between the shell (1) and the surface of the tubular (10), and the bonding agent is cured.
摘要:
This invention relates to a process of making a fiber-reinforced composite. Glass fibers may be provided. These glass fibers may be treated with a sizing composition that has a coupling-activator compound with the formula: S-X-(A)n, where S represents a silicon-containing coupling moiety capable of bonding to the surface of glass fibers, X represents a linking moiety, and (A) n represents one or more polymerization activator moieties. The treated glass fibers may be combined with a resin to make a fiber-resin mixture. The resin may have a monomer, a catalyst, and an activator compound capable of initiating a polymerization of the monomer. The monomer may be a lactam or lactone having 3-12 carbon atoms in the main ring. The fiber-resin mixture may then be cured so that the monomer polymerizes to form a thermoplastic polymer matrix of the fiber-reinforced composite. The thermoplastic polymer matrix may be formed by in situ polymerization initiated from both the surface of the glass fibers and the resin. The fiber-reinforced composite formed may be at least 70 wt.% glass fiber.
摘要:
A carbon-fiber-reinforced plastic prepared by impregnating a matrix resin into a sheet-like base material composed of discontinuous carbon fibers, wherein the content ratio of carbon fibers having lengths of 10 mm or longer in the sheet-like base material is 60 wt% or more relative to the total amount of the carbon fibers, and the average value of the orientation degrees of the carbon fibers contained in the base material is in a range of 2-10; and a process for producing the carbon-fiber-reinforced plastic, wherein the formation of the sheet-like base material is performed by carding. At the stage of the sheet-like base material which is not impregnated yet, adequate anisotropy is intentionally imparted to the discontinuous carbon fibers in such a manner that the average value of the orientation degrees of the discontinuous carbon fibers falls within a predetermined range. Therefore, it becomes possible to produce a carbon-fiber-reinforced plastic excellent in mechanical properties using a smaller amount of the carbon fibers while maintaining the shape formability of the sheet-like base material and the moldability into the carbon-fiber-reinforced plastic satisfactorily.
摘要:
An improved process for making fiber reinforced epoxy plastic structure by a process that includes the steps of : forming a structure of the reinforcing fibers (14) an epoxyresin composition (15) that includes a liquid epoxy resin and an epoxy resin hardener; and heating the structure to cure the epoxy resin composition. The epoxy resin composition including more than one and one half percent of mono hydrolyzed epoxy resin and an epoxy resin hardener so that the viscosity of the epoxy resin composition during the heating step is in a range that results in a degree of impregnation of the void space between the reinforcing fibers by the cured epoxy resin composition that is greater than ninety volume percent of the void space.
摘要:
The invention relates to glass filaments which are intended for reinforcing polymeric materials and which are coated with a sizing composition comprising, as adhesive film-forming agents, a mixture of at least one polyvinyl acetate and at least one polyvinylpyrrolidone, said at least one polyvinyl acetate representing 70% to 90% by weight of the solids of the size. The resulting glass filaments are used as reinforcements in the production of mouldings having a thermosetting matrix that are obtained by simultaneous spraying of said filaments and resin, in particular by LFI (Long Fibre Injection) moulding.
摘要:
A composite having fibers of relatively high elastic modulus embedded in a matrix of relatively low elastic modulus is provided with an interphase of elastic modulus less than the matrix modulus and cohesive energy higher than the matrix cohesive energy. The resulting composite has enhanced strength and toughness.