Provided are: a bond construction of an FRP material to a structure characterized in that a bonding layer formed from a fibrous substrate and a resin is interposed between the structure and the FRP material, and the bonding layer is protruded from an edge of the FRP material; and a bonding method. Repair or reinforcement of an existing structure can be made easily and reliably at a construction site with a required FRP material, and in particular, a sufficiently strong bonding force can be exerted between the structure and the FRP material for repair or reinforcement and a targeted repair or reinforcement performance due to the FRP material can be exhibited for the structure more reliably.

In a preform shaping method, a fiber stack is manufactured by stacking a sheet-form fibrous component, at least one of a subsidiary material and a component part that have flexibility is placed on the fiber sack, and a preform that has a shaped configuration is manufactured by pressing and pressurizing, against a mold, the fiber stack provided with the at least one of the subsidiary material or the component part.

A system for forming a composite component includes a close mold tool defining a cavity that corresponds to a shape of the composite component and configured to receive a composite material. The system further includes a perforated release film defining a plurality of openings and configured to be positioned on a surface of the composite material within the cavity. The system further includes a breather configured to be positioned on the perforated release film, to allow a vacuum to be applied to the composite material through the breather and the plurality of openings, and to allow pressurized fluid to be applied to the perforated release film through the breather.

The present invention relates to a method of manufacturing a wind turbine blade using a two-step curing process, wherein the second curing is performed in the presence of a resin flow medium (76) comprising a curing inhibitor.

Methods of manufacturing composite sandwich components (100) and composite sandwich components overcome drawbacks in the prior art. For example, the large number of resin filled perforations that are unavoidable when manufacturing prior art composite sandwich components is avoided.

A flow aid for an infusion structure for infiltrating fiber material with resin to produce a fiber composite component includes a resin-impermeable upper layer and a lower layer which are joined together in a peripheral region of the flow aid and provide a flow space between the two layers. The lower layer provides an outlet for discharging resin out of the flow aid into an interior of the infusion structure. The flow aid includes an inlet for feeding the resin into the flow space, thereby facilitating uniform distribution of the resin over all of the fiber material.

A system for manufacturing a composite article includes a resin-wetting control layer configured to be placed in contact with a composite ply of a composite preform. The resin-wetting control layer is configured complementary to a ply surface of the composite ply.

A method of making an elongate wind turbine blade is described. The wind turbine blade extends longitudinally between a root end and a tip end in a spanwise direction, and the method comprises: (a) providing an elongate mould tool (20) extending longitudinally in a spanwise direction; (b) arranging an elongate spar structure (40) in the mould tool, the spar structure (40) N extending longitudinally in the spanwise direction; (c) arranging core material (24) adjacent to the spar structure (40); (d) providing resin-permeable material (114) between the spar structure (40) and the core material (24); and (e) administering resin into the mould during a resin infusion process. The resin-permeable material (114) restricts the flow of resin between the spar structure (40) and the core material (24) in the spanwise direction and thereby substantially prevents lock-offs from forming during the infusion process.

A method for manufacturing a rotor blade root assembly includes placing outer skin layer(s) onto a blade mold and arranging a root plate with a plurality of through holes adjacent to an end face of the blade mold. The method also includes placing a plurality of root inserts atop the outer skin layer(s) and abutting against the root plate, with each of the root inserts defining a fastener hole. The method also includes inserting a root fastener into each of the aligned through holes and longitudinal fastener holes. Moreover, the method includes placing inner skin layer(s) atop the root inserts. Further, the root plate may include at least one fluid hole configured therethrough to provide a non-gas tight root plate. Alternatively, at least one seal may be arranged between the root plate and the blade mold that forms a non-gas tight connection with either or both of the root plate or the blade mold during a vacuum infusion process. Thus, the method includes securing the outer skin layer(s), the root inserts, the inner skin layer(s), and the root fasteners together to form the root assembly via the vacuum infusion process.

A reinforcing structure for a wind turbine blade A reinforcing structure for a wind turbine blade (12) is described. The reinforcing structure comprises one or more pultruded strips (42C) having spanwise grooves (54). The grooves (54) impart transverse flexibility to the strips (42C), allowing the strips (42C) to conform to the curvature of a wind turbine blade mould (44). An associated method of making a reinforcing structure for a wind turbine blade (12) is described. The method comprises providing an elongate mould (44) extending in a longitudinal direction and defining a mould surface at least part of which is concave-curved in transverse cross section. One or more pultruded strips (42C) with spanwise grooves (54) are arranged in the mould (44) to form the reinforcing structure. The pultruded strip(s) are bent along the grooves (54) so that they substantially conform to the transverse curvature of the mould surface. In preferred embodiments the reinforcing structure is a spar cap (36)