A rotor blade for a wind turbine includes a first blade segment and a second blade segment extending in opposite directions from a chord-wise joint. The blade segments each have at least one shell member defining an airfoil surface and an internal support structure. The internal support structure of the first blade segment includes a beam structure that structurally connects with the internal support structure of the second blade segment via a receiving section. The rotor blade further includes one or more pin joints positioned on at least one of internal support structures of the blade segments. Further, at least one of internal support structures is constructed, at least in part, of a resin material having a plurality of fibers cured therein. The fibers are arranged with varying fiber orientations along a span of the rotor blade at locations of the pin joint(s).

Provided are a molded body and a method for manufacturing a molded body, the molded body comprising: reinforced fibers having a weight average fiber length of 1 mm or more and 100 mm or less: and a thermoplastic resin, wherein the molded body is provided with a first main shape surface part, a second main shape surface part connected to the first main shape surface part in a crossing state, and a connection surface part connected to both the first main shape surface part and the second main shape surface part, the connection surface part protrudes from the first main shape surface part and the second main shape surface part on a valley side formed by the first main shape surface part and the second main shape surface part, and reinforced fibers are continuously dispersed in an in-plane direction at a boundary region between the first main shape surface part and the connection surface part and a boundary region between the second main shape surface part and the connection surface part.

In one embodiment, a method includes fastening a plurality of components of a composite structure in an assembly fixture, wherein the assembly fixture comprises a plurality of strands of a fiber-reinforced thermoplastic material, wherein the fiber-reinforced thermoplastic material comprises a thermoplastic embedded with a plurality of reinforcement fibers, wherein the plurality of reinforcement fibers is aligned within each strand of the plurality of strands, and wherein the assembly fixture further comprises an anisotropic thermal expansion property based on an orientation of the plurality of reinforcement fibers within the assembly fixture; and heating the assembly fixture in an autoclave to bond the plurality of components of the composite structure.

An injection mold including a gate and a cavity, where a weld portion is formed inside the cavity by injecting molten resin containing reinforcing fibers from the gate into the cavity, the injection mold has a resin reservoir open to the cavity, and in a first cross section along an opening end surface 110S of the resin reservoir 110 to the cavity, a distance CLD between a width center line CL11 of the resin reservoir and a width center line of the cavity, which is measured along a perpendicular line n12 of the width center line CL12 of the cavity, changes at least in part along the width center line of the cavity.

In one embodiment, an assembly fixture may include a base structure including a plurality of strands of a fiber-reinforced thermoplastic material comprising a thermoplastic embedded with a plurality of reinforcement fibers, wherein the plurality of reinforcement fibers is aligned within each strand of the plurality of strands, and wherein the base structure further comprises an anisotropic thermal expansion property based on an orientation of the plurality of reinforcement fibers within the base structure, The assembly fixture may further include a plurality of fastening structures coupled to the base structure, wherein the plurality of fastening structures is configured to fasten a plurality of components of a composite structure for assembly using a heated bonding process.

Some embodiments of a compression mold for forming a rib-and-sheet part includes a mold cavity and a mold insert. A sheet is placed in the mold cavity, and the mold insert is placed on the sheet. A preform assemblage is placed in a gap that is formed between the mold insert and the wall of the mold cavity. A mold core is biased above the preform assemblage, prior to molding operations, via a compression spring.

A resin formed body obtained from a resin composition that contains a polypropylene resin and a cellulose fiber, the polypropylene resin partially containing an acid modified polypropylene resin, wherein the resin formed body has a diffraction peak derived from a polypropylene α-crystal (040) plane at a position of a scattering vector s of 1.92±0.1 nm.sup.−1, a diffraction peak derived from a polypropylene β-crystal (300) plane at a position of a scattering vector s of 1.83±0.1 nm.sup.−1, and a diffraction peak derived from a cellulose I.sub.β type crystal (004) plane at a position of a scattering vector s of 3.86±0.1 nm.sup.−1, observed in a wide-angle X-ray diffraction measurement, and wherein an orientation degree of the cellulose fiber in the resin formed body is larger than 0.1 and less than 0.8.

Interlaminar features of a composite structure are laid up by placing and steering individual chopped fiber pre-preg segments onto a substrate.

A mold for resin impregnation molding includes an accommodating portion which is able to accommodate a container body around which a fiber bundle is wound, a storage portion which is able to store an uncured resin having fluidity, a flow path which causes the resin to flow from the storage portion to the accommodating portion, and a pressure control unit which controls a pressure which causes the resin stored in the storage portion to flow through the flow path to the accommodating portion.

A fiber-reinforced resin shaped product includes: reinforcing fibers with a weight average fiber length of 100 mm or less; and a thermoplastic resin. The fiber-reinforced resin shaped product has grains on at least a part of a surface thereof. A maximum height (Rz) of the grains is 100 m to 200 m, and an average pitch (Rsm) between adjacent grains is 1100 m or less.